This is a note to let you know that I've just added the patch titled
audit: fix exe_file access in audit_exe_compare
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
audit-fix-exe_file-access-in-audit_exe_compare.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5efc244346f9f338765da3d592f7947b0afdc4b5 Mon Sep 17 00:00:00 2001
From: Mateusz Guzik <mguzik@xxxxxxxxxx>
Date: Tue, 23 Aug 2016 16:20:39 +0200
Subject: audit: fix exe_file access in audit_exe_compare
From: Mateusz Guzik <mguzik@xxxxxxxxxx>
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@xxxxxxxxxx>
Acked-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Acked-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/audit_watch.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- 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
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);
}
Patches currently in stable-queue which might be from mguzik@xxxxxxxxxx are
queue-4.7/mm-introduce-get_task_exe_file.patch
queue-4.7/audit-fix-exe_file-access-in-audit_exe_compare.patch
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