Signed-off-by: Cyrill Gorcunov <gorcu...@openvz.org>
Cc: Kees Cook <keesc...@chromium.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Andrew Vagin <ava...@openvz.org>
Cc: Eric W. Biederman <ebied...@xmission.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Serge Hallyn <serge.hal...@canonical.com>
Cc: Pavel Emelyanov <xe...@parallels.com>
Cc: Vasiliy Kulikov <seg...@openwall.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hir...@jp.fujitsu.com>
Cc: Michael Kerrisk <mtk.manpa...@gmail.com>
Cc: Julien Tinnes <j...@google.com>
---
kernel/sys.c | 10 ++++------
mm/mmap.c | 7 +++----
2 files changed, 7 insertions(+), 10 deletions(-)
Index: linux-2.6.git/kernel/sys.c
===================================================================
--- linux-2.6.git.orig/kernel/sys.c
+++ linux-2.6.git/kernel/sys.c
@@ -1733,9 +1733,8 @@ 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 (may_adjust_brk(rlim, mm->brk, addr,
+ mm->end_data, mm->start_data))
goto out;
mm->start_brk = addr;
@@ -1745,9 +1744,8 @@ 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 (may_adjust_brk(rlim, addr, mm->start_brk,
+ mm->end_data, mm->start_data))
goto out;
mm->brk = addr;
Index: linux-2.6.git/mm/mmap.c
===================================================================
--- linux-2.6.git.orig/mm/mmap.c
+++ linux-2.6.git/mm/mmap.c
@@ -263,7 +263,7 @@ 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;
@@ -293,9 +293,8 @@ 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 (may_adjust_brk(rlimit(RLIMIT_DATA), brk, mm->start_brk,
+ mm->end_data, mm->start_data))
goto out;
newbrk = PAGE_ALIGN(brk);
--
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