linux-kernel - Re: [tip:x86/urgent] x86/boot: Prevent KASLR and memmap collision

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Date:   Tue, 20 Dec 2016 11:23:51 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, hpa@...or.com
Cc:     linux-tip-commits@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [tip:x86/urgent] x86/boot: Prevent KASLR and memmap collision



On 12/20/2016 01:31 AM, Ingo Molnar wrote:
> 
> * tip-bot for Dave Jiang <tipbot@...or.com> wrote:
> 
>> Commit-ID:  d1a5058c063d9e0aaaf4d360d0f8074ee55ed096
>> Gitweb:     http://git.kernel.org/tip/d1a5058c063d9e0aaaf4d360d0f8074ee55ed096
>> Author:     Dave Jiang <dave.jiang@...el.com>
>> AuthorDate: Tue, 29 Nov 2016 12:26:40 -0700
>> Committer:  Thomas Gleixner <tglx@...utronix.de>
>> CommitDate: Mon, 19 Dec 2016 12:27:52 +0100
>>
>> x86/boot: Prevent KASLR and memmap collision
> 
> This commit breaks the 32-bit build (allyesconfig32 and allmodconfig32):
> 
>  ld: -r and -shared may not be used together
>  scripts/Makefile.build:293: recipe for target 'arch/x86/boot/compressed/kaslr.o' failed
>  make[2]: *** [arch/x86/boot/compressed/kaslr.o] Error 1
>  make[2]: *** Waiting for unfinished jobs....
> 
> Thanks,
> 
> 	Ingo
> 

Looks like including lib/cmdline.c causes the issue. I'll need to find a
way around it.