crypto: qat - Use memzero_explicit

Use the new memzero_explicit function to cleanup sensitive data.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 22 insertions, 14 deletions

diff --git a/drivers/crypto/qat/qat_common/qat_algs.c b/drivers/crypto/qat/qat_common/qat_algs.c
index 25a409ca2d2a..31076eac0186 100644
--- a/drivers/crypto/qat/qat_common/qat_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_algs.c
@@ -161,7 +161,7 @@ static int qat_alg_do_precomputes(struct icp_qat_hw_auth_algo_blk *hash,
         __be64 *hash512_state_out;
         int i, offset;
 
-        memset(auth_state.data, '\0', MAX_AUTH_STATE_SIZE + 64);
+        memzero_explicit(auth_state.data, MAX_AUTH_STATE_SIZE + 64);
         shash->tfm = ctx->hash_tfm;
         shash->flags = 0x0;
 
@@ -174,13 +174,13 @@ static int qat_alg_do_precomputes(struct icp_qat_hw_auth_algo_blk *hash,
 
                 memcpy(ipad, buff, digest_size);
                 memcpy(opad, buff, digest_size);
-                memset(ipad + digest_size, 0, block_size - digest_size);
-                memset(opad + digest_size, 0, block_size - digest_size);
+                memzero_explicit(ipad + digest_size, block_size - digest_size);
+                memzero_explicit(opad + digest_size, block_size - digest_size);
         } else {
                 memcpy(ipad, auth_key, auth_keylen);
                 memcpy(opad, auth_key, auth_keylen);
-                memset(ipad + auth_keylen, 0, block_size - auth_keylen);
-                memset(opad + auth_keylen, 0, block_size - auth_keylen);
+                memzero_explicit(ipad + auth_keylen, block_size - auth_keylen);
+                memzero_explicit(opad + auth_keylen, block_size - auth_keylen);
         }
 
         for (i = 0; i < block_size; i++) {
@@ -254,6 +254,8 @@ static int qat_alg_do_precomputes(struct icp_qat_hw_auth_algo_blk *hash,
         default:
                 return -EFAULT;
         }
+        memzero_explicit(ipad, block_size);
+        memzero_explicit(opad, block_size);
         return 0;
 }
 
@@ -492,12 +494,12 @@ static int qat_alg_setkey(struct crypto_aead *tfm, const uint8_t *key,
         if (ctx->enc_cd) {
                 /* rekeying */
                 dev = &GET_DEV(ctx->inst->accel_dev);
-                memset(ctx->enc_cd, 0, sizeof(struct qat_alg_cd));
-                memset(ctx->dec_cd, 0, sizeof(struct qat_alg_cd));
-                memset(&ctx->enc_fw_req_tmpl, 0,
-                       sizeof(struct icp_qat_fw_la_bulk_req));
-                memset(&ctx->dec_fw_req_tmpl, 0,
-                       sizeof(struct icp_qat_fw_la_bulk_req));
+                memzero_explicit(ctx->enc_cd, sizeof(struct qat_alg_cd));
+                memzero_explicit(ctx->dec_cd, sizeof(struct qat_alg_cd));
+                memzero_explicit(&ctx->enc_fw_req_tmpl,
+                                 sizeof(struct icp_qat_fw_la_bulk_req));
+                memzero_explicit(&ctx->dec_fw_req_tmpl,
+                                 sizeof(struct icp_qat_fw_la_bulk_req));
         } else {
                 /* new key */
                 int node = get_current_node();
@@ -534,10 +536,12 @@ static int qat_alg_setkey(struct crypto_aead *tfm, const uint8_t *key,
         return 0;
 
 out_free_all:
+        memzero_explicit(ctx->dec_cd, sizeof(struct qat_alg_cd));
         dma_free_coherent(dev, sizeof(struct qat_alg_cd),
                           ctx->dec_cd, ctx->dec_cd_paddr);
         ctx->dec_cd = NULL;
 out_free_enc:
+        memzero_explicit(ctx->enc_cd, sizeof(struct qat_alg_cd));
         dma_free_coherent(dev, sizeof(struct qat_alg_cd),
                           ctx->enc_cd, ctx->enc_cd_paddr);
         ctx->enc_cd = NULL;
@@ -832,7 +836,7 @@ static int qat_alg_init(struct crypto_tfm *tfm,
 {
         struct qat_alg_session_ctx *ctx = crypto_tfm_ctx(tfm);
 
-        memset(ctx, '\0', sizeof(*ctx));
+        memzero_explicit(ctx, sizeof(*ctx));
         ctx->hash_tfm = crypto_alloc_shash(hash_name, 0, 0);
         if (IS_ERR(ctx->hash_tfm))
                 return -EFAULT;
@@ -872,12 +876,16 @@ static void qat_alg_exit(struct crypto_tfm *tfm)
                 return;
 
         dev = &GET_DEV(inst->accel_dev);
-        if (ctx->enc_cd)
+        if (ctx->enc_cd) {
+                memzero_explicit(ctx->enc_cd, sizeof(struct qat_alg_cd));
                 dma_free_coherent(dev, sizeof(struct qat_alg_cd),
                                   ctx->enc_cd, ctx->enc_cd_paddr);
-        if (ctx->dec_cd)
+        }
+        if (ctx->dec_cd) {
+                memzero_explicit(ctx->dec_cd, sizeof(struct qat_alg_cd));
                 dma_free_coherent(dev, sizeof(struct qat_alg_cd),
                                   ctx->dec_cd, ctx->dec_cd_paddr);
+        }
         qat_crypto_put_instance(inst);
 }