From: Daniel Axtens Date: Wed, 8 Jan 2020 05:06:46 +0000 (+1100) Subject: crypto: vmx - reject xts inputs that are too short X-Git-Tag: v5.6-rc1~152^2~42 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=1372a51b88fa0d5a8ed2803e4975c98da3f08463;p=linux.git crypto: vmx - reject xts inputs that are too short When the kernel XTS implementation was extended to deal with ciphertext stealing in commit 8083b1bf8163 ("crypto: xts - add support for ciphertext stealing"), a check was added to reject inputs that were too short. However, in the vmx enablement - commit 239668419349 ("crypto: vmx/xts - use fallback for ciphertext stealing"), that check wasn't added to the vmx implementation. This disparity leads to errors like the following: alg: skcipher: p8_aes_xts encryption unexpectedly succeeded on test vector "random: len=0 klen=64"; expected_error=-22, cfg="random: inplace may_sleep use_finup src_divs=[66.99%@+10, 33.1%@alignmask+1155]" Return -EINVAL if asked to operate with a cryptlen smaller than the AES block size. This brings vmx in line with the generic implementation. Reported-by: Erhard Furtner Link: https://bugzilla.kernel.org/show_bug.cgi?id=206049 Fixes: 239668419349 ("crypto: vmx/xts - use fallback for ciphertext stealing") Cc: Ard Biesheuvel Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Michael Ellerman [dja: commit message] Signed-off-by: Daniel Axtens Signed-off-by: Herbert Xu --- diff --git a/drivers/crypto/vmx/aes_xts.c b/drivers/crypto/vmx/aes_xts.c index d59e736882f6..9fee1b1532a4 100644 --- a/drivers/crypto/vmx/aes_xts.c +++ b/drivers/crypto/vmx/aes_xts.c @@ -84,6 +84,9 @@ static int p8_aes_xts_crypt(struct skcipher_request *req, int enc) u8 tweak[AES_BLOCK_SIZE]; int ret; + if (req->cryptlen < AES_BLOCK_SIZE) + return -EINVAL; + if (!crypto_simd_usable() || (req->cryptlen % XTS_BLOCK_SIZE) != 0) { struct skcipher_request *subreq = skcipher_request_ctx(req);