From: Cyrill Gorcunov <gorcu...@openvz.org>
ML: 9c5990240e076ae564cccbd921868cd08f6daaa5
To eliminate code duplication lets introduce check_data_rlimit helper
which we will use in brk() and prctl() syscalls.
Signed-off-by: Cyrill Gorcunov <gorcu...@openvz.org>
Cc: Kees Cook <keesc...@chromium.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: Andrew Vagin <ava...@openvz.org>
Cc: Eric W. Biederman <ebied...@xmission.com>
Cc: H. Peter Anvin <h...@zytor.com>
Acked-by: 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>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Andrew Vagin <ava...@openvz.org>
---
include/linux/mm.h | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8424c6a..163d3d8 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;
@@ -1747,6 +1748,20 @@ 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);
--
1.7.1
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