From 9f6035af06b526e678808d492fc0830aef6cfbd8 Mon Sep 17 00:00:00 2001 From: Nathan Huckleberry Date: Tue, 18 Oct 2022 16:04:12 -0700 Subject: crypto: x86/polyval - Fix crashes when keys are not 16-byte aligned crypto_tfm::__crt_ctx is not guaranteed to be 16-byte aligned on x86-64. This causes crashes due to movaps instructions in clmul_polyval_update. Add logic to align polyval_tfm_ctx to 16 bytes. Cc: Fixes: 34f7f6c30112 ("crypto: x86/polyval - Add PCLMULQDQ accelerated implementation of POLYVAL") Reported-by: Bruno Goncalves Signed-off-by: Nathan Huckleberry Reviewed-by: Eric Biggers Signed-off-by: Herbert Xu --- arch/x86/crypto/polyval-clmulni_glue.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'arch/x86/crypto/polyval-clmulni_glue.c') diff --git a/arch/x86/crypto/polyval-clmulni_glue.c b/arch/x86/crypto/polyval-clmulni_glue.c index b7664d018851..8fa58b0f3cb3 100644 --- a/arch/x86/crypto/polyval-clmulni_glue.c +++ b/arch/x86/crypto/polyval-clmulni_glue.c @@ -27,13 +27,17 @@ #include #include +#define POLYVAL_ALIGN 16 +#define POLYVAL_ALIGN_ATTR __aligned(POLYVAL_ALIGN) +#define POLYVAL_ALIGN_EXTRA ((POLYVAL_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1)) +#define POLYVAL_CTX_SIZE (sizeof(struct polyval_tfm_ctx) + POLYVAL_ALIGN_EXTRA) #define NUM_KEY_POWERS 8 struct polyval_tfm_ctx { /* * These powers must be in the order h^8, ..., h^1. */ - u8 key_powers[NUM_KEY_POWERS][POLYVAL_BLOCK_SIZE]; + u8 key_powers[NUM_KEY_POWERS][POLYVAL_BLOCK_SIZE] POLYVAL_ALIGN_ATTR; }; struct polyval_desc_ctx { @@ -45,6 +49,11 @@ asmlinkage void clmul_polyval_update(const struct polyval_tfm_ctx *keys, const u8 *in, size_t nblocks, u8 *accumulator); asmlinkage void clmul_polyval_mul(u8 *op1, const u8 *op2); +static inline struct polyval_tfm_ctx *polyval_tfm_ctx(struct crypto_shash *tfm) +{ + return PTR_ALIGN(crypto_shash_ctx(tfm), POLYVAL_ALIGN); +} + static void internal_polyval_update(const struct polyval_tfm_ctx *keys, const u8 *in, size_t nblocks, u8 *accumulator) { @@ -72,7 +81,7 @@ static void internal_polyval_mul(u8 *op1, const u8 *op2) static int polyval_x86_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { - struct polyval_tfm_ctx *tctx = crypto_shash_ctx(tfm); + struct polyval_tfm_ctx *tctx = polyval_tfm_ctx(tfm); int i; if (keylen != POLYVAL_BLOCK_SIZE) @@ -102,7 +111,7 @@ static int polyval_x86_update(struct shash_desc *desc, const u8 *src, unsigned int srclen) { struct polyval_desc_ctx *dctx = shash_desc_ctx(desc); - const struct polyval_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); + const struct polyval_tfm_ctx *tctx = polyval_tfm_ctx(desc->tfm); u8 *pos; unsigned int nblocks; unsigned int n; @@ -143,7 +152,7 @@ static int polyval_x86_update(struct shash_desc *desc, static int polyval_x86_final(struct shash_desc *desc, u8 *dst) { struct polyval_desc_ctx *dctx = shash_desc_ctx(desc); - const struct polyval_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); + const struct polyval_tfm_ctx *tctx = polyval_tfm_ctx(desc->tfm); if (dctx->bytes) { internal_polyval_mul(dctx->buffer, @@ -167,7 +176,7 @@ static struct shash_alg polyval_alg = { .cra_driver_name = "polyval-clmulni", .cra_priority = 200, .cra_blocksize = POLYVAL_BLOCK_SIZE, - .cra_ctxsize = sizeof(struct polyval_tfm_ctx), + .cra_ctxsize = POLYVAL_CTX_SIZE, .cra_module = THIS_MODULE, }, }; -- cgit v1.2.3