On Mon, Jul 28, 2014 at 1:25 PM, ji wang <[email protected]> wrote:
> Hi, kcc
>
>>On Linux, you typically have to link the asan run-time to the
>>executable, but see
>>https://code.google.com/p/address-sanitizer/wiki/AsanAsDso
>
> Do we have to use LD_PRELOAD to preload this asan run-time Dso to the
> process before this Asan instrumented executable run?And why?
> I've tried not preload the asan run-time at first, and I got the
Please give more context: where did you try that and what exactly did you do.
> "AddressSanitizer: failed to intercept 'memcpy'" error, And I tried to fix
> it by this modification of the code:
>
> --- a/gcc-4.9/libsanitizer/interception/interception_linux.cc
> +++ b/gcc-4.9/libsanitizer/interception/interception_linux.cc
> @@ -12,13 +12,31 @@
>
> namespace __interception {
> bool GetRealFunctionAddress(const char *func_name, uptr *func_addr,
> uptr real, uptr wrapper) {
> + char *err;
> + void *handle = dlopen("libc.so", RTLD_NOW);
> - *func_addr = (uptr)dlsym(RTLD_NEXT, func_name);
> + *func_addr = (uptr)dlsym(handle, func_name);
> + err = (char *)dlerror();
> + if(err){
> + Printf("---GetRealFunctionAddress: error in dlsym: (%s)\n", err);
> + }
> + dlclose(handle);
>
> return real == wrapper;
> }
> And after this modification, everything went ok. Dose this code modified
> properly? Or have any side effect?
>
>
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