[3.11.y.z extended stable] Patch "coredump: fix the setting of PF_DUMPCORE" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    coredump: fix the setting of PF_DUMPCORE

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 928aeee05e2d0566179b6ba7fb1d783a9fa18fc2 Mon Sep 17 00:00:00 2001
From: Silesh C V <svellattu at mvista.com>
Date: Wed, 23 Jul 2014 13:59:59 -0700
Subject: coredump: fix the setting of PF_DUMPCORE

commit aed8adb7688d5744cb484226820163af31d2499a upstream.

Commit 079148b919d0 ("coredump: factor out the setting of PF_DUMPCORE")
cleaned up the setting of PF_DUMPCORE by removing it from all the
linux_binfmt->core_dump() and moving it to zap_threads().But this ended
up clearing all the previously set flags.  This causes issues during
core generation when tsk->flags is checked again (eg.  for PF_USED_MATH
to dump floating point registers).  Fix this.

Signed-off-by: Silesh C V <svellattu at mvista.com>
Acked-by: Oleg Nesterov <oleg at redhat.com>
Cc: Mandeep Singh Baines <msb at chromium.org>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/coredump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index 729a2ededcb9..b2fa3937a7eb 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -302,7 +302,7 @@ static int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
 	if (unlikely(nr < 0))
 		return nr;

-	tsk->flags = PF_DUMPCORE;
+	tsk->flags |= PF_DUMPCORE;
 	if (atomic_read(&mm->mm_users) == nr + 1)
 		goto done;
 	/*
--
1.9.1