crypto: algif - add and use sock_kzfree_s() instead of memzero_explicit()

Commit e1bd95bf7c25 ("crypto: algif - zeroize IV buffer") and
2a6af25befd0 ("crypto: algif - zeroize message digest buffer")
added memzero_explicit() calls on buffers that are later on
passed back to sock_kfree_s().

This is a discussed follow-up that, instead, extends the sock
API and adds sock_kzfree_s(), which internally uses kzfree()
instead of kfree() for passing the buffers back to slab.

Having sock_kzfree_s() allows to keep the changes more minimal
by just having a drop-in replacement instead of adding
memzero_explicit() calls everywhere before sock_kfree_s().

In kzfree(), the compiler is not allowed to optimize the memset()
away and thus there's no need for memzero_explicit(). Both,
sock_kfree_s() and sock_kzfree_s() are wrappers for
__sock_kfree_s() and call into kfree() resp. kzfree(); here,
__sock_kfree_s() needs to be explicitly inlined as we want the
compiler to optimize the call and condition away and thus it
produces e.g. on x86_64 the _same_ assembler output for
sock_kfree_s() before and after, and thus also allows for
avoiding code duplication.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 3 insertions, 6 deletions

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index f75db4ce48bf..e6050396a3b3 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -258,10 +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_kzfree_s(sk, ctx->result,
+                      crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
         sock_kfree_s(sk, ctx, ctx->len);
         af_alg_release_parent(sk);
 }
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 85e3bdbe214c..34389964000d 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -566,8 +566,7 @@ static void skcipher_sock_destruct(struct sock *sk)
         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
 
         skcipher_free_sgl(sk);
-        memzero_explicit(ctx->iv, crypto_ablkcipher_ivsize(tfm));
-        sock_kfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm));
+        sock_kzfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm));
         sock_kfree_s(sk, ctx, ctx->len);
         af_alg_release_parent(sk);
 }