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Commit 9c599024 authored by Cyrill Gorcunov's avatar Cyrill Gorcunov Committed by Linus Torvalds
Browse files

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: default avatarCyrill 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: default avatarSerge 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6d7ce559

include/linux/mm.h

+15 −0
Original line number Diff line number Diff line
@@ -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);