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>

diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 656c7e93ac0d30d3e42a8f7e0dfc7dd071360d78..939945a5649c7980f871fac6829ac624683190ac 100644 (file)
--- 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);
 }