<div style="font-family: arial, helvetica, sans-serif"><font size="2"><br><br><div class="gmail_quote">On Mon, Jun 18, 2012 at 5:43 PM, Joerg Sonnenberger <span dir="ltr"><<a href="mailto:joerg@britannica.bec.de" target="_blank">joerg@britannica.bec.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>On Mon, Jun 18, 2012 at 05:19:11PM +0400, Kostya Serebryany wrote:<br>
> On Mon, Jun 18, 2012 at 5:07 PM, Joerg Sonnenberger <<a href="mailto:joerg@britannica.bec.de" target="_blank">joerg@britannica.bec.de</a><br>
> > wrote:<br>
><br>
> > On Mon, Jun 18, 2012 at 02:39:34PM +0400, Kostya Serebryany wrote:<br>
> > > Another difference from Memcheck is that we propose to use 8 shadow bits<br>
> > > per byte of application memory and use a<br>
> > > direct shadow mapping (for 64-bit linux that is just clearing 46-th bit<br>
> > of<br>
> > > the application memory address).<br>
> > > This greatly simplifies the instrumentation code and avoids races on<br>
> > shadow<br>
> > > updates<br>
> > > (Memcheck is single-threaded so races are not a concern there.<br>
> > > Memcheck uses 2 shadow bits per byte with a slow path storage that uses 8<br>
> > > bits per byte).<br>
> ><br>
> > Can you make it possible for ASAN to share the same layout?<br>
><br>
><br>
> Not sure I understand you. What layout?<br>
<br>
</div>Shadow memory.<br></blockquote><div><br></div><div>yes, asan and msan shadow could co-exist, at least on 64-bit linux with disabled ASLR.</div><div>But the problem is that the memory overheads will multiply -- the combined tool will be more expensive to use </div>
<div>than two separate tools together. </div><div><br></div><div>--kcc </div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div><br>
Joerg<br>
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