Backporting KAsan patches to 4.9 branch

[Jakub Jelinek]

On Tue, Oct 14, 2014 at 03:19:10PM +0400, Dmitry Vyukov wrote:
> > One problem is that for BUILT_IN_ASAN_REPORT_{LOAD,STORE}_N patch I need
> > libsanitizer APIs (__asan_loadN, __asan_storeN) which were introduced in a
> > giant libsanitizer merge in 5.0. In current patchset I backport the whole
> > merge patch (and a bunch of cherry-picks which followed it) but it changes
> > libsanitizer ABI (new version of __asan_init_vXXX, etc.) which is probably
> > undesirable. Another option would be to backport just the necessary minimum
> > (__asan_loadN, __asan_storeN). How should I proceed?
> 
> Backporting only __asan_loadN/__asan_storeN looks like the safest option to me.

That's still an ABI change, libasan is not symbol versioned (perhaps we
should change that).

	Jakub