dm-integrity: recheck the integrity tag after a failure

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If a userspace process reads (with O_DIRECT) multiple blocks into the same
buffer, dm-integrity reports an error [1]. The error is reported in a log
and it may cause RAID leg being kicked out of the array.

This commit fixes dm-integrity, so that if integrity verification fails,
the data is read again into a kernel buffer (where userspace can't modify
it) and the integrity tag is rechecked. If the recheck succeeds, the
content of the kernel buffer is copied into the user buffer; if the
recheck fails, an integrity 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>

...

This commit is contained in:

Mikulas Patocka 2024-02-19 21:27:39 +01:00 • committed by Mike Snitzer

parent 54be6c6c5a

commit c88f5e553f

1 changed files with 84 additions and 9 deletions

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drivers/md/dm-integrity.c

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