linux-kernel - Re: [PATCH] x86, kaslr: Prevent .bss from overlaping initrd

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Message-ID: <20141030150541.GA17461@wfg-t540p.sh.intel.com>
Date:	Thu, 30 Oct 2014 23:05:41 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Junjie Mao <eternal.n08@...il.com>
Cc:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, kaslr: Prevent .bss from overlaping initrd

Hi Junjie,

I got one error with this script:

awk: arch/x86/tools/calc_reserved.awk: line 23: function strtonum never defined

Have you tried both gawk/mawk?

Thanks,
Fengguang

> diff --git a/arch/x86/tools/calc_reserved.awk b/arch/x86/tools/calc_reserved.awk
> new file mode 100644
> index 000000000000..2ca69682338a
> --- /dev/null
> +++ b/arch/x86/tools/calc_reserved.awk
> @@ -0,0 +1,21 @@
> +#!/bin/awk -f
> +#
> +# Calculate the amount of space that we have to reserve for .bss and .brk
> +# sections
> +#
> +# Usage:
> +# objdump -h a.out | awk -f calc_reserved.awk
> +
> +BEGIN {
> +	sections = "^.bss$|^.brk$"
> +	size = 0;
> +}
> +
> +/^ *[0-9]+ [a-z._]+ *[0-9a-f]+/ {
> +	if (match($2, sections))
> +		size += strtonum("0x" $3);
> +}
> +
> +END {
> +	printf("%d\n", size);
> +}
> --
> 1.9.3
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