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| author | Mateusz Guzik <mguzik@redhat.com> | 2016-08-23 16:20:39 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-24 10:09:28 +0200 |
| commit | 7bac8850af69c9322a9ee32a6cc449d02eccb01f (patch) | |
| tree | c01ea04ed0dffd01b5f463167fd5d7c562e23882 /kernel | |
| parent | 2daa86f541b8fa873c56b3cc2c8dc32e03b864fc (diff) | |
| download | linux-stable-7bac8850af69c9322a9ee32a6cc449d02eccb01f.tar.gz linux-stable-7bac8850af69c9322a9ee32a6cc449d02eccb01f.tar.bz2 linux-stable-7bac8850af69c9322a9ee32a6cc449d02eccb01f.zip | |
audit: fix exe_file access in audit_exe_compare
commit 5efc244346f9f338765da3d592f7947b0afdc4b5 upstream.
Prior to the change the function would blindly deference mm, exe_file
and exe_file->f_inode, each of which could have been NULL or freed.
Use get_task_exe_file to safely obtain stable exe_file.
Signed-off-by: Mateusz Guzik <mguzik@redhat.com>
Acked-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/audit_watch.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c index d6709eb70970..0d302a87f21b 100644 --- a/kernel/audit_watch.c +++ b/kernel/audit_watch.c @@ -19,6 +19,7 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#include <linux/file.h> #include <linux/kernel.h> #include <linux/audit.h> #include <linux/kthread.h> @@ -544,10 +545,11 @@ int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark) unsigned long ino; dev_t dev; - rcu_read_lock(); - exe_file = rcu_dereference(tsk->mm->exe_file); + exe_file = get_task_exe_file(tsk); + if (!exe_file) + return 0; ino = exe_file->f_inode->i_ino; dev = exe_file->f_inode->i_sb->s_dev; - rcu_read_unlock(); + fput(exe_file); return audit_mark_compare(mark, ino, dev); } |