C++ (Cpp) deventry_mountの例

コード例 #1

ファイル: fs_dev.c プロジェクト: reinerh/firejail

void fs_private_dev(void){
	// install a new /dev directory
	if (arg_debug)
		printf("Mounting tmpfs on /dev\n");

	// create DRI_DIR
	fs_build_mnt_dir();
	
	// keep a copy of dev directory
	if (mkdir(RUN_DEV_DIR, 0755) == -1)
		errExit("mkdir");
	if (chmod(RUN_DEV_DIR, 0755) == -1)
		errExit("chmod");
	ASSERT_PERMS(RUN_DEV_DIR, 0, 0, 0755);
	if (mount("/dev", RUN_DEV_DIR, NULL, MS_BIND|MS_REC, NULL) < 0)
		errExit("mounting /dev/dri");

	// create DEVLOG_FILE
	int have_devlog = 0;
	struct stat s;
	if (stat("/dev/log", &s) == 0) {
		have_devlog = 1;
		FILE *fp = fopen(RUN_DEVLOG_FILE, "w");
		if (!fp)
			have_devlog = 0;
		else {
			fprintf(fp, "\n");
			fclose(fp);
			if (mount("/dev/log", RUN_DEVLOG_FILE, NULL, MS_BIND|MS_REC, NULL) < 0)
				errExit("mounting /dev/log");
		}
	}

	// mount tmpfs on top of /dev
	if (mount("tmpfs", "/dev", "tmpfs", MS_NOSUID | MS_STRICTATIME | MS_REC,  "mode=755,gid=0") < 0)
		errExit("mounting /dev");
	fs_logger("tmpfs /dev");
	
	deventry_mount();

	// bring back /dev/log
	if (have_devlog) {
		FILE *fp = fopen("/dev/log", "w");
		if (fp) {
			fprintf(fp, "\n");
			fclose(fp);
			if (mount(RUN_DEVLOG_FILE, "/dev/log", NULL, MS_BIND|MS_REC, NULL) < 0)
				errExit("mounting /dev/log");
			fs_logger("clone /dev/log");
		}
	}		
	if (mount(RUN_RO_DIR, RUN_DEV_DIR, "none", MS_BIND, "mode=400,gid=0") < 0)
		errExit("disable /dev/snd");

	
	// create /dev/shm
	if (arg_debug)
		printf("Create /dev/shm directory\n");
	if (mkdir("/dev/shm", 01777) == -1)
		errExit("mkdir");
	// mkdir sets only the file permission bits
	if (chmod("/dev/shm", 01777) < 0)
		errExit("chmod");
	ASSERT_PERMS("/dev/shm", 0, 0, 01777);
	fs_logger("mkdir /dev/shm");

	// create devices
	create_char_dev("/dev/zero", 0666, 1, 5); // mknod -m 666 /dev/zero c 1 5
	fs_logger("mknod /dev/zero");
	create_char_dev("/dev/null", 0666, 1, 3); // mknod -m 666 /dev/null c 1 3
	fs_logger("mknod /dev/null");
	create_char_dev("/dev/full", 0666, 1, 7); // mknod -m 666 /dev/full c 1 7
	fs_logger("mknod /dev/full");
	create_char_dev("/dev/random", 0666, 1, 8); // Mknod -m 666 /dev/random c 1 8
	fs_logger("mknod /dev/random");
	create_char_dev("/dev/urandom", 0666, 1, 9); // mknod -m 666 /dev/urandom c 1 9
	fs_logger("mknod /dev/urandom");
	create_char_dev("/dev/tty", 0666,  5, 0); // mknod -m 666 /dev/tty c 5 0
	fs_logger("mknod /dev/tty");
#if 0
	create_dev("/dev/tty0", "mknod -m 666 /dev/tty0 c 4 0");
	create_dev("/dev/console", "mknod -m 622 /dev/console c 5 1");
#endif

	// pseudo-terminal
	if (mkdir("/dev/pts", 0755) == -1)
		errExit("mkdir");
	if (chmod("/dev/pts", 0755) == -1)
		errExit("chmod");
	ASSERT_PERMS("/dev/pts", 0, 0, 0755);
	fs_logger("mkdir /dev/pts");
	create_char_dev("/dev/pts/ptmx", 0666, 5, 2); //"mknod -m 666 /dev/pts/ptmx c 5 2");
	fs_logger("mknod /dev/pts/ptmx");
	create_link("/dev/pts/ptmx", "/dev/ptmx");

// code before github issue #351
	// mount -vt devpts -o newinstance -o ptmxmode=0666 devpts //dev/pts
//	if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL,  "newinstance,ptmxmode=0666") < 0)
//		errExit("mounting /dev/pts");


	// mount /dev/pts
	gid_t ttygid = get_tty_gid();
	char *data;
	if (asprintf(&data, "newinstance,gid=%d,mode=620,ptmxmode=0666", (int) ttygid) == -1)
		errExit("asprintf");
	if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL,  data) < 0)
		errExit("mounting /dev/pts");
	free(data);
	fs_logger("clone /dev/pts");

#if 0
	// stdin, stdout, stderr
	create_link("/proc/self/fd", "/dev/fd");
	create_link("/proc/self/fd/0", "/dev/stdin");
	create_link("/proc/self/fd/1", "/dev/stdout");
	create_link("/proc/self/fd/2", "/dev/stderr");
#endif
}

コード例 #2

ファイル: fs_dev.c プロジェクト: manevich/firejail

void fs_private_dev(void){
	// install a new /dev directory
	if (arg_debug)
		printf("Mounting tmpfs on /dev\n");

	// create DRI_DIR
	// keep a copy of dev directory
	mkdir_attr(RUN_DEV_DIR, 0755, 0, 0);
	if (mount("/dev", RUN_DEV_DIR, NULL, MS_BIND|MS_REC, NULL) < 0)
		errExit("mounting /dev");

	// create DEVLOG_FILE
	int have_devlog = 0;
	struct stat s;
	if (stat("/dev/log", &s) == 0) {
		have_devlog = 1;
		FILE *fp = fopen(RUN_DEVLOG_FILE, "w");
		if (!fp)
			have_devlog = 0;
		else {
			fprintf(fp, "\n");
			fclose(fp);
			if (mount("/dev/log", RUN_DEVLOG_FILE, NULL, MS_BIND|MS_REC, NULL) < 0)
				errExit("mounting /dev/log");
		}
	}

	// mount tmpfs on top of /dev
	if (mount("tmpfs", "/dev", "tmpfs", MS_NOSUID | MS_STRICTATIME | MS_REC,  "mode=755,gid=0") < 0)
		errExit("mounting /dev");
	fs_logger("tmpfs /dev");

	// optional devices: sound, video cards etc...
	deventry_mount();

	// bring back /dev/log
	if (have_devlog) {
		FILE *fp = fopen("/dev/log", "w");
		if (fp) {
			fprintf(fp, "\n");
			fclose(fp);
			if (mount(RUN_DEVLOG_FILE, "/dev/log", NULL, MS_BIND|MS_REC, NULL) < 0)
				errExit("mounting /dev/log");
			fs_logger("clone /dev/log");
		}
	}

	// bring forward the current /dev/shm directory if necessary
	if (arg_debug)
		printf("Process /dev/shm directory\n");
	process_dev_shm();

	if (mount(RUN_RO_DIR, RUN_DEV_DIR, "none", MS_BIND, "mode=400,gid=0") < 0)
		errExit("disable run dev directory");

	// create default devices
	create_char_dev("/dev/zero", 0666, 1, 5); // mknod -m 666 /dev/zero c 1 5
	fs_logger("mknod /dev/zero");
	create_char_dev("/dev/null", 0666, 1, 3); // mknod -m 666 /dev/null c 1 3
	fs_logger("mknod /dev/null");
	create_char_dev("/dev/full", 0666, 1, 7); // mknod -m 666 /dev/full c 1 7
	fs_logger("mknod /dev/full");
	create_char_dev("/dev/random", 0666, 1, 8); // Mknod -m 666 /dev/random c 1 8
	fs_logger("mknod /dev/random");
	create_char_dev("/dev/urandom", 0666, 1, 9); // mknod -m 666 /dev/urandom c 1 9
	fs_logger("mknod /dev/urandom");
	create_char_dev("/dev/tty", 0666,  5, 0); // mknod -m 666 /dev/tty c 5 0
	fs_logger("mknod /dev/tty");
#if 0
	create_dev("/dev/tty0", "mknod -m 666 /dev/tty0 c 4 0");
	create_dev("/dev/console", "mknod -m 622 /dev/console c 5 1");
#endif

	// pseudo-terminal
	mkdir_attr("/dev/pts", 0755, 0, 0);
	fs_logger("mkdir /dev/pts");
	fs_logger("create /dev/pts");
	create_char_dev("/dev/pts/ptmx", 0666, 5, 2); //"mknod -m 666 /dev/pts/ptmx c 5 2");
	fs_logger("mknod /dev/pts/ptmx");
	create_link("/dev/pts/ptmx", "/dev/ptmx");

// code before github issue #351
	// mount -vt devpts -o newinstance -o ptmxmode=0666 devpts //dev/pts
//	if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL,  "newinstance,ptmxmode=0666") < 0)
//		errExit("mounting /dev/pts");


	// mount /dev/pts
	gid_t ttygid = get_group_id("tty");
	char *data;
	if (asprintf(&data, "newinstance,gid=%d,mode=620,ptmxmode=0666", (int) ttygid) == -1)
		errExit("asprintf");
	if (mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL,  data) < 0)
		errExit("mounting /dev/pts");
	free(data);
	fs_logger("clone /dev/pts");

	// stdin, stdout, stderr
#if 0
	create_link("/proc/self/fd", "/dev/fd");
	create_link("/proc/self/fd/0", "/dev/stdin");
	create_link("/proc/self/fd/1", "/dev/stdout");
	create_link("/proc/self/fd/2", "/dev/stderr");
#endif

	// symlinks for DVD/CD players
	if (stat("/dev/sr0", &s) == 0) {
		create_link("/dev/sr0", "/dev/cdrom");
		create_link("/dev/sr0", "/dev/cdrw");
		create_link("/dev/sr0", "/dev/dvd");
		create_link("/dev/sr0", "/dev/dvdrw");
	}
}