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Message-ID: <53C08876.10209@zytor.com> Date: Fri, 11 Jul 2014 17:59:34 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Andrey Ryabinin <a.ryabinin@...sung.com>, linux-kernel@...r.kernel.org CC: Dmitry Vyukov <dvyukov@...gle.com>, Konstantin Serebryany <kcc@...gle.com>, Alexey Preobrazhensky <preobr@...gle.com>, Andrey Konovalov <adech.fo@...il.com>, Yuri Gribov <tetra2005@...il.com>, Konstantin Khlebnikov <koct9i@...il.com>, Sasha Levin <sasha.levin@...cle.com>, Michal Marek <mmarek@...e.cz>, Russell King <linux@....linux.org.uk>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, x86@...nel.org, linux-mm@...ck.org Subject: Re: [RFC/PATCH -next 00/21] Address sanitizer for kernel (kasan) - dynamic memory error detector. On 07/09/2014 04:00 AM, Andrey Ryabinin wrote: > > Address sanitizer dedicates 1/8 of the low memory to the shadow memory and uses direct > mapping with a scale and offset to translate a memory address to its corresponding > shadow address. > > Here is function to translate address to corresponding shadow address: > > unsigned long kasan_mem_to_shadow(unsigned long addr) > { > return ((addr) >> KASAN_SHADOW_SCALE_SHIFT) > + kasan_shadow_start - (PAGE_OFFSET >> KASAN_SHADOW_SCALE_SHIFT); > } > > where KASAN_SHADOW_SCALE_SHIFT = 3. > How does that work when memory is sparsely populated? -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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