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authorCyrill Gorcunov <gorcunov@openvz.org>2014-10-09 15:27:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-09 22:25:55 -0400
commit9c5990240e076ae564cccbd921868cd08f6daaa5 (patch)
tree90979d3eadd8ee612b47cc7371ca0dabf99cf537 /include
parent6d7ce55940b6ecd463ca044ad241f0122d913293 (diff)
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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 28df70774b81..4d814aa97785 100644
--- a/include/linux/mm.h
+++ b/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(struct vm_area_struct **,
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);