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From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: casey@schaufler-ca.com, linux-audit@redhat.com,
	keescook@chromium.org, john.johansen@canonical.com,
	penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com,
	sds@tycho.nsa.gov, linux-kernel@vger.kernel.org
Subject: [PATCH v22 07/23] LSM: Use lsmblob in security_ipc_getsecid
Date: Wed,  4 Nov 2020 15:40:58 -0800	[thread overview]
Message-ID: <20201104234114.11346-8-casey@schaufler-ca.com> (raw)
In-Reply-To: <20201104234114.11346-1-casey@schaufler-ca.com>

There may be more than one LSM that provides IPC data
for auditing. Change security_ipc_getsecid() to fill in
a lsmblob structure instead of the u32 secid. The
audit data structure containing the secid will be updated
later, so there is a bit of scaffolding here.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: linux-audit@redhat.com
---
 include/linux/security.h |  7 ++++---
 kernel/auditsc.c         |  7 ++++++-
 security/security.c      | 12 +++++++++---
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/include/linux/security.h b/include/linux/security.h
index fad361bf320e..be8db737da74 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -499,7 +499,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
 			unsigned long arg4, unsigned long arg5);
 void security_task_to_inode(struct task_struct *p, struct inode *inode);
 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag);
-void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid);
+void security_ipc_getsecid(struct kern_ipc_perm *ipcp, struct lsmblob *blob);
 int security_msg_msg_alloc(struct msg_msg *msg);
 void security_msg_msg_free(struct msg_msg *msg);
 int security_msg_queue_alloc(struct kern_ipc_perm *msq);
@@ -1228,9 +1228,10 @@ static inline int security_ipc_permission(struct kern_ipc_perm *ipcp,
 	return 0;
 }
 
-static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
+static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp,
+					 struct lsmblob *blob)
 {
-	*secid = 0;
+	lsmblob_init(blob, 0);
 }
 
 static inline int security_msg_msg_alloc(struct msg_msg *msg)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 5f9bdd62f78d..35d6bd0526a2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2341,11 +2341,16 @@ void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
 {
 	struct audit_context *context = audit_context();
+	struct lsmblob blob;
 	context->ipc.uid = ipcp->uid;
 	context->ipc.gid = ipcp->gid;
 	context->ipc.mode = ipcp->mode;
 	context->ipc.has_perm = 0;
-	security_ipc_getsecid(ipcp, &context->ipc.osid);
+	security_ipc_getsecid(ipcp, &blob);
+	/* context->ipc.osid will be changed to a lsmblob later in
+	 * the patch series. This will allow auditing of all the object
+	 * labels associated with the ipc object. */
+	context->ipc.osid = lsmblob_value(&blob);
 	context->type = AUDIT_IPC;
 }
 
diff --git a/security/security.c b/security/security.c
index ea927a00de18..9c1098ecea03 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1882,10 +1882,16 @@ int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
 	return call_int_hook(ipc_permission, 0, ipcp, flag);
 }
 
-void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
+void security_ipc_getsecid(struct kern_ipc_perm *ipcp, struct lsmblob *blob)
 {
-	*secid = 0;
-	call_void_hook(ipc_getsecid, ipcp, secid);
+	struct security_hook_list *hp;
+
+	lsmblob_init(blob, 0);
+	hlist_for_each_entry(hp, &security_hook_heads.ipc_getsecid, list) {
+		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+			continue;
+		hp->hook.ipc_getsecid(ipcp, &blob->secid[hp->lsmid->slot]);
+	}
 }
 
 int security_msg_msg_alloc(struct msg_msg *msg)
-- 
2.24.1


WARNING: multiple messages have this Message-ID (diff)
From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: john.johansen@canonical.com, linux-kernel@vger.kernel.org,
	linux-audit@redhat.com, sds@tycho.nsa.gov
Subject: [PATCH v22 07/23] LSM: Use lsmblob in security_ipc_getsecid
Date: Wed,  4 Nov 2020 15:40:58 -0800	[thread overview]
Message-ID: <20201104234114.11346-8-casey@schaufler-ca.com> (raw)
In-Reply-To: <20201104234114.11346-1-casey@schaufler-ca.com>

There may be more than one LSM that provides IPC data
for auditing. Change security_ipc_getsecid() to fill in
a lsmblob structure instead of the u32 secid. The
audit data structure containing the secid will be updated
later, so there is a bit of scaffolding here.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: linux-audit@redhat.com
---
 include/linux/security.h |  7 ++++---
 kernel/auditsc.c         |  7 ++++++-
 security/security.c      | 12 +++++++++---
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/include/linux/security.h b/include/linux/security.h
index fad361bf320e..be8db737da74 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -499,7 +499,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
 			unsigned long arg4, unsigned long arg5);
 void security_task_to_inode(struct task_struct *p, struct inode *inode);
 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag);
-void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid);
+void security_ipc_getsecid(struct kern_ipc_perm *ipcp, struct lsmblob *blob);
 int security_msg_msg_alloc(struct msg_msg *msg);
 void security_msg_msg_free(struct msg_msg *msg);
 int security_msg_queue_alloc(struct kern_ipc_perm *msq);
@@ -1228,9 +1228,10 @@ static inline int security_ipc_permission(struct kern_ipc_perm *ipcp,
 	return 0;
 }
 
-static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
+static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp,
+					 struct lsmblob *blob)
 {
-	*secid = 0;
+	lsmblob_init(blob, 0);
 }
 
 static inline int security_msg_msg_alloc(struct msg_msg *msg)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 5f9bdd62f78d..35d6bd0526a2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2341,11 +2341,16 @@ void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
 {
 	struct audit_context *context = audit_context();
+	struct lsmblob blob;
 	context->ipc.uid = ipcp->uid;
 	context->ipc.gid = ipcp->gid;
 	context->ipc.mode = ipcp->mode;
 	context->ipc.has_perm = 0;
-	security_ipc_getsecid(ipcp, &context->ipc.osid);
+	security_ipc_getsecid(ipcp, &blob);
+	/* context->ipc.osid will be changed to a lsmblob later in
+	 * the patch series. This will allow auditing of all the object
+	 * labels associated with the ipc object. */
+	context->ipc.osid = lsmblob_value(&blob);
 	context->type = AUDIT_IPC;
 }
 
diff --git a/security/security.c b/security/security.c
index ea927a00de18..9c1098ecea03 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1882,10 +1882,16 @@ int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
 	return call_int_hook(ipc_permission, 0, ipcp, flag);
 }
 
-void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
+void security_ipc_getsecid(struct kern_ipc_perm *ipcp, struct lsmblob *blob)
 {
-	*secid = 0;
-	call_void_hook(ipc_getsecid, ipcp, secid);
+	struct security_hook_list *hp;
+
+	lsmblob_init(blob, 0);
+	hlist_for_each_entry(hp, &security_hook_heads.ipc_getsecid, list) {
+		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
+			continue;
+		hp->hook.ipc_getsecid(ipcp, &blob->secid[hp->lsmid->slot]);
+	}
 }
 
 int security_msg_msg_alloc(struct msg_msg *msg)
-- 
2.24.1

--
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Linux-audit@redhat.com
https://www.redhat.com/mailman/listinfo/linux-audit


  parent reply	other threads:[~2020-11-04 23:50 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20201104234114.11346-1-casey.ref@schaufler-ca.com>
2020-11-04 23:40 ` [PATCH v22 00/23] LSM: Module stacking for AppArmor Casey Schaufler
2020-11-04 23:40   ` Casey Schaufler
2020-11-04 23:40   ` [PATCH v22 01/23] LSM: Infrastructure management of the sock security Casey Schaufler
2020-11-04 23:40     ` Casey Schaufler
2020-11-04 23:40   ` [PATCH v22 02/23] LSM: Create and manage the lsmblob data structure Casey Schaufler
2020-11-04 23:40     ` Casey Schaufler
2020-11-04 23:40   ` [PATCH v22 03/23] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2020-11-04 23:40     ` Casey Schaufler
2020-11-04 23:40   ` [PATCH v22 04/23] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2020-11-04 23:40     ` Casey Schaufler
2020-11-04 23:40   ` [PATCH v22 05/23] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2020-11-04 23:40     ` Casey Schaufler
2020-11-04 23:40   ` [PATCH v22 06/23] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2020-11-04 23:40     ` Casey Schaufler
2020-11-04 23:40   ` Casey Schaufler [this message]
2020-11-04 23:40     ` [PATCH v22 07/23] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2020-11-04 23:40   ` [PATCH v22 08/23] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2020-11-04 23:40     ` Casey Schaufler
2020-11-04 23:41   ` [PATCH v22 09/23] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2020-11-04 23:41     ` Casey Schaufler
2020-11-04 23:41   ` [PATCH v22 10/23] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2020-11-04 23:41     ` Casey Schaufler
2020-11-04 23:41   ` [PATCH v22 11/23] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2020-11-04 23:41     ` Casey Schaufler
2020-11-04 23:41   ` [PATCH v22 12/23] LSM: Specify which LSM to display Casey Schaufler
2020-11-04 23:41     ` Casey Schaufler
2020-11-05  9:22     ` Greg KH
2020-11-05  9:22       ` Greg KH
2020-11-07  0:20       ` Casey Schaufler
2020-11-07  0:20         ` Casey Schaufler
2020-11-07  9:15         ` Greg KH
2020-11-07  9:15           ` Greg KH
2020-11-07 22:05           ` John Johansen
2020-11-07 22:05             ` John Johansen
2020-11-09 22:28             ` Casey Schaufler
2020-11-09 22:28               ` Casey Schaufler
2020-11-09 22:47               ` John Johansen
2020-11-09 22:47                 ` John Johansen
2020-11-04 23:41   ` [PATCH v22 13/23] LSM: Ensure the correct LSM context releaser Casey Schaufler
2020-11-04 23:41     ` Casey Schaufler
2020-11-04 23:41   ` [PATCH v22 14/23] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2020-11-04 23:41     ` Casey Schaufler
2020-11-05  0:49 [PATCH v22 00/23] LSM: Module stacking for AppArmor Casey Schaufler
2020-11-05  0:49 ` [PATCH v22 07/23] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2020-11-05  0:49   ` Casey Schaufler

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