From f43c2394072f3bc36bdc11f2decceaa4cbac9eec Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Sun, 30 Nov 2014 18:03:48 +0100 Subject: [PATCH] crypto: arm - replace memset by memzero_explicit Memset on a local variable may be removed when it is called just before the variable goes out of scope. Using memzero_explicit defeats this optimization. A simplified version of the semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // @@ identifier x; type T; @@ { ... when any T x[...]; ... when any when exists - memset + memzero_explicit (x, -0, ...) ... when != x when strict } // This change was suggested by Daniel Borkmann Signed-off-by: Julia Lawall Acked-by: Ard Biesheuvel Signed-off-by: Herbert Xu --- arch/arm/crypto/sha512_neon_glue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/crypto/sha512_neon_glue.c b/arch/arm/crypto/sha512_neon_glue.c index f3452c66059d..b124dce838d6 100644 --- a/arch/arm/crypto/sha512_neon_glue.c +++ b/arch/arm/crypto/sha512_neon_glue.c @@ -241,7 +241,7 @@ static int sha384_neon_final(struct shash_desc *desc, u8 *hash) sha512_neon_final(desc, D); memcpy(hash, D, SHA384_DIGEST_SIZE); - memset(D, 0, SHA512_DIGEST_SIZE); + memzero_explicit(D, SHA512_DIGEST_SIZE); return 0; } -- 2.34.1