On Mon, Mar 31, 2014 at 2:28 AM, Yuri Gribov <[email protected]> wrote:
> > We don't have any such plans, but patches are welcome. > > What would be the prerequisites for accepting this patch for upstream? > None, just send a patch. > > > You will need a change in the run-time library and in both compilers. :( > > Yup. I wonder whether my employer will like the fact that I work on > Clang though (we're not using it here). > > > You mean, kasan (Kernel-AddressSanitizer)? > > kasan is just a prototype, it's easier to play with the prototype this > way. > > Eventually it will have inlined checks. > > Ah, so out-of-line checking was done just because it was easier to > implement? Not because you wanted to minimize kernel size? > Correct. Easier to implement and experiment with. > > >> Memory savings would be quite significant which is important for > >> mobile applications. > > > > You mean code size? (of course, it translates into memory usage) > > Yes. > > > I think that outlining the checks will cause dramatic slowdown > > (instead of one load, you access memory 3 times: call > > ... > > ret > > True but branch predictor should be able to cope with these. It would > be crucial to compile static implementation into every executable/DSO > to avoid PLT call costs though. > That will add some more complexity to the build system. E.g. __asan_read1&co will have to reside in a separate library. > > There is also usual cost associated with saving the context > (caller-saved regs, flags, etc.) but this could be minimized if we use > custom ABI for checking builtins (like for arithmetic libgcc > builtins). > --kcc > -Y > > -- > You received this message because you are subscribed to the Google Groups > "address-sanitizer" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "address-sanitizer" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
