Messages in this thread Patch in this message | | | From | Julia Lawall <> | Subject | [PATCH 7/8 v2] crypto: replace memset by memzero_explicit | Date | Sun, 30 Nov 2014 18:03:48 +0100 |
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From: Julia Lawall <Julia.Lawall@lip6.fr>
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/)
// <smpl> @@ identifier x; type T; @@
{ ... when any T x[...]; ... when any when exists - memset + memzero_explicit (x, -0, ...) ... when != x when strict } // </smpl>
This change was suggested by Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
--- Daniel Borkmann suggested that these patches could go through Herbert Xu's cryptodev tree.
I was not able to compile this one.
v2: fixed email address
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 f3452c6..b124dce 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; }
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