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audit: fix exe_file access in audit_exe_compare

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commit 5efc244346 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>
This commit is contained in:
Mateusz Guzik 2016-08-23 16:20:39 +02:00 committed by Greg Kroah-Hartman
parent f750847daa
commit d0259cc85b
1 changed files with 5 additions and 3 deletions
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8
kernel/audit_watch.c
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@ -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);
}