4.19-stable review patch. If anyone has any objections, please let me know.
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From: Mikulas Patocka mpatocka@redhat.com
commit 50c70240097ce41fe6bce6478b80478281e4d0f7 upstream.
It was said that authenticated encryption could produce invalid tag when the data that is being encrypted is modified [1]. So, fix this problem by copying the data into the clone bio first and then encrypt them inside the clone bio.
This may reduce performance, but it is needed to prevent the user from corrupting the device by writing data with O_DIRECT and modifying them at the same time.
[1] https://lore.kernel.org/all/20240207004723.GA35324@sol.localdomain/T/
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 --- drivers/md/dm-crypt.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1734,6 +1734,12 @@ static void kcryptd_crypt_write_convert( io->ctx.bio_out = clone; io->ctx.iter_out = clone->bi_iter;
+ if (crypt_integrity_aead(cc)) { + bio_copy_data(clone, io->base_bio); + io->ctx.bio_in = clone; + io->ctx.iter_in = clone->bi_iter; + } + sector += bio_sectors(clone);
crypt_inc_pending(io);