Re: [sr-dev] [kamailio/kamailio] Regression on app_lua after ASLR enable on FreeBSD (Issue #3202)

@henningw, the problem could appears not only on FreeBSD environment, but on any ASLR environment. I've wrote a test case for the regression close to Kamailio behavior: _libtest.c_: ```c #include "modules.h" static char *str= "app_lua"; int mod_register() { modules_add(str); return 0; } ``` _modules.c_: ```c #include <stdio.h> void modules_add(char *msg) { printf("modules_add(%p): %s\n", msg, msg); } ``` _main.c_: ```c #include <stdio.h> #include <dlfcn.h> #include "modules.h" typedef int (*mod_register_function)(); int testlib(int num) { mod_register_function mr; char* error; void* h = dlopen("libtest.so", RTLD_NOW); if (h == 0) { printf("Error loading\n"); return 1; } dlerror(); mr = (mod_register_function)dlsym(h, "mod_register"); if ((error = (char*)dlerror()) != 0) { printf("dlsym error: %s\n", error); return 1; } printf("Call mod_register() #%d: ", num); mr(); dlclose(h); return 0; } int main() { int err; err = testlib(1); if (err != 0) return err; err = testlib(2); if (err != 0) return err; return 0; } ``` And ran it on non-ASLR and ASLR environment: _non-ASLR_: ``` boris@boris:~/aslr_test% ./aslr_test Call mod_register() #1: modules_add(0x800646528): app_lua Call mod_register() #2: modules_add(0x800646528): app_lua ``` _ASLR_: ``` boris@boris:~/aslr_test% ./aslr_test Call mod_register() #1: modules_add(0x825abc528): app_lua Call mod_register() #2: modules_add(0x825bfe528): app_lua ``` And how can we see: `str` address is changed on ASLR environment, and we cannot use it after reloading library. I suppose using static variable after reloading library is incorrect way. -- Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/3202#issuecomment-1204917683 You are receiving this because you are subscribed to this thread. Message ID: &lt;kamailio/kamailio/issues/3202/1204917683(a)github.com&gt;