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Subject[PATCH v3] crypto: gcm - restrict assoclen for rfc4543
Date
Based on seqiv, IPsec ESP and rfc4543/rfc4106 the assoclen can be 16 or
20 bytes.

From esp4/esp6, assoclen is sizeof IP Header. This includes spi, seq_no
and extended seq_no, that is 8 or 12 bytes.
In seqiv, to asscolen is added the IV size (8 bytes).
Therefore, the assoclen, for rfc4543, should be restricted to 16 or 20
bytes, as for rfc4106.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
---
Changes since v2:
- use, newly renamed, helper functions added in crypto API, in series:
https://patchwork.kernel.org/project/linux-crypto/list/?series=152649

crypto/gcm.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/crypto/gcm.c b/crypto/gcm.c
index 2f3b50f..7eb5ced 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -1034,11 +1034,23 @@ static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)

static int crypto_rfc4543_encrypt(struct aead_request *req)
{
+ int err;
+
+ err = crypto_ipsec_check_assoclen(req->assoclen);
+ if (err)
+ return err;
+
return crypto_rfc4543_crypt(req, true);
}

static int crypto_rfc4543_decrypt(struct aead_request *req)
{
+ int err;
+
+ err = crypto_ipsec_check_assoclen(req->assoclen);
+ if (err)
+ return err;
+
return crypto_rfc4543_crypt(req, false);
}

--
2.1.0
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