Messages in this thread | | | From | Dmitry Vyukov <> | Date | Tue, 13 Dec 2016 10:38:14 +0100 | Subject | Re: [PATCH v2] kasan: Support for r/w instrumentation control |
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On Tue, Dec 13, 2016 at 10:20 AM, Andrey Ryabinin <aryabinin@virtuozzo.com> wrote: > > > On 12/13/2016 11:58 AM, Dmitry Vyukov wrote: > >> --- a/Documentation/dev-tools/kasan.rst >> +++ b/Documentation/dev-tools/kasan.rst >> @@ -40,6 +40,14 @@ similar to the following to the respective kernel Makefile: >> >> KASAN_SANITIZE := n >> >> +Sometimes it may be useful to disable instrumentation of reads, or writes >> +or both for the entire kernel. For example, if binary size is a concern, >> +it may be useful to disable instrumentation of reads to reduce binary size but >> +still catch more harmful bugs on writes. Or, if one is interested only in >> +sanitization of a particular module and performance is a concern, she can >> +disable instrumentation of both reads and writes for kernel code. >> +Instrumentation can be disabled with CONFIG_KASAN_READS and >> CONFIG_KASAN_WRITES. >> + > > I don't understand this. How this can be related to modules? Configs are global. > You can't just disable/enable config per module.
Build everything without instrumentation. Then enable instrumentation and do "make lib/test_kasan.ko". Or build everything, copy out bzImage, change config, build everything again.
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