linux-kernel - Re: [PATCH v4 3/4] x86, boot: Implement ASLR for kernel memory sections (x86

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Message-ID: <CAJcbSZFJD3JU2NMVfvNoAqvwE1L1pC-C6kfs7k6-DFk5pN3r4g@mail.gmail.com>
Date:	Thu, 12 May 2016 09:57:26 -0700
From:	Thomas Garnier <thgarnie@...gle.com>
To:	kbuild test robot <lkp@...el.com>
Cc:	kbuild-all@...org, "H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
	Andy Lutomirski <luto@...nel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Kees Cook <keescook@...omium.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Jonathan Corbet <corbet@....net>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Toshi Kani <toshi.kani@....com>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	Alexander Popov <alpopov@...ecurity.com>,
	Joerg Roedel <jroedel@...e.de>, Dave Young <dyoung@...hat.com>,
	Baoquan He <bhe@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Mark Salter <msalter@...hat.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org,
	Greg Thelen <gthelen@...gle.com>,
	kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v4 3/4] x86, boot: Implement ASLR for kernel memory
 sections (x86_64)

Sorry about that. I will fix and send a new iteration this afternoon.

Thomas

On Thu, May 12, 2016 at 9:27 AM, kbuild test robot <lkp@...el.com> wrote:
> Hi,
>
> [auto build test ERROR on next-20160512]
> [cannot apply to tip/x86/core v4.6-rc7 v4.6-rc6 v4.6-rc5 v4.6-rc7]
> [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
>
> url:    https://github.com/0day-ci/linux/commits/Thomas-Garnier/x86-boot-KASLR-memory-randomization/20160513-001319
> config: i386-tinyconfig (attached as .config)
> compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386
>
> Note: the linux-review/Thomas-Garnier/x86-boot-KASLR-memory-randomization/20160513-001319 HEAD cc523b95f012eb1d78508133b5b19b0a561ed3e1 builds fine.
>       It only hurts bisectibility.
>
> All errors (new ones prefixed by >>):
>
>    arch/x86/mm/init.c: In function 'init_mem_mapping':
>>> arch/x86/mm/init.c:595:2: error: 'trampoline_pgd_entry' undeclared (first use in this function)
>      trampoline_pgd_entry = init_level4_pgt[pgd_index(__PAGE_OFFSET)];
>      ^~~~~~~~~~~~~~~~~~~~
>    arch/x86/mm/init.c:595:2: note: each undeclared identifier is reported only once for each function it appears in
>>> arch/x86/mm/init.c:595:25: error: 'init_level4_pgt' undeclared (first use in this function)
>      trampoline_pgd_entry = init_level4_pgt[pgd_index(__PAGE_OFFSET)];
>                             ^~~~~~~~~~~~~~~
>
> vim +/trampoline_pgd_entry +595 arch/x86/mm/init.c
>
>    589  #endif
>    590
>    591          /* the ISA range is always mapped regardless of memory holes */
>    592          init_memory_mapping(0, ISA_END_ADDRESS);
>    593
>    594          /* Default trampoline pgd value */
>  > 595          trampoline_pgd_entry = init_level4_pgt[pgd_index(__PAGE_OFFSET)];
>    596
>    597          /* Init the trampoline page table if needed for KASLR memory */
>    598          kaslr_trampoline_init();
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation