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Date: Wed, 13 Nov 2019 10:27:20 -0800
From: Kees Cook <keescook@...omium.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Eric Biggers <ebiggers@...gle.com>,
linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: arm64/sha: fix function types
On Tue, Nov 12, 2019 at 02:30:46PM -0800, Sami Tolvanen wrote:
> Declare assembly functions with the expected function type
> instead of casting pointers in C to avoid type mismatch failures
> with Control-Flow Integrity (CFI) checking.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
Looks good, yes. This looks very similar to what I needed to do for
x86's SHA routines.
Reviewed-by: Kees Cook <keescook@...omium.org>
> ---
> arch/arm64/crypto/sha1-ce-glue.c | 12 +++++-------
> arch/arm64/crypto/sha2-ce-glue.c | 26 +++++++++++---------------
> arch/arm64/crypto/sha256-glue.c | 30 ++++++++++++------------------
> arch/arm64/crypto/sha512-ce-glue.c | 23 ++++++++++-------------
> arch/arm64/crypto/sha512-glue.c | 13 +++++--------
> 5 files changed, 43 insertions(+), 61 deletions(-)
>
> diff --git a/arch/arm64/crypto/sha1-ce-glue.c b/arch/arm64/crypto/sha1-ce-glue.c
> index bdc1b6d7aff7..3153a9bbb683 100644
> --- a/arch/arm64/crypto/sha1-ce-glue.c
> +++ b/arch/arm64/crypto/sha1-ce-glue.c
> @@ -25,7 +25,7 @@ struct sha1_ce_state {
> u32 finalize;
> };
>
> -asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
> +asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
> int blocks);
>
> const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
> @@ -41,8 +41,7 @@ static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
>
> sctx->finalize = 0;
> kernel_neon_begin();
> - sha1_base_do_update(desc, data, len,
> - (sha1_block_fn *)sha1_ce_transform);
> + sha1_base_do_update(desc, data, len, sha1_ce_transform);
> kernel_neon_end();
>
> return 0;
> @@ -64,10 +63,9 @@ static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
> sctx->finalize = finalize;
>
> kernel_neon_begin();
> - sha1_base_do_update(desc, data, len,
> - (sha1_block_fn *)sha1_ce_transform);
> + sha1_base_do_update(desc, data, len, sha1_ce_transform);
> if (!finalize)
> - sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
> + sha1_base_do_finalize(desc, sha1_ce_transform);
> kernel_neon_end();
> return sha1_base_finish(desc, out);
> }
> @@ -81,7 +79,7 @@ static int sha1_ce_final(struct shash_desc *desc, u8 *out)
>
> sctx->finalize = 0;
> kernel_neon_begin();
> - sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
> + sha1_base_do_finalize(desc, sha1_ce_transform);
> kernel_neon_end();
> return sha1_base_finish(desc, out);
> }
> diff --git a/arch/arm64/crypto/sha2-ce-glue.c b/arch/arm64/crypto/sha2-ce-glue.c
> index 604a01a4ede6..a4dacedfe4d4 100644
> --- a/arch/arm64/crypto/sha2-ce-glue.c
> +++ b/arch/arm64/crypto/sha2-ce-glue.c
> @@ -25,7 +25,7 @@ struct sha256_ce_state {
> u32 finalize;
> };
>
> -asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
> +asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
> int blocks);
>
> const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
> @@ -33,7 +33,8 @@ const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
> const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
> finalize);
>
> -asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
> +asmlinkage void sha256_block_data_order(struct sha256_state *sst, u8 const *src,
> + int blocks);
>
> static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
> unsigned int len)
> @@ -42,12 +43,11 @@ static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
>
> if (!crypto_simd_usable())
> return sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha256_block_data_order);
> + sha256_block_data_order);
>
> sctx->finalize = 0;
> kernel_neon_begin();
> - sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha2_ce_transform);
> + sha256_base_do_update(desc, data, len, sha2_ce_transform);
> kernel_neon_end();
>
> return 0;
> @@ -62,9 +62,8 @@ static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
> if (!crypto_simd_usable()) {
> if (len)
> sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha256_block_data_order);
> - sha256_base_do_finalize(desc,
> - (sha256_block_fn *)sha256_block_data_order);
> + sha256_block_data_order);
> + sha256_base_do_finalize(desc, sha256_block_data_order);
> return sha256_base_finish(desc, out);
> }
>
> @@ -75,11 +74,9 @@ static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
> sctx->finalize = finalize;
>
> kernel_neon_begin();
> - sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha2_ce_transform);
> + sha256_base_do_update(desc, data, len, sha2_ce_transform);
> if (!finalize)
> - sha256_base_do_finalize(desc,
> - (sha256_block_fn *)sha2_ce_transform);
> + sha256_base_do_finalize(desc, sha2_ce_transform);
> kernel_neon_end();
> return sha256_base_finish(desc, out);
> }
> @@ -89,14 +86,13 @@ static int sha256_ce_final(struct shash_desc *desc, u8 *out)
> struct sha256_ce_state *sctx = shash_desc_ctx(desc);
>
> if (!crypto_simd_usable()) {
> - sha256_base_do_finalize(desc,
> - (sha256_block_fn *)sha256_block_data_order);
> + sha256_base_do_finalize(desc, sha256_block_data_order);
> return sha256_base_finish(desc, out);
> }
>
> sctx->finalize = 0;
> kernel_neon_begin();
> - sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
> + sha256_base_do_finalize(desc, sha2_ce_transform);
> kernel_neon_end();
> return sha256_base_finish(desc, out);
> }
> diff --git a/arch/arm64/crypto/sha256-glue.c b/arch/arm64/crypto/sha256-glue.c
> index e273faca924f..dac3157937ba 100644
> --- a/arch/arm64/crypto/sha256-glue.c
> +++ b/arch/arm64/crypto/sha256-glue.c
> @@ -23,28 +23,25 @@ MODULE_LICENSE("GPL v2");
> MODULE_ALIAS_CRYPTO("sha224");
> MODULE_ALIAS_CRYPTO("sha256");
>
> -asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
> - unsigned int num_blks);
> +asmlinkage void sha256_block_data_order(struct sha256_state *sst, u8 const *src,
> + int blocks);
> EXPORT_SYMBOL(sha256_block_data_order);
>
> -asmlinkage void sha256_block_neon(u32 *digest, const void *data,
> - unsigned int num_blks);
> +asmlinkage void sha256_block_neon(struct sha256_state *sst, u8 const *src,
> + int blocks);
>
> static int crypto_sha256_arm64_update(struct shash_desc *desc, const u8 *data,
> unsigned int len)
> {
> - return sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha256_block_data_order);
> + return sha256_base_do_update(desc, data, len, sha256_block_data_order);
> }
>
> static int crypto_sha256_arm64_finup(struct shash_desc *desc, const u8 *data,
> unsigned int len, u8 *out)
> {
> if (len)
> - sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha256_block_data_order);
> - sha256_base_do_finalize(desc,
> - (sha256_block_fn *)sha256_block_data_order);
> + sha256_base_do_update(desc, data, len, sha256_block_data_order);
> + sha256_base_do_finalize(desc, sha256_block_data_order);
>
> return sha256_base_finish(desc, out);
> }
> @@ -87,7 +84,7 @@ static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
>
> if (!crypto_simd_usable())
> return sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha256_block_data_order);
> + sha256_block_data_order);
>
> while (len > 0) {
> unsigned int chunk = len;
> @@ -103,8 +100,7 @@ static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
> sctx->count % SHA256_BLOCK_SIZE;
>
> kernel_neon_begin();
> - sha256_base_do_update(desc, data, chunk,
> - (sha256_block_fn *)sha256_block_neon);
> + sha256_base_do_update(desc, data, chunk, sha256_block_neon);
> kernel_neon_end();
> data += chunk;
> len -= chunk;
> @@ -118,15 +114,13 @@ static int sha256_finup_neon(struct shash_desc *desc, const u8 *data,
> if (!crypto_simd_usable()) {
> if (len)
> sha256_base_do_update(desc, data, len,
> - (sha256_block_fn *)sha256_block_data_order);
> - sha256_base_do_finalize(desc,
> - (sha256_block_fn *)sha256_block_data_order);
> + sha256_block_data_order);
> + sha256_base_do_finalize(desc, sha256_block_data_order);
> } else {
> if (len)
> sha256_update_neon(desc, data, len);
> kernel_neon_begin();
> - sha256_base_do_finalize(desc,
> - (sha256_block_fn *)sha256_block_neon);
> + sha256_base_do_finalize(desc, sha256_block_neon);
> kernel_neon_end();
> }
> return sha256_base_finish(desc, out);
> diff --git a/arch/arm64/crypto/sha512-ce-glue.c b/arch/arm64/crypto/sha512-ce-glue.c
> index 2369540040aa..0f964235d753 100644
> --- a/arch/arm64/crypto/sha512-ce-glue.c
> +++ b/arch/arm64/crypto/sha512-ce-glue.c
> @@ -27,18 +27,18 @@ MODULE_LICENSE("GPL v2");
> asmlinkage void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
> int blocks);
>
> -asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
> +asmlinkage void sha512_block_data_order(struct sha512_state *sst, u8 const *src,
> + int blocks);
>
> static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
> unsigned int len)
> {
> if (!crypto_simd_usable())
> return sha512_base_do_update(desc, data, len,
> - (sha512_block_fn *)sha512_block_data_order);
> + sha512_block_data_order);
>
> kernel_neon_begin();
> - sha512_base_do_update(desc, data, len,
> - (sha512_block_fn *)sha512_ce_transform);
> + sha512_base_do_update(desc, data, len, sha512_ce_transform);
> kernel_neon_end();
>
> return 0;
> @@ -50,16 +50,14 @@ static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
> if (!crypto_simd_usable()) {
> if (len)
> sha512_base_do_update(desc, data, len,
> - (sha512_block_fn *)sha512_block_data_order);
> - sha512_base_do_finalize(desc,
> - (sha512_block_fn *)sha512_block_data_order);
> + sha512_block_data_order);
> + sha512_base_do_finalize(desc, sha512_block_data_order);
> return sha512_base_finish(desc, out);
> }
>
> kernel_neon_begin();
> - sha512_base_do_update(desc, data, len,
> - (sha512_block_fn *)sha512_ce_transform);
> - sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
> + sha512_base_do_update(desc, data, len, sha512_ce_transform);
> + sha512_base_do_finalize(desc, sha512_ce_transform);
> kernel_neon_end();
> return sha512_base_finish(desc, out);
> }
> @@ -67,13 +65,12 @@ static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
> static int sha512_ce_final(struct shash_desc *desc, u8 *out)
> {
> if (!crypto_simd_usable()) {
> - sha512_base_do_finalize(desc,
> - (sha512_block_fn *)sha512_block_data_order);
> + sha512_base_do_finalize(desc, sha512_block_data_order);
> return sha512_base_finish(desc, out);
> }
>
> kernel_neon_begin();
> - sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
> + sha512_base_do_finalize(desc, sha512_ce_transform);
> kernel_neon_end();
> return sha512_base_finish(desc, out);
> }
> diff --git a/arch/arm64/crypto/sha512-glue.c b/arch/arm64/crypto/sha512-glue.c
> index d915c656e5fe..0f6b610a7954 100644
> --- a/arch/arm64/crypto/sha512-glue.c
> +++ b/arch/arm64/crypto/sha512-glue.c
> @@ -20,25 +20,22 @@ MODULE_LICENSE("GPL v2");
> MODULE_ALIAS_CRYPTO("sha384");
> MODULE_ALIAS_CRYPTO("sha512");
>
> -asmlinkage void sha512_block_data_order(u32 *digest, const void *data,
> - unsigned int num_blks);
> +asmlinkage void sha512_block_data_order(struct sha512_state *sst,
> + u8 const *src, int blocks);
> EXPORT_SYMBOL(sha512_block_data_order);
>
> static int sha512_update(struct shash_desc *desc, const u8 *data,
> unsigned int len)
> {
> - return sha512_base_do_update(desc, data, len,
> - (sha512_block_fn *)sha512_block_data_order);
> + return sha512_base_do_update(desc, data, len, sha512_block_data_order);
> }
>
> static int sha512_finup(struct shash_desc *desc, const u8 *data,
> unsigned int len, u8 *out)
> {
> if (len)
> - sha512_base_do_update(desc, data, len,
> - (sha512_block_fn *)sha512_block_data_order);
> - sha512_base_do_finalize(desc,
> - (sha512_block_fn *)sha512_block_data_order);
> + sha512_base_do_update(desc, data, len, sha512_block_data_order);
> + sha512_base_do_finalize(desc, sha512_block_data_order);
>
> return sha512_base_finish(desc, out);
> }
>
> base-commit: 100d46bd72ec689a5582c2f5f4deadc5bcb92d60
> --
> 2.24.0.rc1.363.gb1bccd3e3d-goog
>
--
Kees Cook
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