Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759620AbaGXQu4 (ORCPT ); Thu, 24 Jul 2014 12:50:56 -0400 Received: from mail-lb0-f182.google.com ([209.85.217.182]:35289 "EHLO mail-lb0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758885AbaGXQuy (ORCPT ); Thu, 24 Jul 2014 12:50:54 -0400 Message-Id: <20140724165047.437075575@openvz.org> User-Agent: quilt/0.60-1 Date: Thu, 24 Jul 2014 20:46:58 +0400 From: Cyrill Gorcunov To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: gorcunov@openvz.org, keescook@chromium.org, tj@kernel.org, akpm@linux-foundation.org, avagin@openvz.org, ebiederm@xmission.com, hpa@zytor.com, serge.hallyn@canonical.com, xemul@parallels.com, segoon@openwall.com, kamezawa.hiroyu@jp.fujitsu.com, mtk.manpages@gmail.com, jln@google.com Subject: [rfc 1/4] mm: Introduce may_adjust_brk helper References: <20140724164657.452106845@openvz.org> Content-Disposition: inline; filename=prctl-add-may_adjust_brk Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To eliminate code duplication lets introduce may_adjust_brk helper which we will use in brk() and prctl() syscalls. Signed-off-by: Cyrill Gorcunov Cc: Kees Cook Cc: Tejun Heo Cc: Andrew Morton Cc: Andrew Vagin Cc: Eric W. Biederman Cc: H. Peter Anvin Cc: Serge Hallyn Cc: Pavel Emelyanov Cc: Vasiliy Kulikov Cc: KAMEZAWA Hiroyuki Cc: Michael Kerrisk Cc: Julien Tinnes --- include/linux/mm.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) Index: linux-2.6.git/include/linux/mm.h =================================================================== --- linux-2.6.git.orig/include/linux/mm.h +++ linux-2.6.git/include/linux/mm.h @@ -18,6 +18,7 @@ #include #include #include +#include struct mempolicy; struct anon_vma; @@ -1780,6 +1781,19 @@ extern struct vm_area_struct *copy_vma(s bool *need_rmap_locks); extern void exit_mmap(struct mm_struct *); +static inline int may_adjust_brk(unsigned long rlim, + unsigned long new_brk, + unsigned long start_brk, + unsigned long end_data, + unsigned long start_data) +{ + if (rlim < RLIMIT_DATA) { + if (((new_brk - start_brk) + (end_data - start_data)) > rlim) + return -ENOSPC; + } + return 0; +} + extern int mm_take_all_locks(struct mm_struct *mm); extern void mm_drop_all_locks(struct mm_struct *mm); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/