From: Casey Schaufler <casey@schaufler-ca.com>
To: jmorris@namei.org, linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, selinux@vger.kernel.org
Cc: john.johansen@canonical.com, keescook@chromium.org,
penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com,
linux-fsdevel@vger.kernel.org, sds@tycho.nsa.gov,
adobriyan@gmail.com, mic@digikod.net, s.mesoraca16@gmail.com,
casey@schaufler-ca.com
Subject: [PATCH v5 26/38] TOMOYO: Abstract use of cred security blob
Date: Tue, 11 Dec 2018 14:43:02 -0800 [thread overview]
Message-ID: <20181211224314.22412-27-casey@schaufler-ca.com> (raw)
In-Reply-To: <20181211224314.22412-1-casey@schaufler-ca.com>
Don't use the cred->security pointer directly.
Provide helper functions that provide the security blob pointer.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
[kees: adjusted for ordered init series]
Signed-off-by: Kees Cook <keescook@chromium.org>
---
security/tomoyo/common.h | 21 +++++++++++++++++++--
security/tomoyo/domain.c | 4 +++-
security/tomoyo/securityfs_if.c | 15 +++++++++++----
security/tomoyo/tomoyo.c | 40 +++++++++++++++++++++++++++++++---------
4 files changed, 64 insertions(+), 16 deletions(-)
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 539bcdd30bb8..41898613d93b 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -29,6 +29,7 @@
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/un.h>
+#include <linux/lsm_hooks.h>
#include <net/sock.h>
#include <net/af_unix.h>
#include <net/ip.h>
@@ -1062,6 +1063,7 @@ void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
/********** External variable definitions. **********/
extern bool tomoyo_policy_loaded;
+extern int tomoyo_enabled;
extern const char * const tomoyo_condition_keyword
[TOMOYO_MAX_CONDITION_KEYWORD];
extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
@@ -1196,6 +1198,17 @@ static inline void tomoyo_put_group(struct tomoyo_group *group)
atomic_dec(&group->head.users);
}
+/**
+ * tomoyo_cred - Get a pointer to the tomoyo cred security blob
+ * @cred - the relevant cred
+ *
+ * Returns pointer to the tomoyo cred blob.
+ */
+static inline struct tomoyo_domain_info **tomoyo_cred(const struct cred *cred)
+{
+ return (struct tomoyo_domain_info **)&cred->security;
+}
+
/**
* tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
*
@@ -1203,7 +1216,9 @@ static inline void tomoyo_put_group(struct tomoyo_group *group)
*/
static inline struct tomoyo_domain_info *tomoyo_domain(void)
{
- return current_cred()->security;
+ struct tomoyo_domain_info **blob = tomoyo_cred(current_cred());
+
+ return *blob;
}
/**
@@ -1216,7 +1231,9 @@ static inline struct tomoyo_domain_info *tomoyo_domain(void)
static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
*task)
{
- return task_cred_xxx(task, security);
+ struct tomoyo_domain_info **blob = tomoyo_cred(get_task_cred(task));
+
+ return *blob;
}
/**
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index f6758dad981f..b7469fdbff01 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -678,6 +678,7 @@ static int tomoyo_environ(struct tomoyo_execve *ee)
*/
int tomoyo_find_next_domain(struct linux_binprm *bprm)
{
+ struct tomoyo_domain_info **blob;
struct tomoyo_domain_info *old_domain = tomoyo_domain();
struct tomoyo_domain_info *domain = NULL;
const char *original_name = bprm->filename;
@@ -843,7 +844,8 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
domain = old_domain;
/* Update reference count on "struct tomoyo_domain_info". */
atomic_inc(&domain->users);
- bprm->cred->security = domain;
+ blob = tomoyo_cred(bprm->cred);
+ *blob = domain;
kfree(exename.name);
if (!retval) {
ee->r.domain = domain;
diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
index 1d3d7e7a1f05..768dff9608b1 100644
--- a/security/tomoyo/securityfs_if.c
+++ b/security/tomoyo/securityfs_if.c
@@ -71,9 +71,12 @@ static ssize_t tomoyo_write_self(struct file *file, const char __user *buf,
if (!cred) {
error = -ENOMEM;
} else {
- struct tomoyo_domain_info *old_domain =
- cred->security;
- cred->security = new_domain;
+ struct tomoyo_domain_info **blob;
+ struct tomoyo_domain_info *old_domain;
+
+ blob = tomoyo_cred(cred);
+ old_domain = *blob;
+ *blob = new_domain;
atomic_inc(&new_domain->users);
atomic_dec(&old_domain->users);
commit_creds(cred);
@@ -234,10 +237,14 @@ static void __init tomoyo_create_entry(const char *name, const umode_t mode,
*/
static int __init tomoyo_initerface_init(void)
{
+ struct tomoyo_domain_info *domain;
struct dentry *tomoyo_dir;
+ if (!tomoyo_enabled)
+ return 0;
+ domain = tomoyo_domain();
/* Don't create securityfs entries unless registered. */
- if (current_cred()->security != &tomoyo_kernel_domain)
+ if (domain != &tomoyo_kernel_domain)
return 0;
tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index daff7d7897ad..15864307925d 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -18,7 +18,9 @@
*/
static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
{
- new->security = NULL;
+ struct tomoyo_domain_info **blob = tomoyo_cred(new);
+
+ *blob = NULL;
return 0;
}
@@ -34,8 +36,13 @@ static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
gfp_t gfp)
{
- struct tomoyo_domain_info *domain = old->security;
- new->security = domain;
+ struct tomoyo_domain_info **old_blob = tomoyo_cred(old);
+ struct tomoyo_domain_info **new_blob = tomoyo_cred(new);
+ struct tomoyo_domain_info *domain;
+
+ domain = *old_blob;
+ *new_blob = domain;
+
if (domain)
atomic_inc(&domain->users);
return 0;
@@ -59,7 +66,9 @@ static void tomoyo_cred_transfer(struct cred *new, const struct cred *old)
*/
static void tomoyo_cred_free(struct cred *cred)
{
- struct tomoyo_domain_info *domain = cred->security;
+ struct tomoyo_domain_info **blob = tomoyo_cred(cred);
+ struct tomoyo_domain_info *domain = *blob;
+
if (domain)
atomic_dec(&domain->users);
}
@@ -73,6 +82,9 @@ static void tomoyo_cred_free(struct cred *cred)
*/
static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
{
+ struct tomoyo_domain_info **blob;
+ struct tomoyo_domain_info *domain;
+
/*
* Do only if this function is called for the first time of an execve
* operation.
@@ -93,13 +105,14 @@ static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
* stored inside "bprm->cred->security" will be acquired later inside
* tomoyo_find_next_domain().
*/
- atomic_dec(&((struct tomoyo_domain_info *)
- bprm->cred->security)->users);
+ blob = tomoyo_cred(bprm->cred);
+ domain = *blob;
+ atomic_dec(&domain->users);
/*
* Tell tomoyo_bprm_check_security() is called for the first time of an
* execve operation.
*/
- bprm->cred->security = NULL;
+ *blob = NULL;
return 0;
}
@@ -112,8 +125,11 @@ static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
*/
static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
{
- struct tomoyo_domain_info *domain = bprm->cred->security;
+ struct tomoyo_domain_info **blob;
+ struct tomoyo_domain_info *domain;
+ blob = tomoyo_cred(bprm->cred);
+ domain = *blob;
/*
* Execute permission is checked against pathname passed to do_execve()
* using current domain.
@@ -531,6 +547,8 @@ static struct security_hook_list tomoyo_hooks[] __lsm_ro_after_init = {
/* Lock for GC. */
DEFINE_SRCU(tomoyo_ss);
+int tomoyo_enabled __lsm_ro_after_init = 1;
+
/**
* tomoyo_init - Register TOMOYO Linux as a LSM module.
*
@@ -539,17 +557,21 @@ DEFINE_SRCU(tomoyo_ss);
static int __init tomoyo_init(void)
{
struct cred *cred = (struct cred *) current_cred();
+ struct tomoyo_domain_info **blob;
/* register ourselves with the security framework */
security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo");
printk(KERN_INFO "TOMOYO Linux initialized\n");
- cred->security = &tomoyo_kernel_domain;
+ blob = tomoyo_cred(cred);
+ *blob = &tomoyo_kernel_domain;
tomoyo_mm_init();
+
return 0;
}
DEFINE_LSM(tomoyo) = {
.name = "tomoyo",
+ .enabled = &tomoyo_enabled,
.flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
.init = tomoyo_init,
};
--
2.14.5
next prev parent reply other threads:[~2018-12-11 22:45 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-11 22:42 [PATCH v5 00/38] LSM: Module stacking for SARA and Landlock Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 01/38] LSM: Introduce LSM_FLAG_LEGACY_MAJOR Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 02/38] LSM: Provide separate ordered initialization Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 03/38] LSM: Plumb visibility into optional "enabled" state Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 04/38] LSM: Lift LSM selection out of individual LSMs Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 05/38] LSM: Build ordered list of LSMs to initialize Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 06/38] LSM: Introduce CONFIG_LSM Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 07/38] LSM: Introduce "lsm=" for boottime LSM selection Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 08/38] LSM: Tie enabling logic to presence in ordered list Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 09/38] LSM: Prepare for reorganizing "security=" logic Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 10/38] LSM: Refactor "security=" in terms of enable/disable Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 11/38] LSM: Separate idea of "major" LSM from "exclusive" LSM Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 12/38] apparmor: Remove SECURITY_APPARMOR_BOOTPARAM_VALUE Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 13/38] selinux: Remove SECURITY_SELINUX_BOOTPARAM_VALUE Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 14/38] LSM: Add all exclusive LSMs to ordered initialization Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 15/38] LSM: Split LSM preparation from initialization Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 16/38] LoadPin: Initialize as ordered LSM Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 17/38] Yama: " Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 18/38] LSM: Introduce enum lsm_order Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 19/38] capability: Initialize as LSM_ORDER_FIRST Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 20/38] procfs: add smack subdir to attrs Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 21/38] Smack: Abstract use of cred security blob Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 22/38] SELinux: " Casey Schaufler
2018-12-11 22:42 ` [PATCH v5 23/38] SELinux: Remove cred security blob poisoning Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 24/38] SELinux: Remove unused selinux_is_enabled Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 25/38] AppArmor: Abstract use of cred security blob Casey Schaufler
2018-12-11 22:43 ` Casey Schaufler [this message]
2018-12-11 22:43 ` [PATCH v5 27/38] Infrastructure management of the " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 28/38] SELinux: Abstract use of file " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 29/38] Smack: " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 30/38] LSM: Infrastructure management of the file security Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 31/38] SELinux: Abstract use of inode security blob Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 32/38] Smack: " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 33/38] LSM: Infrastructure management of the inode security Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 34/38] LSM: Infrastructure management of the task security Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 35/38] SELinux: Abstract use of ipc security blobs Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 36/38] Smack: " Casey Schaufler
2018-12-11 22:43 ` [PATCH v5 37/38] LSM: Infrastructure management of the ipc security blob Casey Schaufler
2018-12-12 16:05 ` [PATCH v5 38/38] TOMOYO: Update LSM flags to no longer be exclusive Casey Schaufler
-- strict thread matches above, loose matches on Subject: below --
2018-11-26 23:22 [PATCH v5 00/38] LSM: Module stacking for SARA and Landlock Casey Schaufler
2018-11-26 23:46 ` [PATCH v5 26/38] TOMOYO: Abstract use of cred security blob Casey Schaufler
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181211224314.22412-27-casey@schaufler-ca.com \
--to=casey@schaufler-ca.com \
--cc=adobriyan@gmail.com \
--cc=jmorris@namei.org \
--cc=john.johansen@canonical.com \
--cc=keescook@chromium.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=mic@digikod.net \
--cc=paul@paul-moore.com \
--cc=penguin-kernel@i-love.sakura.ne.jp \
--cc=s.mesoraca16@gmail.com \
--cc=sds@tycho.nsa.gov \
--cc=selinux@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).