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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2016-09-20 20:35:55 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-09-22 17:42:07 +0800 |
| commit | 456bee986e0a372ad4beed5d3cedb3622633d9df (patch) | |
| tree | f15f1e438e2b88d6ecae117947a9cf90de1f28ba /security | |
| parent | 2db34e78f126c6001d79d3b66ab1abb482dc7caa (diff) | |
| download | lwn-456bee986e0a372ad4beed5d3cedb3622633d9df.tar.gz lwn-456bee986e0a372ad4beed5d3cedb3622633d9df.zip | |
KEYS: Fix skcipher IV clobbering
The IV must not be modified by the skcipher operation so we need
to duplicate it.
Fixes: c3917fd9dfbc ("KEYS: Use skcipher")
Cc: stable@vger.kernel.org
Reported-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'security')
| -rw-r--r-- | security/keys/encrypted-keys/encrypted.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c index 5adbfc32242f..17a06105ccb6 100644 --- a/security/keys/encrypted-keys/encrypted.c +++ b/security/keys/encrypted-keys/encrypted.c @@ -29,6 +29,7 @@ #include <linux/rcupdate.h> #include <linux/scatterlist.h> #include <linux/ctype.h> +#include <crypto/aes.h> #include <crypto/hash.h> #include <crypto/sha.h> #include <crypto/skcipher.h> @@ -478,6 +479,7 @@ static int derived_key_encrypt(struct encrypted_key_payload *epayload, struct crypto_skcipher *tfm; struct skcipher_request *req; unsigned int encrypted_datalen; + u8 iv[AES_BLOCK_SIZE]; unsigned int padlen; char pad[16]; int ret; @@ -500,8 +502,8 @@ static int derived_key_encrypt(struct encrypted_key_payload *epayload, sg_init_table(sg_out, 1); sg_set_buf(sg_out, epayload->encrypted_data, encrypted_datalen); - skcipher_request_set_crypt(req, sg_in, sg_out, encrypted_datalen, - epayload->iv); + memcpy(iv, epayload->iv, sizeof(iv)); + skcipher_request_set_crypt(req, sg_in, sg_out, encrypted_datalen, iv); ret = crypto_skcipher_encrypt(req); tfm = crypto_skcipher_reqtfm(req); skcipher_request_free(req); @@ -581,6 +583,7 @@ static int derived_key_decrypt(struct encrypted_key_payload *epayload, struct crypto_skcipher *tfm; struct skcipher_request *req; unsigned int encrypted_datalen; + u8 iv[AES_BLOCK_SIZE]; char pad[16]; int ret; @@ -599,8 +602,8 @@ static int derived_key_decrypt(struct encrypted_key_payload *epayload, epayload->decrypted_datalen); sg_set_buf(&sg_out[1], pad, sizeof pad); - skcipher_request_set_crypt(req, sg_in, sg_out, encrypted_datalen, - epayload->iv); + memcpy(iv, epayload->iv, sizeof(iv)); + skcipher_request_set_crypt(req, sg_in, sg_out, encrypted_datalen, iv); ret = crypto_skcipher_decrypt(req); tfm = crypto_skcipher_reqtfm(req); skcipher_request_free(req); |