diff options
| author | Rik van Riel <riel@redhat.com> | 2014-01-02 12:58:46 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-09 12:24:24 -0800 |
| commit | abdd4b8ac01323900fcda70f6d9ee94b873d66e3 (patch) | |
| tree | 6d246224f1abe56bd72862db4611b638625ccbcc /mm/mprotect.c | |
| parent | 398bbc5710f23c0db6ebd4dd30bb331086bd16e7 (diff) | |
mm: fix use-after-free in sys_remap_file_pages
commit 4eb919825e6c3c7fb3630d5621f6d11e98a18b3a upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/mprotect.c')
0 files changed, 0 insertions, 0 deletions