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authorArvind Sankar <nivedita@alum.mit.edu>2020-10-25 10:31:15 -0400
committerHerbert Xu <herbert@gondor.apana.org.au>2020-10-30 17:35:03 +1100
commit458c0480dcb338d7b72e89b2e88a622965adcea4 (patch)
treeb51f08386220bcd60c1a909f73f36233057acfe2 /arch/arm64/crypto
parent1762818f25f3f99c5083caa13d69e5e5aa2e4b6f (diff)
downloadlinux-458c0480dcb338d7b72e89b2e88a622965adcea4.tar.gz
crypto: hash - Use memzero_explicit() for clearing state
Without the barrier_data() inside memzero_explicit(), the compiler may optimize away the state-clearing if it can tell that the state is not used afterwards. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/arm64/crypto')
-rw-r--r--arch/arm64/crypto/ghash-ce-glue.c2
-rw-r--r--arch/arm64/crypto/poly1305-glue.c2
-rw-r--r--arch/arm64/crypto/sha3-ce-glue.c2
3 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm64/crypto/ghash-ce-glue.c b/arch/arm64/crypto/ghash-ce-glue.c
index 8536008e3e35..2427e2f3a9a1 100644
--- a/arch/arm64/crypto/ghash-ce-glue.c
+++ b/arch/arm64/crypto/ghash-ce-glue.c
@@ -168,7 +168,7 @@ static int ghash_final(struct shash_desc *desc, u8 *dst)
put_unaligned_be64(ctx->digest[1], dst);
put_unaligned_be64(ctx->digest[0], dst + 8);
- *ctx = (struct ghash_desc_ctx){};
+ memzero_explicit(ctx, sizeof(*ctx));
return 0;
}
diff --git a/arch/arm64/crypto/poly1305-glue.c b/arch/arm64/crypto/poly1305-glue.c
index f33ada70c4ed..683de671741a 100644
--- a/arch/arm64/crypto/poly1305-glue.c
+++ b/arch/arm64/crypto/poly1305-glue.c
@@ -177,7 +177,7 @@ void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst)
}
poly1305_emit(&dctx->h, dst, dctx->s);
- *dctx = (struct poly1305_desc_ctx){};
+ memzero_explicit(dctx, sizeof(*dctx));
}
EXPORT_SYMBOL(poly1305_final_arch);
diff --git a/arch/arm64/crypto/sha3-ce-glue.c b/arch/arm64/crypto/sha3-ce-glue.c
index 9a4bbfc45f40..e5a2936f0886 100644
--- a/arch/arm64/crypto/sha3-ce-glue.c
+++ b/arch/arm64/crypto/sha3-ce-glue.c
@@ -94,7 +94,7 @@ static int sha3_final(struct shash_desc *desc, u8 *out)
if (digest_size & 4)
put_unaligned_le32(sctx->st[i], (__le32 *)digest);
- *sctx = (struct sha3_state){};
+ memzero_explicit(sctx, sizeof(*sctx));
return 0;
}