[Valgrind-users] [HELP] I run the valgrind in the unreleased android version(arm32), I am confused by function stack. Can you show me why?

[Wuweijia <wuw...@hu...>]

HI
            Why I call the strcmp, but function stack show that the strcat is  called not the strcmp, but the file is belong to the function strcmp

            Can you show the how to replace the strcmp with "STRCMP(VG_Z_LIBC_SONAME,          strcmp)", and then  I can follow the code to find out why.

            I can find the code you set the LD_PRELOAD ,  but symbol name  is not match,  I do not know how you replace the strcmp with STRCMP(VG_Z_LIBC_SONAME,          strcmp).

            Can  you help to point out the function do the job replace the strcmp with STRCMP(VG_Z_LIBC_SONAME,          strcmp)",


Valgrind 3.12.
CPU:arm

The source as below:
#include <errno.h>
#include <limits.h>
#include <stdatomic.h>
#include <string.h>
#include <sys/cdefs.h>
#include <sys/mman.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>


_Atomic(unsigned int ) g_status;


int main(int argc __unused , char ** argv __unused ) {
        unsigned int init = 1;
        int flag = 1;
        unsigned int expect = random();
        unsigned int value = 2;
        atomic_init(&g_status, init);

        if (__predict_true(atomic_compare_exchange_strong_explicit(&g_status, &expect,
                             value, memory_order_acquire, memory_order_relaxed))) {
            flag = 0;
        }

        printf("Done  flag:%d cmp:%d \n", flag, strcmp("aaaa", "cccc") ); ---------this line is number 27
        return  1;
}


Valgrind show me output :
==30141== Invalid write of size 4
==30141==    at 0x4C27CAE: strcat (strcmp.c:3)
==30141==    by 0x108871: main (testClang.c:27)
==30141==  Address 0xfeb445bc is on thread 1's stack
==30141==  12 bytes below stack pointer

BR
Owen