linux-kernel - Re: [PATCH] keys/encrypted: Fix two crypto-on-the-stack bugs

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Date:   Mon, 12 Dec 2016 22:28:26 +0000
From:   David Howells <dhowells@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     dhowells@...hat.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, keyrings@...r.kernel.org,
        Eric Biggers <ebiggers3@...il.com>,
        linux-crypto@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Stephan Mueller <smueller@...onox.de>
Subject: Re: [PATCH] keys/encrypted: Fix two crypto-on-the-stack bugs

Andy Lutomirski <luto@...nel.org> wrote:

> +static const char zero_pad[16] = {0};

Isn't there a global page of zeros or something that we can share?  Also, you
shouldn't explicitly initialise it so that it stays in .bss.

> -	sg_set_buf(&sg_out[1], pad, sizeof pad);
> +	sg_set_buf(&sg_out[1], zero_pad, sizeof zero_pad);

Can you put brackets on the sizeof?

Thanks,
David