diff options
author | Julia Lawall <Julia.Lawall@lip6.fr> | 2014-11-30 17:03:47 (GMT) |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-12-02 14:55:50 (GMT) |
commit | d83480b061f95db90bd9df69a21c20d0fd5c9232 (patch) | |
tree | b9f8d01de0402abde928c0bdb7dc463acb90d3ab /arch | |
parent | a6326ba025a4bc025c8c9a15ea2f307936a93843 (diff) | |
download | linux-d83480b061f95db90bd9df69a21c20d0fd5c9232.tar.xz |
crypto: powerpc - 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/)
// <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>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/powerpc/crypto/sha1.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/crypto/sha1.c b/arch/powerpc/crypto/sha1.c index 0f88c7b..d3feba5a2 100644 --- a/arch/powerpc/crypto/sha1.c +++ b/arch/powerpc/crypto/sha1.c @@ -66,7 +66,7 @@ static int sha1_update(struct shash_desc *desc, const u8 *data, src = data + done; } while (done + 63 < len); - memset(temp, 0, sizeof(temp)); + memzero_explicit(temp, sizeof(temp)); partial = 0; } memcpy(sctx->buffer + partial, src, len - done); |