+ mm-introduce-check_data_rlimit-helper-v2.patch added to -mm tree

+ mm-introduce-check_data_rlimit-helper-v2.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: introduce check_data_rlimit helper
has been added to the -mm tree.  Its filename is
     mm-introduce-check_data_rlimit-helper-v2.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-introduce-check_data_rlimit-helper-v2.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-introduce-check_data_rlimit-helper-v2.patch

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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Cyrill Gorcunov <gorcunov@openvz.org>
Subject: mm: introduce check_data_rlimit helper

To eliminate code duplication lets introduce check_data_rlimit helper
which we will use in brk() and prctl() syscalls.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Julien Tinnes <jln@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/mm.h |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff -puN include/linux/mm.h~mm-introduce-check_data_rlimit-helper-v2 include/linux/mm.h
--- a/include/linux/mm.h~mm-introduce-check_data_rlimit-helper-v2
+++ a/include/linux/mm.h
@@ -18,6 +18,7 @@
 #include <linux/pfn.h>
 #include <linux/bit_spinlock.h>
 #include <linux/shrinker.h>
+#include <linux/resource.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -1780,6 +1781,20 @@ extern struct vm_area_struct *copy_vma(s
 	bool *need_rmap_locks);
 extern void exit_mmap(struct mm_struct *);
 
+static inline int check_data_rlimit(unsigned long rlim,
+				    unsigned long new,
+				    unsigned long start,
+				    unsigned long end_data,
+				    unsigned long start_data)
+{
+	if (rlim < RLIM_INFINITY) {
+		if (((new - start) + (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);
 
_

Patches currently in -mm which might be from gorcunov@openvz.org are

mm-introduce-check_data_rlimit-helper-v2.patch
mm-use-may_adjust_brk-helper.patch
prctl-pr_set_mm-factor-out-mmap_sem-when-update-mm-exe_file.patch
prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v3.patch
prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v3-fix.patch
fs-proc-task_mmuc-dont-use-task-mm-in-m_start-and-show_map.patch
fs-proc-task_mmuc-unify-simplify-do_maps_open-and-numa_maps_open.patch
proc-introduce-proc_mem_open.patch
fs-proc-task_mmuc-shift-mm_access-from-m_start-to-proc_maps_open.patch
fs-proc-task_mmuc-simplify-the-vma_stop-logic.patch
fs-proc-task_mmuc-cleanup-the-tail_vma-horror-in-m_next.patch
fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop.patch
fs-proc-task_mmuc-kill-the-suboptimal-and-confusing-m-version-logic.patch
fs-proc-task_mmuc-simplify-m_start-to-make-it-readable.patch
fs-proc-task_mmuc-introduce-m_next_vma-helper.patch
fs-proc-task_mmuc-reintroduce-m-version-logic.patch
fs-proc-task_mmuc-update-m-version-in-the-main-loop-in-m_start.patch
fs-proc-task_nommuc-change-maps_open-to-use-__seq_open_private.patch
fs-proc-task_nommuc-shift-mm_access-from-m_start-to-proc_maps_open.patch
fs-proc-task_nommuc-dont-use-priv-task-mm.patch