From: Andrey Ryabinin <a.ryabinin@samsung.com>
To: Christoph Lameter <cl@gentwo.org>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
Konstantin Serebryany <kcc@google.com>,
Alexey Preobrazhensky <preobr@google.com>,
Andrey Konovalov <adech.fo@gmail.com>,
Yuri Gribov <tetra2005@gmail.com>,
Konstantin Khlebnikov <koct9i@gmail.com>,
Sasha Levin <sasha.levin@oracle.com>,
Michal Marek <mmarek@suse.cz>,
Russell King <linux@arm.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kbuild@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, x86@kernel.org,
linux-mm@kvack.org
Subject: Re: [RFC/PATCH -next 00/21] Address sanitizer for kernel (kasan) - dynamic memory error detector.
Date: Tue, 15 Jul 2014 18:32:23 +0400 [thread overview]
Message-ID: <53C53B77.3080000@samsung.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1407141012520.25405@gentwo.org>
On 07/14/14 19:13, Christoph Lameter wrote:
> On Sun, 13 Jul 2014, Andrey Ryabinin wrote:
>
>>> How does that work when memory is sparsely populated?
>>>
>>
>> Sparsemem configurations currently may not work with kasan.
>> I suppose I will have to move shadow area to vmalloc address space and
>> make it (shadow) sparse too if needed.
>
> Well it seems to work with sparsemem / vmemmap? So non vmmemmapped configs
> of sparsemem only. vmemmmap can also handle holes in memory.
>
>
Not sure. This sparsemem/vmemmap thing is kinda new to me, so I need to dig some more
to understand how it iN?teracts with kasan.
As far as I understand the main problem with sparsemem & kasan is shadow allocation:
unsigned long lowmem_size = (unsigned long)high_memory - PAGE_OFFSET;
shadow_size = lowmem_size >> KASAN_SHADOW_SCALE_SHIFT;
shadow_phys_start = memblock_alloc(shadow_size, PAGE_SIZE);
If we don't have one big enough physically contiguous block for shadow it will fail.
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prev parent reply other threads:[~2014-07-15 14:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-09 11:00 Andrey Ryabinin
2014-07-12 0:59 ` H. Peter Anvin
2014-07-13 10:39 ` Andrey Ryabinin
2014-07-14 15:13 ` Christoph Lameter
2014-07-15 14:32 ` Andrey Ryabinin [this message]
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