Re: [PATCH] crypto: xts,lrw - fix out-of-bounds write after kmalloc failure
On Thu, Mar 23, 2017 at 01:39:46PM -0700, Eric Biggers wrote: > From: Eric Biggers > > In the generic XTS and LRW algorithms, for input data > 128 bytes, a > temporary buffer is allocated to hold the values to be XOR'ed with the > data before and after encryption or decryption. If the allocation > fails, the fixed-size buffer embedded in the request buffer is meant to > be used as a fallback --- resulting in more calls to the ECB algorithm, > but still producing the correct result. However, we weren't correctly > limiting subreq->cryptlen in this case, resulting in pre_crypt() > overrunning the embedded buffer. Fix this by setting subreq->cryptlen > correctly. > > Fixes: f1c131b45410 ("crypto: xts - Convert to skcipher") > Fixes: 700cb3f5fe75 ("crypto: lrw - Convert to skcipher") > Cc: sta...@vger.kernel.org # v4.10+ > Reported-by: Dmitry Vyukov > Signed-off-by: Eric Biggers Patch applied. Thanks. -- Email: Herbert Xu Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
Re: [PATCH] crypto: xts,lrw - fix out-of-bounds write after kmalloc failure
From: Eric Biggers Date: Thu, 23 Mar 2017 13:39:46 -0700 > From: Eric Biggers > > In the generic XTS and LRW algorithms, for input data > 128 bytes, a > temporary buffer is allocated to hold the values to be XOR'ed with the > data before and after encryption or decryption. If the allocation > fails, the fixed-size buffer embedded in the request buffer is meant to > be used as a fallback --- resulting in more calls to the ECB algorithm, > but still producing the correct result. However, we weren't correctly > limiting subreq->cryptlen in this case, resulting in pre_crypt() > overrunning the embedded buffer. Fix this by setting subreq->cryptlen > correctly. > > Fixes: f1c131b45410 ("crypto: xts - Convert to skcipher") > Fixes: 700cb3f5fe75 ("crypto: lrw - Convert to skcipher") > Cc: sta...@vger.kernel.org # v4.10+ > Reported-by: Dmitry Vyukov > Signed-off-by: Eric Biggers Acked-by: David S. Miller
[PATCH] crypto: xts,lrw - fix out-of-bounds write after kmalloc failure
From: Eric Biggers In the generic XTS and LRW algorithms, for input data > 128 bytes, a temporary buffer is allocated to hold the values to be XOR'ed with the data before and after encryption or decryption. If the allocation fails, the fixed-size buffer embedded in the request buffer is meant to be used as a fallback --- resulting in more calls to the ECB algorithm, but still producing the correct result. However, we weren't correctly limiting subreq->cryptlen in this case, resulting in pre_crypt() overrunning the embedded buffer. Fix this by setting subreq->cryptlen correctly. Fixes: f1c131b45410 ("crypto: xts - Convert to skcipher") Fixes: 700cb3f5fe75 ("crypto: lrw - Convert to skcipher") Cc: sta...@vger.kernel.org # v4.10+ Reported-by: Dmitry Vyukov Signed-off-by: Eric Biggers --- crypto/lrw.c | 7 +-- crypto/xts.c | 7 +-- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/crypto/lrw.c b/crypto/lrw.c index ecd8474018e3..3ea095adafd9 100644 --- a/crypto/lrw.c +++ b/crypto/lrw.c @@ -286,8 +286,11 @@ static int init_crypt(struct skcipher_request *req, crypto_completion_t done) subreq->cryptlen = LRW_BUFFER_SIZE; if (req->cryptlen > LRW_BUFFER_SIZE) { - subreq->cryptlen = min(req->cryptlen, (unsigned)PAGE_SIZE); - rctx->ext = kmalloc(subreq->cryptlen, gfp); + unsigned int n = min(req->cryptlen, (unsigned int)PAGE_SIZE); + + rctx->ext = kmalloc(n, gfp); + if (rctx->ext) + subreq->cryptlen = n; } rctx->src = req->src; diff --git a/crypto/xts.c b/crypto/xts.c index baeb34dd8582..c976bfac29da 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -230,8 +230,11 @@ static int init_crypt(struct skcipher_request *req, crypto_completion_t done) subreq->cryptlen = XTS_BUFFER_SIZE; if (req->cryptlen > XTS_BUFFER_SIZE) { - subreq->cryptlen = min(req->cryptlen, (unsigned)PAGE_SIZE); - rctx->ext = kmalloc(subreq->cryptlen, gfp); + unsigned int n = min(req->cryptlen, (unsigned int)PAGE_SIZE); + + rctx->ext = kmalloc(n, gfp); + if (rctx->ext) + subreq->cryptlen = n; } rctx->src = req->src; -- 2.12.1.500.gab5fba24ee-goog