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| author | Richard Guy Briggs <rgb@redhat.com> | 2015-08-08 10:20:25 -0400 |
|---|---|---|
| committer | Paul Moore <pmoore@redhat.com> | 2015-08-12 22:04:07 -0400 |
| commit | 15ce414b82b07acb99afda6e4d9bd14f317b6011 (patch) | |
| tree | 4c706f80ba2464f2c94734890b637afdc912f132 | |
| parent | 34d99af52ad40bd498ba66970579a5bc1fb1a3bc (diff) | |
| download | lwn-15ce414b82b07acb99afda6e4d9bd14f317b6011.tar.gz lwn-15ce414b82b07acb99afda6e4d9bd14f317b6011.zip | |
fixup: audit: implement audit by executable
The Intel build-bot detected a sparse warning with with a patch I posted a
couple of days ago that was accepted in the audit/next tree:
Subject: [linux-next:master 6689/6751] kernel/audit_watch.c:543:36: sparse: dereference of noderef expression
Date: Friday, August 07, 2015, 06:57:55 PM
From: kbuild test robot <fengguang.wu@intel.com>
tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: e6455bc5b91f41f842f30465c9193320f0568707
commit: 2e3a8aeb63e5335d4f837d453787c71bcb479796 [6689/6751] Merge remote- tracking branch 'audit/next'
sparse warnings: (new ones prefixed by >>)
>> kernel/audit_watch.c:543:36: sparse: dereference of noderef expression
kernel/audit_watch.c:544:28: sparse: dereference of noderef expression
34d99af5 Richard Guy Briggs 2015-08-05 541 int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark)
34d99af5 Richard Guy Briggs 2015-08-05 542 {
34d99af5 Richard Guy Briggs 2015-08-05 @543 unsigned long ino = tsk->mm- >exe_file->f_inode->i_ino;
34d99af5 Richard Guy Briggs 2015-08-05 544 dev_t dev = tsk->mm->exe_file- >f_inode->i_sb->s_dev;
:::::: The code at line 543 was first introduced by commit
:::::: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc audit: implement audit by executable
tsk->mm->exe_file requires RCU access. The warning was reproduceable by adding
"C=1 CF=-D__CHECK_ENDIAN__" to the build command, and verified eliminated with
this patch.
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
| -rw-r--r-- | kernel/audit_watch.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c index 27ef8dcf7cd8..359035caac88 100644 --- a/kernel/audit_watch.c +++ b/kernel/audit_watch.c @@ -540,8 +540,14 @@ int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old) int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark) { - unsigned long ino = tsk->mm->exe_file->f_inode->i_ino; - dev_t dev = tsk->mm->exe_file->f_inode->i_sb->s_dev; - + struct file *exe_file; + unsigned long ino; + dev_t dev; + + rcu_read_lock(); + exe_file = rcu_dereference(tsk->mm->exe_file); + ino = exe_file->f_inode->i_ino; + dev = exe_file->f_inode->i_sb->s_dev; + rcu_read_unlock(); return audit_mark_compare(mark, ino, dev); } |