linux-kernel - Re: [PATCH 1/8] x86, kaslr: get kaslr

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Message-ID: <CAE9FiQV-xSqi-KqgafFL87epGobKmz6Ci_ood3ZtDSFPgSuG6Q@mail.gmail.com>
Date:	Mon, 2 Mar 2015 10:58:23 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...e.de>
Cc:	Ingo Molnar <mingo@...nel.org>, Jiri Kosina <jkosina@...e.cz>,
	Kees Cook <keescook@...omium.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 1/8] x86, kaslr: get kaslr_enabled back correctly

On Mon, Mar 2, 2015 at 6:53 AM, Borislav Petkov <bp@...e.de> wrote:
> Well, it seems to work here but it still doesn't look reliable enough to
> me. And this addon_zo thing of arbitrary 256K is strange.

Thanks for check that out.

That is not arbitrary number. Need to make that bigger than _end - _rodata

> objdump -t arch/x86/boot/compressed/vmlinux | grep \ _end
0000000000996000 g       .pgtable    0000000000000000 _end
> objdump -t arch/x86/boot/compressed/vmlinux | grep \ _rodata
0000000000981780 g       .rodata    0000000000000000 _rodata

We only get that size after arch/x86/boot/compressed/vmlinux

but need number during building kernel vmlinux.

other way would be just increase init_size in arch/x86/boot/header.S
instead of put it BRK area.

Thanks

Yinghai
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