diff options
| author | Rik van Riel <riel@redhat.com> | 2014-01-02 12:58:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-02 14:40:30 -0800 |
| commit | 4eb919825e6c3c7fb3630d5621f6d11e98a18b3a (patch) | |
| tree | 826d9e3d7852f7d2214a31bcca050bcd5573e667 /mm/swap.c | |
| parent | 3b25df93c6e37e323b86a2a8c1e00c0a2821c6c9 (diff) | |
mm: fix use-after-free in sys_remap_file_pages
remap_file_pages calls mmap_region, which may merge the VMA with other
existing VMAs, and free "vma". This can lead to a use-after-free bug.
Avoid the bug by remembering vm_flags before calling mmap_region, and
not trying to dereference vma later.
Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: PaX Team <pageexec@freemail.hu>
Cc: Kees Cook <keescook@chromium.org>
Cc: Michel Lespinasse <walken@google.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap.c')
0 files changed, 0 insertions, 0 deletions