On 30 November 2014 at 18:03, Julia Lawall <Julia.Lawall@xxxxxxx> wrote: > From: Julia Lawall <Julia.Lawall@xxxxxxx> > > 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@xxxxxxxxxx> > > Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx> > > --- > Daniel Borkmann suggested that these patches could go through Herbert Xu's > cryptodev tree. > > I was not able to compile this one. > Builds fine for me Acked-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > 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; > } > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
