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diff -up ./src/daemon/fapolicyd.c.already-started ./src/daemon/fapolicyd.c
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--- ./src/daemon/fapolicyd.c.already-started 2023-01-12 17:40:45.366909652 +0100
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+++ ./src/daemon/fapolicyd.c 2023-01-12 17:46:22.458139519 +0100
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@@ -378,6 +378,58 @@ static void usage(void)
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}
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+int already_running(void)
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+{
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+ int pidfd = open(pidfile, O_RDONLY);
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+ if (pidfd >= 0) {
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+ char pid_buf[16];
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+
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+ if (fd_fgets(pid_buf, sizeof(pid_buf), pidfd)) {
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+ int pid;
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+ char exe_buf[80], my_path[80];
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+
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+ // Get our path
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+ if (get_program_from_pid(getpid(),
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+ sizeof(exe_buf), my_path) == NULL)
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+ goto err_out; // shouldn't happen, but be safe
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+
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+ // convert pidfile to integer
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+ errno = 0;
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+ pid = strtoul(pid_buf, NULL, 10);
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+ if (errno)
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+ goto err_out; // shouldn't happen, but be safe
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+
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+ // verify it really is fapolicyd
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+ if (get_program_from_pid(pid,
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+ sizeof(exe_buf), exe_buf) == NULL)
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+ goto good; //if pid doesn't exist, we're OK
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+
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+ // If the path doesn't have fapolicyd in it, we're OK
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+ if (strstr(exe_buf, "fapolicyd") == NULL)
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+ goto good;
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+
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+ if (strcmp(exe_buf, my_path) == 0)
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+ goto err_out; // if the same, we need to exit
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+
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+ // one last sanity check in case path is unexpected
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+ // for example: /sbin/fapolicyd & /home/test/fapolicyd
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+ if (pid != getpid())
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+ goto err_out;
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+good:
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+ close(pidfd);
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+ unlink(pidfile);
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+ return 0;
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+ } else
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+ msg(LOG_ERR, "fapolicyd pid file found but unreadable");
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+err_out: // At this point, we have a pid file, let's just assume it's alive
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+ // because if 2 are running, it deadlocks the machine
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+ close(pidfd);
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+ return 1;
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+ }
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+ return 0; // pid file doesn't exist, we're good to go
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+}
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+
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+
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int main(int argc, const char *argv[])
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{
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struct pollfd pfd[2];
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@@ -428,6 +480,11 @@ int main(int argc, const char *argv[])
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}
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}
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+ if (already_running()) {
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+ msg(LOG_ERR, "fapolicyd is already running");
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+ exit(1);
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+ }
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+
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// Set a couple signal handlers
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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@@ -446,9 +503,6 @@ int main(int argc, const char *argv[])
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setrlimit(RLIMIT_FSIZE, &limit);
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setrlimit(RLIMIT_NOFILE, &limit);
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- // Set strict umask
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- (void) umask( 0117 );
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-
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// get more time slices because everything is waiting on us
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rc = nice(-config.nice_val);
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if (rc == -1)
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@@ -473,17 +527,20 @@ int main(int argc, const char *argv[])
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exit(1);
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}
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- if (preconstruct_fifo(&config)) {
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- msg(LOG_ERR, "Cannot contruct a pipe");
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- exit(1);
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- }
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-
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// Setup filesystem to watch list
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init_fs_list(config.watch_fs);
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// Write the pid file for the init system
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write_pid_file();
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+ // Set strict umask
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+ (void) umask( 0117 );
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+
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+ if (preconstruct_fifo(&config)) {
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+ msg(LOG_ERR, "Cannot contruct a pipe");
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+ exit(1);
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+ }
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+
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// If we are not going to be root, then setup necessary capabilities
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if (config.uid != 0) {
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capng_clear(CAPNG_SELECT_BOTH);
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