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Subject[PATCH 1/2] crypto: AF_ALG - zeroize message digest buffer
Date
Zeroize the buffer holding the message digest calculated for the
consumer before the buffer is released by the hash AF_ALG interface
handler.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
---
crypto/algif_hash.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 8502462..f75db4c 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -258,6 +258,8 @@ static void hash_sock_destruct(struct sock *sk)
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;

+ memzero_explicit(ctx->result,
+ crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
sock_kfree_s(sk, ctx->result,
crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
sock_kfree_s(sk, ctx, ctx->len);
--
2.1.0



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