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Re: [PATCH 3/3] [asan] Instrument built-in memory access function calls
Jakub Jelinek <jakub@redhat.com> writes:
> On Wed, Oct 24, 2012 at 05:16:26PM +0200, Dodji Seketeli wrote:
>> Jakub Jelinek <jakub@redhat.com> writes:
>>
>> >> For 'strlen', can the memory check be done at the end of the string
>> >> using the returned length?
>> >
>> > Guess strlen is commonly expanded inline, so it would be worthwhile to check
>> > the shadow memory after the call (well, we could check the first byte
>> > before the call and the last one after the call).
>>
>> How do I get the result of the (strlen) call in gimple?
>
> That is gimple_call_lhs (call_stmt).
OK, thank you.
> So for insturmenting strlen, you want to ammend:
> tmp = strlen (ptr);
> as
> asan_addr_check (ptr);
> tmp = strlen (ptr);
> asan_addr_check (ptr + tmp);
I see, thanks.
--
Dodji