* [PATCH v12 05/25] net: Prepare UDS for security module stacking
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
` (9 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, netdev
Change the data used in UDS SO_PEERSEC processing from a
secid to a more general struct lsmblob. Update the
security_socket_getpeersec_dgram() interface to use the
lsmblob. There is a small amount of scaffolding code
that will come out when the security_secid_to_secctx()
code is brought in line with the lsmblob.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
include/linux/security.h | 7 +++++--
include/net/af_unix.h | 2 +-
include/net/scm.h | 8 +++++---
net/ipv4/ip_sockglue.c | 8 +++++---
net/unix/af_unix.c | 6 +++---
security/security.c | 18 +++++++++++++++---
6 files changed, 34 insertions(+), 15 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index 322ed9622819..995faba7393f 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1356,7 +1356,8 @@ int security_socket_shutdown(struct socket *sock, int how);
int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb);
int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
int __user *optlen, unsigned len);
-int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid);
+int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
+ struct lsmblob *blob);
int security_sk_alloc(struct sock *sk, int family, gfp_t priority);
void security_sk_free(struct sock *sk);
void security_sk_clone(const struct sock *sk, struct sock *newsk);
@@ -1494,7 +1495,9 @@ static inline int security_socket_getpeersec_stream(struct socket *sock, char __
return -ENOPROTOOPT;
}
-static inline int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
+static inline int security_socket_getpeersec_dgram(struct socket *sock,
+ struct sk_buff *skb,
+ struct lsmblob *blob)
{
return -ENOPROTOOPT;
}
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 3426d6dacc45..933492c08b8c 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -36,7 +36,7 @@ struct unix_skb_parms {
kgid_t gid;
struct scm_fp_list *fp; /* Passed files */
#ifdef CONFIG_SECURITY_NETWORK
- u32 secid; /* Security ID */
+ struct lsmblob lsmblob; /* Security LSM data */
#endif
u32 consumed;
} __randomize_layout;
diff --git a/include/net/scm.h b/include/net/scm.h
index 1ce365f4c256..e2e71c4bf9d0 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -33,7 +33,7 @@ struct scm_cookie {
struct scm_fp_list *fp; /* Passed files */
struct scm_creds creds; /* Skb credentials */
#ifdef CONFIG_SECURITY_NETWORK
- u32 secid; /* Passed security ID */
+ struct lsmblob lsmblob; /* Passed LSM data */
#endif
};
@@ -46,7 +46,7 @@ struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl);
#ifdef CONFIG_SECURITY_NETWORK
static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
{
- security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
+ security_socket_getpeersec_dgram(sock, NULL, &scm->lsmblob);
}
#else
static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
@@ -97,7 +97,9 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
+ /* Scaffolding - it has to be element 0 for now */
+ err = security_secid_to_secctx(scm->lsmblob.secid[0],
+ &secdata, &seclen);
if (!err) {
put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index aa3fd61818c4..6cf57d5ac899 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -130,15 +130,17 @@ static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
+ struct lsmblob lb;
char *secdata;
- u32 seclen, secid;
+ u32 seclen;
int err;
- err = security_socket_getpeersec_dgram(NULL, skb, &secid);
+ err = security_socket_getpeersec_dgram(NULL, skb, &lb);
if (err)
return;
- err = security_secid_to_secctx(secid, &secdata, &seclen);
+ /* Scaffolding - it has to be element 0 */
+ err = security_secid_to_secctx(lb.secid[0], &secdata, &seclen);
if (err)
return;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 7cfdce10de36..73d32f655f18 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -138,17 +138,17 @@ static struct hlist_head *unix_sockets_unbound(void *addr)
#ifdef CONFIG_SECURITY_NETWORK
static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
{
- UNIXCB(skb).secid = scm->secid;
+ UNIXCB(skb).lsmblob = scm->lsmblob;
}
static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
{
- scm->secid = UNIXCB(skb).secid;
+ scm->lsmblob = UNIXCB(skb).lsmblob;
}
static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)
{
- return (scm->secid == UNIXCB(skb).secid);
+ return lsmblob_equal(&scm->lsmblob, &(UNIXCB(skb).lsmblob));
}
#else
static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
diff --git a/security/security.c b/security/security.c
index cee032b5ce29..a3be3929a60a 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2108,10 +2108,22 @@ int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
optval, optlen, len);
}
-int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
+int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
+ struct lsmblob *blob)
{
- return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock,
- skb, secid);
+ struct security_hook_list *hp;
+ int rc = -ENOPROTOOPT;
+
+ hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_dgram,
+ list) {
+ if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+ continue;
+ rc = hp->hook.socket_getpeersec_dgram(sock, skb,
+ &blob->secid[hp->lsmid->slot]);
+ if (rc != 0)
+ break;
+ }
+ return rc;
}
EXPORT_SYMBOL(security_socket_getpeersec_dgram);
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 07/25] LSM: Use lsmblob in security_secid_to_secctx
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
2019-12-24 23:13 ` [PATCH v12 05/25] net: Prepare UDS for security module stacking Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
` (8 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, netdev
Change security_secid_to_secctx() to take a lsmblob as input
instead of a u32 secid. It will then call the LSM hooks
using the lsmblob element allocated for that module. The
callers have been updated as well. This allows for the
possibility that more than one module may be called upon
to translate a secid to a string, as can occur in the
audit code.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
drivers/android/binder.c | 4 +++-
include/linux/security.h | 5 +++--
include/net/scm.h | 5 ++---
kernel/audit.c | 9 +++++++--
kernel/auditsc.c | 14 ++++++++++----
net/ipv4/ip_sockglue.c | 3 +--
net/netfilter/nf_conntrack_netlink.c | 8 ++++++--
net/netfilter/nf_conntrack_standalone.c | 4 +++-
net/netfilter/nfnetlink_queue.c | 8 ++++++--
net/netlabel/netlabel_unlabeled.c | 18 ++++++++++++++----
net/netlabel/netlabel_user.c | 6 +++---
security/security.c | 16 +++++++++++++---
12 files changed, 71 insertions(+), 29 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index e9bc9fcc7ea5..cd7a5f446457 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3105,10 +3105,12 @@ static void binder_transaction(struct binder_proc *proc,
if (target_node && target_node->txn_security_ctx) {
u32 secid;
+ struct lsmblob blob;
size_t added_size;
security_task_getsecid(proc->tsk, &secid);
- ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
+ lsmblob_init(&blob, secid);
+ ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
diff --git a/include/linux/security.h b/include/linux/security.h
index 8cae9e4bd760..26b8cee65c64 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -495,7 +495,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
+int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
void security_release_secctx(char *secdata, u32 seclen);
@@ -1296,7 +1296,8 @@ static inline int security_ismaclabel(const char *name)
return 0;
}
-static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+static inline int security_secid_to_secctx(struct lsmblob *blob,
+ char **secdata, u32 *seclen)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index e2e71c4bf9d0..31ae605fcc0a 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -97,9 +97,8 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- /* Scaffolding - it has to be element 0 for now */
- err = security_secid_to_secctx(scm->lsmblob.secid[0],
- &secdata, &seclen);
+ err = security_secid_to_secctx(&scm->lsmblob, &secdata,
+ &seclen);
if (!err) {
put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
diff --git a/kernel/audit.c b/kernel/audit.c
index 8e09f0f55b4b..e3e515158295 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1417,7 +1417,10 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_SIGNAL_INFO:
len = 0;
if (audit_sig_sid) {
- err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
+ struct lsmblob blob;
+
+ lsmblob_init(&blob, audit_sig_sid);
+ err = security_secid_to_secctx(&blob, &ctx, &len);
if (err)
return err;
}
@@ -2060,12 +2063,14 @@ int audit_log_task_context(struct audit_buffer *ab)
unsigned len;
int error;
u32 sid;
+ struct lsmblob blob;
security_task_getsecid(current, &sid);
if (!sid)
return 0;
- error = security_secid_to_secctx(sid, &ctx, &len);
+ lsmblob_init(&blob, sid);
+ error = security_secid_to_secctx(&blob, &ctx, &len);
if (error) {
if (error != -EINVAL)
goto error_path;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 7566e5b1c419..04803c3099b2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -966,6 +966,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
char *ctx = NULL;
u32 len;
int rc = 0;
+ struct lsmblob blob;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
if (!ab)
@@ -975,7 +976,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (sid) {
- if (security_secid_to_secctx(sid, &ctx, &len)) {
+ lsmblob_init(&blob, sid);
+ if (security_secid_to_secctx(&blob, &ctx, &len)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
@@ -1218,7 +1220,10 @@ static void show_special(struct audit_context *context, int *call_panic)
if (osid) {
char *ctx = NULL;
u32 len;
- if (security_secid_to_secctx(osid, &ctx, &len)) {
+ struct lsmblob blob;
+
+ lsmblob_init(&blob, osid);
+ if (security_secid_to_secctx(&blob, &ctx, &len)) {
audit_log_format(ab, " osid=%u", osid);
*call_panic = 1;
} else {
@@ -1368,9 +1373,10 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
if (n->osid != 0) {
char *ctx = NULL;
u32 len;
+ struct lsmblob blob;
- if (security_secid_to_secctx(
- n->osid, &ctx, &len)) {
+ lsmblob_init(&blob, n->osid);
+ if (security_secid_to_secctx(&blob, &ctx, &len)) {
audit_log_format(ab, " osid=%u", n->osid);
if (call_panic)
*call_panic = 2;
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 6cf57d5ac899..1ca97d0cb4a9 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -139,8 +139,7 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
if (err)
return;
- /* Scaffolding - it has to be element 0 */
- err = security_secid_to_secctx(lb.secid[0], &secdata, &seclen);
+ err = security_secid_to_secctx(&lb, &secdata, &seclen);
if (err)
return;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index d8d33ef52ce0..873dbd95f84a 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -331,8 +331,10 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
struct nlattr *nest_secctx;
int len, ret;
char *secctx;
+ struct lsmblob blob;
- ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
+ lsmblob_init(&blob, ct->secmark);
+ ret = security_secid_to_secctx(&blob, &secctx, &len);
if (ret)
return 0;
@@ -643,8 +645,10 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;
+ struct lsmblob blob;
- ret = security_secid_to_secctx(ct->secmark, NULL, &len);
+ lsmblob_init(&blob, ct->secmark);
+ ret = security_secid_to_secctx(&blob, NULL, &len);
if (ret)
return 0;
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 410809c669e1..183a85412155 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -175,8 +175,10 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
int ret;
u32 len;
char *secctx;
+ struct lsmblob blob;
- ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
+ lsmblob_init(&blob, ct->secmark);
+ ret = security_secid_to_secctx(&blob, &secctx, &len);
if (ret)
return;
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index feabdfb22920..bfa7f12fde99 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -305,13 +305,17 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
{
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
+ struct lsmblob blob;
+
if (!skb || !sk_fullsock(skb->sk))
return 0;
read_lock_bh(&skb->sk->sk_callback_lock);
- if (skb->secmark)
- security_secid_to_secctx(skb->secmark, secdata, &seclen);
+ if (skb->secmark) {
+ lsmblob_init(&blob, skb->secmark);
+ security_secid_to_secctx(&blob, secdata, &seclen);
+ }
read_unlock_bh(&skb->sk->sk_callback_lock);
#endif
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 7a5a87f15736..0cda17cb44a0 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -375,6 +375,7 @@ int netlbl_unlhsh_add(struct net *net,
struct audit_buffer *audit_buf = NULL;
char *secctx = NULL;
u32 secctx_len;
+ struct lsmblob blob;
if (addr_len != sizeof(struct in_addr) &&
addr_len != sizeof(struct in6_addr))
@@ -437,7 +438,8 @@ int netlbl_unlhsh_add(struct net *net,
unlhsh_add_return:
rcu_read_unlock();
if (audit_buf != NULL) {
- if (security_secid_to_secctx(secid,
+ lsmblob_init(&blob, secid);
+ if (security_secid_to_secctx(&blob,
&secctx,
&secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
@@ -474,6 +476,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct net_device *dev;
char *secctx;
u32 secctx_len;
+ struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
@@ -493,8 +496,10 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
addr->s_addr, mask->s_addr);
if (dev != NULL)
dev_put(dev);
+ if (entry != NULL)
+ lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(entry->secid,
+ security_secid_to_secctx(&blob,
&secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
security_release_secctx(secctx, secctx_len);
@@ -536,6 +541,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct net_device *dev;
char *secctx;
u32 secctx_len;
+ struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
@@ -554,8 +560,10 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
addr, mask);
if (dev != NULL)
dev_put(dev);
+ if (entry != NULL)
+ lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(entry->secid,
+ security_secid_to_secctx(&blob,
&secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
security_release_secctx(secctx, secctx_len);
@@ -1076,6 +1084,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
u32 secid;
char *secctx;
u32 secctx_len;
+ struct lsmblob blob;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
cb_arg->seq, &netlbl_unlabel_gnl_family,
@@ -1130,7 +1139,8 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
secid = addr6->secid;
}
- ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
+ lsmblob_init(&blob, secid);
+ ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index 3ed4fea2a2de..893301ae0131 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -86,6 +86,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
struct audit_buffer *audit_buf;
char *secctx;
u32 secctx_len;
+ struct lsmblob blob;
if (audit_enabled == AUDIT_OFF)
return NULL;
@@ -98,10 +99,9 @@ struct audit_buffer *netlbl_audit_start_common(int type,
from_kuid(&init_user_ns, audit_info->loginuid),
audit_info->sessionid);
+ lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(audit_info->secid,
- &secctx,
- &secctx_len) == 0) {
+ security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " subj=%s", secctx);
security_release_secctx(secctx, secctx_len);
}
diff --git a/security/security.c b/security/security.c
index 03ac668c0c10..61571f5c7c5f 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1963,10 +1963,20 @@ int security_ismaclabel(const char *name)
}
EXPORT_SYMBOL(security_ismaclabel);
-int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
{
- return call_int_hook(secid_to_secctx, -EOPNOTSUPP, secid, secdata,
- seclen);
+ struct security_hook_list *hp;
+ int rc;
+
+ hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
+ if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+ continue;
+ rc = hp->hook.secid_to_secctx(blob->secid[hp->lsmid->slot],
+ secdata, seclen);
+ if (rc != 0)
+ return rc;
+ }
+ return 0;
}
EXPORT_SYMBOL(security_secid_to_secctx);
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 09/25] LSM: Use lsmblob in security_task_getsecid
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
2019-12-24 23:13 ` [PATCH v12 05/25] net: Prepare UDS for security module stacking Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
` (7 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, linux-integrity
Change the security_task_getsecid() interface to fill in
a lsmblob structure instead of a u32 secid in support of
LSM stacking. Audit interfaces will need to collect all
possible secids for possible reporting.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: linux-integrity@vger.kernel.org
---
drivers/android/binder.c | 4 +--
include/linux/security.h | 7 +++--
kernel/audit.c | 11 +++----
kernel/auditfilter.c | 4 +--
kernel/auditsc.c | 18 ++++++++----
net/netlabel/netlabel_unlabeled.c | 5 +++-
net/netlabel/netlabel_user.h | 6 +++-
security/integrity/ima/ima_appraise.c | 4 ++-
security/integrity/ima/ima_main.c | 42 +++++++++++++++------------
security/security.c | 12 ++++++--
10 files changed, 69 insertions(+), 44 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index cd7a5f446457..a7a3b0737547 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3104,12 +3104,10 @@ static void binder_transaction(struct binder_proc *proc,
t->priority = task_nice(current);
if (target_node && target_node->txn_security_ctx) {
- u32 secid;
struct lsmblob blob;
size_t added_size;
- security_task_getsecid(proc->tsk, &secid);
- lsmblob_init(&blob, secid);
+ security_task_getsecid(proc->tsk, &blob);
ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
if (ret) {
return_error = BR_FAILED_REPLY;
diff --git a/include/linux/security.h b/include/linux/security.h
index 61a80afbbdba..b6d5475f8196 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -449,7 +449,7 @@ int security_task_fix_setuid(struct cred *new, const struct cred *old,
int security_task_setpgid(struct task_struct *p, pid_t pgid);
int security_task_getpgid(struct task_struct *p);
int security_task_getsid(struct task_struct *p);
-void security_task_getsecid(struct task_struct *p, u32 *secid);
+void security_task_getsecid(struct task_struct *p, struct lsmblob *blob);
int security_task_setnice(struct task_struct *p, int nice);
int security_task_setioprio(struct task_struct *p, int ioprio);
int security_task_getioprio(struct task_struct *p);
@@ -1101,9 +1101,10 @@ static inline int security_task_getsid(struct task_struct *p)
return 0;
}
-static inline void security_task_getsecid(struct task_struct *p, u32 *secid)
+static inline void security_task_getsecid(struct task_struct *p,
+ struct lsmblob *blob)
{
- *secid = 0;
+ lsmblob_init(blob, 0);
}
static inline int security_task_setnice(struct task_struct *p, int nice)
diff --git a/kernel/audit.c b/kernel/audit.c
index e3e515158295..6ee53e43c986 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -2062,14 +2062,12 @@ int audit_log_task_context(struct audit_buffer *ab)
char *ctx = NULL;
unsigned len;
int error;
- u32 sid;
struct lsmblob blob;
- security_task_getsecid(current, &sid);
- if (!sid)
+ security_task_getsecid(current, &blob);
+ if (!lsmblob_is_set(&blob))
return 0;
- lsmblob_init(&blob, sid);
error = security_secid_to_secctx(&blob, &ctx, &len);
if (error) {
if (error != -EINVAL)
@@ -2277,6 +2275,7 @@ int audit_set_loginuid(kuid_t loginuid)
int audit_signal_info(int sig, struct task_struct *t)
{
kuid_t uid = current_uid(), auid;
+ struct lsmblob blob;
if (auditd_test_task(t) &&
(sig == SIGTERM || sig == SIGHUP ||
@@ -2287,7 +2286,9 @@ int audit_signal_info(int sig, struct task_struct *t)
audit_sig_uid = auid;
else
audit_sig_uid = uid;
- security_task_getsecid(current, &audit_sig_sid);
+ security_task_getsecid(current, &blob);
+ /* scaffolding until audit_sig_sid is converted */
+ audit_sig_sid = blob.secid[0];
}
return audit_signal_info_syscall(t);
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 356db1dd276c..19cfbe716f9d 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1324,7 +1324,6 @@ int audit_filter(int msgtype, unsigned int listtype)
for (i = 0; i < e->rule.field_count; i++) {
struct audit_field *f = &e->rule.fields[i];
pid_t pid;
- u32 sid;
struct lsmblob blob;
switch (f->type) {
@@ -1355,8 +1354,7 @@ int audit_filter(int msgtype, unsigned int listtype)
case AUDIT_SUBJ_SEN:
case AUDIT_SUBJ_CLR:
if (f->lsm_rule) {
- security_task_getsecid(current, &sid);
- lsmblob_init(&blob, sid);
+ security_task_getsecid(current, &blob);
result = security_audit_rule_match(
&blob, f->type,
f->op, f->lsm_rule);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index ce8bf2d8f8d2..cccb681ad081 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -444,7 +444,6 @@ static int audit_filter_rules(struct task_struct *tsk,
{
const struct cred *cred;
int i, need_sid = 1;
- u32 sid;
struct lsmblob blob;
unsigned int sessionid;
@@ -641,10 +640,9 @@ static int audit_filter_rules(struct task_struct *tsk,
logged upon error */
if (f->lsm_rule) {
if (need_sid) {
- security_task_getsecid(tsk, &sid);
+ security_task_getsecid(tsk, &blob);
need_sid = 0;
}
- lsmblob_init(&blob, sid);
result = security_audit_rule_match(&blob,
f->type,
f->op,
@@ -2382,12 +2380,15 @@ int __audit_sockaddr(int len, void *a)
void __audit_ptrace(struct task_struct *t)
{
struct audit_context *context = audit_context();
+ struct lsmblob blob;
context->target_pid = task_tgid_nr(t);
context->target_auid = audit_get_loginuid(t);
context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
- security_task_getsecid(t, &context->target_sid);
+ security_task_getsecid(t, &blob);
+ /* scaffolding - until target_sid is converted */
+ context->target_sid = blob.secid[0];
memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
}
@@ -2403,6 +2404,7 @@ int audit_signal_info_syscall(struct task_struct *t)
struct audit_aux_data_pids *axp;
struct audit_context *ctx = audit_context();
kuid_t t_uid = task_uid(t);
+ struct lsmblob blob;
if (!audit_signals || audit_dummy_context())
return 0;
@@ -2414,7 +2416,9 @@ int audit_signal_info_syscall(struct task_struct *t)
ctx->target_auid = audit_get_loginuid(t);
ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
- security_task_getsecid(t, &ctx->target_sid);
+ security_task_getsecid(t, &blob);
+ /* scaffolding until target_sid is converted */
+ ctx->target_sid = blob.secid[0];
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
return 0;
}
@@ -2435,7 +2439,9 @@ int audit_signal_info_syscall(struct task_struct *t)
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
- security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
+ security_task_getsecid(t, &blob);
+ /* scaffolding until target_sid is converted */
+ axp->target_sid[axp->pid_count] = blob.secid[0];
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
axp->pid_count++;
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 0cda17cb44a0..e279b81d9545 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -1539,11 +1539,14 @@ int __init netlbl_unlabel_defconf(void)
int ret_val;
struct netlbl_dom_map *entry;
struct netlbl_audit audit_info;
+ struct lsmblob blob;
/* Only the kernel is allowed to call this function and the only time
* it is called is at bootup before the audit subsystem is reporting
* messages so don't worry to much about these values. */
- security_task_getsecid(current, &audit_info.secid);
+ security_task_getsecid(current, &blob);
+ /* scaffolding until audit_info.secid is converted */
+ audit_info.secid = blob.secid[0];
audit_info.loginuid = GLOBAL_ROOT_UID;
audit_info.sessionid = 0;
diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h
index 3c67afce64f1..438b5db6c714 100644
--- a/net/netlabel/netlabel_user.h
+++ b/net/netlabel/netlabel_user.h
@@ -34,7 +34,11 @@
static inline void netlbl_netlink_auditinfo(struct sk_buff *skb,
struct netlbl_audit *audit_info)
{
- security_task_getsecid(current, &audit_info->secid);
+ struct lsmblob blob;
+
+ security_task_getsecid(current, &blob);
+ /* scaffolding until secid is converted */
+ audit_info->secid = blob.secid[0];
audit_info->loginuid = audit_get_loginuid(current);
audit_info->sessionid = audit_get_sessionid(current);
}
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 300c8d2943c5..69e549164949 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -49,11 +49,13 @@ bool is_ima_appraise_enabled(void)
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
{
u32 secid;
+ struct lsmblob blob;
if (!ima_appraise)
return 0;
- security_task_getsecid(current, &secid);
+ security_task_getsecid(current, &blob);
+ lsmblob_secid(&blob, &secid);
return ima_match_policy(inode, current_cred(), secid, func, mask,
IMA_APPRAISE | IMA_HASH, NULL, NULL);
}
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index d7e987baf127..7c4bfc051ebc 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -384,12 +384,13 @@ static int process_measurement(struct file *file, const struct cred *cred,
*/
int ima_file_mmap(struct file *file, unsigned long prot)
{
- u32 secid;
+ struct lsmblob blob;
if (file && (prot & PROT_EXEC)) {
- security_task_getsecid(current, &secid);
- return process_measurement(file, current_cred(), secid, NULL,
- 0, MAY_EXEC, MMAP_CHECK);
+ security_task_getsecid(current, &blob);
+ /* scaffolding - until process_measurement changes */
+ return process_measurement(file, current_cred(), blob.secid[0],
+ NULL, 0, MAY_EXEC, MMAP_CHECK);
}
return 0;
@@ -412,10 +413,12 @@ int ima_bprm_check(struct linux_binprm *bprm)
{
int ret;
u32 secid;
+ struct lsmblob blob;
- security_task_getsecid(current, &secid);
- ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0,
- MAY_EXEC, BPRM_CHECK);
+ security_task_getsecid(current, &blob);
+ /* scaffolding until process_measurement changes */
+ ret = process_measurement(bprm->file, current_cred(), blob.secid[0],
+ NULL, 0, MAY_EXEC, BPRM_CHECK);
if (ret)
return ret;
@@ -436,10 +439,11 @@ int ima_bprm_check(struct linux_binprm *bprm)
*/
int ima_file_check(struct file *file, int mask)
{
- u32 secid;
+ struct lsmblob blob;
- security_task_getsecid(current, &secid);
- return process_measurement(file, current_cred(), secid, NULL, 0,
+ security_task_getsecid(current, &blob);
+ /* scaffolding until process_measurement changes */
+ return process_measurement(file, current_cred(), blob.secid[0], NULL, 0,
mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
MAY_APPEND), FILE_CHECK);
}
@@ -548,7 +552,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
enum kernel_read_file_id read_id)
{
enum ima_hooks func;
- u32 secid;
+ struct lsmblob blob;
if (!file && read_id == READING_FIRMWARE) {
if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
@@ -570,9 +574,10 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
}
func = read_idmap[read_id] ?: FILE_CHECK;
- security_task_getsecid(current, &secid);
- return process_measurement(file, current_cred(), secid, buf, size,
- MAY_READ, func);
+ security_task_getsecid(current, &blob);
+ /* scaffolding until process_measurement changes */
+ return process_measurement(file, current_cred(), blob.secid[0], buf,
+ size, MAY_READ, func);
}
/**
@@ -653,7 +658,7 @@ void process_buffer_measurement(const void *buf, int size,
} hash = {};
int violation = 0;
int action = 0;
- u32 secid;
+ struct lsmblob blob;
/*
* Both LSM hooks and auxilary based buffer measurements are
@@ -663,9 +668,10 @@ void process_buffer_measurement(const void *buf, int size,
* buffer measurements.
*/
if (func) {
- security_task_getsecid(current, &secid);
- action = ima_get_action(NULL, current_cred(), secid, 0, func,
- &pcr, &template);
+ security_task_getsecid(current, &blob);
+ /* scaffolding */
+ action = ima_get_action(NULL, current_cred(), blob.secid[0],
+ 0, func, &pcr, &template);
if (!(action & IMA_MEASURE))
return;
}
diff --git a/security/security.c b/security/security.c
index 0d87a2349552..c42573958630 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1700,10 +1700,16 @@ int security_task_getsid(struct task_struct *p)
return call_int_hook(task_getsid, 0, p);
}
-void security_task_getsecid(struct task_struct *p, u32 *secid)
+void security_task_getsecid(struct task_struct *p, struct lsmblob *blob)
{
- *secid = 0;
- call_void_hook(task_getsecid, p, secid);
+ struct security_hook_list *hp;
+
+ lsmblob_init(blob, 0);
+ hlist_for_each_entry(hp, &security_hook_heads.task_getsecid, list) {
+ if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+ continue;
+ hp->hook.task_getsecid(p, &blob->secid[hp->lsmid->slot]);
+ }
}
EXPORT_SYMBOL(security_task_getsecid);
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 10/25] LSM: Use lsmblob in security_inode_getsecid
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (2 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
` (6 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, linux-integrity
Change the security_inode_getsecid() interface to fill in a
lsmblob structure instead of a u32 secid. This allows for its
callers to gather data from all registered LSMs. Data is provided
for IMA and audit.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: linux-integrity@vger.kernel.org
---
include/linux/security.h | 7 ++++---
kernel/auditsc.c | 6 +++++-
security/integrity/ima/ima_policy.c | 4 +---
security/security.c | 11 +++++++++--
4 files changed, 19 insertions(+), 9 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index b6d5475f8196..e0acc09a79fe 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -409,7 +409,7 @@ int security_inode_killpriv(struct dentry *dentry);
int security_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc);
int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size);
-void security_inode_getsecid(struct inode *inode, u32 *secid);
+void security_inode_getsecid(struct inode *inode, struct lsmblob *blob);
int security_inode_copy_up(struct dentry *src, struct cred **new);
int security_inode_copy_up_xattr(const char *name);
int security_kernfs_init_security(struct kernfs_node *kn_dir,
@@ -924,9 +924,10 @@ static inline int security_inode_listsecurity(struct inode *inode, char *buffer,
return 0;
}
-static inline void security_inode_getsecid(struct inode *inode, u32 *secid)
+static inline void security_inode_getsecid(struct inode *inode,
+ struct lsmblob *blob)
{
- *secid = 0;
+ lsmblob_init(blob, 0);
}
static inline int security_inode_copy_up(struct dentry *src, struct cred **new)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cccb681ad081..5752e51883d5 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1931,13 +1931,17 @@ static void audit_copy_inode(struct audit_names *name,
const struct dentry *dentry,
struct inode *inode, unsigned int flags)
{
+ struct lsmblob blob;
+
name->ino = inode->i_ino;
name->dev = inode->i_sb->s_dev;
name->mode = inode->i_mode;
name->uid = inode->i_uid;
name->gid = inode->i_gid;
name->rdev = inode->i_rdev;
- security_inode_getsecid(inode, &name->osid);
+ security_inode_getsecid(inode, &blob);
+ /* scaffolding until osid is updated */
+ name->osid = blob.secid[0];
if (flags & AUDIT_INODE_NOEVAL) {
name->fcap_ver = -1;
return;
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 193ddd55420b..c7d2ea47a326 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -413,7 +413,6 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
return false;
for (i = 0; i < MAX_LSM_RULES; i++) {
int rc = 0;
- u32 osid;
struct lsmblob blob;
if (!rule->lsm[i].rule)
@@ -423,8 +422,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
case LSM_OBJ_USER:
case LSM_OBJ_ROLE:
case LSM_OBJ_TYPE:
- security_inode_getsecid(inode, &osid);
- lsmblob_init(&blob, osid);
+ security_inode_getsecid(inode, &blob);
rc = security_filter_rule_match(&blob,
rule->lsm[i].type,
Audit_equal,
diff --git a/security/security.c b/security/security.c
index c42573958630..66322a2a2beb 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1386,9 +1386,16 @@ int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer
}
EXPORT_SYMBOL(security_inode_listsecurity);
-void security_inode_getsecid(struct inode *inode, u32 *secid)
+void security_inode_getsecid(struct inode *inode, struct lsmblob *blob)
{
- call_void_hook(inode_getsecid, inode, secid);
+ struct security_hook_list *hp;
+
+ lsmblob_init(blob, 0);
+ hlist_for_each_entry(hp, &security_hook_heads.inode_getsecid, list) {
+ if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+ continue;
+ hp->hook.inode_getsecid(inode, &blob->secid[hp->lsmid->slot]);
+ }
}
int security_inode_copy_up(struct dentry *src, struct cred **new)
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 11/25] LSM: Use lsmblob in security_cred_getsecid
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (3 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 12/25] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
` (5 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, linux-integrity
Change the security_cred_getsecid() interface to fill in a
lsmblob instead of a u32 secid. The associated data elements
in the audit sub-system are changed from a secid to a lsmblob
to accommodate multiple possible LSM audit users.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: linux-integrity@vger.kernel.org
---
include/linux/security.h | 2 +-
kernel/audit.c | 19 +++++++-----------
kernel/audit.h | 5 +++--
kernel/auditsc.c | 33 +++++++++++--------------------
security/integrity/ima/ima_main.c | 8 ++++----
security/security.c | 12 ++++++++---
6 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index e0acc09a79fe..d12b5e828b8d 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -436,7 +436,7 @@ int security_cred_alloc_blank(struct cred *cred, gfp_t gfp);
void security_cred_free(struct cred *cred);
int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp);
void security_transfer_creds(struct cred *new, const struct cred *old);
-void security_cred_getsecid(const struct cred *c, u32 *secid);
+void security_cred_getsecid(const struct cred *c, struct lsmblob *blob);
int security_kernel_act_as(struct cred *new, struct lsmblob *blob);
int security_kernel_create_files_as(struct cred *new, struct inode *inode);
int security_kernel_module_request(char *kmod_name);
diff --git a/kernel/audit.c b/kernel/audit.c
index 6ee53e43c986..69b52f25038a 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -124,7 +124,7 @@ static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
/* The identity of the user shutting down the audit system. */
kuid_t audit_sig_uid = INVALID_UID;
pid_t audit_sig_pid = -1;
-u32 audit_sig_sid = 0;
+struct lsmblob audit_sig_lsm;
/* Records can be lost in several ways:
0) [suppressed in audit_alloc]
@@ -1416,23 +1416,21 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
case AUDIT_SIGNAL_INFO:
len = 0;
- if (audit_sig_sid) {
- struct lsmblob blob;
-
- lsmblob_init(&blob, audit_sig_sid);
- err = security_secid_to_secctx(&blob, &ctx, &len);
+ if (lsmblob_is_set(&audit_sig_lsm)) {
+ err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
+ &len);
if (err)
return err;
}
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
if (!sig_data) {
- if (audit_sig_sid)
+ if (lsmblob_is_set(&audit_sig_lsm))
security_release_secctx(ctx, len);
return -ENOMEM;
}
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
- if (audit_sig_sid) {
+ if (lsmblob_is_set(&audit_sig_lsm)) {
memcpy(sig_data->ctx, ctx, len);
security_release_secctx(ctx, len);
}
@@ -2275,7 +2273,6 @@ int audit_set_loginuid(kuid_t loginuid)
int audit_signal_info(int sig, struct task_struct *t)
{
kuid_t uid = current_uid(), auid;
- struct lsmblob blob;
if (auditd_test_task(t) &&
(sig == SIGTERM || sig == SIGHUP ||
@@ -2286,9 +2283,7 @@ int audit_signal_info(int sig, struct task_struct *t)
audit_sig_uid = auid;
else
audit_sig_uid = uid;
- security_task_getsecid(current, &blob);
- /* scaffolding until audit_sig_sid is converted */
- audit_sig_sid = blob.secid[0];
+ security_task_getsecid(current, &audit_sig_lsm);
}
return audit_signal_info_syscall(t);
diff --git a/kernel/audit.h b/kernel/audit.h
index 6fb7160412d4..af9bc09e656c 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -9,6 +9,7 @@
#include <linux/fs.h>
#include <linux/audit.h>
#include <linux/skbuff.h>
+#include <linux/security.h>
#include <uapi/linux/mqueue.h>
#include <linux/tty.h>
@@ -134,7 +135,7 @@ struct audit_context {
kuid_t target_auid;
kuid_t target_uid;
unsigned int target_sessionid;
- u32 target_sid;
+ struct lsmblob target_lsm;
char target_comm[TASK_COMM_LEN];
struct audit_tree_refs *trees, *first_trees;
@@ -329,7 +330,7 @@ extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
extern pid_t audit_sig_pid;
extern kuid_t audit_sig_uid;
-extern u32 audit_sig_sid;
+extern struct lsmblob audit_sig_lsm;
extern int audit_filter(int msgtype, unsigned int listtype);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 5752e51883d5..c1e3ac8eb1ad 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -112,7 +112,7 @@ struct audit_aux_data_pids {
kuid_t target_auid[AUDIT_AUX_PIDS];
kuid_t target_uid[AUDIT_AUX_PIDS];
unsigned int target_sessionid[AUDIT_AUX_PIDS];
- u32 target_sid[AUDIT_AUX_PIDS];
+ struct lsmblob target_lsm[AUDIT_AUX_PIDS];
char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
int pid_count;
};
@@ -957,14 +957,14 @@ static inline void audit_free_context(struct audit_context *context)
}
static int audit_log_pid_context(struct audit_context *context, pid_t pid,
- kuid_t auid, kuid_t uid, unsigned int sessionid,
- u32 sid, char *comm)
+ kuid_t auid, kuid_t uid,
+ unsigned int sessionid,
+ struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
char *ctx = NULL;
u32 len;
int rc = 0;
- struct lsmblob blob;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
if (!ab)
@@ -973,9 +973,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
- if (sid) {
- lsmblob_init(&blob, sid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (lsmblob_is_set(blob)) {
+ if (security_secid_to_secctx(blob, &ctx, &len)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
@@ -1546,7 +1545,7 @@ static void audit_log_exit(void)
axs->target_auid[i],
axs->target_uid[i],
axs->target_sessionid[i],
- axs->target_sid[i],
+ &axs->target_lsm[i],
axs->target_comm[i]))
call_panic = 1;
}
@@ -1555,7 +1554,7 @@ static void audit_log_exit(void)
audit_log_pid_context(context, context->target_pid,
context->target_auid, context->target_uid,
context->target_sessionid,
- context->target_sid, context->target_comm))
+ &context->target_lsm, context->target_comm))
call_panic = 1;
if (context->pwd.dentry && context->pwd.mnt) {
@@ -1733,7 +1732,7 @@ void __audit_syscall_exit(int success, long return_code)
context->aux = NULL;
context->aux_pids = NULL;
context->target_pid = 0;
- context->target_sid = 0;
+ lsmblob_init(&context->target_lsm, 0);
context->sockaddr_len = 0;
context->type = 0;
context->fds[0] = -1;
@@ -2384,15 +2383,12 @@ int __audit_sockaddr(int len, void *a)
void __audit_ptrace(struct task_struct *t)
{
struct audit_context *context = audit_context();
- struct lsmblob blob;
context->target_pid = task_tgid_nr(t);
context->target_auid = audit_get_loginuid(t);
context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
- security_task_getsecid(t, &blob);
- /* scaffolding - until target_sid is converted */
- context->target_sid = blob.secid[0];
+ security_task_getsecid(t, &context->target_lsm);
memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
}
@@ -2408,7 +2404,6 @@ int audit_signal_info_syscall(struct task_struct *t)
struct audit_aux_data_pids *axp;
struct audit_context *ctx = audit_context();
kuid_t t_uid = task_uid(t);
- struct lsmblob blob;
if (!audit_signals || audit_dummy_context())
return 0;
@@ -2420,9 +2415,7 @@ int audit_signal_info_syscall(struct task_struct *t)
ctx->target_auid = audit_get_loginuid(t);
ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
- security_task_getsecid(t, &blob);
- /* scaffolding until target_sid is converted */
- ctx->target_sid = blob.secid[0];
+ security_task_getsecid(t, &ctx->target_lsm);
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
return 0;
}
@@ -2443,9 +2436,7 @@ int audit_signal_info_syscall(struct task_struct *t)
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
- security_task_getsecid(t, &blob);
- /* scaffolding until target_sid is converted */
- axp->target_sid[axp->pid_count] = blob.secid[0];
+ security_task_getsecid(t, &axp->target_lsm[axp->pid_count]);
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
axp->pid_count++;
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 7c4bfc051ebc..c8e3e234d446 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -412,7 +412,6 @@ int ima_file_mmap(struct file *file, unsigned long prot)
int ima_bprm_check(struct linux_binprm *bprm)
{
int ret;
- u32 secid;
struct lsmblob blob;
security_task_getsecid(current, &blob);
@@ -422,9 +421,10 @@ int ima_bprm_check(struct linux_binprm *bprm)
if (ret)
return ret;
- security_cred_getsecid(bprm->cred, &secid);
- return process_measurement(bprm->file, bprm->cred, secid, NULL, 0,
- MAY_EXEC, CREDS_CHECK);
+ security_cred_getsecid(bprm->cred, &blob);
+ /* scaffolding until process_measurement changes */
+ return process_measurement(bprm->file, bprm->cred, blob.secid[0],
+ NULL, 0, MAY_EXEC, CREDS_CHECK);
}
/**
diff --git a/security/security.c b/security/security.c
index 66322a2a2beb..32354942b7e8 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1615,10 +1615,16 @@ void security_transfer_creds(struct cred *new, const struct cred *old)
call_void_hook(cred_transfer, new, old);
}
-void security_cred_getsecid(const struct cred *c, u32 *secid)
+void security_cred_getsecid(const struct cred *c, struct lsmblob *blob)
{
- *secid = 0;
- call_void_hook(cred_getsecid, c, secid);
+ struct security_hook_list *hp;
+
+ lsmblob_init(blob, 0);
+ hlist_for_each_entry(hp, &security_hook_heads.cred_getsecid, list) {
+ if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+ continue;
+ hp->hook.cred_getsecid(c, &blob->secid[hp->lsmid->slot]);
+ }
}
EXPORT_SYMBOL(security_cred_getsecid);
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 12/25] IMA: Change internal interfaces to use lsmblobs
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (4 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
` (4 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, linux-integrity
The IMA interfaces ima_get_action() and ima_match_policy()
call LSM functions that use lsmblobs. Change the IMA functions
to pass the lsmblob to be compatible with the LSM functions.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: linux-integrity@vger.kernel.org
---
security/integrity/ima/ima.h | 11 ++++-----
security/integrity/ima/ima_api.c | 10 ++++-----
security/integrity/ima/ima_appraise.c | 4 +---
security/integrity/ima/ima_main.c | 32 +++++++++++----------------
security/integrity/ima/ima_policy.c | 12 +++++-----
5 files changed, 31 insertions(+), 38 deletions(-)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index d95b0ece7434..96b6662ea39f 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -205,9 +205,9 @@ extern const char *const func_tokens[];
struct modsig;
/* LIM API function definitions */
-int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
- int mask, enum ima_hooks func, int *pcr,
- struct ima_template_desc **template_desc);
+int ima_get_action(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, int mask, enum ima_hooks func,
+ int *pcr, struct ima_template_desc **template_desc);
int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
int ima_collect_measurement(struct integrity_iint_cache *iint,
struct file *file, void *buf, loff_t size,
@@ -232,8 +232,9 @@ void ima_free_template_entry(struct ima_template_entry *entry);
const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
/* IMA policy related functions */
-int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
- enum ima_hooks func, int mask, int flags, int *pcr,
+int ima_match_policy(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, enum ima_hooks func, int mask,
+ int flags, int *pcr,
struct ima_template_desc **template_desc);
void ima_init_policy(void);
void ima_update_policy(void);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 610759fe63b8..1ab769fa7df6 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -163,7 +163,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
* ima_get_action - appraise & measure decision based on policy.
* @inode: pointer to inode to measure
* @cred: pointer to credentials structure to validate
- * @secid: secid of the task being validated
+ * @blob: LSM data of the task being validated
* @mask: contains the permission mask (MAY_READ, MAY_WRITE, MAY_EXEC,
* MAY_APPEND)
* @func: caller identifier
@@ -181,15 +181,15 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
* Returns IMA_MEASURE, IMA_APPRAISE mask.
*
*/
-int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
- int mask, enum ima_hooks func, int *pcr,
- struct ima_template_desc **template_desc)
+int ima_get_action(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, int mask, enum ima_hooks func,
+ int *pcr, struct ima_template_desc **template_desc)
{
int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH;
flags &= ima_policy_flag;
- return ima_match_policy(inode, cred, secid, func, mask, flags, pcr,
+ return ima_match_policy(inode, cred, blob, func, mask, flags, pcr,
template_desc);
}
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 69e549164949..01c755a242ac 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -48,15 +48,13 @@ bool is_ima_appraise_enabled(void)
*/
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
{
- u32 secid;
struct lsmblob blob;
if (!ima_appraise)
return 0;
security_task_getsecid(current, &blob);
- lsmblob_secid(&blob, &secid);
- return ima_match_policy(inode, current_cred(), secid, func, mask,
+ return ima_match_policy(inode, current_cred(), &blob, func, mask,
IMA_APPRAISE | IMA_HASH, NULL, NULL);
}
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index c8e3e234d446..86cc1419587e 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -190,8 +190,8 @@ void ima_file_free(struct file *file)
}
static int process_measurement(struct file *file, const struct cred *cred,
- u32 secid, char *buf, loff_t size, int mask,
- enum ima_hooks func)
+ struct lsmblob *blob, char *buf, loff_t size,
+ int mask, enum ima_hooks func)
{
struct inode *inode = file_inode(file);
struct integrity_iint_cache *iint = NULL;
@@ -214,7 +214,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
* bitmask based on the appraise/audit/measurement policy.
* Included is the appraise submask.
*/
- action = ima_get_action(inode, cred, secid, mask, func, &pcr,
+ action = ima_get_action(inode, cred, blob, mask, func, &pcr,
&template_desc);
violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
(ima_policy_flag & IMA_MEASURE));
@@ -388,8 +388,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
if (file && (prot & PROT_EXEC)) {
security_task_getsecid(current, &blob);
- /* scaffolding - until process_measurement changes */
- return process_measurement(file, current_cred(), blob.secid[0],
+ return process_measurement(file, current_cred(), &blob,
NULL, 0, MAY_EXEC, MMAP_CHECK);
}
@@ -415,16 +414,14 @@ int ima_bprm_check(struct linux_binprm *bprm)
struct lsmblob blob;
security_task_getsecid(current, &blob);
- /* scaffolding until process_measurement changes */
- ret = process_measurement(bprm->file, current_cred(), blob.secid[0],
- NULL, 0, MAY_EXEC, BPRM_CHECK);
+ ret = process_measurement(bprm->file, current_cred(), &blob, NULL, 0,
+ MAY_EXEC, BPRM_CHECK);
if (ret)
return ret;
security_cred_getsecid(bprm->cred, &blob);
- /* scaffolding until process_measurement changes */
- return process_measurement(bprm->file, bprm->cred, blob.secid[0],
- NULL, 0, MAY_EXEC, CREDS_CHECK);
+ return process_measurement(bprm->file, bprm->cred, &blob, NULL, 0,
+ MAY_EXEC, CREDS_CHECK);
}
/**
@@ -442,8 +439,7 @@ int ima_file_check(struct file *file, int mask)
struct lsmblob blob;
security_task_getsecid(current, &blob);
- /* scaffolding until process_measurement changes */
- return process_measurement(file, current_cred(), blob.secid[0], NULL, 0,
+ return process_measurement(file, current_cred(), &blob, NULL, 0,
mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
MAY_APPEND), FILE_CHECK);
}
@@ -575,9 +571,8 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
func = read_idmap[read_id] ?: FILE_CHECK;
security_task_getsecid(current, &blob);
- /* scaffolding until process_measurement changes */
- return process_measurement(file, current_cred(), blob.secid[0], buf,
- size, MAY_READ, func);
+ return process_measurement(file, current_cred(), &blob, buf, size,
+ MAY_READ, func);
}
/**
@@ -669,9 +664,8 @@ void process_buffer_measurement(const void *buf, int size,
*/
if (func) {
security_task_getsecid(current, &blob);
- /* scaffolding */
- action = ima_get_action(NULL, current_cred(), blob.secid[0],
- 0, func, &pcr, &template);
+ action = ima_get_action(NULL, current_cred(), &blob, 0, func,
+ &pcr, &template);
if (!(action & IMA_MEASURE))
return;
}
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index c7d2ea47a326..b089d4a8b27b 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -368,7 +368,7 @@ int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
* Returns true on rule match, false on failure.
*/
static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
- const struct cred *cred, u32 secid,
+ const struct cred *cred, struct lsmblob *blob,
enum ima_hooks func, int mask)
{
int i;
@@ -431,7 +431,6 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
case LSM_SUBJ_USER:
case LSM_SUBJ_ROLE:
case LSM_SUBJ_TYPE:
- lsmblob_init(&blob, secid);
rc = security_filter_rule_match(&blob,
rule->lsm[i].type,
Audit_equal,
@@ -475,7 +474,7 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
* @inode: pointer to an inode for which the policy decision is being made
* @cred: pointer to a credentials structure for which the policy decision is
* being made
- * @secid: LSM secid of the task to be validated
+ * @blob: LSM data of the task to be validated
* @func: IMA hook identifier
* @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
* @pcr: set the pcr to extend
@@ -488,8 +487,9 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
* list when walking it. Reads are many orders of magnitude more numerous
* than writes so ima_match_policy() is classical RCU candidate.
*/
-int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
- enum ima_hooks func, int mask, int flags, int *pcr,
+int ima_match_policy(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, enum ima_hooks func, int mask,
+ int flags, int *pcr,
struct ima_template_desc **template_desc)
{
struct ima_rule_entry *entry;
@@ -504,7 +504,7 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
if (!(entry->action & actmask))
continue;
- if (!ima_match_rules(entry, inode, cred, secid, func, mask))
+ if (!ima_match_rules(entry, inode, cred, blob, func, mask))
continue;
action |= entry->flags & IMA_ACTION_FLAGS;
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 14/25] LSM: Ensure the correct LSM context releaser
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (5 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 12/25] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
` (3 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, linux-integrity, netdev
Add a new lsmcontext data structure to hold all the information
about a "security context", including the string, its size and
which LSM allocated the string. The allocation information is
necessary because LSMs have different policies regarding the
lifecycle of these strings. SELinux allocates and destroys
them on each use, whereas Smack provides a pointer to an entry
in a list that never goes away.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: linux-integrity@vger.kernel.org
cc: netdev@vger.kernel.org
---
drivers/android/binder.c | 10 +++++--
fs/ceph/xattr.c | 6 +++-
fs/nfs/nfs4proc.c | 8 +++--
fs/nfsd/nfs4xdr.c | 7 +++--
include/linux/security.h | 39 +++++++++++++++++++++++--
include/net/scm.h | 5 +++-
kernel/audit.c | 14 ++++++---
kernel/auditsc.c | 12 ++++++--
net/ipv4/ip_sockglue.c | 4 ++-
net/netfilter/nf_conntrack_netlink.c | 4 ++-
net/netfilter/nf_conntrack_standalone.c | 4 ++-
net/netfilter/nfnetlink_queue.c | 13 ++++++---
net/netlabel/netlabel_unlabeled.c | 19 +++++++++---
net/netlabel/netlabel_user.c | 4 ++-
security/security.c | 18 ++++++++----
security/smack/smack_lsm.c | 14 ++++++---
16 files changed, 141 insertions(+), 40 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index a7a3b0737547..1bca4d589e87 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2861,6 +2861,7 @@ static void binder_transaction(struct binder_proc *proc,
int t_debug_id = atomic_inc_return(&binder_last_id);
char *secctx = NULL;
u32 secctx_sz = 0;
+ struct lsmcontext scaff; /* scaffolding */
e = binder_transaction_log_add(&binder_transaction_log);
e->debug_id = t_debug_id;
@@ -3157,7 +3158,8 @@ static void binder_transaction(struct binder_proc *proc,
t->security_ctx = 0;
WARN_ON(1);
}
- security_release_secctx(secctx, secctx_sz);
+ lsmcontext_init(&scaff, secctx, secctx_sz, 0);
+ security_release_secctx(&scaff);
secctx = NULL;
}
t->buffer->debug_id = t->debug_id;
@@ -3490,8 +3492,10 @@ static void binder_transaction(struct binder_proc *proc,
binder_alloc_free_buf(&target_proc->alloc, t->buffer);
err_binder_alloc_buf_failed:
err_bad_extra_size:
- if (secctx)
- security_release_secctx(secctx, secctx_sz);
+ if (secctx) {
+ lsmcontext_init(&scaff, secctx, secctx_sz, 0);
+ security_release_secctx(&scaff);
+ }
err_get_secctx_failed:
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index cb18ee637cb7..ad501b5cad2c 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -1271,12 +1271,16 @@ int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
{
+#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
+ struct lsmcontext scaff; /* scaffolding */
+#endif
#ifdef CONFIG_CEPH_FS_POSIX_ACL
posix_acl_release(as_ctx->acl);
posix_acl_release(as_ctx->default_acl);
#endif
#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
- security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen);
+ lsmcontext_init(&scaff, as_ctx->sec_ctx, as_ctx->sec_ctxlen, 0);
+ security_release_secctx(&scaff);
#endif
if (as_ctx->pagelist)
ceph_pagelist_release(as_ctx->pagelist);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 76d37161409a..a30e36654c57 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -130,8 +130,12 @@ nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
static inline void
nfs4_label_release_security(struct nfs4_label *label)
{
- if (label)
- security_release_secctx(label->label, label->len);
+ struct lsmcontext scaff; /* scaffolding */
+
+ if (label) {
+ lsmcontext_init(&scaff, label->label, label->len, 0);
+ security_release_secctx(&scaff);
+ }
}
static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
{
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index d2dc4c0e22e8..e20011281915 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2421,6 +2421,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
int err;
struct nfs4_acl *acl = NULL;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
+ struct lsmcontext scaff; /* scaffolding */
void *context = NULL;
int contextlen;
#endif
@@ -2923,8 +2924,10 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
out:
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
- if (context)
- security_release_secctx(context, contextlen);
+ if (context) {
+ lsmcontext_init(&scaff, context, contextlen, 0); /*scaffolding*/
+ security_release_secctx(&scaff);
+ }
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
kfree(acl);
if (tempfh) {
diff --git a/include/linux/security.h b/include/linux/security.h
index d12b5e828b8d..597d9802b89b 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -128,6 +128,41 @@ enum lockdown_reason {
LOCKDOWN_CONFIDENTIALITY_MAX,
};
+/*
+ * A "security context" is the text representation of
+ * the information used by LSMs.
+ * This structure contains the string, its length, and which LSM
+ * it is useful for.
+ */
+struct lsmcontext {
+ char *context; /* Provided by the module */
+ u32 len;
+ int slot; /* Identifies the module */
+};
+
+/**
+ * lsmcontext_init - initialize an lsmcontext structure.
+ * @cp: Pointer to the context to initialize
+ * @context: Initial context, or NULL
+ * @size: Size of context, or 0
+ * @slot: Which LSM provided the context
+ *
+ * Fill in the lsmcontext from the provided information.
+ * This is a scaffolding function that will be removed when
+ * lsmcontext integration is complete.
+ */
+static inline void lsmcontext_init(struct lsmcontext *cp, char *context,
+ u32 size, int slot)
+{
+ cp->slot = slot;
+ cp->context = context;
+
+ if (context == NULL || size == 0)
+ cp->len = 0;
+ else
+ cp->len = strlen(context);
+}
+
/*
* Data exported by the security modules
*
@@ -498,7 +533,7 @@ int security_ismaclabel(const char *name);
int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
-void security_release_secctx(char *secdata, u32 seclen);
+void security_release_secctx(struct lsmcontext *cp);
void security_inode_invalidate_secctx(struct inode *inode);
int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);
int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);
@@ -1312,7 +1347,7 @@ static inline int security_secctx_to_secid(const char *secdata,
return -EOPNOTSUPP;
}
-static inline void security_release_secctx(char *secdata, u32 seclen)
+static inline void security_release_secctx(struct lsmcontext *cp)
{
}
diff --git a/include/net/scm.h b/include/net/scm.h
index 31ae605fcc0a..30ba801c91bd 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -92,6 +92,7 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
#ifdef CONFIG_SECURITY_NETWORK
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{
+ struct lsmcontext context;
char *secdata;
u32 seclen;
int err;
@@ -102,7 +103,9 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc
if (!err) {
put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
- security_release_secctx(secdata, seclen);
+ /*scaffolding*/
+ lsmcontext_init(&context, secdata, seclen, 0);
+ security_release_secctx(&context);
}
}
}
diff --git a/kernel/audit.c b/kernel/audit.c
index 69b52f25038a..3305c4af43a8 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1180,6 +1180,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_sig_info *sig_data;
char *ctx = NULL;
u32 len;
+ struct lsmcontext scaff; /* scaffolding */
err = audit_netlink_ok(skb, msg_type);
if (err)
@@ -1424,15 +1425,18 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
if (!sig_data) {
- if (lsmblob_is_set(&audit_sig_lsm))
- security_release_secctx(ctx, len);
+ if (lsmblob_is_set(&audit_sig_lsm)) {
+ lsmcontext_init(&scaff, ctx, len, 0);
+ security_release_secctx(&scaff);
+ }
return -ENOMEM;
}
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
if (lsmblob_is_set(&audit_sig_lsm)) {
memcpy(sig_data->ctx, ctx, len);
- security_release_secctx(ctx, len);
+ lsmcontext_init(&scaff, ctx, len, 0);
+ security_release_secctx(&scaff);
}
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
sig_data, sizeof(*sig_data) + len);
@@ -2061,6 +2065,7 @@ int audit_log_task_context(struct audit_buffer *ab)
unsigned len;
int error;
struct lsmblob blob;
+ struct lsmcontext scaff; /* scaffolding */
security_task_getsecid(current, &blob);
if (!lsmblob_is_set(&blob))
@@ -2074,7 +2079,8 @@ int audit_log_task_context(struct audit_buffer *ab)
}
audit_log_format(ab, " subj=%s", ctx);
- security_release_secctx(ctx, len);
+ lsmcontext_init(&scaff, ctx, len, 0);
+ security_release_secctx(&scaff);
return 0;
error_path:
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index c1e3ac8eb1ad..8790e7aafa7d 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -962,6 +962,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
+ struct lsmcontext lsmcxt;
char *ctx = NULL;
u32 len;
int rc = 0;
@@ -979,7 +980,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
rc = 1;
} else {
audit_log_format(ab, " obj=%s", ctx);
- security_release_secctx(ctx, len);
+ lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/
+ security_release_secctx(&lsmcxt);
}
}
audit_log_format(ab, " ocomm=");
@@ -1192,6 +1194,7 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
static void show_special(struct audit_context *context, int *call_panic)
{
+ struct lsmcontext lsmcxt;
struct audit_buffer *ab;
int i;
@@ -1225,7 +1228,8 @@ static void show_special(struct audit_context *context, int *call_panic)
*call_panic = 1;
} else {
audit_log_format(ab, " obj=%s", ctx);
- security_release_secctx(ctx, len);
+ lsmcontext_init(&lsmcxt, ctx, len, 0);
+ security_release_secctx(&lsmcxt);
}
}
if (context->ipc.has_perm) {
@@ -1371,6 +1375,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
char *ctx = NULL;
u32 len;
struct lsmblob blob;
+ struct lsmcontext lsmcxt;
lsmblob_init(&blob, n->osid);
if (security_secid_to_secctx(&blob, &ctx, &len)) {
@@ -1379,7 +1384,8 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
*call_panic = 2;
} else {
audit_log_format(ab, " obj=%s", ctx);
- security_release_secctx(ctx, len);
+ lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */
+ security_release_secctx(&lsmcxt);
}
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 1ca97d0cb4a9..96d56a30ecca 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -130,6 +130,7 @@ static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
+ struct lsmcontext context;
struct lsmblob lb;
char *secdata;
u32 seclen;
@@ -144,7 +145,8 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
return;
put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
- security_release_secctx(secdata, seclen);
+ lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */
+ security_release_secctx(&context);
}
static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 873dbd95f84a..2f233f40c926 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -332,6 +332,7 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
int len, ret;
char *secctx;
struct lsmblob blob;
+ struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
ret = security_secid_to_secctx(&blob, &secctx, &len);
@@ -349,7 +350,8 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
ret = 0;
nla_put_failure:
- security_release_secctx(secctx, len);
+ lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
+ security_release_secctx(&context);
return ret;
}
#else
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 183a85412155..8601fcb99f7a 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -176,6 +176,7 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
u32 len;
char *secctx;
struct lsmblob blob;
+ struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
ret = security_secid_to_secctx(&blob, &secctx, &len);
@@ -184,7 +185,8 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
seq_printf(s, "secctx=%s ", secctx);
- security_release_secctx(secctx, len);
+ lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
+ security_release_secctx(&context);
}
#else
static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index bfa7f12fde99..cc3ef03ee198 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -395,6 +395,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
enum ip_conntrack_info uninitialized_var(ctinfo);
struct nfnl_ct_hook *nfnl_ct;
bool csum_verify;
+ struct lsmcontext scaff; /* scaffolding */
char *secdata = NULL;
u32 seclen = 0;
@@ -625,8 +626,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}
nlh->nlmsg_len = skb->len;
- if (seclen)
- security_release_secctx(secdata, seclen);
+ if (seclen) {
+ lsmcontext_init(&scaff, secdata, seclen, 0);
+ security_release_secctx(&scaff);
+ }
return skb;
nla_put_failure:
@@ -634,8 +637,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
kfree_skb(skb);
net_err_ratelimited("nf_queue: error creating packet message\n");
nlmsg_failure:
- if (seclen)
- security_release_secctx(secdata, seclen);
+ if (seclen) {
+ lsmcontext_init(&scaff, secdata, seclen, 0);
+ security_release_secctx(&scaff);
+ }
return NULL;
}
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index e279b81d9545..288c005b44c7 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -373,6 +373,7 @@ int netlbl_unlhsh_add(struct net *net,
struct net_device *dev;
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
+ struct lsmcontext context;
char *secctx = NULL;
u32 secctx_len;
struct lsmblob blob;
@@ -443,7 +444,9 @@ int netlbl_unlhsh_add(struct net *net,
&secctx,
&secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
- security_release_secctx(secctx, secctx_len);
+ /* scaffolding */
+ lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
@@ -474,6 +477,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct netlbl_unlhsh_addr4 *entry;
struct audit_buffer *audit_buf;
struct net_device *dev;
+ struct lsmcontext context;
char *secctx;
u32 secctx_len;
struct lsmblob blob;
@@ -502,7 +506,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
security_secid_to_secctx(&blob,
&secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
- security_release_secctx(secctx, secctx_len);
+ /* scaffolding */
+ lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
audit_log_end(audit_buf);
@@ -539,6 +545,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct netlbl_unlhsh_addr6 *entry;
struct audit_buffer *audit_buf;
struct net_device *dev;
+ struct lsmcontext context;
char *secctx;
u32 secctx_len;
struct lsmblob blob;
@@ -566,7 +573,8 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
security_secid_to_secctx(&blob,
&secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
- security_release_secctx(secctx, secctx_len);
+ lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
audit_log_end(audit_buf);
@@ -1080,6 +1088,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
int ret_val = -ENOMEM;
struct netlbl_unlhsh_walk_arg *cb_arg = arg;
struct net_device *dev;
+ struct lsmcontext context;
void *data;
u32 secid;
char *secctx;
@@ -1147,7 +1156,9 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
NLBL_UNLABEL_A_SECCTX,
secctx_len,
secctx);
- security_release_secctx(secctx, secctx_len);
+ /* scaffolding */
+ lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_release_secctx(&context);
if (ret_val != 0)
goto list_cb_failure;
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index 893301ae0131..ef139d8ae7cd 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -84,6 +84,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
struct netlbl_audit *audit_info)
{
struct audit_buffer *audit_buf;
+ struct lsmcontext context;
char *secctx;
u32 secctx_len;
struct lsmblob blob;
@@ -103,7 +104,8 @@ struct audit_buffer *netlbl_audit_start_common(int type,
if (audit_info->secid != 0 &&
security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " subj=%s", secctx);
- security_release_secctx(secctx, secctx_len);
+ lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/
+ security_release_secctx(&context);
}
return audit_buf;
diff --git a/security/security.c b/security/security.c
index aaac748e4d83..6310ca7e84ed 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2144,17 +2144,23 @@ int security_secctx_to_secid(const char *secdata, u32 seclen,
}
EXPORT_SYMBOL(security_secctx_to_secid);
-void security_release_secctx(char *secdata, u32 seclen)
+void security_release_secctx(struct lsmcontext *cp)
{
struct security_hook_list *hp;
- int *display = current->security;
+ bool found = false;
hlist_for_each_entry(hp, &security_hook_heads.release_secctx, list)
- if (display == NULL || *display == LSMBLOB_INVALID ||
- *display == hp->lsmid->slot) {
- hp->hook.release_secctx(secdata, seclen);
- return;
+ if (cp->slot == hp->lsmid->slot) {
+ hp->hook.release_secctx(cp->context, cp->len);
+ found = true;
+ break;
}
+
+ memset(cp, 0, sizeof(*cp));
+
+ if (!found)
+ pr_warn("%s context \"%s\" from slot %d not released\n",
+ __func__, cp->context, cp->slot);
}
EXPORT_SYMBOL(security_release_secctx);
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 9737ead06b39..8e960f82bf3f 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4482,11 +4482,16 @@ static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
return 0;
}
-/*
- * There used to be a smack_release_secctx hook
- * that did nothing back when hooks were in a vector.
- * Now that there's a list such a hook adds cost.
+/**
+ * smack_release_secctx - do everything necessary to free a context
+ * @secdata: Unused
+ * @seclen: Unused
+ *
+ * Do nothing but hold a slot in the hooks list.
*/
+static void smack_release_secctx(char *secdata, u32 seclen)
+{
+}
static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
@@ -4729,6 +4734,7 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
+ LSM_HOOK_INIT(release_secctx, smack_release_secctx),
LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (6 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 18/25] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
` (2 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, netdev
Replace the (secctx,seclen) pointer pair with a single
lsmcontext pointer to allow return of the LSM identifier
along with the context and context length. This allows
security_release_secctx() to know how to release the
context. Callers have been modified to use or save the
returned data from the new structure.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
drivers/android/binder.c | 26 +++++++---------
include/linux/security.h | 4 +--
include/net/scm.h | 10 ++-----
kernel/audit.c | 29 +++++++-----------
kernel/auditsc.c | 31 +++++++------------
net/ipv4/ip_sockglue.c | 7 ++---
net/netfilter/nf_conntrack_netlink.c | 14 +++++----
net/netfilter/nf_conntrack_standalone.c | 7 ++---
net/netfilter/nfnetlink_queue.c | 5 +++-
net/netlabel/netlabel_unlabeled.c | 40 ++++++++-----------------
net/netlabel/netlabel_user.c | 7 ++---
security/security.c | 10 +++++--
12 files changed, 74 insertions(+), 116 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1bca4d589e87..3c5eee35aae6 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2859,9 +2859,7 @@ static void binder_transaction(struct binder_proc *proc,
binder_size_t last_fixup_min_off = 0;
struct binder_context *context = proc->context;
int t_debug_id = atomic_inc_return(&binder_last_id);
- char *secctx = NULL;
- u32 secctx_sz = 0;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext lsmctx = { };
e = binder_transaction_log_add(&binder_transaction_log);
e->debug_id = t_debug_id;
@@ -3109,14 +3107,14 @@ static void binder_transaction(struct binder_proc *proc,
size_t added_size;
security_task_getsecid(proc->tsk, &blob);
- ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
+ ret = security_secid_to_secctx(&blob, &lsmctx);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
return_error_line = __LINE__;
goto err_get_secctx_failed;
}
- added_size = ALIGN(secctx_sz, sizeof(u64));
+ added_size = ALIGN(lsmctx.len, sizeof(u64));
extra_buffers_size += added_size;
if (extra_buffers_size < added_size) {
/* integer overflow of extra_buffers_size */
@@ -3143,24 +3141,22 @@ static void binder_transaction(struct binder_proc *proc,
t->buffer = NULL;
goto err_binder_alloc_buf_failed;
}
- if (secctx) {
+ if (lsmctx.context) {
int err;
size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
ALIGN(tr->offsets_size, sizeof(void *)) +
ALIGN(extra_buffers_size, sizeof(void *)) -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
err = binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset,
- secctx, secctx_sz);
+ lsmctx.context, lsmctx.len);
if (err) {
t->security_ctx = 0;
WARN_ON(1);
}
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- secctx = NULL;
+ security_release_secctx(&lsmctx);
}
t->buffer->debug_id = t->debug_id;
t->buffer->transaction = t;
@@ -3216,7 +3212,7 @@ static void binder_transaction(struct binder_proc *proc,
off_end_offset = off_start_offset + tr->offsets_size;
sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
off_min = 0;
for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {
@@ -3492,10 +3488,8 @@ static void binder_transaction(struct binder_proc *proc,
binder_alloc_free_buf(&target_proc->alloc, t->buffer);
err_binder_alloc_buf_failed:
err_bad_extra_size:
- if (secctx) {
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmctx.context)
+ security_release_secctx(&lsmctx);
err_get_secctx_failed:
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
diff --git a/include/linux/security.h b/include/linux/security.h
index 597d9802b89b..00421941f683 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -530,7 +530,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
void security_release_secctx(struct lsmcontext *cp);
@@ -1335,7 +1335,7 @@ static inline int security_ismaclabel(const char *name)
}
static inline int security_secid_to_secctx(struct lsmblob *blob,
- char **secdata, u32 *seclen)
+ struct lsmcontext *cp)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index 30ba801c91bd..4a6ad8caf423 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -93,18 +93,14 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{
struct lsmcontext context;
- char *secdata;
- u32 seclen;
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(&scm->lsmblob, &secdata,
- &seclen);
+ err = security_secid_to_secctx(&scm->lsmblob, &context);
if (!err) {
- put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
- /*scaffolding*/
- lsmcontext_init(&context, secdata, seclen, 0);
+ put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
+ context.len, context.context);
security_release_secctx(&context);
}
}
diff --git a/kernel/audit.c b/kernel/audit.c
index 3305c4af43a8..224c7b4a1bc0 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1178,9 +1178,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
struct audit_sig_info *sig_data;
- char *ctx = NULL;
u32 len;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context = { };
err = audit_netlink_ok(skb, msg_type);
if (err)
@@ -1418,25 +1417,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_SIGNAL_INFO:
len = 0;
if (lsmblob_is_set(&audit_sig_lsm)) {
- err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
- &len);
+ err = security_secid_to_secctx(&audit_sig_lsm,
+ &context);
if (err)
return err;
}
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
if (!sig_data) {
- if (lsmblob_is_set(&audit_sig_lsm)) {
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmblob_is_set(&audit_sig_lsm))
+ security_release_secctx(&context);
return -ENOMEM;
}
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
if (lsmblob_is_set(&audit_sig_lsm)) {
- memcpy(sig_data->ctx, ctx, len);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ memcpy(sig_data->ctx, context.context, context.len);
+ security_release_secctx(&context);
}
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
sig_data, sizeof(*sig_data) + len);
@@ -2061,26 +2057,23 @@ void audit_log_key(struct audit_buffer *ab, char *key)
int audit_log_task_context(struct audit_buffer *ab)
{
- char *ctx = NULL;
- unsigned len;
int error;
struct lsmblob blob;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context;
security_task_getsecid(current, &blob);
if (!lsmblob_is_set(&blob))
return 0;
- error = security_secid_to_secctx(&blob, &ctx, &len);
+ error = security_secid_to_secctx(&blob, &context);
if (error) {
if (error != -EINVAL)
goto error_path;
return 0;
}
- audit_log_format(ab, " subj=%s", ctx);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ audit_log_format(ab, " subj=%s", context.context);
+ security_release_secctx(&context);
return 0;
error_path:
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8790e7aafa7d..6d273183dd87 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -962,9 +962,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
- struct lsmcontext lsmcxt;
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmctx;
int rc = 0;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
@@ -975,13 +973,12 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (lsmblob_is_set(blob)) {
- if (security_secid_to_secctx(blob, &ctx, &len)) {
+ if (security_secid_to_secctx(blob, &lsmctx)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
audit_log_format(ab, " ocomm=");
@@ -1194,7 +1191,6 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
static void show_special(struct audit_context *context, int *call_panic)
{
- struct lsmcontext lsmcxt;
struct audit_buffer *ab;
int i;
@@ -1218,17 +1214,15 @@ static void show_special(struct audit_context *context, int *call_panic)
from_kgid(&init_user_ns, context->ipc.gid),
context->ipc.mode);
if (osid) {
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmcxt;
struct lsmblob blob;
lsmblob_init(&blob, osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmcxt)) {
audit_log_format(ab, " osid=%u", osid);
*call_panic = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0);
+ audit_log_format(ab, " obj=%s", lsmcxt.context);
security_release_secctx(&lsmcxt);
}
}
@@ -1372,20 +1366,17 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
MAJOR(n->rdev),
MINOR(n->rdev));
if (n->osid != 0) {
- char *ctx = NULL;
- u32 len;
struct lsmblob blob;
- struct lsmcontext lsmcxt;
+ struct lsmcontext lsmctx;
lsmblob_init(&blob, n->osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmctx)) {
audit_log_format(ab, " osid=%u", n->osid);
if (call_panic)
*call_panic = 2;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 96d56a30ecca..27af7a6b8780 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -132,20 +132,17 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
struct lsmcontext context;
struct lsmblob lb;
- char *secdata;
- u32 seclen;
int err;
err = security_socket_getpeersec_dgram(NULL, skb, &lb);
if (err)
return;
- err = security_secid_to_secctx(&lb, &secdata, &seclen);
+ err = security_secid_to_secctx(&lb, &context);
if (err)
return;
- put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
- lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */
+ put_cmsg(msg, SOL_IP, SCM_SECURITY, context.len, context.context);
security_release_secctx(&context);
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 2f233f40c926..255bcb886a2f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -329,13 +329,12 @@ static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_secctx;
- int len, ret;
- char *secctx;
+ int ret;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
@@ -344,13 +343,12 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
if (!nest_secctx)
goto nla_put_failure;
- if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
+ if (nla_put_string(skb, CTA_SECCTX_NAME, context.context))
goto nla_put_failure;
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
return ret;
}
@@ -648,12 +646,16 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;
struct lsmblob blob;
+ struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, NULL, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
+ len = context.len;
+ security_release_secctx(&context);
+
return nla_total_size(0) /* CTA_SECCTX */
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
#else
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 8601fcb99f7a..8969754d7fe9 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -173,19 +173,16 @@ static void ct_seq_stop(struct seq_file *s, void *v)
static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
int ret;
- u32 len;
- char *secctx;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return;
- seq_printf(s, "secctx=%s ", secctx);
+ seq_printf(s, "secctx=%s ", context.context);
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
}
#else
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index cc3ef03ee198..2d6668fd026c 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -306,6 +306,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
struct lsmblob blob;
+ struct lsmcontext context = { };
if (!skb || !sk_fullsock(skb->sk))
return 0;
@@ -314,10 +315,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
if (skb->secmark) {
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, secdata, &seclen);
+ security_secid_to_secctx(&blob, &context);
+ *secdata = context.context;
}
read_unlock_bh(&skb->sk->sk_callback_lock);
+ seclen = context.len;
#endif
return seclen;
}
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 288c005b44c7..c03fe9a4f7b9 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -374,8 +374,6 @@ int netlbl_unlhsh_add(struct net *net,
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
struct lsmcontext context;
- char *secctx = NULL;
- u32 secctx_len;
struct lsmblob blob;
if (addr_len != sizeof(struct in_addr) &&
@@ -440,12 +438,9 @@ int netlbl_unlhsh_add(struct net *net,
rcu_read_unlock();
if (audit_buf != NULL) {
lsmblob_init(&blob, secid);
- if (security_secid_to_secctx(&blob,
- &secctx,
- &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ if (security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
@@ -478,8 +473,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -503,11 +496,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -546,8 +537,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -570,10 +559,9 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -1091,8 +1079,6 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
struct lsmcontext context;
void *data;
u32 secid;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
@@ -1149,15 +1135,13 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
}
lsmblob_init(&blob, secid);
- ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len);
+ ret_val = security_secid_to_secctx(&blob, &context);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_SECCTX,
- secctx_len,
- secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ context.len,
+ context.context);
security_release_secctx(&context);
if (ret_val != 0)
goto list_cb_failure;
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index ef139d8ae7cd..951ba0639d20 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -85,8 +85,6 @@ struct audit_buffer *netlbl_audit_start_common(int type,
{
struct audit_buffer *audit_buf;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
if (audit_enabled == AUDIT_OFF)
@@ -102,9 +100,8 @@ struct audit_buffer *netlbl_audit_start_common(int type,
lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " subj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " subj=%s", context.context);
security_release_secctx(&context);
}
diff --git a/security/security.c b/security/security.c
index 6310ca7e84ed..4ba1a6ed36e0 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2109,18 +2109,22 @@ int security_ismaclabel(const char *name)
}
EXPORT_SYMBOL(security_ismaclabel);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
{
struct security_hook_list *hp;
int display = lsm_task_display(current);
+ memset(cp, 0, sizeof(*cp));
+
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+ if (display == LSMBLOB_INVALID || display == hp->lsmid->slot) {
+ cp->slot = hp->lsmid->slot;
return hp->hook.secid_to_secctx(
blob->secid[hp->lsmid->slot],
- secdata, seclen);
+ &cp->context, &cp->len);
+ }
}
return 0;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 18/25] LSM: security_secid_to_secctx in netlink netfilter
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (7 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 21/25] Audit: Add subj_LSM fields when necessary Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 23/25] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, Kees Cook, John Johansen, netdev
Change netlink netfilter interfaces to use lsmcontext
pointers, and remove scaffolding.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
net/netfilter/nfnetlink_queue.c | 32 +++++++++++++-------------------
1 file changed, 13 insertions(+), 19 deletions(-)
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 2d6668fd026c..a1296453d8f2 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -301,12 +301,10 @@ static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
return -1;
}
-static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
+static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsmcontext *context)
{
- u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
struct lsmblob blob;
- struct lsmcontext context = { };
if (!skb || !sk_fullsock(skb->sk))
return 0;
@@ -314,15 +312,16 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->secmark) {
+ /* Any LSM might be looking for the secmark */
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, &context);
- *secdata = context.context;
+ security_secid_to_secctx(&blob, context);
}
read_unlock_bh(&skb->sk->sk_callback_lock);
- seclen = context.len;
+ return context->len;
+#else
+ return 0;
#endif
- return seclen;
}
static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
@@ -398,8 +397,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
enum ip_conntrack_info uninitialized_var(ctinfo);
struct nfnl_ct_hook *nfnl_ct;
bool csum_verify;
- struct lsmcontext scaff; /* scaffolding */
- char *secdata = NULL;
+ struct lsmcontext context = { };
u32 seclen = 0;
size = nlmsg_total_size(sizeof(struct nfgenmsg))
@@ -466,7 +464,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}
if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
- seclen = nfqnl_get_sk_secctx(entskb, &secdata);
+ seclen = nfqnl_get_sk_secctx(entskb, &context);
if (seclen)
size += nla_total_size(seclen);
}
@@ -601,7 +599,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
goto nla_put_failure;
- if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
+ if (seclen && nla_put(skb, NFQA_SECCTX, context.len, context.context))
goto nla_put_failure;
if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
@@ -629,10 +627,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}
nlh->nlmsg_len = skb->len;
- if (seclen) {
- lsmcontext_init(&scaff, secdata, seclen, 0);
- security_release_secctx(&scaff);
- }
+ if (seclen)
+ security_release_secctx(&context);
return skb;
nla_put_failure:
@@ -640,10 +636,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
kfree_skb(skb);
net_err_ratelimited("nf_queue: error creating packet message\n");
nlmsg_failure:
- if (seclen) {
- lsmcontext_init(&scaff, secdata, seclen, 0);
- security_release_secctx(&scaff);
- }
+ if (seclen)
+ security_release_secctx(&context);
return NULL;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 21/25] Audit: Add subj_LSM fields when necessary
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (8 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 18/25] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 23/25] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: netdev, linux-audit
Add record entries to identify subject data for all of the
security modules when there is more than one.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.com
cc: linux-audit@redhat.com
---
drivers/android/binder.c | 2 +-
include/linux/audit.h | 1 +
include/linux/security.h | 9 ++++-
include/net/scm.h | 3 +-
kernel/audit.c | 40 ++++++++++++++++++-
kernel/audit_fsnotify.c | 1 +
kernel/auditfilter.c | 1 +
kernel/auditsc.c | 10 +++--
net/ipv4/ip_sockglue.c | 2 +-
net/netfilter/nf_conntrack_netlink.c | 4 +-
net/netfilter/nf_conntrack_standalone.c | 2 +-
net/netfilter/nfnetlink_queue.c | 2 +-
net/netlabel/netlabel_unlabeled.c | 11 ++++--
net/netlabel/netlabel_user.c | 2 +-
net/xfrm/xfrm_policy.c | 2 +
net/xfrm/xfrm_state.c | 2 +
security/integrity/ima/ima_api.c | 1 +
security/integrity/integrity_audit.c | 1 +
security/security.c | 51 +++++++++++++++++++++++--
19 files changed, 124 insertions(+), 23 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 3c5eee35aae6..c9324c094888 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3107,7 +3107,7 @@ static void binder_transaction(struct binder_proc *proc,
size_t added_size;
security_task_getsecid(proc->tsk, &blob);
- ret = security_secid_to_secctx(&blob, &lsmctx);
+ ret = security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_DISPLAY);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
diff --git a/include/linux/audit.h b/include/linux/audit.h
index f9ceae57ca8d..2ce0e8da3922 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -161,6 +161,7 @@ extern void audit_log_path_denied(int type,
extern void audit_log_lost(const char *message);
extern int audit_log_task_context(struct audit_buffer *ab);
+extern void audit_log_task_lsms(struct audit_buffer *ab);
extern void audit_log_task_info(struct audit_buffer *ab);
extern int audit_update_lsm_rules(void);
diff --git a/include/linux/security.h b/include/linux/security.h
index d0fab9f5dddf..536db4dbfcbb 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -180,6 +180,8 @@ struct lsmblob {
#define LSMBLOB_INVALID -1 /* Not a valid LSM slot number */
#define LSMBLOB_NEEDED -2 /* Slot requested on initialization */
#define LSMBLOB_NOT_NEEDED -3 /* Slot not requested */
+#define LSMBLOB_DISPLAY -4 /* Use the "display" slot */
+#define LSMBLOB_FIRST -5 /* Use the default "display" slot */
/**
* lsmblob_init - initialize an lsmblob structure.
@@ -221,6 +223,8 @@ static inline bool lsmblob_equal(struct lsmblob *bloba, struct lsmblob *blobb)
return !memcmp(bloba, blobb, sizeof(*bloba));
}
+const char *security_lsm_slot_name(int slot);
+
/* These functions are in security/commoncap.c */
extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
int cap, unsigned int opts);
@@ -530,7 +534,8 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp,
+ int display);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
void security_release_secctx(struct lsmcontext *cp);
@@ -1334,7 +1339,7 @@ static inline int security_ismaclabel(const char *name)
}
static inline int security_secid_to_secctx(struct lsmblob *blob,
- struct lsmcontext *cp)
+ struct lsmcontext *cp, int display)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index 4a6ad8caf423..8b5a4737e1b8 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -96,7 +96,8 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(&scm->lsmblob, &context);
+ err = security_secid_to_secctx(&scm->lsmblob, &context,
+ LSMBLOB_DISPLAY);
if (!err) {
put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
diff --git a/kernel/audit.c b/kernel/audit.c
index 224c7b4a1bc0..d40f64a47c4b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -392,6 +392,7 @@ static int audit_log_config_change(char *function_name, u32 new, u32 old,
if (rc)
allow_changes = 0; /* Something weird, deny request */
audit_log_format(ab, " res=%d", allow_changes);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
return rc;
}
@@ -1097,6 +1098,7 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature
audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d",
audit_feature_names[which], !!old_feature, !!new_feature,
!!old_lock, !!new_lock, res);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
@@ -1347,6 +1349,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
size--;
audit_log_n_untrustedstring(ab, data, size);
}
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
break;
@@ -1361,6 +1364,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
msg_type == AUDIT_ADD_RULE ?
"add_rule" : "remove_rule",
audit_enabled);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
return -EPERM;
}
@@ -1374,6 +1378,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_common_recv_msg(audit_context(), &ab,
AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " op=trim res=1");
+ audit_log_task_lsms(ab);
audit_log_end(ab);
break;
case AUDIT_MAKE_EQUIV: {
@@ -1409,6 +1414,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_format(ab, " new=");
audit_log_untrustedstring(ab, new);
audit_log_format(ab, " res=%d", !err);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
kfree(old);
kfree(new);
@@ -1418,7 +1424,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
len = 0;
if (lsmblob_is_set(&audit_sig_lsm)) {
err = security_secid_to_secctx(&audit_sig_lsm,
- &context);
+ &context, LSMBLOB_FIRST);
if (err)
return err;
}
@@ -1477,6 +1483,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
" old-log_passwd=%d new-log_passwd=%d res=%d",
old.enabled, s.enabled, old.log_passwd,
s.log_passwd, !err);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
break;
}
@@ -2055,6 +2062,33 @@ void audit_log_key(struct audit_buffer *ab, char *key)
audit_log_format(ab, "(null)");
}
+void audit_log_task_lsms(struct audit_buffer *ab)
+{
+ int i;
+ const char *lsm;
+ struct lsmblob blob;
+ struct lsmcontext context;
+
+ /*
+ * Don't do anything unless there is more than one LSM
+ * with a security context to report.
+ */
+ if (security_lsm_slot_name(1) == NULL)
+ return;
+
+ security_task_getsecid(current, &blob);
+
+ for (i = 0; i < LSMBLOB_ENTRIES; i++) {
+ lsm = security_lsm_slot_name(i);
+ if (lsm == NULL)
+ break;
+ if (security_secid_to_secctx(&blob, &context, i))
+ continue;
+ audit_log_format(ab, " subj_%s=%s", lsm, context.context);
+ security_release_secctx(&context);
+ }
+}
+
int audit_log_task_context(struct audit_buffer *ab)
{
int error;
@@ -2065,7 +2099,7 @@ int audit_log_task_context(struct audit_buffer *ab)
if (!lsmblob_is_set(&blob))
return 0;
- error = security_secid_to_secctx(&blob, &context);
+ error = security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST);
if (error) {
if (error != -EINVAL)
goto error_path;
@@ -2173,6 +2207,7 @@ void audit_log_path_denied(int type, const char *operation)
audit_log_format(ab, "op=%s", operation);
audit_log_task_info(ab);
audit_log_format(ab, " res=0");
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
@@ -2223,6 +2258,7 @@ static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
oldsessionid, sessionid, !rc);
audit_put_tty(tty);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
index f0d243318452..7f8c4b1a2884 100644
--- a/kernel/audit_fsnotify.c
+++ b/kernel/audit_fsnotify.c
@@ -126,6 +126,7 @@ static void audit_mark_log_rule_change(struct audit_fsnotify_mark *audit_mark, c
audit_log_untrustedstring(ab, audit_mark->path);
audit_log_key(ab, rule->filterkey);
audit_log_format(ab, " list=%d res=1", rule->listnr);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 19cfbe716f9d..bf28bb599b6d 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1103,6 +1103,7 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
audit_log_format(ab, " op=%s", action);
audit_log_key(ab, rule->filterkey);
audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 6d273183dd87..e0dd643e9b13 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -973,7 +973,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (lsmblob_is_set(blob)) {
- if (security_secid_to_secctx(blob, &lsmctx)) {
+ if (security_secid_to_secctx(blob, &lsmctx, LSMBLOB_FIRST)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
@@ -1218,7 +1218,8 @@ static void show_special(struct audit_context *context, int *call_panic)
struct lsmblob blob;
lsmblob_init(&blob, osid);
- if (security_secid_to_secctx(&blob, &lsmcxt)) {
+ if (security_secid_to_secctx(&blob, &lsmcxt,
+ LSMBLOB_FIRST)) {
audit_log_format(ab, " osid=%u", osid);
*call_panic = 1;
} else {
@@ -1370,7 +1371,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
struct lsmcontext lsmctx;
lsmblob_init(&blob, n->osid);
- if (security_secid_to_secctx(&blob, &lsmctx)) {
+ if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) {
audit_log_format(ab, " osid=%u", n->osid);
if (call_panic)
*call_panic = 2;
@@ -1479,6 +1480,7 @@ static void audit_log_exit(void)
audit_log_task_info(ab);
audit_log_key(ab, context->filterkey);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
for (aux = context->aux; aux; aux = aux->next) {
@@ -2602,6 +2604,7 @@ void audit_core_dumps(long signr)
return;
audit_log_task(ab);
audit_log_format(ab, " sig=%ld res=1", signr);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
@@ -2628,6 +2631,7 @@ void audit_seccomp(unsigned long syscall, long signr, int code)
audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
signr, syscall_get_arch(current), syscall,
in_compat_syscall(), KSTK_EIP(current), code);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 27af7a6b8780..10b418029cdd 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -138,7 +138,7 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
if (err)
return;
- err = security_secid_to_secctx(&lb, &context);
+ err = security_secid_to_secctx(&lb, &context, LSMBLOB_DISPLAY);
if (err)
return;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 255bcb886a2f..b2f522b39a1a 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -334,7 +334,7 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &context);
+ ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY);
if (ret)
return 0;
@@ -649,7 +649,7 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &context);
+ ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY);
if (ret)
return 0;
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 8969754d7fe9..0ff2b8300c28 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -177,7 +177,7 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &context);
+ ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY);
if (ret)
return;
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index a1296453d8f2..b6f71be884e8 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -314,7 +314,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsmcontext *context)
if (skb->secmark) {
/* Any LSM might be looking for the secmark */
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, context);
+ security_secid_to_secctx(&blob, context, LSMBLOB_DISPLAY);
}
read_unlock_bh(&skb->sk->sk_callback_lock);
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 3b0f07b59436..60a7665de0e3 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -436,7 +436,8 @@ int netlbl_unlhsh_add(struct net *net,
unlhsh_add_return:
rcu_read_unlock();
if (audit_buf != NULL) {
- if (security_secid_to_secctx(lsmblob, &context) == 0) {
+ if (security_secid_to_secctx(lsmblob, &context,
+ LSMBLOB_FIRST) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -491,7 +492,8 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
if (dev != NULL)
dev_put(dev);
if (entry != NULL &&
- security_secid_to_secctx(&entry->lsmblob, &context) == 0) {
+ security_secid_to_secctx(&entry->lsmblob, &context,
+ LSMBLOB_FIRST) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -551,7 +553,8 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
if (dev != NULL)
dev_put(dev);
if (entry != NULL &&
- security_secid_to_secctx(&entry->lsmblob, &context) == 0) {
+ security_secid_to_secctx(&entry->lsmblob, &context,
+ LSMBLOB_FIRST) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -1122,7 +1125,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
lsmb = (struct lsmblob *)&addr6->lsmblob;
}
- ret_val = security_secid_to_secctx(lsmb, &context);
+ ret_val = security_secid_to_secctx(lsmb, &context, LSMBLOB_FIRST);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index 951ba0639d20..1941877fd16f 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -100,7 +100,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(&blob, &context) == 0) {
+ security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST) == 0) {
audit_log_format(audit_buf, " subj=%s", context.context);
security_release_secctx(&context);
}
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index f2d1e573ea55..bd2b36a83e66 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -4206,6 +4206,7 @@ void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
audit_log_format(audit_buf, " res=%u", result);
xfrm_audit_common_policyinfo(xp, audit_buf);
+ audit_log_task_lsms(audit_buf);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
@@ -4221,6 +4222,7 @@ void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
audit_log_format(audit_buf, " res=%u", result);
xfrm_audit_common_policyinfo(xp, audit_buf);
+ audit_log_task_lsms(audit_buf);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index f3423562d933..bfb8402cb28d 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2642,6 +2642,7 @@ void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
xfrm_audit_helper_sainfo(x, audit_buf);
audit_log_format(audit_buf, " res=%u", result);
+ audit_log_task_lsms(audit_buf);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
@@ -2656,6 +2657,7 @@ void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
xfrm_audit_helper_sainfo(x, audit_buf);
audit_log_format(audit_buf, " res=%u", result);
+ audit_log_task_lsms(audit_buf);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 1ab769fa7df6..252dc00700e8 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -363,6 +363,7 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
audit_log_format(ab, " hash=\"%s:%s\"", algo_name, hash);
audit_log_task_info(ab);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
iint->flags |= IMA_AUDITED;
diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
index 5109173839cc..bca89ae72e3d 100644
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -54,5 +54,6 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
audit_log_format(ab, " ino=%lu", inode->i_ino);
}
audit_log_format(ab, " res=%d", !result);
+ audit_log_task_lsms(ab);
audit_log_end(ab);
}
diff --git a/security/security.c b/security/security.c
index bca092dd4f00..d0b57a7c3b31 100644
--- a/security/security.c
+++ b/security/security.c
@@ -449,7 +449,31 @@ static int lsm_append(const char *new, char **result)
* Pointers to the LSM id structures for local use.
*/
static int lsm_slot __lsm_ro_after_init;
-static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES];
+static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES] __lsm_ro_after_init;
+
+/**
+ * security_lsm_slot_name - Get the name of the security module in a slot
+ * @slot: index into the "display" slot list.
+ *
+ * Provide the name of the security module associated with
+ * a display slot.
+ *
+ * If @slot is LSMBLOB_INVALID return the value
+ * for slot 0 if it has been set, otherwise NULL.
+ *
+ * Returns a pointer to the name string or NULL.
+ */
+const char *security_lsm_slot_name(int slot)
+{
+ if (slot == LSMBLOB_INVALID)
+ slot = 0;
+ else if (slot >= LSMBLOB_ENTRIES || slot < 0)
+ return NULL;
+
+ if (lsm_slotlist[slot] == NULL)
+ return NULL;
+ return lsm_slotlist[slot]->lsm;
+}
/**
* security_add_hooks - Add a modules hooks to the hook lists.
@@ -2159,13 +2183,32 @@ int security_ismaclabel(const char *name)
}
EXPORT_SYMBOL(security_ismaclabel);
-int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp,
+ int display)
{
struct security_hook_list *hp;
- int display = lsm_task_display(current);
memset(cp, 0, sizeof(*cp));
+ /*
+ * display either is the slot number use for formatting
+ * or an instruction on which relative slot to use.
+ */
+ if (display == LSMBLOB_DISPLAY)
+ display = lsm_task_display(current);
+ else if (display == LSMBLOB_FIRST)
+ display = LSMBLOB_INVALID;
+ else if (display < 0) {
+ WARN_ONCE(true,
+ "LSM: security_secid_to_secctx unknown display\n");
+ display = LSMBLOB_INVALID;
+ } else if (display >= lsm_slot) {
+ WARN_ONCE(true,
+ "LSM: security_secid_to_secctx invalid display\n");
+ display = LSMBLOB_INVALID;
+ }
+
+
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
@@ -2176,7 +2219,7 @@ int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
&cp->context, &cp->len);
}
}
- return 0;
+ return -EOPNOTSUPP;
}
EXPORT_SYMBOL(security_secid_to_secctx);
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 23/25] NET: Add SO_PEERCONTEXT for multiple LSMs
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
` (9 preceding siblings ...)
2019-12-24 23:13 ` [PATCH v12 21/25] Audit: Add subj_LSM fields when necessary Casey Schaufler
@ 2019-12-24 23:13 ` Casey Schaufler
10 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:13 UTC (permalink / raw)
To: casey.schaufler; +Cc: casey, netdev
The getsockopt SO_PEERSEC provides the LSM based security
information for a single module, but for reasons of backward
compatibility cannot include the information for multiple
modules. A new option SO_PEERCONTEXT is added to report the
security "context" of multiple modules using a "compound" format
lsm1\0value\0lsm2\0value\0
This is expected to be used by system services, including dbus-daemon.
The exact format of a compound context has been the subject of
considerable debate. This format was suggested by Simon McVittie,
a dbus maintainer with a significant stake in the format being
usable.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
arch/alpha/include/uapi/asm/socket.h | 1 +
arch/mips/include/uapi/asm/socket.h | 1 +
arch/parisc/include/uapi/asm/socket.h | 1 +
arch/sparc/include/uapi/asm/socket.h | 1 +
include/linux/lsm_hooks.h | 9 +-
include/linux/security.h | 11 ++-
include/uapi/asm-generic/socket.h | 1 +
kernel/audit.c | 4 +-
net/core/sock.c | 7 +-
net/netlabel/netlabel_unlabeled.c | 9 +-
net/netlabel/netlabel_user.c | 2 +-
security/apparmor/lsm.c | 20 ++---
security/security.c | 118 +++++++++++++++++++++++---
security/selinux/hooks.c | 20 ++---
security/smack/smack_lsm.c | 31 +++----
15 files changed, 164 insertions(+), 72 deletions(-)
diff --git a/arch/alpha/include/uapi/asm/socket.h b/arch/alpha/include/uapi/asm/socket.h
index de6c4df61082..b26fb34e4226 100644
--- a/arch/alpha/include/uapi/asm/socket.h
+++ b/arch/alpha/include/uapi/asm/socket.h
@@ -123,6 +123,7 @@
#define SO_SNDTIMEO_NEW 67
#define SO_DETACH_REUSEPORT_BPF 68
+#define SO_PEERCONTEXT 69
#if !defined(__KERNEL__)
diff --git a/arch/mips/include/uapi/asm/socket.h b/arch/mips/include/uapi/asm/socket.h
index d0a9ed2ca2d6..10e03507b1ed 100644
--- a/arch/mips/include/uapi/asm/socket.h
+++ b/arch/mips/include/uapi/asm/socket.h
@@ -134,6 +134,7 @@
#define SO_SNDTIMEO_NEW 67
#define SO_DETACH_REUSEPORT_BPF 68
+#define SO_PEERCONTEXT 69
#if !defined(__KERNEL__)
diff --git a/arch/parisc/include/uapi/asm/socket.h b/arch/parisc/include/uapi/asm/socket.h
index 10173c32195e..e11df59a84d1 100644
--- a/arch/parisc/include/uapi/asm/socket.h
+++ b/arch/parisc/include/uapi/asm/socket.h
@@ -115,6 +115,7 @@
#define SO_SNDTIMEO_NEW 0x4041
#define SO_DETACH_REUSEPORT_BPF 0x4042
+#define SO_PEERCONTEXT 0x4043
#if !defined(__KERNEL__)
diff --git a/arch/sparc/include/uapi/asm/socket.h b/arch/sparc/include/uapi/asm/socket.h
index 8029b681fc7c..5b41ef778040 100644
--- a/arch/sparc/include/uapi/asm/socket.h
+++ b/arch/sparc/include/uapi/asm/socket.h
@@ -116,6 +116,7 @@
#define SO_SNDTIMEO_NEW 0x0045
#define SO_DETACH_REUSEPORT_BPF 0x0047
+#define SO_PEERCONTEXT 0x0048
#if !defined(__KERNEL__)
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 2bf82e1cf347..2ae10e7f81a7 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -880,8 +880,8 @@
* SO_GETPEERSEC. For tcp sockets this can be meaningful if the
* socket is associated with an ipsec SA.
* @sock is the local socket.
- * @optval userspace memory where the security state is to be copied.
- * @optlen userspace int where the module should copy the actual length
+ * @optval memory where the security state is to be copied.
+ * @optlen int where the module should copy the actual length
* of the security state.
* @len as input is the maximum length to copy to userspace provided
* by the caller.
@@ -1724,9 +1724,8 @@ union security_list_options {
int (*socket_setsockopt)(struct socket *sock, int level, int optname);
int (*socket_shutdown)(struct socket *sock, int how);
int (*socket_sock_rcv_skb)(struct sock *sk, struct sk_buff *skb);
- int (*socket_getpeersec_stream)(struct socket *sock,
- char __user *optval,
- int __user *optlen, unsigned len);
+ int (*socket_getpeersec_stream)(struct socket *sock, char **optval,
+ int *optlen, unsigned len);
int (*socket_getpeersec_dgram)(struct socket *sock,
struct sk_buff *skb, u32 *secid);
int (*sk_alloc_security)(struct sock *sk, int family, gfp_t priority);
diff --git a/include/linux/security.h b/include/linux/security.h
index 536db4dbfcbb..b72bb90b1903 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -181,7 +181,7 @@ struct lsmblob {
#define LSMBLOB_NEEDED -2 /* Slot requested on initialization */
#define LSMBLOB_NOT_NEEDED -3 /* Slot not requested */
#define LSMBLOB_DISPLAY -4 /* Use the "display" slot */
-#define LSMBLOB_FIRST -5 /* Use the default "display" slot */
+#define LSMBLOB_COMPOUND -5 /* A compound "display" */
/**
* lsmblob_init - initialize an lsmblob structure.
@@ -1400,7 +1400,8 @@ int security_socket_setsockopt(struct socket *sock, int level, int optname);
int security_socket_shutdown(struct socket *sock, int how);
int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb);
int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
- int __user *optlen, unsigned len);
+ int __user *optlen, unsigned len,
+ int display);
int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
struct lsmblob *blob);
int security_sk_alloc(struct sock *sk, int family, gfp_t priority);
@@ -1534,8 +1535,10 @@ static inline int security_sock_rcv_skb(struct sock *sk,
return 0;
}
-static inline int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
- int __user *optlen, unsigned len)
+static inline int security_socket_getpeersec_stream(struct socket *sock,
+ char __user *optval,
+ int __user *optlen,
+ unsigned len, int display)
{
return -ENOPROTOOPT;
}
diff --git a/include/uapi/asm-generic/socket.h b/include/uapi/asm-generic/socket.h
index 77f7c1638eb1..e3a853d53705 100644
--- a/include/uapi/asm-generic/socket.h
+++ b/include/uapi/asm-generic/socket.h
@@ -118,6 +118,7 @@
#define SO_SNDTIMEO_NEW 67
#define SO_DETACH_REUSEPORT_BPF 68
+#define SO_PEERCONTEXT 69
#if !defined(__KERNEL__)
diff --git a/kernel/audit.c b/kernel/audit.c
index d40f64a47c4b..71151ba2a6c2 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1424,7 +1424,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
len = 0;
if (lsmblob_is_set(&audit_sig_lsm)) {
err = security_secid_to_secctx(&audit_sig_lsm,
- &context, LSMBLOB_FIRST);
+ &context, 0);
if (err)
return err;
}
@@ -2099,7 +2099,7 @@ int audit_log_task_context(struct audit_buffer *ab)
if (!lsmblob_is_set(&blob))
return 0;
- error = security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST);
+ error = security_secid_to_secctx(&blob, &context, 0);
if (error) {
if (error != -EINVAL)
goto error_path;
diff --git a/net/core/sock.c b/net/core/sock.c
index 043db3ce023e..63b7eda81a90 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1411,7 +1411,12 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
break;
case SO_PEERSEC:
- return security_socket_getpeersec_stream(sock, optval, optlen, len);
+ return security_socket_getpeersec_stream(sock, optval, optlen,
+ len, LSMBLOB_DISPLAY);
+
+ case SO_PEERCONTEXT:
+ return security_socket_getpeersec_stream(sock, optval, optlen,
+ len, LSMBLOB_COMPOUND);
case SO_MARK:
v.val = sk->sk_mark;
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 60a7665de0e3..fefd1f2d26f8 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -436,8 +436,7 @@ int netlbl_unlhsh_add(struct net *net,
unlhsh_add_return:
rcu_read_unlock();
if (audit_buf != NULL) {
- if (security_secid_to_secctx(lsmblob, &context,
- LSMBLOB_FIRST) == 0) {
+ if (security_secid_to_secctx(lsmblob, &context, 0) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -493,7 +492,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
dev_put(dev);
if (entry != NULL &&
security_secid_to_secctx(&entry->lsmblob, &context,
- LSMBLOB_FIRST) == 0) {
+ 0) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -554,7 +553,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
dev_put(dev);
if (entry != NULL &&
security_secid_to_secctx(&entry->lsmblob, &context,
- LSMBLOB_FIRST) == 0) {
+ 0) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -1125,7 +1124,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
lsmb = (struct lsmblob *)&addr6->lsmblob;
}
- ret_val = security_secid_to_secctx(lsmb, &context, LSMBLOB_FIRST);
+ ret_val = security_secid_to_secctx(lsmb, &context, 0);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index 1941877fd16f..537c0bf25e3c 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -100,7 +100,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST) == 0) {
+ security_secid_to_secctx(&blob, &context, 0) == 0) {
audit_log_format(audit_buf, " subj=%s", context.context);
security_release_secctx(&context);
}
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 16b992235c11..34edfd29c32f 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1078,10 +1078,8 @@ static struct aa_label *sk_peer_label(struct sock *sk)
*
* Note: for tcp only valid if using ipsec or cipso on lan
*/
-static int apparmor_socket_getpeersec_stream(struct socket *sock,
- char __user *optval,
- int __user *optlen,
- unsigned int len)
+static int apparmor_socket_getpeersec_stream(struct socket *sock, char **optval,
+ int *optlen, unsigned int len)
{
char *name;
int slen, error = 0;
@@ -1101,17 +1099,11 @@ static int apparmor_socket_getpeersec_stream(struct socket *sock,
if (slen < 0) {
error = -ENOMEM;
} else {
- if (slen > len) {
+ if (slen > len)
error = -ERANGE;
- } else if (copy_to_user(optval, name, slen)) {
- error = -EFAULT;
- goto out;
- }
- if (put_user(slen, optlen))
- error = -EFAULT;
-out:
- kfree(name);
-
+ else
+ *optval = name;
+ *optlen = slen;
}
done:
diff --git a/security/security.c b/security/security.c
index d0b57a7c3b31..1afe245f3246 100644
--- a/security/security.c
+++ b/security/security.c
@@ -723,6 +723,42 @@ static void __init lsm_early_task(struct task_struct *task)
panic("%s: Early task alloc failed.\n", __func__);
}
+/**
+ * append_ctx - append a lsm/context pair to a compound context
+ * @ctx: the existing compound context
+ * @ctxlen: size of the old context, including terminating nul byte
+ * @lsm: new lsm name, nul terminated
+ * @new: new context, possibly nul terminated
+ * @newlen: maximum size of @new
+ *
+ * replace @ctx with a new compound context, appending @newlsm and @new
+ * to @ctx. On exit the new data replaces the old, which is freed.
+ * @ctxlen is set to the new size, which includes a trailing nul byte.
+ *
+ * Returns 0 on success, -ENOMEM if no memory is available.
+ */
+static int append_ctx(char **ctx, int *ctxlen, const char *lsm, char *new,
+ int newlen)
+{
+ char *final;
+ int llen;
+
+ llen = strlen(lsm) + 1;
+ newlen = strnlen(new, newlen) + 1;
+
+ final = kzalloc(*ctxlen + llen + newlen, GFP_KERNEL);
+ if (final == NULL)
+ return -ENOMEM;
+ if (*ctxlen)
+ memcpy(final, *ctx, *ctxlen);
+ memcpy(final + *ctxlen, lsm, llen);
+ memcpy(final + *ctxlen + llen, new, newlen);
+ kfree(*ctx);
+ *ctx = final;
+ *ctxlen = *ctxlen + llen + newlen;
+ return 0;
+}
+
/*
* Hook list operation macros.
*
@@ -2164,8 +2200,8 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
continue;
- if (lsm == NULL && *display != LSMBLOB_INVALID &&
- *display != hp->lsmid->slot)
+ if (lsm == NULL && display != NULL &&
+ *display != LSMBLOB_INVALID && *display != hp->lsmid->slot)
continue;
return hp->hook.setprocattr(name, value, size);
}
@@ -2196,7 +2232,7 @@ int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp,
*/
if (display == LSMBLOB_DISPLAY)
display = lsm_task_display(current);
- else if (display == LSMBLOB_FIRST)
+ else if (display == 0)
display = LSMBLOB_INVALID;
else if (display < 0) {
WARN_ONCE(true,
@@ -2246,6 +2282,15 @@ void security_release_secctx(struct lsmcontext *cp)
struct security_hook_list *hp;
bool found = false;
+ if (cp->slot == LSMBLOB_INVALID)
+ return;
+
+ if (cp->slot == LSMBLOB_COMPOUND) {
+ kfree(cp->context);
+ found = true;
+ goto clear_out;
+ }
+
hlist_for_each_entry(hp, &security_hook_heads.release_secctx, list)
if (cp->slot == hp->lsmid->slot) {
hp->hook.release_secctx(cp->context, cp->len);
@@ -2253,6 +2298,7 @@ void security_release_secctx(struct lsmcontext *cp)
break;
}
+clear_out:
memset(cp, 0, sizeof(*cp));
if (!found)
@@ -2389,17 +2435,67 @@ int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
EXPORT_SYMBOL(security_sock_rcv_skb);
int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
- int __user *optlen, unsigned len)
+ int __user *optlen, unsigned len,
+ int display)
{
- int display = lsm_task_display(current);
struct security_hook_list *hp;
+ char *final = NULL;
+ char *cp;
+ int rc = 0;
+ unsigned finallen = 0;
+ unsigned clen = 0;
- hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_stream,
- list)
- if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
- return hp->hook.socket_getpeersec_stream(sock, optval,
- optlen, len);
- return -ENOPROTOOPT;
+ switch (display) {
+ case LSMBLOB_DISPLAY:
+ rc = -ENOPROTOOPT;
+ display = lsm_task_display(current);
+ hlist_for_each_entry(hp,
+ &security_hook_heads.socket_getpeersec_stream,
+ list)
+ if (display == LSMBLOB_INVALID ||
+ display == hp->lsmid->slot) {
+ rc = hp->hook.socket_getpeersec_stream(sock,
+ &final, &finallen, len);
+ break;
+ }
+ break;
+ case LSMBLOB_COMPOUND:
+ /*
+ * A compound context, in the form [lsm\0value\0]...
+ */
+ hlist_for_each_entry(hp,
+ &security_hook_heads.socket_getpeersec_stream,
+ list) {
+ rc = hp->hook.socket_getpeersec_stream(sock, &cp, &clen,
+ len);
+ if (rc == -EINVAL || rc == -ENOPROTOOPT) {
+ rc = 0;
+ continue;
+ }
+ if (rc) {
+ kfree(final);
+ return rc;
+ }
+ rc = append_ctx(&final, &finallen, hp->lsmid->lsm,
+ cp, clen);
+ }
+ if (final == NULL)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (finallen > len)
+ rc = -ERANGE;
+ else if (copy_to_user(optval, final, finallen))
+ rc = -EFAULT;
+
+ if (put_user(finallen, optlen))
+ rc = -EFAULT;
+
+ kfree(final);
+ return rc;
}
int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index cd4743331800..c3e6fd3f8c56 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -5056,10 +5056,8 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
return err;
}
-static int selinux_socket_getpeersec_stream(struct socket *sock,
- char __user *optval,
- int __user *optlen,
- unsigned int len)
+static int selinux_socket_getpeersec_stream(struct socket *sock, char **optval,
+ int *optlen, unsigned int len)
{
int err = 0;
char *scontext;
@@ -5079,18 +5077,12 @@ static int selinux_socket_getpeersec_stream(struct socket *sock,
if (err)
return err;
- if (scontext_len > len) {
+ if (scontext_len > len)
err = -ERANGE;
- goto out_len;
- }
-
- if (copy_to_user(optval, scontext, scontext_len))
- err = -EFAULT;
+ else
+ *optval = scontext;
-out_len:
- if (put_user(scontext_len, optlen))
- err = -EFAULT;
- kfree(scontext);
+ *optlen = scontext_len;
return err;
}
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 7349ce263759..7d449188ca16 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3957,28 +3957,29 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
*
* returns zero on success, an error code otherwise
*/
-static int smack_socket_getpeersec_stream(struct socket *sock,
- char __user *optval,
- int __user *optlen, unsigned len)
+static int smack_socket_getpeersec_stream(struct socket *sock, char **optval,
+ int *optlen, unsigned len)
{
- struct socket_smack *ssp;
- char *rcp = "";
- int slen = 1;
+ struct socket_smack *ssp = smack_sock(sock->sk);
+ char *rcp;
+ int slen;
int rc = 0;
- ssp = smack_sock(sock->sk);
- if (ssp->smk_packet != NULL) {
- rcp = ssp->smk_packet->smk_known;
- slen = strlen(rcp) + 1;
+ if (ssp->smk_packet == NULL) {
+ *optlen = 0;
+ return -EINVAL;
}
+ rcp = ssp->smk_packet->smk_known;
+ slen = strlen(rcp) + 1;
if (slen > len)
rc = -ERANGE;
- else if (copy_to_user(optval, rcp, slen) != 0)
- rc = -EFAULT;
-
- if (put_user(slen, optlen) != 0)
- rc = -EFAULT;
+ else {
+ *optval = kstrdup(rcp, GFP_KERNEL);
+ if (*optval == NULL)
+ rc = -ENOMEM;
+ }
+ *optlen = slen;
return rc;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx
2019-12-24 23:18 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
@ 2019-12-24 23:19 ` Casey Schaufler
0 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-24 23:19 UTC (permalink / raw)
To: casey.schaufler, jmorris, linux-security-module, selinux
Cc: casey, keescook, john.johansen, penguin-kernel, paul, sds
Replace the (secctx,seclen) pointer pair with a single
lsmcontext pointer to allow return of the LSM identifier
along with the context and context length. This allows
security_release_secctx() to know how to release the
context. Callers have been modified to use or save the
returned data from the new structure.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
drivers/android/binder.c | 26 +++++++---------
include/linux/security.h | 4 +--
include/net/scm.h | 10 ++-----
kernel/audit.c | 29 +++++++-----------
kernel/auditsc.c | 31 +++++++------------
net/ipv4/ip_sockglue.c | 7 ++---
net/netfilter/nf_conntrack_netlink.c | 14 +++++----
net/netfilter/nf_conntrack_standalone.c | 7 ++---
net/netfilter/nfnetlink_queue.c | 5 +++-
net/netlabel/netlabel_unlabeled.c | 40 ++++++++-----------------
net/netlabel/netlabel_user.c | 7 ++---
security/security.c | 10 +++++--
12 files changed, 74 insertions(+), 116 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1bca4d589e87..3c5eee35aae6 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2859,9 +2859,7 @@ static void binder_transaction(struct binder_proc *proc,
binder_size_t last_fixup_min_off = 0;
struct binder_context *context = proc->context;
int t_debug_id = atomic_inc_return(&binder_last_id);
- char *secctx = NULL;
- u32 secctx_sz = 0;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext lsmctx = { };
e = binder_transaction_log_add(&binder_transaction_log);
e->debug_id = t_debug_id;
@@ -3109,14 +3107,14 @@ static void binder_transaction(struct binder_proc *proc,
size_t added_size;
security_task_getsecid(proc->tsk, &blob);
- ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
+ ret = security_secid_to_secctx(&blob, &lsmctx);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
return_error_line = __LINE__;
goto err_get_secctx_failed;
}
- added_size = ALIGN(secctx_sz, sizeof(u64));
+ added_size = ALIGN(lsmctx.len, sizeof(u64));
extra_buffers_size += added_size;
if (extra_buffers_size < added_size) {
/* integer overflow of extra_buffers_size */
@@ -3143,24 +3141,22 @@ static void binder_transaction(struct binder_proc *proc,
t->buffer = NULL;
goto err_binder_alloc_buf_failed;
}
- if (secctx) {
+ if (lsmctx.context) {
int err;
size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
ALIGN(tr->offsets_size, sizeof(void *)) +
ALIGN(extra_buffers_size, sizeof(void *)) -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
err = binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset,
- secctx, secctx_sz);
+ lsmctx.context, lsmctx.len);
if (err) {
t->security_ctx = 0;
WARN_ON(1);
}
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- secctx = NULL;
+ security_release_secctx(&lsmctx);
}
t->buffer->debug_id = t->debug_id;
t->buffer->transaction = t;
@@ -3216,7 +3212,7 @@ static void binder_transaction(struct binder_proc *proc,
off_end_offset = off_start_offset + tr->offsets_size;
sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
off_min = 0;
for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {
@@ -3492,10 +3488,8 @@ static void binder_transaction(struct binder_proc *proc,
binder_alloc_free_buf(&target_proc->alloc, t->buffer);
err_binder_alloc_buf_failed:
err_bad_extra_size:
- if (secctx) {
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmctx.context)
+ security_release_secctx(&lsmctx);
err_get_secctx_failed:
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
diff --git a/include/linux/security.h b/include/linux/security.h
index 597d9802b89b..00421941f683 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -530,7 +530,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
void security_release_secctx(struct lsmcontext *cp);
@@ -1335,7 +1335,7 @@ static inline int security_ismaclabel(const char *name)
}
static inline int security_secid_to_secctx(struct lsmblob *blob,
- char **secdata, u32 *seclen)
+ struct lsmcontext *cp)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index 30ba801c91bd..4a6ad8caf423 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -93,18 +93,14 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{
struct lsmcontext context;
- char *secdata;
- u32 seclen;
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(&scm->lsmblob, &secdata,
- &seclen);
+ err = security_secid_to_secctx(&scm->lsmblob, &context);
if (!err) {
- put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
- /*scaffolding*/
- lsmcontext_init(&context, secdata, seclen, 0);
+ put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
+ context.len, context.context);
security_release_secctx(&context);
}
}
diff --git a/kernel/audit.c b/kernel/audit.c
index 3305c4af43a8..224c7b4a1bc0 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1178,9 +1178,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
struct audit_sig_info *sig_data;
- char *ctx = NULL;
u32 len;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context = { };
err = audit_netlink_ok(skb, msg_type);
if (err)
@@ -1418,25 +1417,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_SIGNAL_INFO:
len = 0;
if (lsmblob_is_set(&audit_sig_lsm)) {
- err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
- &len);
+ err = security_secid_to_secctx(&audit_sig_lsm,
+ &context);
if (err)
return err;
}
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
if (!sig_data) {
- if (lsmblob_is_set(&audit_sig_lsm)) {
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmblob_is_set(&audit_sig_lsm))
+ security_release_secctx(&context);
return -ENOMEM;
}
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
if (lsmblob_is_set(&audit_sig_lsm)) {
- memcpy(sig_data->ctx, ctx, len);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ memcpy(sig_data->ctx, context.context, context.len);
+ security_release_secctx(&context);
}
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
sig_data, sizeof(*sig_data) + len);
@@ -2061,26 +2057,23 @@ void audit_log_key(struct audit_buffer *ab, char *key)
int audit_log_task_context(struct audit_buffer *ab)
{
- char *ctx = NULL;
- unsigned len;
int error;
struct lsmblob blob;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context;
security_task_getsecid(current, &blob);
if (!lsmblob_is_set(&blob))
return 0;
- error = security_secid_to_secctx(&blob, &ctx, &len);
+ error = security_secid_to_secctx(&blob, &context);
if (error) {
if (error != -EINVAL)
goto error_path;
return 0;
}
- audit_log_format(ab, " subj=%s", ctx);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ audit_log_format(ab, " subj=%s", context.context);
+ security_release_secctx(&context);
return 0;
error_path:
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8790e7aafa7d..6d273183dd87 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -962,9 +962,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
- struct lsmcontext lsmcxt;
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmctx;
int rc = 0;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
@@ -975,13 +973,12 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (lsmblob_is_set(blob)) {
- if (security_secid_to_secctx(blob, &ctx, &len)) {
+ if (security_secid_to_secctx(blob, &lsmctx)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
audit_log_format(ab, " ocomm=");
@@ -1194,7 +1191,6 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
static void show_special(struct audit_context *context, int *call_panic)
{
- struct lsmcontext lsmcxt;
struct audit_buffer *ab;
int i;
@@ -1218,17 +1214,15 @@ static void show_special(struct audit_context *context, int *call_panic)
from_kgid(&init_user_ns, context->ipc.gid),
context->ipc.mode);
if (osid) {
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmcxt;
struct lsmblob blob;
lsmblob_init(&blob, osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmcxt)) {
audit_log_format(ab, " osid=%u", osid);
*call_panic = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0);
+ audit_log_format(ab, " obj=%s", lsmcxt.context);
security_release_secctx(&lsmcxt);
}
}
@@ -1372,20 +1366,17 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
MAJOR(n->rdev),
MINOR(n->rdev));
if (n->osid != 0) {
- char *ctx = NULL;
- u32 len;
struct lsmblob blob;
- struct lsmcontext lsmcxt;
+ struct lsmcontext lsmctx;
lsmblob_init(&blob, n->osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmctx)) {
audit_log_format(ab, " osid=%u", n->osid);
if (call_panic)
*call_panic = 2;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 96d56a30ecca..27af7a6b8780 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -132,20 +132,17 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
struct lsmcontext context;
struct lsmblob lb;
- char *secdata;
- u32 seclen;
int err;
err = security_socket_getpeersec_dgram(NULL, skb, &lb);
if (err)
return;
- err = security_secid_to_secctx(&lb, &secdata, &seclen);
+ err = security_secid_to_secctx(&lb, &context);
if (err)
return;
- put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
- lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */
+ put_cmsg(msg, SOL_IP, SCM_SECURITY, context.len, context.context);
security_release_secctx(&context);
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 2f233f40c926..255bcb886a2f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -329,13 +329,12 @@ static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_secctx;
- int len, ret;
- char *secctx;
+ int ret;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
@@ -344,13 +343,12 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
if (!nest_secctx)
goto nla_put_failure;
- if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
+ if (nla_put_string(skb, CTA_SECCTX_NAME, context.context))
goto nla_put_failure;
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
return ret;
}
@@ -648,12 +646,16 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;
struct lsmblob blob;
+ struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, NULL, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
+ len = context.len;
+ security_release_secctx(&context);
+
return nla_total_size(0) /* CTA_SECCTX */
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
#else
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 8601fcb99f7a..8969754d7fe9 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -173,19 +173,16 @@ static void ct_seq_stop(struct seq_file *s, void *v)
static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
int ret;
- u32 len;
- char *secctx;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return;
- seq_printf(s, "secctx=%s ", secctx);
+ seq_printf(s, "secctx=%s ", context.context);
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
}
#else
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index cc3ef03ee198..2d6668fd026c 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -306,6 +306,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
struct lsmblob blob;
+ struct lsmcontext context = { };
if (!skb || !sk_fullsock(skb->sk))
return 0;
@@ -314,10 +315,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
if (skb->secmark) {
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, secdata, &seclen);
+ security_secid_to_secctx(&blob, &context);
+ *secdata = context.context;
}
read_unlock_bh(&skb->sk->sk_callback_lock);
+ seclen = context.len;
#endif
return seclen;
}
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 288c005b44c7..c03fe9a4f7b9 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -374,8 +374,6 @@ int netlbl_unlhsh_add(struct net *net,
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
struct lsmcontext context;
- char *secctx = NULL;
- u32 secctx_len;
struct lsmblob blob;
if (addr_len != sizeof(struct in_addr) &&
@@ -440,12 +438,9 @@ int netlbl_unlhsh_add(struct net *net,
rcu_read_unlock();
if (audit_buf != NULL) {
lsmblob_init(&blob, secid);
- if (security_secid_to_secctx(&blob,
- &secctx,
- &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ if (security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
@@ -478,8 +473,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -503,11 +496,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -546,8 +537,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -570,10 +559,9 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -1091,8 +1079,6 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
struct lsmcontext context;
void *data;
u32 secid;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
@@ -1149,15 +1135,13 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
}
lsmblob_init(&blob, secid);
- ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len);
+ ret_val = security_secid_to_secctx(&blob, &context);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_SECCTX,
- secctx_len,
- secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ context.len,
+ context.context);
security_release_secctx(&context);
if (ret_val != 0)
goto list_cb_failure;
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index ef139d8ae7cd..951ba0639d20 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -85,8 +85,6 @@ struct audit_buffer *netlbl_audit_start_common(int type,
{
struct audit_buffer *audit_buf;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
if (audit_enabled == AUDIT_OFF)
@@ -102,9 +100,8 @@ struct audit_buffer *netlbl_audit_start_common(int type,
lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " subj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " subj=%s", context.context);
security_release_secctx(&context);
}
diff --git a/security/security.c b/security/security.c
index 6310ca7e84ed..4ba1a6ed36e0 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2109,18 +2109,22 @@ int security_ismaclabel(const char *name)
}
EXPORT_SYMBOL(security_ismaclabel);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
{
struct security_hook_list *hp;
int display = lsm_task_display(current);
+ memset(cp, 0, sizeof(*cp));
+
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+ if (display == LSMBLOB_INVALID || display == hp->lsmid->slot) {
+ cp->slot = hp->lsmid->slot;
return hp->hook.secid_to_secctx(
blob->secid[hp->lsmid->slot],
- secdata, seclen);
+ &cp->context, &cp->len);
+ }
}
return 0;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* Re: [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx
2019-12-16 22:36 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-12-18 16:06 ` Stephen Smalley
@ 2019-12-18 19:33 ` Stephen Smalley
1 sibling, 0 replies; 17+ messages in thread
From: Stephen Smalley @ 2019-12-18 19:33 UTC (permalink / raw)
To: Casey Schaufler, casey.schaufler, jmorris, linux-security-module,
selinux
Cc: keescook, john.johansen, penguin-kernel, paul
On 12/16/19 5:36 PM, Casey Schaufler wrote:
> Replace the (secctx,seclen) pointer pair with a single
> lsmcontext pointer to allow return of the LSM identifier
> along with the context and context length. This allows
> security_release_secctx() to know how to release the
> context. Callers have been modified to use or save the
> returned data from the new structure.
>
> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
> cc: netdev@vger.kernel.org
Sorry, have to retract my ack. See below.
> ---
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 3305c4af43a8..224c7b4a1bc0 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -1178,9 +1178,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> struct audit_buffer *ab;
> u16 msg_type = nlh->nlmsg_type;
> struct audit_sig_info *sig_data;
> - char *ctx = NULL;
> u32 len;
> - struct lsmcontext scaff; /* scaffolding */
> + struct lsmcontext context = { };
>
> err = audit_netlink_ok(skb, msg_type);
> if (err)
> @@ -1418,25 +1417,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> case AUDIT_SIGNAL_INFO:
> len = 0;
> if (lsmblob_is_set(&audit_sig_lsm)) {
> - err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
> - &len);
> + err = security_secid_to_secctx(&audit_sig_lsm,
> + &context);
> if (err)
> return err;
> }
> sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
You forgot to update this kmalloc() to use context.len, so you'll end up
allocating too small a buffer and then writing out of bounds upon the
memcpy below.
> if (!sig_data) {
> - if (lsmblob_is_set(&audit_sig_lsm)) {
> - lsmcontext_init(&scaff, ctx, len, 0);
> - security_release_secctx(&scaff);
> - }
> + if (lsmblob_is_set(&audit_sig_lsm))
> + security_release_secctx(&context);
> return -ENOMEM;
> }
> sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
> sig_data->pid = audit_sig_pid;
> if (lsmblob_is_set(&audit_sig_lsm)) {
> - memcpy(sig_data->ctx, ctx, len);
> - lsmcontext_init(&scaff, ctx, len, 0);
> - security_release_secctx(&scaff);
> + memcpy(sig_data->ctx, context.context, context.len);
> + security_release_secctx(&context);
> }
> audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
> sig_data, sizeof(*sig_data) + len);
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx
2019-12-16 22:36 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
@ 2019-12-18 16:06 ` Stephen Smalley
2019-12-18 19:33 ` Stephen Smalley
1 sibling, 0 replies; 17+ messages in thread
From: Stephen Smalley @ 2019-12-18 16:06 UTC (permalink / raw)
To: Casey Schaufler, casey.schaufler, jmorris, linux-security-module,
selinux
Cc: keescook, john.johansen, penguin-kernel, paul
On 12/16/19 5:36 PM, Casey Schaufler wrote:
> Replace the (secctx,seclen) pointer pair with a single
> lsmcontext pointer to allow return of the LSM identifier
> along with the context and context length. This allows
> security_release_secctx() to know how to release the
> context. Callers have been modified to use or save the
> returned data from the new structure.
>
> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
> cc: netdev@vger.kernel.org
Usual disclaimer about needing to make sure netdev and perhaps others
(audit, binder?) have acked these changes.
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
> ---
> drivers/android/binder.c | 26 +++++++---------
> include/linux/security.h | 4 +--
> include/net/scm.h | 10 ++-----
> kernel/audit.c | 29 +++++++-----------
> kernel/auditsc.c | 31 +++++++------------
> net/ipv4/ip_sockglue.c | 7 ++---
> net/netfilter/nf_conntrack_netlink.c | 14 +++++----
> net/netfilter/nf_conntrack_standalone.c | 7 ++---
> net/netfilter/nfnetlink_queue.c | 5 +++-
> net/netlabel/netlabel_unlabeled.c | 40 ++++++++-----------------
> net/netlabel/netlabel_user.c | 7 ++---
> security/security.c | 10 +++++--
> 12 files changed, 74 insertions(+), 116 deletions(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index 1bca4d589e87..3c5eee35aae6 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -2859,9 +2859,7 @@ static void binder_transaction(struct binder_proc *proc,
> binder_size_t last_fixup_min_off = 0;
> struct binder_context *context = proc->context;
> int t_debug_id = atomic_inc_return(&binder_last_id);
> - char *secctx = NULL;
> - u32 secctx_sz = 0;
> - struct lsmcontext scaff; /* scaffolding */
> + struct lsmcontext lsmctx = { };
>
> e = binder_transaction_log_add(&binder_transaction_log);
> e->debug_id = t_debug_id;
> @@ -3109,14 +3107,14 @@ static void binder_transaction(struct binder_proc *proc,
> size_t added_size;
>
> security_task_getsecid(proc->tsk, &blob);
> - ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
> + ret = security_secid_to_secctx(&blob, &lsmctx);
> if (ret) {
> return_error = BR_FAILED_REPLY;
> return_error_param = ret;
> return_error_line = __LINE__;
> goto err_get_secctx_failed;
> }
> - added_size = ALIGN(secctx_sz, sizeof(u64));
> + added_size = ALIGN(lsmctx.len, sizeof(u64));
> extra_buffers_size += added_size;
> if (extra_buffers_size < added_size) {
> /* integer overflow of extra_buffers_size */
> @@ -3143,24 +3141,22 @@ static void binder_transaction(struct binder_proc *proc,
> t->buffer = NULL;
> goto err_binder_alloc_buf_failed;
> }
> - if (secctx) {
> + if (lsmctx.context) {
> int err;
> size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
> ALIGN(tr->offsets_size, sizeof(void *)) +
> ALIGN(extra_buffers_size, sizeof(void *)) -
> - ALIGN(secctx_sz, sizeof(u64));
> + ALIGN(lsmctx.len, sizeof(u64));
>
> t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
> err = binder_alloc_copy_to_buffer(&target_proc->alloc,
> t->buffer, buf_offset,
> - secctx, secctx_sz);
> + lsmctx.context, lsmctx.len);
> if (err) {
> t->security_ctx = 0;
> WARN_ON(1);
> }
> - lsmcontext_init(&scaff, secctx, secctx_sz, 0);
> - security_release_secctx(&scaff);
> - secctx = NULL;
> + security_release_secctx(&lsmctx);
> }
> t->buffer->debug_id = t->debug_id;
> t->buffer->transaction = t;
> @@ -3216,7 +3212,7 @@ static void binder_transaction(struct binder_proc *proc,
> off_end_offset = off_start_offset + tr->offsets_size;
> sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
> sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
> - ALIGN(secctx_sz, sizeof(u64));
> + ALIGN(lsmctx.len, sizeof(u64));
> off_min = 0;
> for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
> buffer_offset += sizeof(binder_size_t)) {
> @@ -3492,10 +3488,8 @@ static void binder_transaction(struct binder_proc *proc,
> binder_alloc_free_buf(&target_proc->alloc, t->buffer);
> err_binder_alloc_buf_failed:
> err_bad_extra_size:
> - if (secctx) {
> - lsmcontext_init(&scaff, secctx, secctx_sz, 0);
> - security_release_secctx(&scaff);
> - }
> + if (lsmctx.context)
> + security_release_secctx(&lsmctx);
> err_get_secctx_failed:
> kfree(tcomplete);
> binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 597d9802b89b..00421941f683 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -530,7 +530,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
> size_t size);
> int security_netlink_send(struct sock *sk, struct sk_buff *skb);
> int security_ismaclabel(const char *name);
> -int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
> +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
> int security_secctx_to_secid(const char *secdata, u32 seclen,
> struct lsmblob *blob);
> void security_release_secctx(struct lsmcontext *cp);
> @@ -1335,7 +1335,7 @@ static inline int security_ismaclabel(const char *name)
> }
>
> static inline int security_secid_to_secctx(struct lsmblob *blob,
> - char **secdata, u32 *seclen)
> + struct lsmcontext *cp)
> {
> return -EOPNOTSUPP;
> }
> diff --git a/include/net/scm.h b/include/net/scm.h
> index 30ba801c91bd..4a6ad8caf423 100644
> --- a/include/net/scm.h
> +++ b/include/net/scm.h
> @@ -93,18 +93,14 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
> static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
> {
> struct lsmcontext context;
> - char *secdata;
> - u32 seclen;
> int err;
>
> if (test_bit(SOCK_PASSSEC, &sock->flags)) {
> - err = security_secid_to_secctx(&scm->lsmblob, &secdata,
> - &seclen);
> + err = security_secid_to_secctx(&scm->lsmblob, &context);
>
> if (!err) {
> - put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
> - /*scaffolding*/
> - lsmcontext_init(&context, secdata, seclen, 0);
> + put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
> + context.len, context.context);
> security_release_secctx(&context);
> }
> }
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 3305c4af43a8..224c7b4a1bc0 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -1178,9 +1178,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> struct audit_buffer *ab;
> u16 msg_type = nlh->nlmsg_type;
> struct audit_sig_info *sig_data;
> - char *ctx = NULL;
> u32 len;
> - struct lsmcontext scaff; /* scaffolding */
> + struct lsmcontext context = { };
>
> err = audit_netlink_ok(skb, msg_type);
> if (err)
> @@ -1418,25 +1417,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> case AUDIT_SIGNAL_INFO:
> len = 0;
> if (lsmblob_is_set(&audit_sig_lsm)) {
> - err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
> - &len);
> + err = security_secid_to_secctx(&audit_sig_lsm,
> + &context);
> if (err)
> return err;
> }
> sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
> if (!sig_data) {
> - if (lsmblob_is_set(&audit_sig_lsm)) {
> - lsmcontext_init(&scaff, ctx, len, 0);
> - security_release_secctx(&scaff);
> - }
> + if (lsmblob_is_set(&audit_sig_lsm))
> + security_release_secctx(&context);
> return -ENOMEM;
> }
> sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
> sig_data->pid = audit_sig_pid;
> if (lsmblob_is_set(&audit_sig_lsm)) {
> - memcpy(sig_data->ctx, ctx, len);
> - lsmcontext_init(&scaff, ctx, len, 0);
> - security_release_secctx(&scaff);
> + memcpy(sig_data->ctx, context.context, context.len);
> + security_release_secctx(&context);
> }
> audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
> sig_data, sizeof(*sig_data) + len);
> @@ -2061,26 +2057,23 @@ void audit_log_key(struct audit_buffer *ab, char *key)
>
> int audit_log_task_context(struct audit_buffer *ab)
> {
> - char *ctx = NULL;
> - unsigned len;
> int error;
> struct lsmblob blob;
> - struct lsmcontext scaff; /* scaffolding */
> + struct lsmcontext context;
>
> security_task_getsecid(current, &blob);
> if (!lsmblob_is_set(&blob))
> return 0;
>
> - error = security_secid_to_secctx(&blob, &ctx, &len);
> + error = security_secid_to_secctx(&blob, &context);
> if (error) {
> if (error != -EINVAL)
> goto error_path;
> return 0;
> }
>
> - audit_log_format(ab, " subj=%s", ctx);
> - lsmcontext_init(&scaff, ctx, len, 0);
> - security_release_secctx(&scaff);
> + audit_log_format(ab, " subj=%s", context.context);
> + security_release_secctx(&context);
> return 0;
>
> error_path:
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 8790e7aafa7d..6d273183dd87 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -962,9 +962,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
> struct lsmblob *blob, char *comm)
> {
> struct audit_buffer *ab;
> - struct lsmcontext lsmcxt;
> - char *ctx = NULL;
> - u32 len;
> + struct lsmcontext lsmctx;
> int rc = 0;
>
> ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
> @@ -975,13 +973,12 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
> from_kuid(&init_user_ns, auid),
> from_kuid(&init_user_ns, uid), sessionid);
> if (lsmblob_is_set(blob)) {
> - if (security_secid_to_secctx(blob, &ctx, &len)) {
> + if (security_secid_to_secctx(blob, &lsmctx)) {
> audit_log_format(ab, " obj=(none)");
> rc = 1;
> } else {
> - audit_log_format(ab, " obj=%s", ctx);
> - lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/
> - security_release_secctx(&lsmcxt);
> + audit_log_format(ab, " obj=%s", lsmctx.context);
> + security_release_secctx(&lsmctx);
> }
> }
> audit_log_format(ab, " ocomm=");
> @@ -1194,7 +1191,6 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
>
> static void show_special(struct audit_context *context, int *call_panic)
> {
> - struct lsmcontext lsmcxt;
> struct audit_buffer *ab;
> int i;
>
> @@ -1218,17 +1214,15 @@ static void show_special(struct audit_context *context, int *call_panic)
> from_kgid(&init_user_ns, context->ipc.gid),
> context->ipc.mode);
> if (osid) {
> - char *ctx = NULL;
> - u32 len;
> + struct lsmcontext lsmcxt;
> struct lsmblob blob;
>
> lsmblob_init(&blob, osid);
> - if (security_secid_to_secctx(&blob, &ctx, &len)) {
> + if (security_secid_to_secctx(&blob, &lsmcxt)) {
> audit_log_format(ab, " osid=%u", osid);
> *call_panic = 1;
> } else {
> - audit_log_format(ab, " obj=%s", ctx);
> - lsmcontext_init(&lsmcxt, ctx, len, 0);
> + audit_log_format(ab, " obj=%s", lsmcxt.context);
> security_release_secctx(&lsmcxt);
> }
> }
> @@ -1372,20 +1366,17 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
> MAJOR(n->rdev),
> MINOR(n->rdev));
> if (n->osid != 0) {
> - char *ctx = NULL;
> - u32 len;
> struct lsmblob blob;
> - struct lsmcontext lsmcxt;
> + struct lsmcontext lsmctx;
>
> lsmblob_init(&blob, n->osid);
> - if (security_secid_to_secctx(&blob, &ctx, &len)) {
> + if (security_secid_to_secctx(&blob, &lsmctx)) {
> audit_log_format(ab, " osid=%u", n->osid);
> if (call_panic)
> *call_panic = 2;
> } else {
> - audit_log_format(ab, " obj=%s", ctx);
> - lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */
> - security_release_secctx(&lsmcxt);
> + audit_log_format(ab, " obj=%s", lsmctx.context);
> + security_release_secctx(&lsmctx);
> }
> }
>
> diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
> index 96d56a30ecca..27af7a6b8780 100644
> --- a/net/ipv4/ip_sockglue.c
> +++ b/net/ipv4/ip_sockglue.c
> @@ -132,20 +132,17 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
> {
> struct lsmcontext context;
> struct lsmblob lb;
> - char *secdata;
> - u32 seclen;
> int err;
>
> err = security_socket_getpeersec_dgram(NULL, skb, &lb);
> if (err)
> return;
>
> - err = security_secid_to_secctx(&lb, &secdata, &seclen);
> + err = security_secid_to_secctx(&lb, &context);
> if (err)
> return;
>
> - put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
> - lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */
> + put_cmsg(msg, SOL_IP, SCM_SECURITY, context.len, context.context);
> security_release_secctx(&context);
> }
>
> diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
> index 2f233f40c926..255bcb886a2f 100644
> --- a/net/netfilter/nf_conntrack_netlink.c
> +++ b/net/netfilter/nf_conntrack_netlink.c
> @@ -329,13 +329,12 @@ static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
> static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
> {
> struct nlattr *nest_secctx;
> - int len, ret;
> - char *secctx;
> + int ret;
> struct lsmblob blob;
> struct lsmcontext context;
>
> lsmblob_init(&blob, ct->secmark);
> - ret = security_secid_to_secctx(&blob, &secctx, &len);
> + ret = security_secid_to_secctx(&blob, &context);
> if (ret)
> return 0;
>
> @@ -344,13 +343,12 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
> if (!nest_secctx)
> goto nla_put_failure;
>
> - if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
> + if (nla_put_string(skb, CTA_SECCTX_NAME, context.context))
> goto nla_put_failure;
> nla_nest_end(skb, nest_secctx);
>
> ret = 0;
> nla_put_failure:
> - lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
> security_release_secctx(&context);
> return ret;
> }
> @@ -648,12 +646,16 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
> #ifdef CONFIG_NF_CONNTRACK_SECMARK
> int len, ret;
> struct lsmblob blob;
> + struct lsmcontext context;
>
> lsmblob_init(&blob, ct->secmark);
> - ret = security_secid_to_secctx(&blob, NULL, &len);
> + ret = security_secid_to_secctx(&blob, &context);
> if (ret)
> return 0;
>
> + len = context.len;
> + security_release_secctx(&context);
> +
> return nla_total_size(0) /* CTA_SECCTX */
> + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
> #else
> diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
> index 8601fcb99f7a..8969754d7fe9 100644
> --- a/net/netfilter/nf_conntrack_standalone.c
> +++ b/net/netfilter/nf_conntrack_standalone.c
> @@ -173,19 +173,16 @@ static void ct_seq_stop(struct seq_file *s, void *v)
> static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
> {
> int ret;
> - u32 len;
> - char *secctx;
> struct lsmblob blob;
> struct lsmcontext context;
>
> lsmblob_init(&blob, ct->secmark);
> - ret = security_secid_to_secctx(&blob, &secctx, &len);
> + ret = security_secid_to_secctx(&blob, &context);
> if (ret)
> return;
>
> - seq_printf(s, "secctx=%s ", secctx);
> + seq_printf(s, "secctx=%s ", context.context);
>
> - lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
> security_release_secctx(&context);
> }
> #else
> diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
> index cc3ef03ee198..2d6668fd026c 100644
> --- a/net/netfilter/nfnetlink_queue.c
> +++ b/net/netfilter/nfnetlink_queue.c
> @@ -306,6 +306,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
> u32 seclen = 0;
> #if IS_ENABLED(CONFIG_NETWORK_SECMARK)
> struct lsmblob blob;
> + struct lsmcontext context = { };
>
> if (!skb || !sk_fullsock(skb->sk))
> return 0;
> @@ -314,10 +315,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
>
> if (skb->secmark) {
> lsmblob_init(&blob, skb->secmark);
> - security_secid_to_secctx(&blob, secdata, &seclen);
> + security_secid_to_secctx(&blob, &context);
> + *secdata = context.context;
> }
>
> read_unlock_bh(&skb->sk->sk_callback_lock);
> + seclen = context.len;
> #endif
> return seclen;
> }
> diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
> index 288c005b44c7..c03fe9a4f7b9 100644
> --- a/net/netlabel/netlabel_unlabeled.c
> +++ b/net/netlabel/netlabel_unlabeled.c
> @@ -374,8 +374,6 @@ int netlbl_unlhsh_add(struct net *net,
> struct netlbl_unlhsh_iface *iface;
> struct audit_buffer *audit_buf = NULL;
> struct lsmcontext context;
> - char *secctx = NULL;
> - u32 secctx_len;
> struct lsmblob blob;
>
> if (addr_len != sizeof(struct in_addr) &&
> @@ -440,12 +438,9 @@ int netlbl_unlhsh_add(struct net *net,
> rcu_read_unlock();
> if (audit_buf != NULL) {
> lsmblob_init(&blob, secid);
> - if (security_secid_to_secctx(&blob,
> - &secctx,
> - &secctx_len) == 0) {
> - audit_log_format(audit_buf, " sec_obj=%s", secctx);
> - /* scaffolding */
> - lsmcontext_init(&context, secctx, secctx_len, 0);
> + if (security_secid_to_secctx(&blob, &context) == 0) {
> + audit_log_format(audit_buf, " sec_obj=%s",
> + context.context);
> security_release_secctx(&context);
> }
> audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
> @@ -478,8 +473,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
> struct audit_buffer *audit_buf;
> struct net_device *dev;
> struct lsmcontext context;
> - char *secctx;
> - u32 secctx_len;
> struct lsmblob blob;
>
> spin_lock(&netlbl_unlhsh_lock);
> @@ -503,11 +496,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
> if (entry != NULL)
> lsmblob_init(&blob, entry->secid);
> if (entry != NULL &&
> - security_secid_to_secctx(&blob,
> - &secctx, &secctx_len) == 0) {
> - audit_log_format(audit_buf, " sec_obj=%s", secctx);
> - /* scaffolding */
> - lsmcontext_init(&context, secctx, secctx_len, 0);
> + security_secid_to_secctx(&blob, &context) == 0) {
> + audit_log_format(audit_buf, " sec_obj=%s",
> + context.context);
> security_release_secctx(&context);
> }
> audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
> @@ -546,8 +537,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
> struct audit_buffer *audit_buf;
> struct net_device *dev;
> struct lsmcontext context;
> - char *secctx;
> - u32 secctx_len;
> struct lsmblob blob;
>
> spin_lock(&netlbl_unlhsh_lock);
> @@ -570,10 +559,9 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
> if (entry != NULL)
> lsmblob_init(&blob, entry->secid);
> if (entry != NULL &&
> - security_secid_to_secctx(&blob,
> - &secctx, &secctx_len) == 0) {
> - audit_log_format(audit_buf, " sec_obj=%s", secctx);
> - lsmcontext_init(&context, secctx, secctx_len, 0);
> + security_secid_to_secctx(&blob, &context) == 0) {
> + audit_log_format(audit_buf, " sec_obj=%s",
> + context.context);
> security_release_secctx(&context);
> }
> audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
> @@ -1091,8 +1079,6 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
> struct lsmcontext context;
> void *data;
> u32 secid;
> - char *secctx;
> - u32 secctx_len;
> struct lsmblob blob;
>
> data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
> @@ -1149,15 +1135,13 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
> }
>
> lsmblob_init(&blob, secid);
> - ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len);
> + ret_val = security_secid_to_secctx(&blob, &context);
> if (ret_val != 0)
> goto list_cb_failure;
> ret_val = nla_put(cb_arg->skb,
> NLBL_UNLABEL_A_SECCTX,
> - secctx_len,
> - secctx);
> - /* scaffolding */
> - lsmcontext_init(&context, secctx, secctx_len, 0);
> + context.len,
> + context.context);
> security_release_secctx(&context);
> if (ret_val != 0)
> goto list_cb_failure;
> diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
> index ef139d8ae7cd..951ba0639d20 100644
> --- a/net/netlabel/netlabel_user.c
> +++ b/net/netlabel/netlabel_user.c
> @@ -85,8 +85,6 @@ struct audit_buffer *netlbl_audit_start_common(int type,
> {
> struct audit_buffer *audit_buf;
> struct lsmcontext context;
> - char *secctx;
> - u32 secctx_len;
> struct lsmblob blob;
>
> if (audit_enabled == AUDIT_OFF)
> @@ -102,9 +100,8 @@ struct audit_buffer *netlbl_audit_start_common(int type,
>
> lsmblob_init(&blob, audit_info->secid);
> if (audit_info->secid != 0 &&
> - security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
> - audit_log_format(audit_buf, " subj=%s", secctx);
> - lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/
> + security_secid_to_secctx(&blob, &context) == 0) {
> + audit_log_format(audit_buf, " subj=%s", context.context);
> security_release_secctx(&context);
> }
>
> diff --git a/security/security.c b/security/security.c
> index 6310ca7e84ed..4ba1a6ed36e0 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -2109,18 +2109,22 @@ int security_ismaclabel(const char *name)
> }
> EXPORT_SYMBOL(security_ismaclabel);
>
> -int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
> +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
> {
> struct security_hook_list *hp;
> int display = lsm_task_display(current);
>
> + memset(cp, 0, sizeof(*cp));
> +
> hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
> if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
> continue;
> - if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
> + if (display == LSMBLOB_INVALID || display == hp->lsmid->slot) {
> + cp->slot = hp->lsmid->slot;
> return hp->hook.secid_to_secctx(
> blob->secid[hp->lsmid->slot],
> - secdata, seclen);
> + &cp->context, &cp->len);
> + }
> }
> return 0;
> }
>
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx
2019-12-16 22:35 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
@ 2019-12-16 22:36 ` Casey Schaufler
2019-12-18 16:06 ` Stephen Smalley
2019-12-18 19:33 ` Stephen Smalley
0 siblings, 2 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-16 22:36 UTC (permalink / raw)
To: casey.schaufler, jmorris, linux-security-module, selinux
Cc: keescook, john.johansen, penguin-kernel, paul, sds
Replace the (secctx,seclen) pointer pair with a single
lsmcontext pointer to allow return of the LSM identifier
along with the context and context length. This allows
security_release_secctx() to know how to release the
context. Callers have been modified to use or save the
returned data from the new structure.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
drivers/android/binder.c | 26 +++++++---------
include/linux/security.h | 4 +--
include/net/scm.h | 10 ++-----
kernel/audit.c | 29 +++++++-----------
kernel/auditsc.c | 31 +++++++------------
net/ipv4/ip_sockglue.c | 7 ++---
net/netfilter/nf_conntrack_netlink.c | 14 +++++----
net/netfilter/nf_conntrack_standalone.c | 7 ++---
net/netfilter/nfnetlink_queue.c | 5 +++-
net/netlabel/netlabel_unlabeled.c | 40 ++++++++-----------------
net/netlabel/netlabel_user.c | 7 ++---
security/security.c | 10 +++++--
12 files changed, 74 insertions(+), 116 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1bca4d589e87..3c5eee35aae6 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2859,9 +2859,7 @@ static void binder_transaction(struct binder_proc *proc,
binder_size_t last_fixup_min_off = 0;
struct binder_context *context = proc->context;
int t_debug_id = atomic_inc_return(&binder_last_id);
- char *secctx = NULL;
- u32 secctx_sz = 0;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext lsmctx = { };
e = binder_transaction_log_add(&binder_transaction_log);
e->debug_id = t_debug_id;
@@ -3109,14 +3107,14 @@ static void binder_transaction(struct binder_proc *proc,
size_t added_size;
security_task_getsecid(proc->tsk, &blob);
- ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
+ ret = security_secid_to_secctx(&blob, &lsmctx);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
return_error_line = __LINE__;
goto err_get_secctx_failed;
}
- added_size = ALIGN(secctx_sz, sizeof(u64));
+ added_size = ALIGN(lsmctx.len, sizeof(u64));
extra_buffers_size += added_size;
if (extra_buffers_size < added_size) {
/* integer overflow of extra_buffers_size */
@@ -3143,24 +3141,22 @@ static void binder_transaction(struct binder_proc *proc,
t->buffer = NULL;
goto err_binder_alloc_buf_failed;
}
- if (secctx) {
+ if (lsmctx.context) {
int err;
size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
ALIGN(tr->offsets_size, sizeof(void *)) +
ALIGN(extra_buffers_size, sizeof(void *)) -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
err = binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset,
- secctx, secctx_sz);
+ lsmctx.context, lsmctx.len);
if (err) {
t->security_ctx = 0;
WARN_ON(1);
}
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- secctx = NULL;
+ security_release_secctx(&lsmctx);
}
t->buffer->debug_id = t->debug_id;
t->buffer->transaction = t;
@@ -3216,7 +3212,7 @@ static void binder_transaction(struct binder_proc *proc,
off_end_offset = off_start_offset + tr->offsets_size;
sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
off_min = 0;
for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {
@@ -3492,10 +3488,8 @@ static void binder_transaction(struct binder_proc *proc,
binder_alloc_free_buf(&target_proc->alloc, t->buffer);
err_binder_alloc_buf_failed:
err_bad_extra_size:
- if (secctx) {
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmctx.context)
+ security_release_secctx(&lsmctx);
err_get_secctx_failed:
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
diff --git a/include/linux/security.h b/include/linux/security.h
index 597d9802b89b..00421941f683 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -530,7 +530,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
void security_release_secctx(struct lsmcontext *cp);
@@ -1335,7 +1335,7 @@ static inline int security_ismaclabel(const char *name)
}
static inline int security_secid_to_secctx(struct lsmblob *blob,
- char **secdata, u32 *seclen)
+ struct lsmcontext *cp)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index 30ba801c91bd..4a6ad8caf423 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -93,18 +93,14 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{
struct lsmcontext context;
- char *secdata;
- u32 seclen;
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(&scm->lsmblob, &secdata,
- &seclen);
+ err = security_secid_to_secctx(&scm->lsmblob, &context);
if (!err) {
- put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
- /*scaffolding*/
- lsmcontext_init(&context, secdata, seclen, 0);
+ put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
+ context.len, context.context);
security_release_secctx(&context);
}
}
diff --git a/kernel/audit.c b/kernel/audit.c
index 3305c4af43a8..224c7b4a1bc0 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1178,9 +1178,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
struct audit_sig_info *sig_data;
- char *ctx = NULL;
u32 len;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context = { };
err = audit_netlink_ok(skb, msg_type);
if (err)
@@ -1418,25 +1417,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_SIGNAL_INFO:
len = 0;
if (lsmblob_is_set(&audit_sig_lsm)) {
- err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
- &len);
+ err = security_secid_to_secctx(&audit_sig_lsm,
+ &context);
if (err)
return err;
}
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
if (!sig_data) {
- if (lsmblob_is_set(&audit_sig_lsm)) {
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmblob_is_set(&audit_sig_lsm))
+ security_release_secctx(&context);
return -ENOMEM;
}
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
if (lsmblob_is_set(&audit_sig_lsm)) {
- memcpy(sig_data->ctx, ctx, len);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ memcpy(sig_data->ctx, context.context, context.len);
+ security_release_secctx(&context);
}
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
sig_data, sizeof(*sig_data) + len);
@@ -2061,26 +2057,23 @@ void audit_log_key(struct audit_buffer *ab, char *key)
int audit_log_task_context(struct audit_buffer *ab)
{
- char *ctx = NULL;
- unsigned len;
int error;
struct lsmblob blob;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context;
security_task_getsecid(current, &blob);
if (!lsmblob_is_set(&blob))
return 0;
- error = security_secid_to_secctx(&blob, &ctx, &len);
+ error = security_secid_to_secctx(&blob, &context);
if (error) {
if (error != -EINVAL)
goto error_path;
return 0;
}
- audit_log_format(ab, " subj=%s", ctx);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ audit_log_format(ab, " subj=%s", context.context);
+ security_release_secctx(&context);
return 0;
error_path:
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8790e7aafa7d..6d273183dd87 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -962,9 +962,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
- struct lsmcontext lsmcxt;
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmctx;
int rc = 0;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
@@ -975,13 +973,12 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (lsmblob_is_set(blob)) {
- if (security_secid_to_secctx(blob, &ctx, &len)) {
+ if (security_secid_to_secctx(blob, &lsmctx)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
audit_log_format(ab, " ocomm=");
@@ -1194,7 +1191,6 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
static void show_special(struct audit_context *context, int *call_panic)
{
- struct lsmcontext lsmcxt;
struct audit_buffer *ab;
int i;
@@ -1218,17 +1214,15 @@ static void show_special(struct audit_context *context, int *call_panic)
from_kgid(&init_user_ns, context->ipc.gid),
context->ipc.mode);
if (osid) {
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmcxt;
struct lsmblob blob;
lsmblob_init(&blob, osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmcxt)) {
audit_log_format(ab, " osid=%u", osid);
*call_panic = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0);
+ audit_log_format(ab, " obj=%s", lsmcxt.context);
security_release_secctx(&lsmcxt);
}
}
@@ -1372,20 +1366,17 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
MAJOR(n->rdev),
MINOR(n->rdev));
if (n->osid != 0) {
- char *ctx = NULL;
- u32 len;
struct lsmblob blob;
- struct lsmcontext lsmcxt;
+ struct lsmcontext lsmctx;
lsmblob_init(&blob, n->osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmctx)) {
audit_log_format(ab, " osid=%u", n->osid);
if (call_panic)
*call_panic = 2;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 96d56a30ecca..27af7a6b8780 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -132,20 +132,17 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
struct lsmcontext context;
struct lsmblob lb;
- char *secdata;
- u32 seclen;
int err;
err = security_socket_getpeersec_dgram(NULL, skb, &lb);
if (err)
return;
- err = security_secid_to_secctx(&lb, &secdata, &seclen);
+ err = security_secid_to_secctx(&lb, &context);
if (err)
return;
- put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
- lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */
+ put_cmsg(msg, SOL_IP, SCM_SECURITY, context.len, context.context);
security_release_secctx(&context);
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 2f233f40c926..255bcb886a2f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -329,13 +329,12 @@ static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_secctx;
- int len, ret;
- char *secctx;
+ int ret;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
@@ -344,13 +343,12 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
if (!nest_secctx)
goto nla_put_failure;
- if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
+ if (nla_put_string(skb, CTA_SECCTX_NAME, context.context))
goto nla_put_failure;
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
return ret;
}
@@ -648,12 +646,16 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;
struct lsmblob blob;
+ struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, NULL, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
+ len = context.len;
+ security_release_secctx(&context);
+
return nla_total_size(0) /* CTA_SECCTX */
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
#else
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 8601fcb99f7a..8969754d7fe9 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -173,19 +173,16 @@ static void ct_seq_stop(struct seq_file *s, void *v)
static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
int ret;
- u32 len;
- char *secctx;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return;
- seq_printf(s, "secctx=%s ", secctx);
+ seq_printf(s, "secctx=%s ", context.context);
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
}
#else
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index cc3ef03ee198..2d6668fd026c 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -306,6 +306,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
struct lsmblob blob;
+ struct lsmcontext context = { };
if (!skb || !sk_fullsock(skb->sk))
return 0;
@@ -314,10 +315,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
if (skb->secmark) {
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, secdata, &seclen);
+ security_secid_to_secctx(&blob, &context);
+ *secdata = context.context;
}
read_unlock_bh(&skb->sk->sk_callback_lock);
+ seclen = context.len;
#endif
return seclen;
}
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 288c005b44c7..c03fe9a4f7b9 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -374,8 +374,6 @@ int netlbl_unlhsh_add(struct net *net,
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
struct lsmcontext context;
- char *secctx = NULL;
- u32 secctx_len;
struct lsmblob blob;
if (addr_len != sizeof(struct in_addr) &&
@@ -440,12 +438,9 @@ int netlbl_unlhsh_add(struct net *net,
rcu_read_unlock();
if (audit_buf != NULL) {
lsmblob_init(&blob, secid);
- if (security_secid_to_secctx(&blob,
- &secctx,
- &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ if (security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
@@ -478,8 +473,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -503,11 +496,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -546,8 +537,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -570,10 +559,9 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -1091,8 +1079,6 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
struct lsmcontext context;
void *data;
u32 secid;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
@@ -1149,15 +1135,13 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
}
lsmblob_init(&blob, secid);
- ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len);
+ ret_val = security_secid_to_secctx(&blob, &context);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_SECCTX,
- secctx_len,
- secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ context.len,
+ context.context);
security_release_secctx(&context);
if (ret_val != 0)
goto list_cb_failure;
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index ef139d8ae7cd..951ba0639d20 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -85,8 +85,6 @@ struct audit_buffer *netlbl_audit_start_common(int type,
{
struct audit_buffer *audit_buf;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
if (audit_enabled == AUDIT_OFF)
@@ -102,9 +100,8 @@ struct audit_buffer *netlbl_audit_start_common(int type,
lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " subj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " subj=%s", context.context);
security_release_secctx(&context);
}
diff --git a/security/security.c b/security/security.c
index 6310ca7e84ed..4ba1a6ed36e0 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2109,18 +2109,22 @@ int security_ismaclabel(const char *name)
}
EXPORT_SYMBOL(security_ismaclabel);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
{
struct security_hook_list *hp;
int display = lsm_task_display(current);
+ memset(cp, 0, sizeof(*cp));
+
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+ if (display == LSMBLOB_INVALID || display == hp->lsmid->slot) {
+ cp->slot = hp->lsmid->slot;
return hp->hook.secid_to_secctx(
blob->secid[hp->lsmid->slot],
- secdata, seclen);
+ &cp->context, &cp->len);
+ }
}
return 0;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx
2019-12-16 22:33 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
@ 2019-12-16 22:33 ` Casey Schaufler
0 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-16 22:33 UTC (permalink / raw)
To: casey.schaufler, jmorris, linux-security-module, selinux
Cc: keescook, john.johansen, penguin-kernel, paul, sds
Replace the (secctx,seclen) pointer pair with a single
lsmcontext pointer to allow return of the LSM identifier
along with the context and context length. This allows
security_release_secctx() to know how to release the
context. Callers have been modified to use or save the
returned data from the new structure.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
drivers/android/binder.c | 26 +++++++---------
include/linux/security.h | 4 +--
include/net/scm.h | 10 ++-----
kernel/audit.c | 29 +++++++-----------
kernel/auditsc.c | 31 +++++++------------
net/ipv4/ip_sockglue.c | 7 ++---
net/netfilter/nf_conntrack_netlink.c | 14 +++++----
net/netfilter/nf_conntrack_standalone.c | 7 ++---
net/netfilter/nfnetlink_queue.c | 5 +++-
net/netlabel/netlabel_unlabeled.c | 40 ++++++++-----------------
net/netlabel/netlabel_user.c | 7 ++---
security/security.c | 10 +++++--
12 files changed, 74 insertions(+), 116 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1bca4d589e87..3c5eee35aae6 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2859,9 +2859,7 @@ static void binder_transaction(struct binder_proc *proc,
binder_size_t last_fixup_min_off = 0;
struct binder_context *context = proc->context;
int t_debug_id = atomic_inc_return(&binder_last_id);
- char *secctx = NULL;
- u32 secctx_sz = 0;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext lsmctx = { };
e = binder_transaction_log_add(&binder_transaction_log);
e->debug_id = t_debug_id;
@@ -3109,14 +3107,14 @@ static void binder_transaction(struct binder_proc *proc,
size_t added_size;
security_task_getsecid(proc->tsk, &blob);
- ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
+ ret = security_secid_to_secctx(&blob, &lsmctx);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
return_error_line = __LINE__;
goto err_get_secctx_failed;
}
- added_size = ALIGN(secctx_sz, sizeof(u64));
+ added_size = ALIGN(lsmctx.len, sizeof(u64));
extra_buffers_size += added_size;
if (extra_buffers_size < added_size) {
/* integer overflow of extra_buffers_size */
@@ -3143,24 +3141,22 @@ static void binder_transaction(struct binder_proc *proc,
t->buffer = NULL;
goto err_binder_alloc_buf_failed;
}
- if (secctx) {
+ if (lsmctx.context) {
int err;
size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
ALIGN(tr->offsets_size, sizeof(void *)) +
ALIGN(extra_buffers_size, sizeof(void *)) -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
err = binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset,
- secctx, secctx_sz);
+ lsmctx.context, lsmctx.len);
if (err) {
t->security_ctx = 0;
WARN_ON(1);
}
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- secctx = NULL;
+ security_release_secctx(&lsmctx);
}
t->buffer->debug_id = t->debug_id;
t->buffer->transaction = t;
@@ -3216,7 +3212,7 @@ static void binder_transaction(struct binder_proc *proc,
off_end_offset = off_start_offset + tr->offsets_size;
sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
off_min = 0;
for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {
@@ -3492,10 +3488,8 @@ static void binder_transaction(struct binder_proc *proc,
binder_alloc_free_buf(&target_proc->alloc, t->buffer);
err_binder_alloc_buf_failed:
err_bad_extra_size:
- if (secctx) {
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmctx.context)
+ security_release_secctx(&lsmctx);
err_get_secctx_failed:
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
diff --git a/include/linux/security.h b/include/linux/security.h
index 597d9802b89b..00421941f683 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -530,7 +530,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
void security_release_secctx(struct lsmcontext *cp);
@@ -1335,7 +1335,7 @@ static inline int security_ismaclabel(const char *name)
}
static inline int security_secid_to_secctx(struct lsmblob *blob,
- char **secdata, u32 *seclen)
+ struct lsmcontext *cp)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index 30ba801c91bd..4a6ad8caf423 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -93,18 +93,14 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{
struct lsmcontext context;
- char *secdata;
- u32 seclen;
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(&scm->lsmblob, &secdata,
- &seclen);
+ err = security_secid_to_secctx(&scm->lsmblob, &context);
if (!err) {
- put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
- /*scaffolding*/
- lsmcontext_init(&context, secdata, seclen, 0);
+ put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
+ context.len, context.context);
security_release_secctx(&context);
}
}
diff --git a/kernel/audit.c b/kernel/audit.c
index 3305c4af43a8..224c7b4a1bc0 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1178,9 +1178,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
struct audit_sig_info *sig_data;
- char *ctx = NULL;
u32 len;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context = { };
err = audit_netlink_ok(skb, msg_type);
if (err)
@@ -1418,25 +1417,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_SIGNAL_INFO:
len = 0;
if (lsmblob_is_set(&audit_sig_lsm)) {
- err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
- &len);
+ err = security_secid_to_secctx(&audit_sig_lsm,
+ &context);
if (err)
return err;
}
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
if (!sig_data) {
- if (lsmblob_is_set(&audit_sig_lsm)) {
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmblob_is_set(&audit_sig_lsm))
+ security_release_secctx(&context);
return -ENOMEM;
}
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
if (lsmblob_is_set(&audit_sig_lsm)) {
- memcpy(sig_data->ctx, ctx, len);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ memcpy(sig_data->ctx, context.context, context.len);
+ security_release_secctx(&context);
}
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
sig_data, sizeof(*sig_data) + len);
@@ -2061,26 +2057,23 @@ void audit_log_key(struct audit_buffer *ab, char *key)
int audit_log_task_context(struct audit_buffer *ab)
{
- char *ctx = NULL;
- unsigned len;
int error;
struct lsmblob blob;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context;
security_task_getsecid(current, &blob);
if (!lsmblob_is_set(&blob))
return 0;
- error = security_secid_to_secctx(&blob, &ctx, &len);
+ error = security_secid_to_secctx(&blob, &context);
if (error) {
if (error != -EINVAL)
goto error_path;
return 0;
}
- audit_log_format(ab, " subj=%s", ctx);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ audit_log_format(ab, " subj=%s", context.context);
+ security_release_secctx(&context);
return 0;
error_path:
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8790e7aafa7d..6d273183dd87 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -962,9 +962,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
- struct lsmcontext lsmcxt;
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmctx;
int rc = 0;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
@@ -975,13 +973,12 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (lsmblob_is_set(blob)) {
- if (security_secid_to_secctx(blob, &ctx, &len)) {
+ if (security_secid_to_secctx(blob, &lsmctx)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
audit_log_format(ab, " ocomm=");
@@ -1194,7 +1191,6 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
static void show_special(struct audit_context *context, int *call_panic)
{
- struct lsmcontext lsmcxt;
struct audit_buffer *ab;
int i;
@@ -1218,17 +1214,15 @@ static void show_special(struct audit_context *context, int *call_panic)
from_kgid(&init_user_ns, context->ipc.gid),
context->ipc.mode);
if (osid) {
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmcxt;
struct lsmblob blob;
lsmblob_init(&blob, osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmcxt)) {
audit_log_format(ab, " osid=%u", osid);
*call_panic = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0);
+ audit_log_format(ab, " obj=%s", lsmcxt.context);
security_release_secctx(&lsmcxt);
}
}
@@ -1372,20 +1366,17 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
MAJOR(n->rdev),
MINOR(n->rdev));
if (n->osid != 0) {
- char *ctx = NULL;
- u32 len;
struct lsmblob blob;
- struct lsmcontext lsmcxt;
+ struct lsmcontext lsmctx;
lsmblob_init(&blob, n->osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmctx)) {
audit_log_format(ab, " osid=%u", n->osid);
if (call_panic)
*call_panic = 2;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 96d56a30ecca..27af7a6b8780 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -132,20 +132,17 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
struct lsmcontext context;
struct lsmblob lb;
- char *secdata;
- u32 seclen;
int err;
err = security_socket_getpeersec_dgram(NULL, skb, &lb);
if (err)
return;
- err = security_secid_to_secctx(&lb, &secdata, &seclen);
+ err = security_secid_to_secctx(&lb, &context);
if (err)
return;
- put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
- lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */
+ put_cmsg(msg, SOL_IP, SCM_SECURITY, context.len, context.context);
security_release_secctx(&context);
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 2f233f40c926..255bcb886a2f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -329,13 +329,12 @@ static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_secctx;
- int len, ret;
- char *secctx;
+ int ret;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
@@ -344,13 +343,12 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
if (!nest_secctx)
goto nla_put_failure;
- if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
+ if (nla_put_string(skb, CTA_SECCTX_NAME, context.context))
goto nla_put_failure;
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
return ret;
}
@@ -648,12 +646,16 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;
struct lsmblob blob;
+ struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, NULL, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
+ len = context.len;
+ security_release_secctx(&context);
+
return nla_total_size(0) /* CTA_SECCTX */
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
#else
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 8601fcb99f7a..8969754d7fe9 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -173,19 +173,16 @@ static void ct_seq_stop(struct seq_file *s, void *v)
static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
int ret;
- u32 len;
- char *secctx;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return;
- seq_printf(s, "secctx=%s ", secctx);
+ seq_printf(s, "secctx=%s ", context.context);
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
}
#else
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index cc3ef03ee198..2d6668fd026c 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -306,6 +306,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
struct lsmblob blob;
+ struct lsmcontext context = { };
if (!skb || !sk_fullsock(skb->sk))
return 0;
@@ -314,10 +315,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
if (skb->secmark) {
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, secdata, &seclen);
+ security_secid_to_secctx(&blob, &context);
+ *secdata = context.context;
}
read_unlock_bh(&skb->sk->sk_callback_lock);
+ seclen = context.len;
#endif
return seclen;
}
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 288c005b44c7..c03fe9a4f7b9 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -374,8 +374,6 @@ int netlbl_unlhsh_add(struct net *net,
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
struct lsmcontext context;
- char *secctx = NULL;
- u32 secctx_len;
struct lsmblob blob;
if (addr_len != sizeof(struct in_addr) &&
@@ -440,12 +438,9 @@ int netlbl_unlhsh_add(struct net *net,
rcu_read_unlock();
if (audit_buf != NULL) {
lsmblob_init(&blob, secid);
- if (security_secid_to_secctx(&blob,
- &secctx,
- &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ if (security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
@@ -478,8 +473,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -503,11 +496,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -546,8 +537,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -570,10 +559,9 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -1091,8 +1079,6 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
struct lsmcontext context;
void *data;
u32 secid;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
@@ -1149,15 +1135,13 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
}
lsmblob_init(&blob, secid);
- ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len);
+ ret_val = security_secid_to_secctx(&blob, &context);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_SECCTX,
- secctx_len,
- secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ context.len,
+ context.context);
security_release_secctx(&context);
if (ret_val != 0)
goto list_cb_failure;
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index ef139d8ae7cd..951ba0639d20 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -85,8 +85,6 @@ struct audit_buffer *netlbl_audit_start_common(int type,
{
struct audit_buffer *audit_buf;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
if (audit_enabled == AUDIT_OFF)
@@ -102,9 +100,8 @@ struct audit_buffer *netlbl_audit_start_common(int type,
lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " subj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " subj=%s", context.context);
security_release_secctx(&context);
}
diff --git a/security/security.c b/security/security.c
index 6310ca7e84ed..4ba1a6ed36e0 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2109,18 +2109,22 @@ int security_ismaclabel(const char *name)
}
EXPORT_SYMBOL(security_ismaclabel);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
{
struct security_hook_list *hp;
int display = lsm_task_display(current);
+ memset(cp, 0, sizeof(*cp));
+
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+ if (display == LSMBLOB_INVALID || display == hp->lsmid->slot) {
+ cp->slot = hp->lsmid->slot;
return hp->hook.secid_to_secctx(
blob->secid[hp->lsmid->slot],
- secdata, seclen);
+ &cp->context, &cp->len);
+ }
}
return 0;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx
2019-12-16 22:24 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
@ 2019-12-16 22:24 ` Casey Schaufler
0 siblings, 0 replies; 17+ messages in thread
From: Casey Schaufler @ 2019-12-16 22:24 UTC (permalink / raw)
To: casey.schaufler, jmorris, linux-security-module, selinux
Cc: keescook, john.johansen, penguin-kernel, paul, sds
Replace the (secctx,seclen) pointer pair with a single
lsmcontext pointer to allow return of the LSM identifier
along with the context and context length. This allows
security_release_secctx() to know how to release the
context. Callers have been modified to use or save the
returned data from the new structure.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: netdev@vger.kernel.org
---
drivers/android/binder.c | 26 +++++++---------
include/linux/security.h | 4 +--
include/net/scm.h | 10 ++-----
kernel/audit.c | 29 +++++++-----------
kernel/auditsc.c | 31 +++++++------------
net/ipv4/ip_sockglue.c | 7 ++---
net/netfilter/nf_conntrack_netlink.c | 14 +++++----
net/netfilter/nf_conntrack_standalone.c | 7 ++---
net/netfilter/nfnetlink_queue.c | 5 +++-
net/netlabel/netlabel_unlabeled.c | 40 ++++++++-----------------
net/netlabel/netlabel_user.c | 7 ++---
security/security.c | 10 +++++--
12 files changed, 74 insertions(+), 116 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1bca4d589e87..3c5eee35aae6 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2859,9 +2859,7 @@ static void binder_transaction(struct binder_proc *proc,
binder_size_t last_fixup_min_off = 0;
struct binder_context *context = proc->context;
int t_debug_id = atomic_inc_return(&binder_last_id);
- char *secctx = NULL;
- u32 secctx_sz = 0;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext lsmctx = { };
e = binder_transaction_log_add(&binder_transaction_log);
e->debug_id = t_debug_id;
@@ -3109,14 +3107,14 @@ static void binder_transaction(struct binder_proc *proc,
size_t added_size;
security_task_getsecid(proc->tsk, &blob);
- ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz);
+ ret = security_secid_to_secctx(&blob, &lsmctx);
if (ret) {
return_error = BR_FAILED_REPLY;
return_error_param = ret;
return_error_line = __LINE__;
goto err_get_secctx_failed;
}
- added_size = ALIGN(secctx_sz, sizeof(u64));
+ added_size = ALIGN(lsmctx.len, sizeof(u64));
extra_buffers_size += added_size;
if (extra_buffers_size < added_size) {
/* integer overflow of extra_buffers_size */
@@ -3143,24 +3141,22 @@ static void binder_transaction(struct binder_proc *proc,
t->buffer = NULL;
goto err_binder_alloc_buf_failed;
}
- if (secctx) {
+ if (lsmctx.context) {
int err;
size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
ALIGN(tr->offsets_size, sizeof(void *)) +
ALIGN(extra_buffers_size, sizeof(void *)) -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
err = binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset,
- secctx, secctx_sz);
+ lsmctx.context, lsmctx.len);
if (err) {
t->security_ctx = 0;
WARN_ON(1);
}
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- secctx = NULL;
+ security_release_secctx(&lsmctx);
}
t->buffer->debug_id = t->debug_id;
t->buffer->transaction = t;
@@ -3216,7 +3212,7 @@ static void binder_transaction(struct binder_proc *proc,
off_end_offset = off_start_offset + tr->offsets_size;
sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
- ALIGN(secctx_sz, sizeof(u64));
+ ALIGN(lsmctx.len, sizeof(u64));
off_min = 0;
for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {
@@ -3492,10 +3488,8 @@ static void binder_transaction(struct binder_proc *proc,
binder_alloc_free_buf(&target_proc->alloc, t->buffer);
err_binder_alloc_buf_failed:
err_bad_extra_size:
- if (secctx) {
- lsmcontext_init(&scaff, secctx, secctx_sz, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmctx.context)
+ security_release_secctx(&lsmctx);
err_get_secctx_failed:
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
diff --git a/include/linux/security.h b/include/linux/security.h
index 597d9802b89b..00421941f683 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -530,7 +530,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen);
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob);
void security_release_secctx(struct lsmcontext *cp);
@@ -1335,7 +1335,7 @@ static inline int security_ismaclabel(const char *name)
}
static inline int security_secid_to_secctx(struct lsmblob *blob,
- char **secdata, u32 *seclen)
+ struct lsmcontext *cp)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index 30ba801c91bd..4a6ad8caf423 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -93,18 +93,14 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{
struct lsmcontext context;
- char *secdata;
- u32 seclen;
int err;
if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(&scm->lsmblob, &secdata,
- &seclen);
+ err = security_secid_to_secctx(&scm->lsmblob, &context);
if (!err) {
- put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
- /*scaffolding*/
- lsmcontext_init(&context, secdata, seclen, 0);
+ put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
+ context.len, context.context);
security_release_secctx(&context);
}
}
diff --git a/kernel/audit.c b/kernel/audit.c
index 3305c4af43a8..224c7b4a1bc0 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1178,9 +1178,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
struct audit_sig_info *sig_data;
- char *ctx = NULL;
u32 len;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context = { };
err = audit_netlink_ok(skb, msg_type);
if (err)
@@ -1418,25 +1417,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_SIGNAL_INFO:
len = 0;
if (lsmblob_is_set(&audit_sig_lsm)) {
- err = security_secid_to_secctx(&audit_sig_lsm, &ctx,
- &len);
+ err = security_secid_to_secctx(&audit_sig_lsm,
+ &context);
if (err)
return err;
}
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
if (!sig_data) {
- if (lsmblob_is_set(&audit_sig_lsm)) {
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
- }
+ if (lsmblob_is_set(&audit_sig_lsm))
+ security_release_secctx(&context);
return -ENOMEM;
}
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
sig_data->pid = audit_sig_pid;
if (lsmblob_is_set(&audit_sig_lsm)) {
- memcpy(sig_data->ctx, ctx, len);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ memcpy(sig_data->ctx, context.context, context.len);
+ security_release_secctx(&context);
}
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
sig_data, sizeof(*sig_data) + len);
@@ -2061,26 +2057,23 @@ void audit_log_key(struct audit_buffer *ab, char *key)
int audit_log_task_context(struct audit_buffer *ab)
{
- char *ctx = NULL;
- unsigned len;
int error;
struct lsmblob blob;
- struct lsmcontext scaff; /* scaffolding */
+ struct lsmcontext context;
security_task_getsecid(current, &blob);
if (!lsmblob_is_set(&blob))
return 0;
- error = security_secid_to_secctx(&blob, &ctx, &len);
+ error = security_secid_to_secctx(&blob, &context);
if (error) {
if (error != -EINVAL)
goto error_path;
return 0;
}
- audit_log_format(ab, " subj=%s", ctx);
- lsmcontext_init(&scaff, ctx, len, 0);
- security_release_secctx(&scaff);
+ audit_log_format(ab, " subj=%s", context.context);
+ security_release_secctx(&context);
return 0;
error_path:
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8790e7aafa7d..6d273183dd87 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -962,9 +962,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
- struct lsmcontext lsmcxt;
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmctx;
int rc = 0;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
@@ -975,13 +973,12 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (lsmblob_is_set(blob)) {
- if (security_secid_to_secctx(blob, &ctx, &len)) {
+ if (security_secid_to_secctx(blob, &lsmctx)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /*scaffolding*/
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
audit_log_format(ab, " ocomm=");
@@ -1194,7 +1191,6 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
static void show_special(struct audit_context *context, int *call_panic)
{
- struct lsmcontext lsmcxt;
struct audit_buffer *ab;
int i;
@@ -1218,17 +1214,15 @@ static void show_special(struct audit_context *context, int *call_panic)
from_kgid(&init_user_ns, context->ipc.gid),
context->ipc.mode);
if (osid) {
- char *ctx = NULL;
- u32 len;
+ struct lsmcontext lsmcxt;
struct lsmblob blob;
lsmblob_init(&blob, osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmcxt)) {
audit_log_format(ab, " osid=%u", osid);
*call_panic = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0);
+ audit_log_format(ab, " obj=%s", lsmcxt.context);
security_release_secctx(&lsmcxt);
}
}
@@ -1372,20 +1366,17 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
MAJOR(n->rdev),
MINOR(n->rdev));
if (n->osid != 0) {
- char *ctx = NULL;
- u32 len;
struct lsmblob blob;
- struct lsmcontext lsmcxt;
+ struct lsmcontext lsmctx;
lsmblob_init(&blob, n->osid);
- if (security_secid_to_secctx(&blob, &ctx, &len)) {
+ if (security_secid_to_secctx(&blob, &lsmctx)) {
audit_log_format(ab, " osid=%u", n->osid);
if (call_panic)
*call_panic = 2;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0); /* scaffolding */
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 96d56a30ecca..27af7a6b8780 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -132,20 +132,17 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
struct lsmcontext context;
struct lsmblob lb;
- char *secdata;
- u32 seclen;
int err;
err = security_socket_getpeersec_dgram(NULL, skb, &lb);
if (err)
return;
- err = security_secid_to_secctx(&lb, &secdata, &seclen);
+ err = security_secid_to_secctx(&lb, &context);
if (err)
return;
- put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
- lsmcontext_init(&context, secdata, seclen, 0); /* scaffolding */
+ put_cmsg(msg, SOL_IP, SCM_SECURITY, context.len, context.context);
security_release_secctx(&context);
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 2f233f40c926..255bcb886a2f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -329,13 +329,12 @@ static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_secctx;
- int len, ret;
- char *secctx;
+ int ret;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
@@ -344,13 +343,12 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
if (!nest_secctx)
goto nla_put_failure;
- if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
+ if (nla_put_string(skb, CTA_SECCTX_NAME, context.context))
goto nla_put_failure;
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
return ret;
}
@@ -648,12 +646,16 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;
struct lsmblob blob;
+ struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, NULL, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return 0;
+ len = context.len;
+ security_release_secctx(&context);
+
return nla_total_size(0) /* CTA_SECCTX */
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
#else
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 8601fcb99f7a..8969754d7fe9 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -173,19 +173,16 @@ static void ct_seq_stop(struct seq_file *s, void *v)
static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
int ret;
- u32 len;
- char *secctx;
struct lsmblob blob;
struct lsmcontext context;
lsmblob_init(&blob, ct->secmark);
- ret = security_secid_to_secctx(&blob, &secctx, &len);
+ ret = security_secid_to_secctx(&blob, &context);
if (ret)
return;
- seq_printf(s, "secctx=%s ", secctx);
+ seq_printf(s, "secctx=%s ", context.context);
- lsmcontext_init(&context, secctx, len, 0); /* scaffolding */
security_release_secctx(&context);
}
#else
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index cc3ef03ee198..2d6668fd026c 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -306,6 +306,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
struct lsmblob blob;
+ struct lsmcontext context = { };
if (!skb || !sk_fullsock(skb->sk))
return 0;
@@ -314,10 +315,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
if (skb->secmark) {
lsmblob_init(&blob, skb->secmark);
- security_secid_to_secctx(&blob, secdata, &seclen);
+ security_secid_to_secctx(&blob, &context);
+ *secdata = context.context;
}
read_unlock_bh(&skb->sk->sk_callback_lock);
+ seclen = context.len;
#endif
return seclen;
}
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 288c005b44c7..c03fe9a4f7b9 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -374,8 +374,6 @@ int netlbl_unlhsh_add(struct net *net,
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
struct lsmcontext context;
- char *secctx = NULL;
- u32 secctx_len;
struct lsmblob blob;
if (addr_len != sizeof(struct in_addr) &&
@@ -440,12 +438,9 @@ int netlbl_unlhsh_add(struct net *net,
rcu_read_unlock();
if (audit_buf != NULL) {
lsmblob_init(&blob, secid);
- if (security_secid_to_secctx(&blob,
- &secctx,
- &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ if (security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
@@ -478,8 +473,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -503,11 +496,9 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -546,8 +537,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
@@ -570,10 +559,9 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
if (entry != NULL)
lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob,
- &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " sec_obj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " sec_obj=%s",
+ context.context);
security_release_secctx(&context);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
@@ -1091,8 +1079,6 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
struct lsmcontext context;
void *data;
u32 secid;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
@@ -1149,15 +1135,13 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
}
lsmblob_init(&blob, secid);
- ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len);
+ ret_val = security_secid_to_secctx(&blob, &context);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_SECCTX,
- secctx_len,
- secctx);
- /* scaffolding */
- lsmcontext_init(&context, secctx, secctx_len, 0);
+ context.len,
+ context.context);
security_release_secctx(&context);
if (ret_val != 0)
goto list_cb_failure;
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index ef139d8ae7cd..951ba0639d20 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -85,8 +85,6 @@ struct audit_buffer *netlbl_audit_start_common(int type,
{
struct audit_buffer *audit_buf;
struct lsmcontext context;
- char *secctx;
- u32 secctx_len;
struct lsmblob blob;
if (audit_enabled == AUDIT_OFF)
@@ -102,9 +100,8 @@ struct audit_buffer *netlbl_audit_start_common(int type,
lsmblob_init(&blob, audit_info->secid);
if (audit_info->secid != 0 &&
- security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) {
- audit_log_format(audit_buf, " subj=%s", secctx);
- lsmcontext_init(&context, secctx, secctx_len, 0);/*scaffolding*/
+ security_secid_to_secctx(&blob, &context) == 0) {
+ audit_log_format(audit_buf, " subj=%s", context.context);
security_release_secctx(&context);
}
diff --git a/security/security.c b/security/security.c
index 6310ca7e84ed..4ba1a6ed36e0 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2109,18 +2109,22 @@ int security_ismaclabel(const char *name)
}
EXPORT_SYMBOL(security_ismaclabel);
-int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
{
struct security_hook_list *hp;
int display = lsm_task_display(current);
+ memset(cp, 0, sizeof(*cp));
+
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+ if (display == LSMBLOB_INVALID || display == hp->lsmid->slot) {
+ cp->slot = hp->lsmid->slot;
return hp->hook.secid_to_secctx(
blob->secid[hp->lsmid->slot],
- secdata, seclen);
+ &cp->context, &cp->len);
+ }
}
return 0;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
end of thread, other threads:[~2019-12-24 23:21 UTC | newest]
Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20191224231339.7130-1-casey@schaufler-ca.com>
2019-12-24 23:13 ` [PATCH v12 05/25] net: Prepare UDS for security module stacking Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 12/25] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 18/25] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 21/25] Audit: Add subj_LSM fields when necessary Casey Schaufler
2019-12-24 23:13 ` [PATCH v12 23/25] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
2019-12-24 23:18 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
-- strict thread matches above, loose matches on Subject: below --
2019-12-16 22:35 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-16 22:36 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-12-18 16:06 ` Stephen Smalley
2019-12-18 19:33 ` Stephen Smalley
2019-12-16 22:33 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-16 22:33 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-12-16 22:24 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-16 22:24 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
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