The commit is pushed to "branch-rh7-3.10.0-229.7.2.vz7.8.x-ovz" and will appear
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-229.7.2.vz7.8.8
------>
commit 7ed80b3f04e73e8692127a134efade3101ec2122
Author: Cyrill Gorcunov <[email protected]>
Date: Tue Oct 20 13:28:01 2015 +0400
ms/mm: use may_adjust_brk helper
This is needed for CRIU.
ML: 8764b338b37524ab1a78aee527318ebee9762487
https://jira.sw.ru/browse/PSBM-39834
Signed-off-by: Cyrill Gorcunov <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Andrew Vagin <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Cc: Vasiliy Kulikov <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Cc: Julien Tinnes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Cyrill Gorcunov <[email protected]>
---
kernel/sys.c | 11 ++++-------
mm/mmap.c | 7 +++----
2 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/kernel/sys.c b/kernel/sys.c
index 737d9da..9218fde 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2279,7 +2279,6 @@ out:
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;
@@ -2330,9 +2329,8 @@ 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;
@@ -2342,9 +2340,8 @@ 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;
diff --git a/mm/mmap.c b/mm/mmap.c
index 7cc9812..8796ed6 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -272,7 +272,7 @@ static unsigned long do_brk(unsigned long addr, unsigned
long len, int soft);
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;
@@ -302,9 +302,8 @@ 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);
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