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mm: use may_adjust_brk helper

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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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cyrill Gorcunov 2014-10-09 15:27:32 -07:00 committed by Linus Torvalds
parent 9c5990240e
commit 8764b338b3
2 changed files with 7 additions and 11 deletions
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11
kernel/sys.c
View File

@ -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, unsigned long addr,
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, unsigned long addr,
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;

7
mm/mmap.c
View File

@ -268,7 +268,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len);
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);