This is a note to let you know that I've just added the patch titled dm crypt: fix benbi IV constructor crash if used in authenticated mode to the 5.5-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: dm-crypt-fix-benbi-iv-constructor-crash-if-used-in-authenticated-mode.patch and it can be found in the queue-5.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 4ea9471fbd1addb25a4d269991dc724e200ca5b5 Mon Sep 17 00:00:00 2001 From: Milan Broz <gmazyland@xxxxxxxxx> Date: Mon, 6 Jan 2020 10:11:47 +0100 Subject: dm crypt: fix benbi IV constructor crash if used in authenticated mode From: Milan Broz <gmazyland@xxxxxxxxx> commit 4ea9471fbd1addb25a4d269991dc724e200ca5b5 upstream. If benbi IV is used in AEAD construction, for example: cryptsetup luksFormat <device> --cipher twofish-xts-benbi --key-size 512 --integrity=hmac-sha256 the constructor uses wrong skcipher function and crashes: BUG: kernel NULL pointer dereference, address: 00000014 ... EIP: crypt_iv_benbi_ctr+0x15/0x70 [dm_crypt] Call Trace: ? crypt_subkey_size+0x20/0x20 [dm_crypt] crypt_ctr+0x567/0xfc0 [dm_crypt] dm_table_add_target+0x15f/0x340 [dm_mod] Fix this by properly using crypt_aead_blocksize() in this case. Fixes: ef43aa38063a6 ("dm crypt: add cryptographic data integrity protection (authenticated encryption)") Cc: stable@xxxxxxxxxxxxxxx # v4.12+ Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=941051 Reported-by: Jerad Simpson <jbsimpson@xxxxxxxxx> Signed-off-by: Milan Broz <gmazyland@xxxxxxxxx> Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/md/dm-crypt.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -331,8 +331,14 @@ static int crypt_iv_essiv_gen(struct cry static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, const char *opts) { - unsigned bs = crypto_skcipher_blocksize(any_tfm(cc)); - int log = ilog2(bs); + unsigned bs; + int log; + + if (test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags)) + bs = crypto_aead_blocksize(any_tfm_aead(cc)); + else + bs = crypto_skcipher_blocksize(any_tfm(cc)); + log = ilog2(bs); /* we need to calculate how far we must shift the sector count * to get the cipher block count, we use this shift in _gen */ Patches currently in stable-queue which might be from gmazyland@xxxxxxxxx are queue-5.5/dm-crypt-fix-benbi-iv-constructor-crash-if-used-in-authenticated-mode.patch