mprotect regions made with dlopen

[kung foo man]

[20:53] php: do u know how to mprotect regions made with dlopen

		int unprotect_lib(char *libname)
{
    char buf[512];
    char flags[4];
    void *low, *high;
    FILE *fp;
    fp = fopen("/proc/self/maps", "r");
    if ( ! fp)
        return 0;
    while (fgets(buf, sizeof(buf), fp))
    {
        if ( ! strstr(buf, libname))
            continue;
        if (sscanf (buf, "%p-%p %4c", &low, &high, flags) != 3)
            continue;
        //printf(buf);
        //printf("%08x %08x diff:%.8p\n", low, high, (int)high-(int)low);
        mprotect((void *)low, (int)high-(int)low, PROT_READ | PROT_WRITE | PROT_EXEC);
    }
    fclose(fp);
    return 1;
} 
	

For dlopen("bla") it should be unprotect_lib("bla");

You can look in /proc/self/maps or /proc/$pid/maps for the actual loaded maps at runtime.

[php]

Thanks for this, maybe it'll help someone else too.