linux-kernel - Re: [PATCH v7 03/12] x86

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Date:	Tue, 25 Nov 2014 14:47:27 +0400
From:	Dmitry Chernenkov <dmitryc@...gle.com>
To:	Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Jones <davej@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v7 03/12] x86_64: add KASan support

LGTM.

Also, please send a pull request to google/kasan whenever you're ready
(for the whole bulk of changes).



On Tue, Nov 25, 2014 at 12:26 AM, Andrey Ryabinin
<ryabinin.a.a@...il.com> wrote:
> 2014-11-24 21:45 GMT+03:00 Sasha Levin <sasha.levin@...cle.com>:
>> On 11/24/2014 01:02 PM, Andrey Ryabinin wrote:
>>> +static int kasan_die_handler(struct notifier_block *self,
>>> +                          unsigned long val,
>>> +                          void *data)
>>> +{
>>> +     if (val == DIE_GPF) {
>>> +             pr_emerg("CONFIG_KASAN_INLINE enabled\n");
>>> +             pr_emerg("GPF could be caused by NULL-ptr deref or user memory access\n");
>>> +     }
>>> +     return NOTIFY_OK;
>>> +}
>>> +
>>> +static struct notifier_block kasan_die_notifier = {
>>> +     .notifier_call = kasan_die_handler,
>>> +};
>>
>> This part fails to compile:
>>
>>   CC      arch/x86/mm/kasan_init_64.o
>> arch/x86/mm/kasan_init_64.c: In function ‘kasan_die_handler’:
>> arch/x86/mm/kasan_init_64.c:72:13: error: ‘DIE_GPF’ undeclared (first use in this function)
>>   if (val == DIE_GPF) {
>>              ^
>> arch/x86/mm/kasan_init_64.c:72:13: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/mm/kasan_init_64.c: In function ‘kasan_init’:
>> arch/x86/mm/kasan_init_64.c:89:2: error: implicit declaration of function ‘register_die_notifier’ [-Werror=implicit-function-declaration]
>>   register_die_notifier(&kasan_die_notifier);
>>   ^
>> cc1: some warnings being treated as errors
>> make[1]: *** [arch/x86/mm/kasan_init_64.o] Error 1
>>
>>
>> Simple fix:
>>
>
> Thanks, I thought I've fixed this, but apparently I forgot to commit it.
>
>
>> diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
>> index 70041fd..c8f7f3e 100644
>> --- a/arch/x86/mm/kasan_init_64.c
>> +++ b/arch/x86/mm/kasan_init_64.c
>> @@ -5,6 +5,7 @@
>>  #include <linux/vmalloc.h>
>>
>>  #include <asm/tlbflush.h>
>> +#include <linux/kdebug.h>
>>
>>  extern pgd_t early_level4_pgt[PTRS_PER_PGD];
>>  extern struct range pfn_mapped[E820_X_MAX];
>>
>>
>> Thanks,
>> Sasha
>>
>
> --
> Best regards,
> Andrey Ryabinin
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