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

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Date:	Mon, 24 Nov 2014 13:45:43 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...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, linux-mm@...ck.org, 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

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:

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
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