From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759725AbZDWHvv (ORCPT ); Thu, 23 Apr 2009 03:51:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757337AbZDWHdq (ORCPT ); Thu, 23 Apr 2009 03:33:46 -0400 Received: from sous-sol.org ([216.99.217.87]:50976 "EHLO x200.localdomain" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757284AbZDWHdp (ORCPT ); Thu, 23 Apr 2009 03:33:45 -0400 Message-Id: <20090423072839.770227835@sous-sol.org> User-Agent: quilt/0.47-1 Date: Thu, 23 Apr 2009 00:21:32 -0700 From: Chris Wright To: linux-kernel@vger.kernel.org, stable@kernel.org, jejb@kernel.org Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , Willy Tarreau , Rodrigo Rubira Branco , Jake Edge , Eugene Teo , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Hugh Dickins Subject: [patch 072/100] mm: pass correct mm when growing stack References: <20090423072020.428683652@sous-sol.org> Content-Disposition: inline; filename=mm-pass-correct-mm-when-growing-stack.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org -stable review patch. If anyone has any objections, please let us know. --------------------- From: Hugh Dickins upstream commit: 05fa199d45c54a9bda7aa3ae6537253d6f097aa9 Tetsuo Handa reports seeing the WARN_ON(current->mm == NULL) in security_vm_enough_memory(), when do_execve() is touching the target mm's stack, to set up its args and environment. Yes, a UMH_NO_WAIT or UMH_WAIT_PROC call_usermodehelper() spawns an mm-less kernel thread to do the exec. And in any case, that vm_enough_memory check when growing stack ought to be done on the target mm, not on the execer's mm (though apart from the warning, it only makes a slight tweak to OVERCOMMIT_NEVER behaviour). Reported-by: Tetsuo Handa Signed-off-by: Hugh Dickins Cc: stable@kernel.org Signed-off-by: Linus Torvalds Signed-off-by: Chris Wright --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1571,7 +1571,7 @@ static int acct_stack_growth(struct vm_a * Overcommit.. This must be the final test, as it will * update security statistics. */ - if (security_vm_enough_memory(grow)) + if (security_vm_enough_memory_mm(mm, grow)) return -ENOMEM; /* Ok, everything looks good - let it rip */