Re: [PATCH 8/8] wusb: replace memset by memzero_explicit

From: Daniel Borkmann
Date: Tue Dec 02 2014 - 19:19:48 EST

On 12/03/2014 01:14 AM, Greg Kroah-Hartman wrote:
On Sun, Nov 30, 2014 at 05:59:34PM +0100, Julia Lawall wrote:
From: Julia Lawall <julia@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: (

// <smpl>
identifier x;
type T;

... when any
T x[...];
... when any
when exists
- memset
+ memzero_explicit
... when != x
when strict
// </smpl>

This change was suggested by Daniel Borkmann <dborkman@xxxxxxxxxx>

Signed-off-by: Julia Lawall <julia@xxxxxxx>

Daniel Borkmann suggested that these patches could go through Herbert Xu's
cryptodev tree.

Why? There's no dependancy on anything in the cryptodev tree,
memzero_explicit is in Linus's tree now.

Sorry, I guess this was not really clear, that comment actually only
refers to the arch/*/crypto/ patches.

Anyway, thanks for queueing this up, Greg.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at