Re: [mel:mm-vmscan-node-lru-v7r3 38/200] slub.c:undefined reference to `cache_random_seq_create'

[Kees Cook <keescook@chromium.org>]

On Mon, Jun 13, 2016 at 2:11 PM, Andrew Morton
<akpm@linux-foundation.org> wrote:
> On Tue, 14 Jun 2016 03:37:57 +0800 kbuild test robot <fengguang.wu@intel.com> wrote:
>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux mm-vmscan-node-lru-v7r3
>> head:   276a5614a25ce20248f42bd4fb025b80ae0c9be1
>> commit: 44c61fe5d7f13025a2a1f6efbbc0da75ad93ee19 [38/200] mm: SLUB freelist randomization
>> config: x86_64-randconfig-x018-06140033 (attached as .config)
>> compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
>> reproduce:
>>         git checkout 44c61fe5d7f13025a2a1f6efbbc0da75ad93ee19
>>         # save the attached .config to linux build tree
>>         make ARCH=x86_64
>>
>> All errors (new ones prefixed by >>):
>>
>>    mm/built-in.o: In function `init_cache_random_seq':
>> >> slub.c:(.text+0x507dc): undefined reference to `cache_random_seq_create'
>>    mm/built-in.o: In function `__kmem_cache_release':
>> >> (.text+0x53979): undefined reference to `cache_random_seq_destroy'

With that config, I get these errors.

> I don't even get that far with that .config.  With gcc-4.4.4 I get
>
> init/built-in.o: In function `initcall_blacklisted':
> main.c:(.text+0x41): undefined reference to `__stack_chk_guard'
> main.c:(.text+0xbe): undefined reference to `__stack_chk_guard'
> init/built-in.o: In function `do_one_initcall':
> (.text+0xeb): undefined reference to `__stack_chk_guard'
> init/built-in.o: In function `do_one_initcall':
> (.text+0x22b): undefined reference to `__stack_chk_guard'
> init/built-in.o: In function `name_to_dev_t':
> (.text+0x320): undefined reference to `__stack_chk_guard'
> init/built-in.o:(.text+0x52e): more undefined references to `__stack_chk_guard'

This, I don't. I'm scratching my head about how that's possible. The
__stack_chk_guard is a compiler alias on x86...

> Kees touched it last :)

I'll take a closer look tomorrow...

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security

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