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authorChris Wright <chrisw@osdl.org>2005-05-01 08:58:38 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:58:38 -0700
commit93ea1d0a12623dc1a693642b5758261f35f9bf96 (patch)
tree4938d87a7d269f7b3e53328d02eac259cb93515a /mm
parentedfbe2b0038723e5699ab22695ccd62b5542a5c1 (diff)
[PATCH] RLIMIT_MEMLOCK checking fix
Always use page counts when doing RLIMIT_MEMLOCK checking to avoid possible overflow. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mmap.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 1ec0f6e9c0d8..01f9793591f6 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -937,9 +937,10 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
/* mlock MCL_FUTURE? */
if (vm_flags & VM_LOCKED) {
unsigned long locked, lock_limit;
- locked = mm->locked_vm << PAGE_SHIFT;
+ locked = len >> PAGE_SHIFT;
+ locked += mm->locked_vm;
lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
- locked += len;
+ lock_limit >>= PAGE_SHIFT;
if (locked > lock_limit && !capable(CAP_IPC_LOCK))
return -EAGAIN;
}
@@ -1822,9 +1823,10 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
*/
if (mm->def_flags & VM_LOCKED) {
unsigned long locked, lock_limit;
- locked = mm->locked_vm << PAGE_SHIFT;
+ locked = len >> PAGE_SHIFT;
+ locked += mm->locked_vm;
lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
- locked += len;
+ lock_limit >>= PAGE_SHIFT;
if (locked > lock_limit && !capable(CAP_IPC_LOCK))
return -EAGAIN;
}

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