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dm-verity: recheck the hash after a failure
commit 9177f3c upstream. If a userspace process reads (with O_DIRECT) multiple blocks into the same buffer, dm-verity reports an error [1]. This commit fixes dm-verity, so that if hash verification fails, the data is read again into a kernel buffer (where userspace can't modify it) and the hash is rechecked. If the recheck succeeds, the content of the kernel buffer is copied into the user buffer; if the recheck fails, an error is reported. [1] https://people.redhat.com/~mpatocka/testcases/blk-auth-modify/read2.c Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer <snitzer@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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