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crypto: aesni - prevent misaligned buffers on the stack

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commit a13ed1d15b07a04b1f74b2df61ff7a5e47f45dd8 upstream.

The GCM mode driver uses 16 byte aligned buffers on the stack to pass
the IV to the asm helpers, but unfortunately, the x86 port does not
guarantee that the stack pointer is 16 byte aligned upon entry in the
first place. Since the compiler is not aware of this, it will not emit
the additional stack realignment sequence that is needed, and so the
alignment is not guaranteed to be more than 8 bytes.

So instead, allocate some padding on the stack, and realign the IV
pointer by hand.

Cc: <stable@vger.kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ard Biesheuvel 2021-01-04 16:55:46 +01:00 committed by Greg Kroah-Hartman
parent e2c540e181
commit 6e3b6710ea
1 changed files with 16 additions and 12 deletions
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28
arch/x86/crypto/aesni-intel_glue.c
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@ -686,7 +686,8 @@ static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req,
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
unsigned long auth_tag_len = crypto_aead_authsize(tfm);
const struct aesni_gcm_tfm_s *gcm_tfm = aesni_gcm_tfm;
struct gcm_context_data data AESNI_ALIGN_ATTR;
u8 databuf[sizeof(struct gcm_context_data) + (AESNI_ALIGN - 8)] __aligned(8);
struct gcm_context_data *data = PTR_ALIGN((void *)databuf, AESNI_ALIGN);
struct scatter_walk dst_sg_walk = {};
unsigned long left = req->cryptlen;
unsigned long len, srclen, dstlen;
@ -735,8 +736,7 @@ static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req,
}
kernel_fpu_begin();
gcm_tfm->init(aes_ctx, &data, iv,
hash_subkey, assoc, assoclen);
gcm_tfm->init(aes_ctx, data, iv, hash_subkey, assoc, assoclen);
if (req->src != req->dst) {
while (left) {
src = scatterwalk_map(&src_sg_walk);
@ -746,10 +746,10 @@ static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req,
len = min(srclen, dstlen);
if (len) {
if (enc)
gcm_tfm->enc_update(aes_ctx, &data,
gcm_tfm->enc_update(aes_ctx, data,
dst, src, len);
else
gcm_tfm->dec_update(aes_ctx, &data,
gcm_tfm->dec_update(aes_ctx, data,
dst, src, len);
}
left -= len;
@ -767,10 +767,10 @@ static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req,
len = scatterwalk_clamp(&src_sg_walk, left);
if (len) {
if (enc)
gcm_tfm->enc_update(aes_ctx, &data,
gcm_tfm->enc_update(aes_ctx, data,
src, src, len);
else
gcm_tfm->dec_update(aes_ctx, &data,
gcm_tfm->dec_update(aes_ctx, data,
src, src, len);
}
left -= len;
@ -779,7 +779,7 @@ static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req,
scatterwalk_done(&src_sg_walk, 1, left);
}
}
gcm_tfm->finalize(aes_ctx, &data, authTag, auth_tag_len);
gcm_tfm->finalize(aes_ctx, data, authTag, auth_tag_len);
kernel_fpu_end();
if (!assocmem)
@ -828,7 +828,8 @@ static int helper_rfc4106_encrypt(struct aead_request *req)
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
void *aes_ctx = &(ctx->aes_key_expanded);
u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN)));
u8 ivbuf[16 + (AESNI_ALIGN - 8)] __aligned(8);
u8 *iv = PTR_ALIGN(&ivbuf[0], AESNI_ALIGN);
unsigned int i;
__be32 counter = cpu_to_be32(1);
@ -855,7 +856,8 @@ static int helper_rfc4106_decrypt(struct aead_request *req)
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
void *aes_ctx = &(ctx->aes_key_expanded);
u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN)));
u8 ivbuf[16 + (AESNI_ALIGN - 8)] __aligned(8);
u8 *iv = PTR_ALIGN(&ivbuf[0], AESNI_ALIGN);
unsigned int i;
if (unlikely(req->assoclen != 16 && req->assoclen != 20))
@ -985,7 +987,8 @@ static int generic_gcmaes_encrypt(struct aead_request *req)
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct generic_gcmaes_ctx *ctx = generic_gcmaes_ctx_get(tfm);
void *aes_ctx = &(ctx->aes_key_expanded);
u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN)));
u8 ivbuf[16 + (AESNI_ALIGN - 8)] __aligned(8);
u8 *iv = PTR_ALIGN(&ivbuf[0], AESNI_ALIGN);
__be32 counter = cpu_to_be32(1);
memcpy(iv, req->iv, 12);
@ -1001,7 +1004,8 @@ static int generic_gcmaes_decrypt(struct aead_request *req)
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct generic_gcmaes_ctx *ctx = generic_gcmaes_ctx_get(tfm);
void *aes_ctx = &(ctx->aes_key_expanded);
u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN)));
u8 ivbuf[16 + (AESNI_ALIGN - 8)] __aligned(8);
u8 *iv = PTR_ALIGN(&ivbuf[0], AESNI_ALIGN);
memcpy(iv, req->iv, 12);
*((__be32 *)(iv+12)) = counter;