linux-kernel - Re: [PATCH v3] x86, kaslr: Prevent .bss from overlaping initrd

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Message-ID: <xr934mtx9rgx.fsf@gthelen.mtv.corp.google.com>
Date:	Mon, 17 Nov 2014 18:23:42 -0800
From:	Greg Thelen <gthelen@...gle.com>
To:	Junjie Mao <eternal.n08@...il.com>
Cc:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Josh Triplett <josh@...htriplett.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Fengguang Wu <fengguang.wu@...el.com>, stable@...r.kernel.org
Subject: Re: [PATCH v3] x86, kaslr: Prevent .bss from overlaping initrd


On Mon, Nov 17 2014, Greg Thelen wrote:
[...]
> Given that bss and brk are nobits (i.e. only ALLOC) sections, does
> file_offset make sense as a load address.  This fails with gold:
>
> $ git checkout v3.18-rc5
> $ make  # with gold
> [...]
> ..bss and .brk lack common file offset
> ..bss and .brk lack common file offset
> ..bss and .brk lack common file offset
> ..bss and .brk lack common file offset
>   MKPIGGY arch/x86/boot/compressed/piggy.S
> Usage: arch/x86/boot/compressed/mkpiggy compressed_file run_size
> make[2]: *** [arch/x86/boot/compressed/piggy.S] Error 1
> make[1]: *** [arch/x86/boot/compressed/vmlinux] Error 2
> make: *** [bzImage] Error 2
[...]

I just saw http://www.spinics.net/lists/kernel/msg1869328.html which
fixes things for me.  Sorry for the noise.
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