From: Kees Cook <keescook@chromium.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "Kees Cook" <keescook@chromium.org>,
"João Moreira" <joao.moreira@intel.com>,
"Eric Biggers" <ebiggers@kernel.org>,
"Sami Tolvanen" <samitolvanen@google.com>,
"David S. Miller" <davem@davemloft.net>,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Stephan Mueller" <smueller@chronox.de>,
x86@kernel.org, linux-crypto@vger.kernel.org,
linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: [PATCH v5 6/8] crypto: x86/aesni: Remove glue function macro usage
Date: Wed, 13 Nov 2019 10:25:14 -0800 [thread overview]
Message-ID: <20191113182516.13545-7-keescook@chromium.org> (raw)
In-Reply-To: <20191113182516.13545-1-keescook@chromium.org>
In order to remove the callsite function casts, regularize the function
prototypes for helpers to avoid triggering Control-Flow Integrity checks
during indirect function calls. Where needed, to avoid changes to
pointer math, u8 pointers are internally cast back to u128 pointers.
Signed-off-by: Kees Cook <keescook@chromium.org>
---
arch/x86/crypto/aesni-intel_glue.c | 45 +++++++++++++-----------------
1 file changed, 19 insertions(+), 26 deletions(-)
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index 3e707e81afdb..f47afa5ae8ca 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -83,10 +83,8 @@ struct gcm_context_data {
asmlinkage int aesni_set_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
unsigned int key_len);
-asmlinkage void aesni_enc(struct crypto_aes_ctx *ctx, u8 *out,
- const u8 *in);
-asmlinkage void aesni_dec(struct crypto_aes_ctx *ctx, u8 *out,
- const u8 *in);
+asmlinkage void aesni_enc(void *ctx, u8 *out, const u8 *in);
+asmlinkage void aesni_dec(void *ctx, u8 *out, const u8 *in);
asmlinkage void aesni_ecb_enc(struct crypto_aes_ctx *ctx, u8 *out,
const u8 *in, unsigned int len);
asmlinkage void aesni_ecb_dec(struct crypto_aes_ctx *ctx, u8 *out,
@@ -107,7 +105,7 @@ asmlinkage void aesni_ctr_enc(struct crypto_aes_ctx *ctx, u8 *out,
const u8 *in, unsigned int len, u8 *iv);
asmlinkage void aesni_xts_crypt8(struct crypto_aes_ctx *ctx, u8 *out,
- const u8 *in, bool enc, u8 *iv);
+ const u8 *in, bool enc, le128 *iv);
/* asmlinkage void aesni_gcm_enc()
* void *ctx, AES Key schedule. Starts on a 16 byte boundary.
@@ -550,29 +548,26 @@ static int xts_aesni_setkey(struct crypto_skcipher *tfm, const u8 *key,
}
-static void aesni_xts_tweak(void *ctx, u8 *out, const u8 *in)
+static void aesni_xts_enc(void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
- aesni_enc(ctx, out, in);
+ glue_xts_crypt_128bit_one(ctx, (u128 *)dst, (const u128 *)src, iv,
+ aesni_enc);
}
-static void aesni_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
+static void aesni_xts_dec(void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
- glue_xts_crypt_128bit_one(ctx, dst, src, iv, GLUE_FUNC_CAST(aesni_enc));
+ glue_xts_crypt_128bit_one(ctx, (u128 *)dst, (const u128 *)src, iv,
+ aesni_dec);
}
-static void aesni_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
+static void aesni_xts_enc8(void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
- glue_xts_crypt_128bit_one(ctx, dst, src, iv, GLUE_FUNC_CAST(aesni_dec));
+ aesni_xts_crypt8(ctx, dst, src, true, iv);
}
-static void aesni_xts_enc8(void *ctx, u128 *dst, const u128 *src, le128 *iv)
+static void aesni_xts_dec8(void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
- aesni_xts_crypt8(ctx, (u8 *)dst, (const u8 *)src, true, (u8 *)iv);
-}
-
-static void aesni_xts_dec8(void *ctx, u128 *dst, const u128 *src, le128 *iv)
-{
- aesni_xts_crypt8(ctx, (u8 *)dst, (const u8 *)src, false, (u8 *)iv);
+ aesni_xts_crypt8(ctx, dst, src, false, iv);
}
static const struct common_glue_ctx aesni_enc_xts = {
@@ -581,10 +576,10 @@ static const struct common_glue_ctx aesni_enc_xts = {
.funcs = { {
.num_blocks = 8,
- .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_enc8) }
+ .fn_u = { .xts = aesni_xts_enc8 }
}, {
.num_blocks = 1,
- .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_enc) }
+ .fn_u = { .xts = aesni_xts_enc }
} }
};
@@ -594,10 +589,10 @@ static const struct common_glue_ctx aesni_dec_xts = {
.funcs = { {
.num_blocks = 8,
- .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_dec8) }
+ .fn_u = { .xts = aesni_xts_dec8 }
}, {
.num_blocks = 1,
- .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_dec) }
+ .fn_u = { .xts = aesni_xts_dec }
} }
};
@@ -606,8 +601,7 @@ static int xts_encrypt(struct skcipher_request *req)
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
- return glue_xts_req_128bit(&aesni_enc_xts, req,
- XTS_TWEAK_CAST(aesni_xts_tweak),
+ return glue_xts_req_128bit(&aesni_enc_xts, req, aesni_enc,
aes_ctx(ctx->raw_tweak_ctx),
aes_ctx(ctx->raw_crypt_ctx),
false);
@@ -618,8 +612,7 @@ static int xts_decrypt(struct skcipher_request *req)
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
- return glue_xts_req_128bit(&aesni_dec_xts, req,
- XTS_TWEAK_CAST(aesni_xts_tweak),
+ return glue_xts_req_128bit(&aesni_dec_xts, req, aesni_enc,
aes_ctx(ctx->raw_tweak_ctx),
aes_ctx(ctx->raw_crypt_ctx),
true);
--
2.17.1
next prev parent reply other threads:[~2019-11-13 18:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-13 18:25 [PATCH v5 0/8] crypto: x86: Fix indirect function call casts Kees Cook
2019-11-13 18:25 ` [PATCH v5 1/8] crypto: x86/glue_helper: Regularize function prototypes Kees Cook
2019-11-13 18:25 ` [PATCH v5 2/8] crypto: x86/serpent: Remove glue function macros usage Kees Cook
2019-11-13 19:34 ` Eric Biggers
2019-11-21 22:45 ` Kees Cook
2019-11-13 18:25 ` [PATCH v5 3/8] crypto: x86/camellia: Remove glue function macro usage Kees Cook
2019-11-13 19:39 ` Eric Biggers
2019-11-21 22:56 ` Kees Cook
2019-11-13 18:25 ` [PATCH v5 4/8] crypto: x86/twofish: " Kees Cook
2019-11-13 18:25 ` [PATCH v5 5/8] crypto: x86/cast6: " Kees Cook
2019-11-13 18:25 ` Kees Cook [this message]
2019-11-13 19:32 ` [PATCH v5 6/8] crypto: x86/aesni: " Eric Biggers
2019-11-13 18:25 ` [PATCH v5 7/8] crypto: x86/glue_helper: Remove function prototype cast helpers Kees Cook
2019-11-13 18:25 ` [PATCH v5 8/8] crypto, x86/sha: Eliminate casts on asm implementations Kees Cook
2019-11-13 19:55 ` Eric Biggers
2019-11-21 23:14 ` Kees Cook
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