#45: Premature thread wake up on successful pam_authenticate call ---------------------+------------------------------ Reporter: igleyy | Owner: pam-developers@… Type: defect | Status: new Priority: major | Component: library Version: | Keywords: Blocked By: | Blocking: ---------------------+------------------------------ For given example code, thread which should sleep for given period of time is prematurely woken up upon successful pam_authenticate call. Environment:[[BR]] Linux Mint 16[[BR]] libpamc.so.0.82.1[[BR]] libpam_misc.so.0.82.0[[BR]] libpam.so.0.83.0[[BR]] g++ (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1[[BR]] Code: {{{ #include <security/pam_appl.h> #include <security/pam_misc.h> #include <pthread.h> #include <iostream> static struct pam_conv conv = { misc_conv, NULL }; void* thread_func(void* foo) { int i = 0; std::cout << "Start thread func stuff " << i++ << std::endl; while (1) { std::cout << "Thread func stuff " << i++ << std::endl; sleep(1000000); } } int main () { pthread_t th; int th_ret; th_ret = pthread_create( &th, NULL, thread_func, (void*) NULL); if (th_ret) { std::cout << "pthread_create failed: " << th_ret << std::endl; exit(1); } pam_handle_t* pamh; struct pam_conv pamc; /* Set up the PAM conversation. */ pamc.conv = &misc_conv; pamc.appdata_ptr = NULL; /* Start a new authentication session. */ pam_start ("passwd", "myusername", &pamc, &pamh); /* Authenticate the user. */ if (pam_authenticate (pamh, 0) != PAM_SUCCESS) std::cout << "Authentication failed!" << std::endl; else std::cout << "Authentication OK" << std::endl; /* All done. */ pam_end (pamh, 0); while(1) {} /* Prevent application finish. */ return 0; } }}} Compiled with {{{ g++ -g pamexample.c -pthread -lpam -lpam_misc }}} For my local user and correct password I get following output: {{{ ./a.out Start thread func stuff 0 Thread func stuff 1 Password: Thread func stuff 2 Thread func stuff 3 Thread func stuff 4 Thread func stuff 5 Thread func stuff 6 Authentication OK }}} For unsuccessful pam_authenticate calls output is correct. Output for given example is correct on SLES 11.3, Ubuntu 14.04. Please let me know if you need more information. -- Ticket URL: <https://fedorahosted.org/linux-pam/ticket/45> linux-pam <http://fedorahosted.org/linux-pam> The Linux-PAM (Pluggable Authentication Modules) project