On Fri, Dec 2, 2016 at 6:35 AM, Maxim Ostapenko <chefm...@gmail.com> wrote:
> Hi,
> 02 Дек 2016 г. 7:30 пользователь "steven shi" <shijunj...@gmail.com>
> написал:
>> Hello,
>> With the experts' help in this community, I've enabled the Asan for global
>> and stack buffer in my bare-mental platform firmware, thanks a lot.
>> But I find the current Asan doesn't support to protect the structure inner
>> elements, E.g. the global_array[11] in below code. Unfortunately, most of
>> important data are defined through structure in my firmware, and if the Asan
>> doesn't support to protect structure inner elements, most of my data memory
>> access will not be protected by Asan. So, could we let Asan support
>> structure inner elements?
>> Well, I understand it is not safe to just instrument red-zone between
>> structure inner elements like current Asan does on global variable.  We also
>> need to handle the sizeof(), offsetof() macro, the alignment pragma, and
>> maybe others. Could we extend Asan scope beyond IR to Clang front-end to do
>> some source-to-source conversion to handle these issue? E.g. for no
>> alignment enforced structure,  replace the structure inner elements with
>> red-zone instrumented version, and let the sizeof() be-aware of the size
>> change. Is it possible?
> Won't this break separate sanitization? E.g. if I have libfoo.so that has
> struct Foo as part of its ABI and I want to test it with ASan, I'll need to
> recompile not only libfoo.so, but all dependent libraries too to make sure
> they caught up the changed layout of struct Foo. This sounds like a bad idea
> for me.
> Or maybe I've just missed something?

I think Steven's code is self-contained so he does not care. Also note
that you can get away without breaking ABI but just poisoning natural
padding in structures. I guess the main problem with sanitizing
structs is that they are often passed to "low-level"
memcmp/memcpy/memset/etc. functions which would result in spurious

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