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KEYS: do not kmemdup digest in {public,tpm}_key_verify_signature 

Treat (struct public_key_signature)'s digest same as its signature (s).
Since digest should be already in the kmalloc'd memory do not kmemdup
digest value before calling {public,tpm}_key_verify_signature.

Patch is split from the previous as suggested by Herbert Xu.

Suggested-by: David Howells <dhowells@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: keyrings@vger.kernel.org
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Reviewed-by: Denis Kenzior <denkenz@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Vitaly Chikunov 2019-04-11 18:51:16 +03:00 committed by Herbert Xu
parent c7381b0128
commit 83bc029996
2 changed files with 2 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
crypto/asymmetric_keys/asym_tpm.c
View File

@ -748,7 +748,6 @@ static int tpm_key_verify_signature(const struct key *key,
char alg_name[CRYPTO_MAX_ALG_NAME];
uint8_t der_pub_key[PUB_KEY_BUF_SIZE];
uint32_t der_pub_key_len;
void *digest;
int ret;
pr_devel("==>%s()\n", __func__);
@ -780,14 +779,9 @@ static int tpm_key_verify_signature(const struct key *key,
if (!req)
goto error_free_tfm;
ret = -ENOMEM;
digest = kmemdup(sig->digest, sig->digest_size, GFP_KERNEL);
if (!digest)
goto error_free_req;
sg_init_table(src_sg, 2);
sg_set_buf(&src_sg[0], sig->s, sig->s_size);
sg_set_buf(&src_sg[1], digest, sig->digest_size);
sg_set_buf(&src_sg[1], sig->digest, sig->digest_size);
akcipher_request_set_crypt(req, src_sg, NULL, sig->s_size,
sig->digest_size);
crypto_init_wait(&cwait);
@ -796,8 +790,6 @@ static int tpm_key_verify_signature(const struct key *key,
crypto_req_done, &cwait);
ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait);
kfree(digest);
error_free_req:
akcipher_request_free(req);
error_free_tfm:
crypto_free_akcipher(tfm);

9
crypto/asymmetric_keys/public_key.c
View File

@ -229,7 +229,6 @@ int public_key_verify_signature(const struct public_key *pkey,
struct akcipher_request *req;
struct scatterlist src_sg[2];
char alg_name[CRYPTO_MAX_ALG_NAME];
void *digest;
int ret;
pr_devel("==>%s()\n", __func__);
@ -262,14 +261,9 @@ int public_key_verify_signature(const struct public_key *pkey,
if (ret)
goto error_free_req;
ret = -ENOMEM;
digest = kmemdup(sig->digest, sig->digest_size, GFP_KERNEL);
if (!digest)
goto error_free_req;
sg_init_table(src_sg, 2);
sg_set_buf(&src_sg[0], sig->s, sig->s_size);
sg_set_buf(&src_sg[1], digest, sig->digest_size);
sg_set_buf(&src_sg[1], sig->digest, sig->digest_size);
akcipher_request_set_crypt(req, src_sg, NULL, sig->s_size,
sig->digest_size);
crypto_init_wait(&cwait);
@ -278,7 +272,6 @@ int public_key_verify_signature(const struct public_key *pkey,
crypto_req_done, &cwait);
ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait);
kfree(digest);
error_free_req:
akcipher_request_free(req);
error_free_tfm: