From 1a20b96612656b3ff2d6967c3111bec0e21904a8 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Thu, 2 Feb 2017 11:38:56 +0000 Subject: [PATCH] crypto: arm/aes - don't use IV buffer to return final keystream block The ARM bit sliced AES core code uses the IV buffer to pass the final keystream block back to the glue code if the input is not a multiple of the block size, so that the asm code does not have to deal with anything except 16 byte blocks. This is done under the assumption that the outgoing IV is meaningless anyway in this case, given that chaining is no longer possible under these circumstances. However, as it turns out, the CCM driver does expect the IV to retain a value that is equal to the original IV except for the counter value, and even interprets byte zero as a length indicator, which may result in memory corruption if the IV is overwritten with something else. So use a separate buffer to return the final keystream block. Signed-off-by: Ard Biesheuvel Signed-off-by: Herbert Xu --- arch/arm/crypto/aes-neonbs-core.S | 16 +++++++++------- arch/arm/crypto/aes-neonbs-glue.c | 9 +++++---- 2 files changed, 14 insertions(+), 11 deletions(-) diff --git a/arch/arm/crypto/aes-neonbs-core.S b/arch/arm/crypto/aes-neonbs-core.S index 12da247..2b625c6 100644 --- a/arch/arm/crypto/aes-neonbs-core.S +++ b/arch/arm/crypto/aes-neonbs-core.S @@ -779,14 +779,15 @@ ENDPROC(aesbs_cbc_decrypt) /* * aesbs_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], - * int rounds, int blocks, u8 ctr[], bool final) + * int rounds, int blocks, u8 ctr[], u8 final[]) */ ENTRY(aesbs_ctr_encrypt) mov ip, sp push {r4-r10, lr} ldm ip, {r5-r7} // load args 4-6 - add r5, r5, r7 // one extra block if final == 1 + teq r7, #0 + addne r5, r5, #1 // one extra block if final != 0 vld1.8 {q0}, [r6] // load counter vrev32.8 q1, q0 @@ -865,19 +866,20 @@ ENTRY(aesbs_ctr_encrypt) veor q2, q2, q14 vst1.8 {q2}, [r0]! teq r4, #0 // skip last block if 'final' - W(bne) 4f + W(bne) 5f 3: veor q5, q5, q15 vst1.8 {q5}, [r0]! - next_ctr q0 +4: next_ctr q0 subs r5, r5, #8 bgt 99b - vmov q5, q0 - -4: vst1.8 {q5}, [r6] + vst1.8 {q0}, [r6] pop {r4-r10, pc} + +5: vst1.8 {q5}, [r4] + b 4b ENDPROC(aesbs_ctr_encrypt) .macro next_tweak, out, in, const, tmp diff --git a/arch/arm/crypto/aes-neonbs-glue.c b/arch/arm/crypto/aes-neonbs-glue.c index e262f99..2920b96 100644 --- a/arch/arm/crypto/aes-neonbs-glue.c +++ b/arch/arm/crypto/aes-neonbs-glue.c @@ -35,7 +35,7 @@ asmlinkage void aesbs_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, int blocks, u8 iv[]); asmlinkage void aesbs_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], - int rounds, int blocks, u8 ctr[], bool final); + int rounds, int blocks, u8 ctr[], u8 final[]); asmlinkage void aesbs_xts_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, int blocks, u8 iv[]); @@ -186,6 +186,7 @@ static int ctr_encrypt(struct skcipher_request *req) struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm); struct skcipher_walk walk; + u8 buf[AES_BLOCK_SIZE]; int err; err = skcipher_walk_virt(&walk, req, true); @@ -193,12 +194,12 @@ static int ctr_encrypt(struct skcipher_request *req) kernel_neon_begin(); while (walk.nbytes > 0) { unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; - bool final = (walk.total % AES_BLOCK_SIZE) != 0; + u8 *final = (walk.total % AES_BLOCK_SIZE) ? buf : NULL; if (walk.nbytes < walk.total) { blocks = round_down(blocks, walk.stride / AES_BLOCK_SIZE); - final = false; + final = NULL; } aesbs_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr, @@ -210,7 +211,7 @@ static int ctr_encrypt(struct skcipher_request *req) if (dst != src) memcpy(dst, src, walk.total % AES_BLOCK_SIZE); - crypto_xor(dst, walk.iv, walk.total % AES_BLOCK_SIZE); + crypto_xor(dst, final, walk.total % AES_BLOCK_SIZE); err = skcipher_walk_done(&walk, 0); break; -- 2.7.4