[v6,8/8] crypto, x86/sha: Eliminate casts on asm implementations
diff mbox series

Message ID 20191122010334.12081-9-keescook@chromium.org
State New
Headers show
Series
  • crypto: x86: Fix indirect function call casts
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Commit Message

Kees Cook Nov. 22, 2019, 1:03 a.m. UTC
In order to avoid CFI function prototype mismatches, this removes the
casts on assembly implementations of sha1/256/512 accelerators. The
safety checks from BUILD_BUG_ON() remain.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 arch/x86/crypto/sha1_ssse3_asm.S    | 10 +++--
 arch/x86/crypto/sha1_ssse3_glue.c   | 64 ++++++++++++-----------------
 arch/x86/crypto/sha256-ssse3-asm.S  |  4 +-
 arch/x86/crypto/sha256_ssse3_glue.c | 34 +++++++--------
 arch/x86/crypto/sha512-ssse3-asm.S  |  4 +-
 arch/x86/crypto/sha512_ssse3_glue.c | 31 +++++++-------
 6 files changed, 72 insertions(+), 75 deletions(-)

Comments

Eric Biggers Nov. 22, 2019, 3:06 a.m. UTC | #1
On Thu, Nov 21, 2019 at 05:03:34PM -0800, Kees Cook wrote:
> -asmlinkage void sha1_transform_ssse3(u32 *digest, const char *data,
> -				     unsigned int rounds);
> +asmlinkage void sha1_transform_ssse3(struct sha1_state *digest,
> +				     const u8 *data, int rounds);

Can you please use:

asmlinkage void sha1_transform_ssse3(struct sha1_state *state,
				     const u8 *data, int blocks);

I.e., rename 'digest' => 'state' and 'rounds' => 'blocks'.

(Or alternatively 'sst' instead of 'state' would be okay since that's what
sha{1,256,512}_block_fn uses, but 'state' seems much clearer to me.)

Similarly for the other sha{1,256,512}_transform_*() functions.

'digest' is confusing because it would typically be understood to mean the final
digest, or maybe also the hash chaining state (e.g. u32[5] for SHA-1) if it's
interpreted loosely.  I don't think it would typically be understand to also
include buffered data like struct sha1_state does.

'rounds' is confusing because the parameter is actually the number of blocks,
not the number of rounds -- the latter being fixed for each SHA-* algorithm.
Since sha{1,256,512}_block_fn already call it 'blocks' and this patch has to
update the type of this parameter anyway, let's use that.

>  #ifdef CONFIG_AS_AVX
> -asmlinkage void sha1_transform_avx(u32 *digest, const char *data,
> -				   unsigned int rounds);
> +asmlinkage void sha1_transform_avx(struct sha1_state *digest,
> +				   const u8 *data, int rounds);
>  

This patch is also still missing updates to the corresponding comments in the
assembly files:

	sha1_transform_avx()
	sha1_transform_avx2()
	sha256_transform_avx()
	sha256_transform_rorx()
	sha512_transform_ssse3() [references to D, M, and L remain]
	sha512_transform_avx()
	sha512_transform_rorx()

FWIW, this patch is also independent from 1-7, so it could be sent out
separately if it makes things any easier for you.

Thanks,

- Eric

Patch
diff mbox series

diff --git a/arch/x86/crypto/sha1_ssse3_asm.S b/arch/x86/crypto/sha1_ssse3_asm.S
index 99c5b8c4dc38..b6443979a60b 100644
--- a/arch/x86/crypto/sha1_ssse3_asm.S
+++ b/arch/x86/crypto/sha1_ssse3_asm.S
@@ -457,9 +457,13 @@  W_PRECALC_SSSE3
 	movdqu	\a,\b
 .endm
 
-/* SSSE3 optimized implementation:
- *  extern "C" void sha1_transform_ssse3(u32 *digest, const char *data, u32 *ws,
- *                                       unsigned int rounds);
+/*
+ * SSSE3 optimized implementation:
+ *
+ * extern "C" void sha1_transform_ssse3(struct sha1_state *digest,
+ *					const u8 *data, int rounds);
+ *
+ * Note that struct sha1_state is assumed to begin with u32 state[5].
  */
 SHA1_VECTOR_ASM     sha1_transform_ssse3
 
diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
index 639d4c2fd6a8..f2864a15a203 100644
--- a/arch/x86/crypto/sha1_ssse3_glue.c
+++ b/arch/x86/crypto/sha1_ssse3_glue.c
@@ -27,11 +27,8 @@ 
 #include <crypto/sha1_base.h>
 #include <asm/simd.h>
 
-typedef void (sha1_transform_fn)(u32 *digest, const char *data,
-				unsigned int rounds);
-
 static int sha1_update(struct shash_desc *desc, const u8 *data,
-			     unsigned int len, sha1_transform_fn *sha1_xform)
+			     unsigned int len, sha1_block_fn *sha1_xform)
 {
 	struct sha1_state *sctx = shash_desc_ctx(desc);
 
@@ -39,48 +36,47 @@  static int sha1_update(struct shash_desc *desc, const u8 *data,
 	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
 		return crypto_sha1_update(desc, data, len);
 
-	/* make sure casting to sha1_block_fn() is safe */
+	/*
+	 * Make sure struct sha1_state begins directly with the SHA1
+	 * 160-bit internal state, as this is what the asm functions expect.
+	 */
 	BUILD_BUG_ON(offsetof(struct sha1_state, state) != 0);
 
 	kernel_fpu_begin();
-	sha1_base_do_update(desc, data, len,
-			    (sha1_block_fn *)sha1_xform);
+	sha1_base_do_update(desc, data, len, sha1_xform);
 	kernel_fpu_end();
 
 	return 0;
 }
 
 static int sha1_finup(struct shash_desc *desc, const u8 *data,
-		      unsigned int len, u8 *out, sha1_transform_fn *sha1_xform)
+		      unsigned int len, u8 *out, sha1_block_fn *sha1_xform)
 {
 	if (!crypto_simd_usable())
 		return crypto_sha1_finup(desc, data, len, out);
 
 	kernel_fpu_begin();
 	if (len)
-		sha1_base_do_update(desc, data, len,
-				    (sha1_block_fn *)sha1_xform);
-	sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_xform);
+		sha1_base_do_update(desc, data, len, sha1_xform);
+	sha1_base_do_finalize(desc, sha1_xform);
 	kernel_fpu_end();
 
 	return sha1_base_finish(desc, out);
 }
 
-asmlinkage void sha1_transform_ssse3(u32 *digest, const char *data,
-				     unsigned int rounds);
+asmlinkage void sha1_transform_ssse3(struct sha1_state *digest,
+				     const u8 *data, int rounds);
 
 static int sha1_ssse3_update(struct shash_desc *desc, const u8 *data,
 			     unsigned int len)
 {
-	return sha1_update(desc, data, len,
-			(sha1_transform_fn *) sha1_transform_ssse3);
+	return sha1_update(desc, data, len, sha1_transform_ssse3);
 }
 
 static int sha1_ssse3_finup(struct shash_desc *desc, const u8 *data,
 			      unsigned int len, u8 *out)
 {
-	return sha1_finup(desc, data, len, out,
-			(sha1_transform_fn *) sha1_transform_ssse3);
+	return sha1_finup(desc, data, len, out, sha1_transform_ssse3);
 }
 
 /* Add padding and return the message digest. */
@@ -119,21 +115,19 @@  static void unregister_sha1_ssse3(void)
 }
 
 #ifdef CONFIG_AS_AVX
-asmlinkage void sha1_transform_avx(u32 *digest, const char *data,
-				   unsigned int rounds);
+asmlinkage void sha1_transform_avx(struct sha1_state *digest,
+				   const u8 *data, int rounds);
 
 static int sha1_avx_update(struct shash_desc *desc, const u8 *data,
 			     unsigned int len)
 {
-	return sha1_update(desc, data, len,
-			(sha1_transform_fn *) sha1_transform_avx);
+	return sha1_update(desc, data, len, sha1_transform_avx);
 }
 
 static int sha1_avx_finup(struct shash_desc *desc, const u8 *data,
 			      unsigned int len, u8 *out)
 {
-	return sha1_finup(desc, data, len, out,
-			(sha1_transform_fn *) sha1_transform_avx);
+	return sha1_finup(desc, data, len, out, sha1_transform_avx);
 }
 
 static int sha1_avx_final(struct shash_desc *desc, u8 *out)
@@ -190,8 +184,8 @@  static inline void unregister_sha1_avx(void) { }
 #if defined(CONFIG_AS_AVX2) && (CONFIG_AS_AVX)
 #define SHA1_AVX2_BLOCK_OPTSIZE	4	/* optimal 4*64 bytes of SHA1 blocks */
 
-asmlinkage void sha1_transform_avx2(u32 *digest, const char *data,
-				    unsigned int rounds);
+asmlinkage void sha1_transform_avx2(struct sha1_state *digest,
+				    const u8 *data, int rounds);
 
 static bool avx2_usable(void)
 {
@@ -203,8 +197,8 @@  static bool avx2_usable(void)
 	return false;
 }
 
-static void sha1_apply_transform_avx2(u32 *digest, const char *data,
-				unsigned int rounds)
+static void sha1_apply_transform_avx2(struct sha1_state *digest,
+				      const u8 *data, int rounds)
 {
 	/* Select the optimal transform based on data block size */
 	if (rounds >= SHA1_AVX2_BLOCK_OPTSIZE)
@@ -216,15 +210,13 @@  static void sha1_apply_transform_avx2(u32 *digest, const char *data,
 static int sha1_avx2_update(struct shash_desc *desc, const u8 *data,
 			     unsigned int len)
 {
-	return sha1_update(desc, data, len,
-		(sha1_transform_fn *) sha1_apply_transform_avx2);
+	return sha1_update(desc, data, len, sha1_apply_transform_avx2);
 }
 
 static int sha1_avx2_finup(struct shash_desc *desc, const u8 *data,
 			      unsigned int len, u8 *out)
 {
-	return sha1_finup(desc, data, len, out,
-		(sha1_transform_fn *) sha1_apply_transform_avx2);
+	return sha1_finup(desc, data, len, out, sha1_apply_transform_avx2);
 }
 
 static int sha1_avx2_final(struct shash_desc *desc, u8 *out)
@@ -267,21 +259,19 @@  static inline void unregister_sha1_avx2(void) { }
 #endif
 
 #ifdef CONFIG_AS_SHA1_NI
-asmlinkage void sha1_ni_transform(u32 *digest, const char *data,
-				   unsigned int rounds);
+asmlinkage void sha1_ni_transform(struct sha1_state *digest, const u8 *data,
+				  int rounds);
 
 static int sha1_ni_update(struct shash_desc *desc, const u8 *data,
 			     unsigned int len)
 {
-	return sha1_update(desc, data, len,
-		(sha1_transform_fn *) sha1_ni_transform);
+	return sha1_update(desc, data, len, sha1_ni_transform);
 }
 
 static int sha1_ni_finup(struct shash_desc *desc, const u8 *data,
 			      unsigned int len, u8 *out)
 {
-	return sha1_finup(desc, data, len, out,
-		(sha1_transform_fn *) sha1_ni_transform);
+	return sha1_finup(desc, data, len, out, sha1_ni_transform);
 }
 
 static int sha1_ni_final(struct shash_desc *desc, u8 *out)
diff --git a/arch/x86/crypto/sha256-ssse3-asm.S b/arch/x86/crypto/sha256-ssse3-asm.S
index c6c05ed2c16a..a3ea5f9b0522 100644
--- a/arch/x86/crypto/sha256-ssse3-asm.S
+++ b/arch/x86/crypto/sha256-ssse3-asm.S
@@ -347,8 +347,10 @@  a = TMP_
 .endm
 
 ########################################################################
-## void sha256_transform_ssse3(void *input_data, UINT32 digest[8], UINT64 num_blks)
+## void sha256_transform_ssse3(struct sha1_state *digest, const u8 *data,
+##			       int rounds);
 ## arg 1 : pointer to digest
+##	   (struct sha256_state is assumed to begin with u32 state[8])
 ## arg 2 : pointer to input data
 ## arg 3 : Num blocks
 ########################################################################
diff --git a/arch/x86/crypto/sha256_ssse3_glue.c b/arch/x86/crypto/sha256_ssse3_glue.c
index f9aff31fe59e..08ec76ae4de7 100644
--- a/arch/x86/crypto/sha256_ssse3_glue.c
+++ b/arch/x86/crypto/sha256_ssse3_glue.c
@@ -41,12 +41,11 @@ 
 #include <linux/string.h>
 #include <asm/simd.h>
 
-asmlinkage void sha256_transform_ssse3(u32 *digest, const char *data,
-				       u64 rounds);
-typedef void (sha256_transform_fn)(u32 *digest, const char *data, u64 rounds);
+asmlinkage void sha256_transform_ssse3(struct sha256_state *digest,
+				       const u8 *data, int rounds);
 
 static int _sha256_update(struct shash_desc *desc, const u8 *data,
-			  unsigned int len, sha256_transform_fn *sha256_xform)
+			  unsigned int len, sha256_block_fn *sha256_xform)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);
 
@@ -54,28 +53,29 @@  static int _sha256_update(struct shash_desc *desc, const u8 *data,
 	    (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
 		return crypto_sha256_update(desc, data, len);
 
-	/* make sure casting to sha256_block_fn() is safe */
+	/*
+	 * Make sure struct sha256_state begins directly with the SHA256
+	 * 256-bit internal state, as this is what the asm functions expect.
+	 */
 	BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
 
 	kernel_fpu_begin();
-	sha256_base_do_update(desc, data, len,
-			      (sha256_block_fn *)sha256_xform);
+	sha256_base_do_update(desc, data, len, sha256_xform);
 	kernel_fpu_end();
 
 	return 0;
 }
 
 static int sha256_finup(struct shash_desc *desc, const u8 *data,
-	      unsigned int len, u8 *out, sha256_transform_fn *sha256_xform)
+	      unsigned int len, u8 *out, sha256_block_fn *sha256_xform)
 {
 	if (!crypto_simd_usable())
 		return crypto_sha256_finup(desc, data, len, out);
 
 	kernel_fpu_begin();
 	if (len)
-		sha256_base_do_update(desc, data, len,
-				      (sha256_block_fn *)sha256_xform);
-	sha256_base_do_finalize(desc, (sha256_block_fn *)sha256_xform);
+		sha256_base_do_update(desc, data, len, sha256_xform);
+	sha256_base_do_finalize(desc, sha256_xform);
 	kernel_fpu_end();
 
 	return sha256_base_finish(desc, out);
@@ -145,8 +145,8 @@  static void unregister_sha256_ssse3(void)
 }
 
 #ifdef CONFIG_AS_AVX
-asmlinkage void sha256_transform_avx(u32 *digest, const char *data,
-				     u64 rounds);
+asmlinkage void sha256_transform_avx(struct sha256_state *digest,
+				     const u8 *data, int blocks);
 
 static int sha256_avx_update(struct shash_desc *desc, const u8 *data,
 			 unsigned int len)
@@ -227,8 +227,8 @@  static inline void unregister_sha256_avx(void) { }
 #endif
 
 #if defined(CONFIG_AS_AVX2) && defined(CONFIG_AS_AVX)
-asmlinkage void sha256_transform_rorx(u32 *digest, const char *data,
-				      u64 rounds);
+asmlinkage void sha256_transform_rorx(struct sha256_state *digest,
+				      const u8 *data, int rounds);
 
 static int sha256_avx2_update(struct shash_desc *desc, const u8 *data,
 			 unsigned int len)
@@ -307,8 +307,8 @@  static inline void unregister_sha256_avx2(void) { }
 #endif
 
 #ifdef CONFIG_AS_SHA256_NI
-asmlinkage void sha256_ni_transform(u32 *digest, const char *data,
-				   u64 rounds); /*unsigned int rounds);*/
+asmlinkage void sha256_ni_transform(struct sha256_state *digest,
+				    const u8 *data, int rounds);
 
 static int sha256_ni_update(struct shash_desc *desc, const u8 *data,
 			 unsigned int len)
diff --git a/arch/x86/crypto/sha512-ssse3-asm.S b/arch/x86/crypto/sha512-ssse3-asm.S
index 66bbd9058a90..840c749051ee 100644
--- a/arch/x86/crypto/sha512-ssse3-asm.S
+++ b/arch/x86/crypto/sha512-ssse3-asm.S
@@ -269,7 +269,9 @@  frame_size = frame_GPRSAVE + GPRSAVE_SIZE
 .endm
 
 ########################################################################
-# void sha512_transform_ssse3(void* D, const void* M, u64 L)#
+## void sha512_transform_ssse3(struct sha1_state *digest, const u8 *data,
+##			       int rounds);
+# (struct sha512_state is assumed to begin with u64 state[8])
 # Purpose: Updates the SHA512 digest stored at D with the message stored in M.
 # The size of the message pointed to by M must be an integer multiple of SHA512
 #   message blocks.
diff --git a/arch/x86/crypto/sha512_ssse3_glue.c b/arch/x86/crypto/sha512_ssse3_glue.c
index 458356a3f124..19c9596534aa 100644
--- a/arch/x86/crypto/sha512_ssse3_glue.c
+++ b/arch/x86/crypto/sha512_ssse3_glue.c
@@ -39,13 +39,11 @@ 
 #include <crypto/sha512_base.h>
 #include <asm/simd.h>
 
-asmlinkage void sha512_transform_ssse3(u64 *digest, const char *data,
-				       u64 rounds);
-
-typedef void (sha512_transform_fn)(u64 *digest, const char *data, u64 rounds);
+asmlinkage void sha512_transform_ssse3(struct sha512_state *digest,
+				       const u8 *data, int rounds);
 
 static int sha512_update(struct shash_desc *desc, const u8 *data,
-		       unsigned int len, sha512_transform_fn *sha512_xform)
+		       unsigned int len, sha512_block_fn *sha512_xform)
 {
 	struct sha512_state *sctx = shash_desc_ctx(desc);
 
@@ -53,28 +51,29 @@  static int sha512_update(struct shash_desc *desc, const u8 *data,
 	    (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
 		return crypto_sha512_update(desc, data, len);
 
-	/* make sure casting to sha512_block_fn() is safe */
+	/*
+	 * Make sure struct sha512_state begins directly with the SHA512
+	 * 512-bit internal state, as this is what the asm functions expect.
+	 */
 	BUILD_BUG_ON(offsetof(struct sha512_state, state) != 0);
 
 	kernel_fpu_begin();
-	sha512_base_do_update(desc, data, len,
-			      (sha512_block_fn *)sha512_xform);
+	sha512_base_do_update(desc, data, len, sha512_xform);
 	kernel_fpu_end();
 
 	return 0;
 }
 
 static int sha512_finup(struct shash_desc *desc, const u8 *data,
-	      unsigned int len, u8 *out, sha512_transform_fn *sha512_xform)
+	      unsigned int len, u8 *out, sha512_block_fn *sha512_xform)
 {
 	if (!crypto_simd_usable())
 		return crypto_sha512_finup(desc, data, len, out);
 
 	kernel_fpu_begin();
 	if (len)
-		sha512_base_do_update(desc, data, len,
-				      (sha512_block_fn *)sha512_xform);
-	sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_xform);
+		sha512_base_do_update(desc, data, len, sha512_xform);
+	sha512_base_do_finalize(desc, sha512_xform);
 	kernel_fpu_end();
 
 	return sha512_base_finish(desc, out);
@@ -144,8 +143,8 @@  static void unregister_sha512_ssse3(void)
 }
 
 #ifdef CONFIG_AS_AVX
-asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
-				     u64 rounds);
+asmlinkage void sha512_transform_avx(struct sha512_state *digest,
+				     const u8 *data, int rounds);
 static bool avx_usable(void)
 {
 	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
@@ -225,8 +224,8 @@  static inline void unregister_sha512_avx(void) { }
 #endif
 
 #if defined(CONFIG_AS_AVX2) && defined(CONFIG_AS_AVX)
-asmlinkage void sha512_transform_rorx(u64 *digest, const char *data,
-				      u64 rounds);
+asmlinkage void sha512_transform_rorx(struct sha512_state *digest,
+				      const u8 *data, int rounds);
 
 static int sha512_avx2_update(struct shash_desc *desc, const u8 *data,
 		       unsigned int len)