From: Eric Biggers ebiggers@google.com

The x86 AEGIS implementations all fail the improved AEAD tests because they produce the wrong result with some data layouts. Also, when the MAY_SLEEP flag is given, they can sleep in the skcipher_walk_*() functions while preemption is disabled by kernel_fpu_begin().

Fix these bugs.

Fixes: 1d373d4e8e15 ("crypto: x86 - Add optimized AEGIS implementations") Cc: stable@vger.kernel.org # v4.18+ Cc: Ondrej Mosnacek omosnace@redhat.com Signed-off-by: Eric Biggers ebiggers@google.com --- arch/x86/crypto/aegis128-aesni-glue.c | 38 ++++++++++---------------- arch/x86/crypto/aegis128l-aesni-glue.c | 38 ++++++++++---------------- arch/x86/crypto/aegis256-aesni-glue.c | 38 ++++++++++---------------- 3 files changed, 45 insertions(+), 69 deletions(-)

diff --git a/arch/x86/crypto/aegis128-aesni-glue.c b/arch/x86/crypto/aegis128-aesni-glue.c index 2a356b948720..3ea71b871813 100644 --- a/arch/x86/crypto/aegis128-aesni-glue.c +++ b/arch/x86/crypto/aegis128-aesni-glue.c @@ -119,31 +119,20 @@ static void crypto_aegis128_aesni_process_ad( }

static void crypto_aegis128_aesni_process_crypt( - struct aegis_state *state, struct aead_request *req, + struct aegis_state *state, struct skcipher_walk *walk, const struct aegis_crypt_ops *ops) { - struct skcipher_walk walk; - u8 *src, *dst; - unsigned int chunksize, base; - - ops->skcipher_walk_init(&walk, req, false); - - while (walk.nbytes) { - src = walk.src.virt.addr; - dst = walk.dst.virt.addr; - chunksize = walk.nbytes; - - ops->crypt_blocks(state, chunksize, src, dst); - - base = chunksize & ~(AEGIS128_BLOCK_SIZE - 1); - src += base; - dst += base; - chunksize &= AEGIS128_BLOCK_SIZE - 1; - - if (chunksize > 0) - ops->crypt_tail(state, chunksize, src, dst); + while (walk->nbytes >= AEGIS128_BLOCK_SIZE) { + ops->crypt_blocks(state, + round_down(walk->nbytes, AEGIS128_BLOCK_SIZE), + walk->src.virt.addr, walk->dst.virt.addr); + skcipher_walk_done(walk, walk->nbytes % AEGIS128_BLOCK_SIZE); + }

- skcipher_walk_done(&walk, 0); + if (walk->nbytes) { + ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr, + walk->dst.virt.addr); + skcipher_walk_done(walk, 0); } }

@@ -186,13 +175,16 @@ static void crypto_aegis128_aesni_crypt(struct aead_request *req, { struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(tfm); + struct skcipher_walk walk; struct aegis_state state;

+ ops->skcipher_walk_init(&walk, req, true); + kernel_fpu_begin();

crypto_aegis128_aesni_init(&state, ctx->key.bytes, req->iv); crypto_aegis128_aesni_process_ad(&state, req->src, req->assoclen); - crypto_aegis128_aesni_process_crypt(&state, req, ops); + crypto_aegis128_aesni_process_crypt(&state, &walk, ops); crypto_aegis128_aesni_final(&state, tag_xor, req->assoclen, cryptlen);

kernel_fpu_end(); diff --git a/arch/x86/crypto/aegis128l-aesni-glue.c b/arch/x86/crypto/aegis128l-aesni-glue.c index dbe8bb980da1..1b1b39c66c5e 100644 --- a/arch/x86/crypto/aegis128l-aesni-glue.c +++ b/arch/x86/crypto/aegis128l-aesni-glue.c @@ -119,31 +119,20 @@ static void crypto_aegis128l_aesni_process_ad( }

static void crypto_aegis128l_aesni_process_crypt( - struct aegis_state *state, struct aead_request *req, + struct aegis_state *state, struct skcipher_walk *walk, const struct aegis_crypt_ops *ops) { - struct skcipher_walk walk; - u8 *src, *dst; - unsigned int chunksize, base; - - ops->skcipher_walk_init(&walk, req, false); - - while (walk.nbytes) { - src = walk.src.virt.addr; - dst = walk.dst.virt.addr; - chunksize = walk.nbytes; - - ops->crypt_blocks(state, chunksize, src, dst); - - base = chunksize & ~(AEGIS128L_BLOCK_SIZE - 1); - src += base; - dst += base; - chunksize &= AEGIS128L_BLOCK_SIZE - 1; - - if (chunksize > 0) - ops->crypt_tail(state, chunksize, src, dst); + while (walk->nbytes >= AEGIS128L_BLOCK_SIZE) { + ops->crypt_blocks(state, round_down(walk->nbytes, + AEGIS128L_BLOCK_SIZE), + walk->src.virt.addr, walk->dst.virt.addr); + skcipher_walk_done(walk, walk->nbytes % AEGIS128L_BLOCK_SIZE); + }

- skcipher_walk_done(&walk, 0); + if (walk->nbytes) { + ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr, + walk->dst.virt.addr); + skcipher_walk_done(walk, 0); } }

@@ -186,13 +175,16 @@ static void crypto_aegis128l_aesni_crypt(struct aead_request *req, { struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct aegis_ctx *ctx = crypto_aegis128l_aesni_ctx(tfm); + struct skcipher_walk walk; struct aegis_state state;

+ ops->skcipher_walk_init(&walk, req, true); + kernel_fpu_begin();

crypto_aegis128l_aesni_init(&state, ctx->key.bytes, req->iv); crypto_aegis128l_aesni_process_ad(&state, req->src, req->assoclen); - crypto_aegis128l_aesni_process_crypt(&state, req, ops); + crypto_aegis128l_aesni_process_crypt(&state, &walk, ops); crypto_aegis128l_aesni_final(&state, tag_xor, req->assoclen, cryptlen);

kernel_fpu_end(); diff --git a/arch/x86/crypto/aegis256-aesni-glue.c b/arch/x86/crypto/aegis256-aesni-glue.c index 8bebda2de92f..6227ca3220a0 100644 --- a/arch/x86/crypto/aegis256-aesni-glue.c +++ b/arch/x86/crypto/aegis256-aesni-glue.c @@ -119,31 +119,20 @@ static void crypto_aegis256_aesni_process_ad( }

static void crypto_aegis256_aesni_process_crypt( - struct aegis_state *state, struct aead_request *req, + struct aegis_state *state, struct skcipher_walk *walk, const struct aegis_crypt_ops *ops) { - struct skcipher_walk walk; - u8 *src, *dst; - unsigned int chunksize, base; - - ops->skcipher_walk_init(&walk, req, false); - - while (walk.nbytes) { - src = walk.src.virt.addr; - dst = walk.dst.virt.addr; - chunksize = walk.nbytes; - - ops->crypt_blocks(state, chunksize, src, dst); - - base = chunksize & ~(AEGIS256_BLOCK_SIZE - 1); - src += base; - dst += base; - chunksize &= AEGIS256_BLOCK_SIZE - 1; - - if (chunksize > 0) - ops->crypt_tail(state, chunksize, src, dst); + while (walk->nbytes >= AEGIS256_BLOCK_SIZE) { + ops->crypt_blocks(state, + round_down(walk->nbytes, AEGIS256_BLOCK_SIZE), + walk->src.virt.addr, walk->dst.virt.addr); + skcipher_walk_done(walk, walk->nbytes % AEGIS256_BLOCK_SIZE); + }

- skcipher_walk_done(&walk, 0); + if (walk->nbytes) { + ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr, + walk->dst.virt.addr); + skcipher_walk_done(walk, 0); } }

@@ -186,13 +175,16 @@ static void crypto_aegis256_aesni_crypt(struct aead_request *req, { struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct aegis_ctx *ctx = crypto_aegis256_aesni_ctx(tfm); + struct skcipher_walk walk; struct aegis_state state;

+ ops->skcipher_walk_init(&walk, req, true); + kernel_fpu_begin();

crypto_aegis256_aesni_init(&state, ctx->key, req->iv); crypto_aegis256_aesni_process_ad(&state, req->src, req->assoclen); - crypto_aegis256_aesni_process_crypt(&state, req, ops); + crypto_aegis256_aesni_process_crypt(&state, &walk, ops); crypto_aegis256_aesni_final(&state, tag_xor, req->assoclen, cryptlen);

kernel_fpu_end();