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Donenfeld" , Ard Biesheuvel , Antoine Tenart , Herbert Xu , "David S. Miller" Cc: x86@kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 03/11] crypto: safexcel - zeroize crypto_aes_ctx with __cleanup(aes_zeroize_ctx) Date: Thu, 13 Aug 2026 15:49:41 +0200 Message-ID: <20260813134953.979481-4-thuth@redhat.com> In-Reply-To: <20260813134953.979481-1-thuth@redhat.com> References: <20260813134953.979481-1-thuth@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 From: Thomas Huth The code clears the crypto_aes_ctx in most cases already with memzero_explicit(), but safexcel_skcipher_aesxts_setkey() runs aes_expandkey() twice, and in case the second call fails, the context from the first call is leaked. To fix this issue and to avoid future similar problems, let's use the new __cleanup(aes_zeroize_ctx) mechanism to make sure that we always clear the crypto_aes_ctx in all cases. Acked-by: Antoine Tenart Signed-off-by: Thomas Huth --- drivers/crypto/inside-secure/safexcel_cipher.c | 13 ++++--------- drivers/crypto/inside-secure/safexcel_hash.c | 3 +-- 2 files changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/crypto/inside-secure/safexcel_cipher.c b/drivers/crypto/inside-secure/safexcel_cipher.c index f07d043c67d45..b031cb9652ec3 100644 --- a/drivers/crypto/inside-secure/safexcel_cipher.c +++ b/drivers/crypto/inside-secure/safexcel_cipher.c @@ -375,7 +375,7 @@ static int safexcel_skcipher_aes_setkey(struct crypto_skcipher *ctfm, struct crypto_tfm *tfm = crypto_skcipher_tfm(ctfm); struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm); struct safexcel_crypto_priv *priv = ctx->base.priv; - struct crypto_aes_ctx aes; + struct crypto_aes_ctx aes __cleanup(aes_zeroize_ctx); int ret, i; ret = aes_expandkey(&aes, key, len); @@ -396,7 +396,6 @@ static int safexcel_skcipher_aes_setkey(struct crypto_skcipher *ctfm, ctx->key_len = len; - memzero_explicit(&aes, sizeof(aes)); return 0; } @@ -1361,7 +1360,7 @@ static int safexcel_skcipher_aesctr_setkey(struct crypto_skcipher *ctfm, struct crypto_tfm *tfm = crypto_skcipher_tfm(ctfm); struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm); struct safexcel_crypto_priv *priv = ctx->base.priv; - struct crypto_aes_ctx aes; + struct crypto_aes_ctx aes __cleanup(aes_zeroize_ctx); int ret, i; unsigned int keylen; @@ -1387,7 +1386,6 @@ static int safexcel_skcipher_aesctr_setkey(struct crypto_skcipher *ctfm, ctx->key_len = keylen; - memzero_explicit(&aes, sizeof(aes)); return 0; } @@ -2541,7 +2539,7 @@ static int safexcel_skcipher_aesxts_setkey(struct crypto_skcipher *ctfm, struct crypto_tfm *tfm = crypto_skcipher_tfm(ctfm); struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm); struct safexcel_crypto_priv *priv = ctx->base.priv; - struct crypto_aes_ctx aes; + struct crypto_aes_ctx aes __cleanup(aes_zeroize_ctx); int ret, i; unsigned int keylen; @@ -2589,7 +2587,6 @@ static int safexcel_skcipher_aesxts_setkey(struct crypto_skcipher *ctfm, ctx->key_len = keylen << 1; - memzero_explicit(&aes, sizeof(aes)); return 0; } @@ -2755,12 +2752,11 @@ static int safexcel_aead_ccm_setkey(struct crypto_aead *ctfm, const u8 *key, struct crypto_tfm *tfm = crypto_aead_tfm(ctfm); struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm); struct safexcel_crypto_priv *priv = ctx->base.priv; - struct crypto_aes_ctx aes; + struct crypto_aes_ctx aes __cleanup(aes_zeroize_ctx); int ret, i; ret = aes_expandkey(&aes, key, len); if (ret) { - memzero_explicit(&aes, sizeof(aes)); return ret; } @@ -2789,7 +2785,6 @@ static int safexcel_aead_ccm_setkey(struct crypto_aead *ctfm, const u8 *key, else ctx->hash_alg = CONTEXT_CONTROL_CRYPTO_ALG_XCBC128; - memzero_explicit(&aes, sizeof(aes)); return 0; } diff --git a/drivers/crypto/inside-secure/safexcel_hash.c b/drivers/crypto/inside-secure/safexcel_hash.c index 3402e570d045c..20c17eb09495e 100644 --- a/drivers/crypto/inside-secure/safexcel_hash.c +++ b/drivers/crypto/inside-secure/safexcel_hash.c @@ -1905,7 +1905,7 @@ static int safexcel_cbcmac_setkey(struct crypto_ahash *tfm, const u8 *key, unsigned int len) { struct safexcel_ahash_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm)); - struct crypto_aes_ctx aes; + struct crypto_aes_ctx aes __cleanup(aes_zeroize_ctx); int ret, i; ret = aes_expandkey(&aes, key, len); @@ -1928,7 +1928,6 @@ static int safexcel_cbcmac_setkey(struct crypto_ahash *tfm, const u8 *key, } ctx->cbcmac = true; - memzero_explicit(&aes, sizeof(aes)); return 0; } -- 2.55.0