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author | Ilya Dryomov <idryomov@gmail.com> | 2015-10-11 19:38:00 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-11-09 14:33:36 -0800 |
commit | 1e335cfce3d1fe07b754f2efd0781e8d58f1e675 (patch) | |
tree | 04d57e663faf50de376eab8d8c7d795831362bb3 /arch/arm | |
parent | 10f560cde4edf75af70eb55c0e55b3a04fcb6b31 (diff) |
rbd: prevent kernel stack blow up on rbd map
commit 6d69bb536bac0d403d83db1ca841444981b280cd upstream.
Mapping an image with a long parent chain (e.g. image foo, whose parent
is bar, whose parent is baz, etc) currently leads to a kernel stack
overflow, due to the following recursion in the reply path:
rbd_osd_req_callback()
rbd_obj_request_complete()
rbd_img_obj_callback()
rbd_img_parent_read_callback()
rbd_obj_request_complete()
...
Limit the parent chain to 16 images, which is ~5K worth of stack. When
the above recursion is eliminated, this limit can be lifted.
Fixes: http://tracker.ceph.com/issues/12538
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>
[idryomov@gmail.com: backport to 4.1: rbd_dev->opts]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm')
0 files changed, 0 insertions, 0 deletions