The patch titled
Subject: mm: use may_adjust_brk helper
has been added to the -mm tree. Its filename is
mm-use-may_adjust_brk-helper.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-use-may_adjust_brk-helper.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-use-may_adjust_brk-helper.patch
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------------------------------------------------------
From: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Subject: mm: use may_adjust_brk helper
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Andrew Vagin <avagin@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Vasiliy Kulikov <segoon@xxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: Julien Tinnes <jln@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 11 ++++-------
mm/mmap.c | 7 +++----
2 files changed, 7 insertions(+), 11 deletions(-)
diff -puN kernel/sys.c~mm-use-may_adjust_brk-helper kernel/sys.c
--- a/kernel/sys.c~mm-use-may_adjust_brk-helper
+++ a/kernel/sys.c
@@ -1693,7 +1693,6 @@ exit:
static int prctl_set_mm(int opt, unsigned long addr,
unsigned long arg4, unsigned long arg5)
{
- unsigned long rlim = rlimit(RLIMIT_DATA);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int error;
@@ -1733,9 +1732,8 @@ static int prctl_set_mm(int opt, unsigne
if (addr <= mm->end_data)
goto out;
- if (rlim < RLIM_INFINITY &&
- (mm->brk - addr) +
- (mm->end_data - mm->start_data) > rlim)
+ if (check_data_rlimit(rlimit(RLIMIT_DATA), mm->brk, addr,
+ mm->end_data, mm->start_data))
goto out;
mm->start_brk = addr;
@@ -1745,9 +1743,8 @@ static int prctl_set_mm(int opt, unsigne
if (addr <= mm->end_data)
goto out;
- if (rlim < RLIM_INFINITY &&
- (addr - mm->start_brk) +
- (mm->end_data - mm->start_data) > rlim)
+ if (check_data_rlimit(rlimit(RLIMIT_DATA), addr, mm->start_brk,
+ mm->end_data, mm->start_data))
goto out;
mm->brk = addr;
diff -puN mm/mmap.c~mm-use-may_adjust_brk-helper mm/mmap.c
--- a/mm/mmap.c~mm-use-may_adjust_brk-helper
+++ a/mm/mmap.c
@@ -268,7 +268,7 @@ static unsigned long do_brk(unsigned lon
SYSCALL_DEFINE1(brk, unsigned long, brk)
{
- unsigned long rlim, retval;
+ unsigned long retval;
unsigned long newbrk, oldbrk;
struct mm_struct *mm = current->mm;
unsigned long min_brk;
@@ -298,9 +298,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
* segment grow beyond its set limit the in case where the limit is
* not page aligned -Ram Gupta
*/
- rlim = rlimit(RLIMIT_DATA);
- if (rlim < RLIM_INFINITY && (brk - mm->start_brk) +
- (mm->end_data - mm->start_data) > rlim)
+ if (check_data_rlimit(rlimit(RLIMIT_DATA), brk, mm->start_brk,
+ mm->end_data, mm->start_data))
goto out;
newbrk = PAGE_ALIGN(brk);
_
Patches currently in -mm which might be from gorcunov@xxxxxxxxxx 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
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