linux-kernel - Re: [PATCH] ELF: implement AT

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Date:	Fri, 3 Oct 2008 02:43:40 +0200
From:	Jakub Jelinek <jakub@...hat.com>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org,
	Ulrich Drepper <drepper@...hat.com>, libc-alpha@...rceware.org
Subject: Re: [PATCH] ELF: implement AT_RANDOM for future glibc use

On Thu, Oct 02, 2008 at 05:16:16PM -0700, Kees Cook wrote:
> @@ -196,6 +198,18 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
>  			return -EFAULT;
>  	}
>  
> +	rand_size = CONFIG_SECURITY_AUXV_RANDOM_SIZE * sizeof(unsigned long);

I believe you want sizeof (elf_addr_t) here instead.

> +	u_rand_bytes = NULL;
> +	if (rand_size) {
> +		unsigned char k_rand_bytes[CONFIG_SECURITY_AUXV_RANDOM_SIZE *
> +					   sizeof(unsigned long)];

And here too, because having a 64-bit kernel supply twice as much random
data to 32-bit programs as a 32-bit kernel would supply would be certainly
unexpected.

	Jakub
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