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authorDavid Gstir2024-10-29 12:34:01 +0100
committerJarkko Sakkinen2024-11-04 21:24:24 +0200
commit04de7589e0a95167d803ecadd115235ba2c14997 (patch)
treeb2e3a1930c02ea031322140bd081a8dfe12e2584
parent4a74da044ec9ec8679e6beccc4306b936b62873f (diff)
KEYS: trusted: dcp: fix NULL dereference in AEAD crypto operation
When sealing or unsealing a key blob we currently do not wait for the AEAD cipher operation to finish and simply return after submitting the request. If there is some load on the system we can exit before the cipher operation is done and the buffer we read from/write to is already removed from the stack. This will e.g. result in NULL pointer dereference errors in the DCP driver during blob creation. Fix this by waiting for the AEAD cipher operation to finish before resuming the seal and unseal calls. Cc: stable@vger.kernel.org # v6.10+ Fixes: 0e28bf61a5f9 ("KEYS: trusted: dcp: fix leak of blob encryption key") Reported-by: Parthiban N <parthiban@linumiz.com> Closes: https://lore.kernel.org/keyrings/254d3bb1-6dbc-48b4-9c08-77df04baee2f@linumiz.com/ Signed-off-by: David Gstir <david@sigma-star.at> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
-rw-r--r--security/keys/trusted-keys/trusted_dcp.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/security/keys/trusted-keys/trusted_dcp.c b/security/keys/trusted-keys/trusted_dcp.c
index 4edc5bbbcda3..e908c53a803c 100644
--- a/security/keys/trusted-keys/trusted_dcp.c
+++ b/security/keys/trusted-keys/trusted_dcp.c
@@ -133,6 +133,7 @@ static int do_aead_crypto(u8 *in, u8 *out, size_t len, u8 *key, u8 *nonce,
struct scatterlist src_sg, dst_sg;
struct crypto_aead *aead;
int ret;
+ DECLARE_CRYPTO_WAIT(wait);
aead = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(aead)) {
@@ -163,8 +164,8 @@ static int do_aead_crypto(u8 *in, u8 *out, size_t len, u8 *key, u8 *nonce,
}
aead_request_set_crypt(aead_req, &src_sg, &dst_sg, len, nonce);
- aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL,
- NULL);
+ aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_SLEEP,
+ crypto_req_done, &wait);
aead_request_set_ad(aead_req, 0);
if (crypto_aead_setkey(aead, key, AES_KEYSIZE_128)) {
@@ -174,9 +175,9 @@ static int do_aead_crypto(u8 *in, u8 *out, size_t len, u8 *key, u8 *nonce,
}
if (do_encrypt)
- ret = crypto_aead_encrypt(aead_req);
+ ret = crypto_wait_req(crypto_aead_encrypt(aead_req), &wait);
else
- ret = crypto_aead_decrypt(aead_req);
+ ret = crypto_wait_req(crypto_aead_decrypt(aead_req), &wait);
free_req:
aead_request_free(aead_req);