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authorakpm@osdl.org <akpm@osdl.org>2005-05-01 19:58:35 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 19:58:35 +0400
commit119f657c72fc07d6fd28c61de59cfba1566970a9 (patch)
tree33c8070aa904c4919cf244cdcd7c01e54589bb9e /mm/mremap.c
parentf021e9210185b46e41ec3a0e78ec1621e168eacb (diff)
downloadlinux-119f657c72fc07d6fd28c61de59cfba1566970a9.tar.xz
[PATCH] RLIMIT_AS checking fix
Address bug #4508: there's potential for wraparound in the various places where we perform RLIMIT_AS checking. (I'm a bit worried about acct_stack_growth(). Are we sure that vma->vm_mm is always equal to current->mm? If not, then we're comparing some other process's total_vm with the calling process's rlimits). Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index 0d1c1b9c7a0a..0dd7ace94e51 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -347,10 +347,10 @@ unsigned long do_mremap(unsigned long addr,
if (locked > lock_limit && !capable(CAP_IPC_LOCK))
goto out;
}
- ret = -ENOMEM;
- if ((current->mm->total_vm << PAGE_SHIFT) + (new_len - old_len)
- > current->signal->rlim[RLIMIT_AS].rlim_cur)
+ if (!may_expand_vm(current->mm, (new_len - old_len) >> PAGE_SHIFT)) {
+ ret = -ENOMEM;
goto out;
+ }
if (vma->vm_flags & VM_ACCOUNT) {
charged = (new_len - old_len) >> PAGE_SHIFT;