tree 6e360ae87c4b393e862b6bb2ab18e8f2cea22797
parent 6b76106d8ef31111d6fc469564b83b5f5542794f
author Dmitry Monakhov <dmonakhov@openvz.org> 1321431708 +0100
committer Jens Axboe <axboe@kernel.dk> 1321431708 +0100

loop: prevent information leak after failed read

If read was not fully successful we have to fail whole bio to prevent
information leak of old pages

##Testcase_begin
dd if=/dev/zero of=./file bs=1M count=1
losetup /dev/loop0 ./file -o 4096
truncate -s 0 ./file
# OOps loop offset is now beyond i_size, so read will silently fail.
# So bio's pages would not be cleared, may which result in information leak.
hexdump -C /dev/loop0
##testcase_end

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>