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| author | Chris Wright <chrisw@osdl.org> | 2005-05-01 08:58:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 08:58:38 -0700 |
| commit | 93ea1d0a12623dc1a693642b5758261f35f9bf96 (patch) | |
| tree | 4938d87a7d269f7b3e53328d02eac259cb93515a /mm/mmap.c | |
| parent | edfbe2b0038723e5699ab22695ccd62b5542a5c1 (diff) | |
| download | linux-93ea1d0a12623dc1a693642b5758261f35f9bf96.tar.gz linux-93ea1d0a12623dc1a693642b5758261f35f9bf96.tar.bz2 linux-93ea1d0a12623dc1a693642b5758261f35f9bf96.zip | |
[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/mmap.c')
| -rw-r--r-- | mm/mmap.c | 10 |
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; } |