mirror of
https://gitlab.com/libvirt/libvirt.git
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154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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/*
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* When libvirt initializes, it creates a thread local for storing
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* the last virErrorPtr instance. It also registers a cleanup
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* callback for the thread local that will be invoked whenever
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* a thread exits.
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*
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* If the libvirt.so library was dlopen()'d and is dlclose()'d
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* while there is still a thread present, then when that thread
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* later exits, the libvirt cleanup callback will be invoked.
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* Unfortunately libvirt.so will no longer be in memory so the
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* callback SEGVs (if you're lucky), or invokes unlreated
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* code at the same address as the old callback (if you're
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* unlucky).
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*
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* To fix the problem libvirt is linked '-z nodelete' which
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* prevents the code being removed from memory at dlclose().
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*
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* This test case demonstrates this SEGV scenario. If this
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* test does not SEGV, then the '-z nodelete' fix is working
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*/
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#include <config.h>
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#include "testutils.h"
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#ifdef linux
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# include <dlfcn.h>
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# include <pthread.h>
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# include <stdbool.h>
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# include <stdio.h>
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# include <unistd.h>
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# include <signal.h>
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# include "internal.h"
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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bool running = false;
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bool quit = false;
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static void *threadMain(void *arg)
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{
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void (*startup)(void) = arg;
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startup();
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pthread_mutex_lock(&lock);
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running = true;
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pthread_cond_signal(&cond);
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while (!quit) {
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pthread_cond_wait(&cond, &lock);
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}
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pthread_mutex_unlock(&lock);
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return NULL;
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}
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static void sigHandler(int sig)
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{
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ignore_value(write(STDERR_FILENO, "FAIL\n", 5));
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signal(sig, SIG_DFL);
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raise(sig);
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}
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/* We're not using the testutils.c main() wrapper because
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* we don't want 'shunloadtest' itself to link against
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* libvirt.so. We need to test dlopen()'ing of libvirt.so
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*/
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int main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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void (*startup)(void);
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pthread_t t;
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void *lib;
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char *theprogname;
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theprogname = argv[0];
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if (STRPREFIX(theprogname, "./"))
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theprogname += 2;
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fprintf(stderr, "TEST: %s\n", theprogname);
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fprintf(stderr, " .%*s 1 ", 39, "");
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signal(SIGSEGV, sigHandler);
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if (!(lib = dlopen("./.libs/libshunload.so", RTLD_LAZY))) {
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fprintf(stderr, "Cannot load ./.libs/libshunload.so %s\n", dlerror());
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return 1;
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}
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if (!(startup = dlsym(lib, "shunloadStart"))) {
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fprintf(stderr, "Cannot find shunloadStart %s\n", dlerror());
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return 1;
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}
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/*
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* Create a thread which is going to initialize libvirt
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* and raise an error
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*/
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pthread_create(&t, NULL, threadMain, startup);
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/* Wait for the thread to start and call libvirt */
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pthread_mutex_lock(&lock);
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while (!running) {
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pthread_cond_wait(&cond, &lock);
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}
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/* Close the shared library (and thus make libvirt.so
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* non-resident */
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dlclose(lib);
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/* Tell the thread to quit */
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quit = true;
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pthread_cond_signal(&cond);
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pthread_mutex_unlock(&lock);
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pthread_join(t, NULL);
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/* If we got to here the thread successfully exited without
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* causing a SEGV !
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*/
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fprintf(stderr, "OK\n");
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return 0;
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}
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#else
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int main(void)
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{
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return EXIT_AM_SKIP;
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}
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#endif
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