core: move several source files to src/shared
As, the files are used by many executables, fstab-generator, remount-fs, machine-id-setup, and etc. With this change, the total size of the relevant executables and libshared slightly decreases. Before: ``` $ ll systemd-fstab-generator systemd-remount-fs systemd-machine-id-setup systemd-shutdown systemd-nspawn systemd src/shared/libsystemd-shared-247.so -rwxrwxr-x 1 watanabe watanabe 7577800 Jan 5 13:35 src/shared/libsystemd-shared-247.so -rwxrwxr-x 1 watanabe watanabe 4608360 Jan 5 13:35 systemd -rwxrwxr-x 1 watanabe watanabe 117240 Jan 5 13:35 systemd-fstab-generator -rwxrwxr-x 1 watanabe watanabe 61576 Jan 5 13:35 systemd-machine-id-setup -rwxrwxr-x 1 watanabe watanabe 853080 Jan 5 13:35 systemd-nspawn -rwxrwxr-x 1 watanabe watanabe 70600 Jan 5 13:35 systemd-remount-fs -rwxrwxr-x 1 watanabe watanabe 172624 Jan 5 13:35 systemd-shutdown ``` Total: 13461280 After: ``` $ ll systemd-fstab-generator systemd-remount-fs systemd-machine-id-setup systemd-shutdown systemd-nspawn systemd src/shared/libsystemd-shared-247.so -rwxrwxr-x 1 watanabe watanabe 7658336 Jan 5 13:32 src/shared/libsystemd-shared-247.so -rwxrwxr-x 1 watanabe watanabe 4523560 Jan 5 13:32 systemd -rwxrwxr-x 1 watanabe watanabe 78288 Jan 5 13:32 systemd-fstab-generator -rwxrwxr-x 1 watanabe watanabe 30984 Jan 5 13:32 systemd-machine-id-setup -rwxrwxr-x 1 watanabe watanabe 840384 Jan 5 13:32 systemd-nspawn -rwxrwxr-x 1 watanabe watanabe 39104 Jan 5 13:32 systemd-remount-fs -rwxrwxr-x 1 watanabe watanabe 117160 Jan 5 13:32 systemd-shutdown ``` Total: 13287816
This commit is contained in:
Yu Watanabe
@@ -0,0 +1,283 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
||||
/***
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Copyright © 2010 ProFUSION embedded systems
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***/
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#include <errno.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "def.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "format-util.h"
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#include "killall.h"
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#include "parse-util.h"
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#include "process-util.h"
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#include "set.h"
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#include "string-util.h"
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#include "terminal-util.h"
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#include "util.h"
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static bool ignore_proc(pid_t pid, bool warn_rootfs) {
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_cleanup_fclose_ FILE *f = NULL;
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const char *p;
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char c = 0;
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uid_t uid;
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int r;
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/* We are PID 1, let's not commit suicide */
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if (pid <= 1)
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return true;
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/* Ignore kernel threads */
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r = is_kernel_thread(pid);
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if (r != 0)
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return true; /* also ignore processes where we can't determine this */
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r = get_process_uid(pid, &uid);
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if (r < 0)
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return true; /* not really, but better safe than sorry */
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/* Non-root processes otherwise are always subject to be killed */
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if (uid != 0)
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return false;
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p = procfs_file_alloca(pid, "cmdline");
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f = fopen(p, "re");
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if (!f)
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return true; /* not really, but has the desired effect */
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/* Try to read the first character of the command line. If the cmdline is empty (which might be the case for
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* kernel threads but potentially also other stuff), this line won't do anything, but we don't care much, as
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* actual kernel threads are already filtered out above. */
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(void) fread(&c, 1, 1, f);
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/* Processes with argv[0][0] = '@' we ignore from the killing spree.
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*
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* https://systemd.io/ROOT_STORAGE_DAEMONS */
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if (c != '@')
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return false;
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if (warn_rootfs &&
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pid_from_same_root_fs(pid) == 0) {
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_cleanup_free_ char *comm = NULL;
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(void) get_process_comm(pid, &comm);
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log_notice("Process " PID_FMT " (%s) has been marked to be excluded from killing. It is "
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"running from the root file system, and thus likely to block re-mounting of the "
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"root file system to read-only. Please consider moving it into an initrd file "
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"system instead.", pid, strna(comm));
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}
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return true;
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}
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static void log_children_no_yet_killed(Set *pids) {
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_cleanup_free_ char *lst_child = NULL;
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void *p;
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SET_FOREACH(p, pids) {
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_cleanup_free_ char *s = NULL;
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if (get_process_comm(PTR_TO_PID(p), &s) < 0)
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(void) asprintf(&s, PID_FMT, PTR_TO_PID(p));
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if (!strextend(&lst_child, ", ", s)) {
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log_oom();
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return;
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}
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}
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if (isempty(lst_child))
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return;
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log_warning("Waiting for process: %s", lst_child + 2);
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}
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static int wait_for_children(Set *pids, sigset_t *mask, usec_t timeout) {
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usec_t until, date_log_child, n;
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assert(mask);
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/* Return the number of children remaining in the pids set: That correspond to the number
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* of processes still "alive" after the timeout */
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if (set_isempty(pids))
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return 0;
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n = now(CLOCK_MONOTONIC);
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until = usec_add(n, timeout);
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date_log_child = usec_add(n, 10u * USEC_PER_SEC);
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if (date_log_child > until)
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date_log_child = usec_add(n, timeout / 2u);
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for (;;) {
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struct timespec ts;
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int k;
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void *p;
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/* First, let the kernel inform us about killed
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* children. Most processes will probably be our
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* children, but some are not (might be our
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* grandchildren instead...). */
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for (;;) {
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pid_t pid;
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pid = waitpid(-1, NULL, WNOHANG);
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if (pid == 0)
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break;
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if (pid < 0) {
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if (errno == ECHILD)
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break;
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return log_error_errno(errno, "waitpid() failed: %m");
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}
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(void) set_remove(pids, PID_TO_PTR(pid));
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}
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/* Now explicitly check who might be remaining, who
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* might not be our child. */
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SET_FOREACH(p, pids) {
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/* kill(pid, 0) sends no signal, but it tells
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* us whether the process still exists. */
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if (kill(PTR_TO_PID(p), 0) == 0)
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continue;
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if (errno != ESRCH)
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continue;
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set_remove(pids, p);
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}
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if (set_isempty(pids))
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return 0;
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n = now(CLOCK_MONOTONIC);
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if (date_log_child > 0 && n >= date_log_child) {
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log_children_no_yet_killed(pids);
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/* Log the children not yet killed only once */
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date_log_child = 0;
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}
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if (n >= until)
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return set_size(pids);
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if (date_log_child > 0)
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timespec_store(&ts, MIN(until - n, date_log_child - n));
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else
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timespec_store(&ts, until - n);
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k = sigtimedwait(mask, NULL, &ts);
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if (k != SIGCHLD) {
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if (k < 0 && errno != EAGAIN)
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return log_error_errno(errno, "sigtimedwait() failed: %m");
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if (k >= 0)
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log_warning("sigtimedwait() returned unexpected signal.");
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}
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}
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}
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static int killall(int sig, Set *pids, bool send_sighup) {
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *d;
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int n_killed = 0;
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/* Send the specified signal to all remaining processes, if not excluded by ignore_proc().
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* Returns the number of processes to which the specified signal was sent */
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dir = opendir("/proc");
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if (!dir)
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return log_warning_errno(errno, "opendir(/proc) failed: %m");
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FOREACH_DIRENT_ALL(d, dir, break) {
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pid_t pid;
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int r;
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if (!IN_SET(d->d_type, DT_DIR, DT_UNKNOWN))
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continue;
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if (parse_pid(d->d_name, &pid) < 0)
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continue;
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if (ignore_proc(pid, sig == SIGKILL && !in_initrd()))
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continue;
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if (sig == SIGKILL) {
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_cleanup_free_ char *s = NULL;
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(void) get_process_comm(pid, &s);
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log_notice("Sending SIGKILL to PID "PID_FMT" (%s).", pid, strna(s));
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}
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if (kill(pid, sig) >= 0) {
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n_killed++;
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if (pids) {
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r = set_put(pids, PID_TO_PTR(pid));
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if (r < 0)
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log_oom();
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}
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} else if (errno != ENOENT)
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log_warning_errno(errno, "Could not kill %d: %m", pid);
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if (send_sighup) {
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/* Optionally, also send a SIGHUP signal, but
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only if the process has a controlling
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tty. This is useful to allow handling of
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shells which ignore SIGTERM but react to
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SIGHUP. We do not send this to processes that
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have no controlling TTY since we don't want to
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trigger reloads of daemon processes. Also we
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make sure to only send this after SIGTERM so
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that SIGTERM is always first in the queue. */
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if (get_ctty_devnr(pid, NULL) >= 0)
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/* it's OK if the process is gone, just ignore the result */
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(void) kill(pid, SIGHUP);
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}
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}
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return n_killed;
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}
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int broadcast_signal(int sig, bool wait_for_exit, bool send_sighup, usec_t timeout) {
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int n_children_left;
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sigset_t mask, oldmask;
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_cleanup_set_free_ Set *pids = NULL;
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/* Send the specified signal to all remaining processes, if not excluded by ignore_proc().
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* Return:
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* - The number of processes still "alive" after the timeout (that should have been killed)
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* if the function needs to wait for the end of the processes (wait_for_exit).
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* - Otherwise, the number of processes to which the specified signal was sent */
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if (wait_for_exit)
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pids = set_new(NULL);
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assert_se(sigemptyset(&mask) == 0);
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assert_se(sigaddset(&mask, SIGCHLD) == 0);
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assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
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if (kill(-1, SIGSTOP) < 0 && errno != ESRCH)
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log_warning_errno(errno, "kill(-1, SIGSTOP) failed: %m");
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n_children_left = killall(sig, pids, send_sighup);
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if (kill(-1, SIGCONT) < 0 && errno != ESRCH)
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log_warning_errno(errno, "kill(-1, SIGCONT) failed: %m");
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if (wait_for_exit && n_children_left > 0)
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n_children_left = wait_for_children(pids, &mask, timeout);
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assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
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return n_children_left;
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}
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@@ -0,0 +1,6 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "time-util.h"
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int broadcast_signal(int sig, bool wait_for_exit, bool send_sighup, usec_t timeout);
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@@ -0,0 +1,213 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <net/if.h>
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#include <stdlib.h>
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#include "sd-netlink.h"
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#include "loopback-setup.h"
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#include "missing_network.h"
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#include "netlink-util.h"
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#include "time-util.h"
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#define LOOPBACK_SETUP_TIMEOUT_USEC (5 * USEC_PER_SEC)
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struct state {
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unsigned n_messages;
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int rcode;
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const char *error_message;
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const char *success_message;
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};
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static int generic_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
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struct state *s = userdata;
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int r;
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assert(s);
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assert(s->n_messages > 0);
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s->n_messages--;
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|
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errno = 0;
|
||||
|
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r = sd_netlink_message_get_errno(m);
|
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if (r < 0)
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log_debug_errno(r, "%s: %m", s->error_message);
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else
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log_debug("%s", s->success_message);
|
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|
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s->rcode = r;
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return 0;
|
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}
|
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|
||||
static int start_loopback(sd_netlink *rtnl, struct state *s) {
|
||||
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
|
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int r;
|
||||
|
||||
assert(rtnl);
|
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assert(s);
|
||||
|
||||
r = sd_rtnl_message_new_link(rtnl, &req, RTM_SETLINK, LOOPBACK_IFINDEX);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_netlink_call_async(rtnl, NULL, req, generic_handler, NULL, s, LOOPBACK_SETUP_TIMEOUT_USEC, "systemd-start-loopback");
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
s->n_messages ++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int add_ipv4_address(sd_netlink *rtnl, struct state *s) {
|
||||
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
|
||||
int r;
|
||||
|
||||
assert(rtnl);
|
||||
assert(s);
|
||||
|
||||
r = sd_rtnl_message_new_addr(rtnl, &req, RTM_NEWADDR, LOOPBACK_IFINDEX, AF_INET);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_rtnl_message_addr_set_prefixlen(req, 8);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_rtnl_message_addr_set_flags(req, IFA_F_PERMANENT);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_rtnl_message_addr_set_scope(req, RT_SCOPE_HOST);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &(struct in_addr) { .s_addr = htobe32(INADDR_LOOPBACK) } );
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_netlink_call_async(rtnl, NULL, req, generic_handler, NULL, s, USEC_INFINITY, "systemd-loopback-ipv4");
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
s->n_messages ++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int add_ipv6_address(sd_netlink *rtnl, struct state *s) {
|
||||
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
|
||||
int r;
|
||||
|
||||
assert(rtnl);
|
||||
assert(s);
|
||||
|
||||
r = sd_rtnl_message_new_addr(rtnl, &req, RTM_NEWADDR, LOOPBACK_IFINDEX, AF_INET6);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_rtnl_message_addr_set_prefixlen(req, 128);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_rtnl_message_addr_set_flags(req, IFA_F_PERMANENT);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_rtnl_message_addr_set_scope(req, RT_SCOPE_HOST);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &in6addr_loopback);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = sd_netlink_call_async(rtnl, NULL, req, generic_handler, NULL, s, USEC_INFINITY, "systemd-loopback-ipv6");
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
s->n_messages ++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool check_loopback(sd_netlink *rtnl) {
|
||||
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
|
||||
unsigned flags;
|
||||
int r;
|
||||
|
||||
r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, LOOPBACK_IFINDEX);
|
||||
if (r < 0)
|
||||
return false;
|
||||
|
||||
r = sd_netlink_call(rtnl, req, USEC_INFINITY, &reply);
|
||||
if (r < 0)
|
||||
return false;
|
||||
|
||||
r = sd_rtnl_message_link_get_flags(reply, &flags);
|
||||
if (r < 0)
|
||||
return false;
|
||||
|
||||
return flags & IFF_UP;
|
||||
}
|
||||
|
||||
int loopback_setup(void) {
|
||||
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
|
||||
struct state state_4 = {
|
||||
.error_message = "Failed to add address 127.0.0.1 to loopback interface",
|
||||
.success_message = "Successfully added address 127.0.0.1 to loopback interface",
|
||||
}, state_6 = {
|
||||
.error_message = "Failed to add address ::1 to loopback interface",
|
||||
.success_message = "Successfully added address ::1 to loopback interface",
|
||||
}, state_up = {
|
||||
.error_message = "Failed to bring loopback interface up",
|
||||
.success_message = "Successfully brought loopback interface up",
|
||||
};
|
||||
int r;
|
||||
|
||||
r = sd_netlink_open(&rtnl);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to open netlink: %m");
|
||||
|
||||
/* Note that we add the IP addresses here explicitly even though the kernel does that too implicitly when
|
||||
* setting up the loopback device. The reason we do this here a second time (and possibly race against the
|
||||
* kernel) is that we want to synchronously wait until the IP addresses are set up correctly, see
|
||||
*
|
||||
* https://github.com/systemd/systemd/issues/5641 */
|
||||
|
||||
r = add_ipv4_address(rtnl, &state_4);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to enqueue IPv4 loopback address add request: %m");
|
||||
|
||||
r = add_ipv6_address(rtnl, &state_6);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to enqueue IPv6 loopback address add request: %m");
|
||||
|
||||
r = start_loopback(rtnl, &state_up);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to enqueue loopback interface start request: %m");
|
||||
|
||||
while (state_4.n_messages + state_6.n_messages + state_up.n_messages > 0) {
|
||||
r = sd_netlink_wait(rtnl, LOOPBACK_SETUP_TIMEOUT_USEC);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to wait for netlink event: %m");
|
||||
|
||||
r = sd_netlink_process(rtnl, NULL);
|
||||
if (r < 0)
|
||||
return log_warning_errno(r, "Failed to process netlink event: %m");
|
||||
}
|
||||
|
||||
/* Note that we don't really care whether the addresses could be added or not */
|
||||
if (state_up.rcode != 0) {
|
||||
/* If we lack the permissions to configure the loopback device,
|
||||
* but we find it to be already configured, let's exit cleanly,
|
||||
* in order to supported unprivileged containers. */
|
||||
if (state_up.rcode == -EPERM && check_loopback(rtnl))
|
||||
return 0;
|
||||
|
||||
return log_warning_errno(state_up.rcode, "Failed to configure loopback device: %m");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,4 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
||||
#pragma once
|
||||
|
||||
int loopback_setup(void);
|
||||
@@ -0,0 +1,282 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
||||
|
||||
#include <fcntl.h>
|
||||
#include <sched.h>
|
||||
#include <sys/mount.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include "sd-id128.h"
|
||||
|
||||
#include "alloc-util.h"
|
||||
#include "fd-util.h"
|
||||
#include "fs-util.h"
|
||||
#include "id128-util.h"
|
||||
#include "io-util.h"
|
||||
#include "log.h"
|
||||
#include "machine-id-setup.h"
|
||||
#include "macro.h"
|
||||
#include "mkdir.h"
|
||||
#include "mount-util.h"
|
||||
#include "mountpoint-util.h"
|
||||
#include "namespace-util.h"
|
||||
#include "path-util.h"
|
||||
#include "process-util.h"
|
||||
#include "stat-util.h"
|
||||
#include "string-util.h"
|
||||
#include "umask-util.h"
|
||||
#include "util.h"
|
||||
#include "virt.h"
|
||||
|
||||
static int generate_machine_id(const char *root, sd_id128_t *ret) {
|
||||
const char *dbus_machine_id;
|
||||
_cleanup_close_ int fd = -1;
|
||||
int r;
|
||||
|
||||
assert(ret);
|
||||
|
||||
/* First, try reading the D-Bus machine id, unless it is a symlink */
|
||||
dbus_machine_id = prefix_roota(root, "/var/lib/dbus/machine-id");
|
||||
fd = open(dbus_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
|
||||
if (fd >= 0) {
|
||||
if (id128_read_fd(fd, ID128_PLAIN, ret) >= 0) {
|
||||
log_info("Initializing machine ID from D-Bus machine ID.");
|
||||
return 0;
|
||||
}
|
||||
|
||||
fd = safe_close(fd);
|
||||
}
|
||||
|
||||
if (isempty(root) && running_in_chroot() <= 0) {
|
||||
/* If that didn't work, see if we are running in a container,
|
||||
* and a machine ID was passed in via $container_uuid the way
|
||||
* libvirt/LXC does it */
|
||||
|
||||
if (detect_container() > 0) {
|
||||
_cleanup_free_ char *e = NULL;
|
||||
|
||||
if (getenv_for_pid(1, "container_uuid", &e) > 0 &&
|
||||
sd_id128_from_string(e, ret) >= 0) {
|
||||
log_info("Initializing machine ID from container UUID.");
|
||||
return 0;
|
||||
}
|
||||
|
||||
} else if (detect_vm() == VIRTUALIZATION_KVM) {
|
||||
|
||||
/* If we are not running in a container, see if we are
|
||||
* running in qemu/kvm and a machine ID was passed in
|
||||
* via -uuid on the qemu/kvm command line */
|
||||
|
||||
if (id128_read("/sys/class/dmi/id/product_uuid", ID128_UUID, ret) >= 0) {
|
||||
log_info("Initializing machine ID from KVM UUID.");
|
||||
return 0;
|
||||
}
|
||||
/* on POWER, it's exported here instead */
|
||||
if (id128_read("/sys/firmware/devicetree/base/vm,uuid", ID128_UUID, ret) >= 0) {
|
||||
log_info("Initializing machine ID from KVM UUID.");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* If that didn't work, generate a random machine id */
|
||||
r = sd_id128_randomize(ret);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to generate randomized machine ID: %m");
|
||||
|
||||
log_info("Initializing machine ID from random generator.");
|
||||
return 0;
|
||||
}
|
||||
|
||||
int machine_id_setup(const char *root, bool force_transient, sd_id128_t machine_id, sd_id128_t *ret) {
|
||||
const char *etc_machine_id, *run_machine_id;
|
||||
_cleanup_close_ int fd = -1;
|
||||
bool writable;
|
||||
int r;
|
||||
|
||||
etc_machine_id = prefix_roota(root, "/etc/machine-id");
|
||||
|
||||
RUN_WITH_UMASK(0000) {
|
||||
/* We create this 0444, to indicate that this isn't really
|
||||
* something you should ever modify. Of course, since the file
|
||||
* will be owned by root it doesn't matter much, but maybe
|
||||
* people look. */
|
||||
|
||||
(void) mkdir_parents(etc_machine_id, 0755);
|
||||
fd = open(etc_machine_id, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
|
||||
if (fd < 0) {
|
||||
int old_errno = errno;
|
||||
|
||||
fd = open(etc_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||||
if (fd < 0) {
|
||||
if (old_errno == EROFS && errno == ENOENT)
|
||||
return log_error_errno(errno,
|
||||
"System cannot boot: Missing /etc/machine-id and /etc is mounted read-only.\n"
|
||||
"Booting up is supported only when:\n"
|
||||
"1) /etc/machine-id exists and is populated.\n"
|
||||
"2) /etc/machine-id exists and is empty.\n"
|
||||
"3) /etc/machine-id is missing and /etc is writable.\n");
|
||||
else
|
||||
return log_error_errno(errno, "Cannot open %s: %m", etc_machine_id);
|
||||
}
|
||||
|
||||
writable = false;
|
||||
} else
|
||||
writable = true;
|
||||
}
|
||||
|
||||
/* A we got a valid machine ID argument, that's what counts */
|
||||
if (sd_id128_is_null(machine_id)) {
|
||||
|
||||
/* Try to read any existing machine ID */
|
||||
if (id128_read_fd(fd, ID128_PLAIN, ret) >= 0)
|
||||
return 0;
|
||||
|
||||
/* Hmm, so, the id currently stored is not useful, then let's generate one */
|
||||
r = generate_machine_id(root, &machine_id);
|
||||
if (r < 0)
|
||||
return r;
|
||||
}
|
||||
|
||||
if (writable) {
|
||||
if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
|
||||
return log_error_errno(errno, "Failed to seek %s: %m", etc_machine_id);
|
||||
|
||||
if (ftruncate(fd, 0) < 0)
|
||||
return log_error_errno(errno, "Failed to truncate %s: %m", etc_machine_id);
|
||||
|
||||
/* If the caller requested a transient machine-id, write the string "uninitialized\n" to
|
||||
* disk and overmount it with a transient file.
|
||||
*
|
||||
* Otherwise write the machine-id directly to disk. */
|
||||
if (force_transient) {
|
||||
r = loop_write(fd, "uninitialized\n", strlen("uninitialized\n"), false);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to write uninitialized %s: %m", etc_machine_id);
|
||||
|
||||
r = fsync_full(fd);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to sync %s: %m", etc_machine_id);
|
||||
} else {
|
||||
r = id128_write_fd(fd, ID128_PLAIN, machine_id, true);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to write %s: %m", etc_machine_id);
|
||||
else
|
||||
goto finish;
|
||||
}
|
||||
}
|
||||
|
||||
fd = safe_close(fd);
|
||||
|
||||
/* Hmm, we couldn't or shouldn't write the machine-id to /etc?
|
||||
* So let's write it to /run/machine-id as a replacement */
|
||||
|
||||
run_machine_id = prefix_roota(root, "/run/machine-id");
|
||||
|
||||
RUN_WITH_UMASK(0022)
|
||||
r = id128_write(run_machine_id, ID128_PLAIN, machine_id, false);
|
||||
if (r < 0) {
|
||||
(void) unlink(run_machine_id);
|
||||
return log_error_errno(r, "Cannot write %s: %m", run_machine_id);
|
||||
}
|
||||
|
||||
/* And now, let's mount it over */
|
||||
r = mount_follow_verbose(LOG_ERR, run_machine_id, etc_machine_id, NULL, MS_BIND, NULL);
|
||||
if (r < 0) {
|
||||
(void) unlink(run_machine_id);
|
||||
return r;
|
||||
}
|
||||
|
||||
log_full(force_transient ? LOG_DEBUG : LOG_INFO, "Installed transient %s file.", etc_machine_id);
|
||||
|
||||
/* Mark the mount read-only */
|
||||
r = mount_follow_verbose(LOG_WARNING, NULL, etc_machine_id, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, NULL);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
finish:
|
||||
if (ret)
|
||||
*ret = machine_id;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int machine_id_commit(const char *root) {
|
||||
_cleanup_close_ int fd = -1, initial_mntns_fd = -1;
|
||||
const char *etc_machine_id, *sync_path;
|
||||
sd_id128_t id;
|
||||
int r;
|
||||
|
||||
/* Before doing anything, sync everything to ensure any changes by first-boot units are persisted.
|
||||
*
|
||||
* First, explicitly sync the file systems we care about and check if it worked. */
|
||||
FOREACH_STRING(sync_path, "/etc/", "/var/") {
|
||||
r = syncfs_path(AT_FDCWD, sync_path);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Cannot sync %s: %m", sync_path);
|
||||
}
|
||||
|
||||
/* Afterwards, sync() the rest too, but we can't check the return value for these. */
|
||||
sync();
|
||||
|
||||
/* Replaces a tmpfs bind mount of /etc/machine-id by a proper file, atomically. For this, the umount is removed
|
||||
* in a mount namespace, a new file is created at the right place. Afterwards the mount is also removed in the
|
||||
* original mount namespace, thus revealing the file that was just created. */
|
||||
|
||||
etc_machine_id = prefix_roota(root, "/etc/machine-id");
|
||||
|
||||
r = path_is_mount_point(etc_machine_id, NULL, 0);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to determine whether %s is a mount point: %m", etc_machine_id);
|
||||
if (r == 0) {
|
||||
log_debug("%s is not a mount point. Nothing to do.", etc_machine_id);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Read existing machine-id */
|
||||
fd = open(etc_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||||
if (fd < 0)
|
||||
return log_error_errno(errno, "Cannot open %s: %m", etc_machine_id);
|
||||
|
||||
r = fd_is_temporary_fs(fd);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to determine whether %s is on a temporary file system: %m", etc_machine_id);
|
||||
if (r == 0)
|
||||
return log_error_errno(SYNTHETIC_ERRNO(EROFS),
|
||||
"%s is not on a temporary file system.",
|
||||
etc_machine_id);
|
||||
|
||||
r = id128_read_fd(fd, ID128_PLAIN, &id);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "We didn't find a valid machine ID in %s: %m", etc_machine_id);
|
||||
|
||||
fd = safe_close(fd);
|
||||
|
||||
/* Store current mount namespace */
|
||||
r = namespace_open(0, NULL, &initial_mntns_fd, NULL, NULL, NULL);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Can't fetch current mount namespace: %m");
|
||||
|
||||
/* Switch to a new mount namespace, isolate ourself and unmount etc_machine_id in our new namespace */
|
||||
r = detach_mount_namespace();
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to set up new mount namespace: %m");
|
||||
|
||||
r = umount_verbose(LOG_ERR, etc_machine_id, 0);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
/* Update a persistent version of etc_machine_id */
|
||||
r = id128_write(etc_machine_id, ID128_PLAIN, id, true);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Cannot write %s. This is mandatory to get a persistent machine ID: %m", etc_machine_id);
|
||||
|
||||
/* Return to initial namespace and proceed a lazy tmpfs unmount */
|
||||
r = namespace_enter(-1, initial_mntns_fd, -1, -1, -1);
|
||||
if (r < 0)
|
||||
return log_warning_errno(r, "Failed to switch back to initial mount namespace: %m.\nWe'll keep transient %s file until next reboot.", etc_machine_id);
|
||||
|
||||
if (umount2(etc_machine_id, MNT_DETACH) < 0)
|
||||
return log_warning_errno(errno, "Failed to unmount transient %s file: %m.\nWe keep that mount until next reboot.", etc_machine_id);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,7 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
||||
#pragma once
|
||||
|
||||
#include <stdbool.h>
|
||||
|
||||
int machine_id_commit(const char *root);
|
||||
int machine_id_setup(const char *root, bool force_transient, sd_id128_t requested, sd_id128_t *ret);
|
||||
@@ -145,6 +145,8 @@ shared_sources = files('''
|
||||
json-internal.h
|
||||
json.c
|
||||
json.h
|
||||
killall.c
|
||||
killall.h
|
||||
libcrypt-util.c
|
||||
libcrypt-util.h
|
||||
libfido2-util.c
|
||||
@@ -165,6 +167,10 @@ shared_sources = files('''
|
||||
logs-show.h
|
||||
loop-util.c
|
||||
loop-util.h
|
||||
loopback-setup.c
|
||||
loopback-setup.h
|
||||
machine-id-setup.c
|
||||
machine-id-setup.h
|
||||
machine-image.c
|
||||
machine-image.h
|
||||
machine-pool.c
|
||||
@@ -175,6 +181,8 @@ shared_sources = files('''
|
||||
mkfs-util.c
|
||||
mkfs-util.h
|
||||
module-util.h
|
||||
mount-setup.c
|
||||
mount-setup.h
|
||||
mount-util.c
|
||||
mount-util.h
|
||||
net-condition.c
|
||||
|
||||
@@ -0,0 +1,561 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
||||
|
||||
#include <errno.h>
|
||||
#include <ftw.h>
|
||||
#include <stdlib.h>
|
||||
#include <sys/mount.h>
|
||||
#include <sys/statvfs.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include "alloc-util.h"
|
||||
#include "bus-util.h"
|
||||
#include "cgroup-util.h"
|
||||
#include "conf-files.h"
|
||||
#include "cgroup-setup.h"
|
||||
#include "dev-setup.h"
|
||||
#include "dirent-util.h"
|
||||
#include "efi-loader.h"
|
||||
#include "fd-util.h"
|
||||
#include "fileio.h"
|
||||
#include "fs-util.h"
|
||||
#include "label.h"
|
||||
#include "log.h"
|
||||
#include "macro.h"
|
||||
#include "mkdir.h"
|
||||
#include "mount-setup.h"
|
||||
#include "mount-util.h"
|
||||
#include "mountpoint-util.h"
|
||||
#include "nulstr-util.h"
|
||||
#include "path-util.h"
|
||||
#include "set.h"
|
||||
#include "smack-util.h"
|
||||
#include "strv.h"
|
||||
#include "user-util.h"
|
||||
#include "virt.h"
|
||||
|
||||
typedef enum MountMode {
|
||||
MNT_NONE = 0,
|
||||
MNT_FATAL = 1 << 0,
|
||||
MNT_IN_CONTAINER = 1 << 1,
|
||||
MNT_CHECK_WRITABLE = 1 << 2,
|
||||
MNT_FOLLOW_SYMLINK = 1 << 3,
|
||||
} MountMode;
|
||||
|
||||
typedef struct MountPoint {
|
||||
const char *what;
|
||||
const char *where;
|
||||
const char *type;
|
||||
const char *options;
|
||||
unsigned long flags;
|
||||
bool (*condition_fn)(void);
|
||||
MountMode mode;
|
||||
} MountPoint;
|
||||
|
||||
/* The first three entries we might need before SELinux is up. The
|
||||
* fourth (securityfs) is needed by IMA to load a custom policy. The
|
||||
* other ones we can delay until SELinux and IMA are loaded. When
|
||||
* SMACK is enabled we need smackfs, too, so it's a fifth one. */
|
||||
#if ENABLE_SMACK
|
||||
#define N_EARLY_MOUNT 5
|
||||
#else
|
||||
#define N_EARLY_MOUNT 4
|
||||
#endif
|
||||
|
||||
static const MountPoint mount_table[] = {
|
||||
{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
NULL, MNT_FATAL|MNT_IN_CONTAINER|MNT_FOLLOW_SYMLINK },
|
||||
{ "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
NULL, MNT_FATAL|MNT_IN_CONTAINER },
|
||||
{ "devtmpfs", "/dev", "devtmpfs", "mode=755" TMPFS_LIMITS_DEV, MS_NOSUID|MS_STRICTATIME,
|
||||
NULL, MNT_FATAL|MNT_IN_CONTAINER },
|
||||
{ "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
NULL, MNT_NONE },
|
||||
#if ENABLE_SMACK
|
||||
{ "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
mac_smack_use, MNT_FATAL },
|
||||
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
|
||||
mac_smack_use, MNT_FATAL },
|
||||
#endif
|
||||
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
|
||||
NULL, MNT_FATAL|MNT_IN_CONTAINER },
|
||||
{ "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC,
|
||||
NULL, MNT_IN_CONTAINER },
|
||||
#if ENABLE_SMACK
|
||||
{ "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*" TMPFS_LIMITS_RUN, MS_NOSUID|MS_NODEV|MS_STRICTATIME,
|
||||
mac_smack_use, MNT_FATAL },
|
||||
#endif
|
||||
{ "tmpfs", "/run", "tmpfs", "mode=755" TMPFS_LIMITS_RUN, MS_NOSUID|MS_NODEV|MS_STRICTATIME,
|
||||
NULL, MNT_FATAL|MNT_IN_CONTAINER },
|
||||
{ "cgroup2", "/sys/fs/cgroup", "cgroup2", "nsdelegate,memory_recursiveprot", MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
|
||||
{ "cgroup2", "/sys/fs/cgroup", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
|
||||
{ "cgroup2", "/sys/fs/cgroup", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
|
||||
{ "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755" TMPFS_LIMITS_SYS_FS_CGROUP, MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
|
||||
cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
|
||||
{ "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
|
||||
{ "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
|
||||
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
cg_is_legacy_wanted, MNT_IN_CONTAINER },
|
||||
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
|
||||
{ "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
NULL, MNT_NONE },
|
||||
#if ENABLE_EFI
|
||||
{ "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
is_efi_boot, MNT_NONE },
|
||||
#endif
|
||||
{ "bpf", "/sys/fs/bpf", "bpf", "mode=700", MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
NULL, MNT_NONE, },
|
||||
};
|
||||
|
||||
bool mount_point_is_api(const char *path) {
|
||||
unsigned i;
|
||||
|
||||
/* Checks if this mount point is considered "API", and hence
|
||||
* should be ignored */
|
||||
|
||||
for (i = 0; i < ELEMENTSOF(mount_table); i ++)
|
||||
if (path_equal(path, mount_table[i].where))
|
||||
return true;
|
||||
|
||||
return path_startswith(path, "/sys/fs/cgroup/");
|
||||
}
|
||||
|
||||
bool mount_point_ignore(const char *path) {
|
||||
|
||||
const char *i;
|
||||
|
||||
/* These are API file systems that might be mounted by other software, we just list them here so that
|
||||
* we know that we should ignore them. */
|
||||
FOREACH_STRING(i,
|
||||
/* SELinux file systems */
|
||||
"/sys/fs/selinux",
|
||||
/* Container bind mounts */
|
||||
"/dev/console",
|
||||
"/proc/kmsg",
|
||||
"/proc/sys",
|
||||
"/proc/sys/kernel/random/boot_id")
|
||||
if (path_equal(path, i))
|
||||
return true;
|
||||
|
||||
if (path_startswith(path, "/run/host")) /* All mounts passed in from the container manager are
|
||||
* something we better ignore. */
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static int mount_one(const MountPoint *p, bool relabel) {
|
||||
int r, priority;
|
||||
|
||||
assert(p);
|
||||
|
||||
priority = (p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG;
|
||||
|
||||
if (p->condition_fn && !p->condition_fn())
|
||||
return 0;
|
||||
|
||||
/* Relabel first, just in case */
|
||||
if (relabel)
|
||||
(void) label_fix(p->where, LABEL_IGNORE_ENOENT|LABEL_IGNORE_EROFS);
|
||||
|
||||
r = path_is_mount_point(p->where, NULL, AT_SYMLINK_FOLLOW);
|
||||
if (r < 0 && r != -ENOENT) {
|
||||
log_full_errno(priority, r, "Failed to determine whether %s is a mount point: %m", p->where);
|
||||
return (p->mode & MNT_FATAL) ? r : 0;
|
||||
}
|
||||
if (r > 0)
|
||||
return 0;
|
||||
|
||||
/* Skip securityfs in a container */
|
||||
if (!(p->mode & MNT_IN_CONTAINER) && detect_container() > 0)
|
||||
return 0;
|
||||
|
||||
/* The access mode here doesn't really matter too much, since
|
||||
* the mounted file system will take precedence anyway. */
|
||||
if (relabel)
|
||||
(void) mkdir_p_label(p->where, 0755);
|
||||
else
|
||||
(void) mkdir_p(p->where, 0755);
|
||||
|
||||
log_debug("Mounting %s to %s of type %s with options %s.",
|
||||
p->what,
|
||||
p->where,
|
||||
p->type,
|
||||
strna(p->options));
|
||||
|
||||
if (FLAGS_SET(p->mode, MNT_FOLLOW_SYMLINK))
|
||||
r = mount(p->what, p->where, p->type, p->flags, p->options) < 0 ? -errno : 0;
|
||||
else
|
||||
r = mount_nofollow(p->what, p->where, p->type, p->flags, p->options);
|
||||
if (r < 0) {
|
||||
log_full_errno(priority, r, "Failed to mount %s at %s: %m", p->type, p->where);
|
||||
return (p->mode & MNT_FATAL) ? r : 0;
|
||||
}
|
||||
|
||||
/* Relabel again, since we now mounted something fresh here */
|
||||
if (relabel)
|
||||
(void) label_fix(p->where, 0);
|
||||
|
||||
if (p->mode & MNT_CHECK_WRITABLE) {
|
||||
if (access(p->where, W_OK) < 0) {
|
||||
r = -errno;
|
||||
|
||||
(void) umount2(p->where, UMOUNT_NOFOLLOW);
|
||||
(void) rmdir(p->where);
|
||||
|
||||
log_full_errno(priority, r, "Mount point %s not writable after mounting: %m", p->where);
|
||||
return (p->mode & MNT_FATAL) ? r : 0;
|
||||
}
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int mount_points_setup(unsigned n, bool loaded_policy) {
|
||||
unsigned i;
|
||||
int r = 0;
|
||||
|
||||
for (i = 0; i < n; i ++) {
|
||||
int j;
|
||||
|
||||
j = mount_one(mount_table + i, loaded_policy);
|
||||
if (j != 0 && r >= 0)
|
||||
r = j;
|
||||
}
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int mount_setup_early(void) {
|
||||
assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table));
|
||||
|
||||
/* Do a minimal mount of /proc and friends to enable the most
|
||||
* basic stuff, such as SELinux */
|
||||
return mount_points_setup(N_EARLY_MOUNT, false);
|
||||
}
|
||||
|
||||
static const char *join_with(const char *controller) {
|
||||
|
||||
static const char* const pairs[] = {
|
||||
"cpu", "cpuacct",
|
||||
"net_cls", "net_prio",
|
||||
NULL
|
||||
};
|
||||
|
||||
const char *const *x, *const *y;
|
||||
|
||||
assert(controller);
|
||||
|
||||
/* This will lookup which controller to mount another controller with. Input is a controller name, and output
|
||||
* is the other controller name. The function works both ways: you can input one and get the other, and input
|
||||
* the other to get the one. */
|
||||
|
||||
STRV_FOREACH_PAIR(x, y, pairs) {
|
||||
if (streq(controller, *x))
|
||||
return *y;
|
||||
if (streq(controller, *y))
|
||||
return *x;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static int symlink_controller(const char *target, const char *alias) {
|
||||
const char *a;
|
||||
int r;
|
||||
|
||||
assert(target);
|
||||
assert(alias);
|
||||
|
||||
a = strjoina("/sys/fs/cgroup/", alias);
|
||||
|
||||
r = symlink_idempotent(target, a, false);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to create symlink %s: %m", a);
|
||||
|
||||
#ifdef SMACK_RUN_LABEL
|
||||
const char *p;
|
||||
|
||||
p = strjoina("/sys/fs/cgroup/", target);
|
||||
|
||||
r = mac_smack_copy(a, p);
|
||||
if (r < 0 && r != -EOPNOTSUPP)
|
||||
return log_error_errno(r, "Failed to copy smack label from %s to %s: %m", p, a);
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mount_cgroup_controllers(void) {
|
||||
_cleanup_set_free_free_ Set *controllers = NULL;
|
||||
int r;
|
||||
|
||||
if (!cg_is_legacy_wanted())
|
||||
return 0;
|
||||
|
||||
/* Mount all available cgroup controllers that are built into the kernel. */
|
||||
r = cg_kernel_controllers(&controllers);
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to enumerate cgroup controllers: %m");
|
||||
|
||||
for (;;) {
|
||||
_cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL;
|
||||
const char *other_controller;
|
||||
MountPoint p = {
|
||||
.what = "cgroup",
|
||||
.type = "cgroup",
|
||||
.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV,
|
||||
.mode = MNT_IN_CONTAINER,
|
||||
};
|
||||
|
||||
controller = set_steal_first(controllers);
|
||||
if (!controller)
|
||||
break;
|
||||
|
||||
/* Check if we shall mount this together with another controller */
|
||||
other_controller = join_with(controller);
|
||||
if (other_controller) {
|
||||
_cleanup_free_ char *c = NULL;
|
||||
|
||||
/* Check if the other controller is actually available in the kernel too */
|
||||
c = set_remove(controllers, other_controller);
|
||||
if (c) {
|
||||
|
||||
/* Join the two controllers into one string, and maintain a stable ordering */
|
||||
if (strcmp(controller, other_controller) < 0)
|
||||
options = strjoin(controller, ",", other_controller);
|
||||
else
|
||||
options = strjoin(other_controller, ",", controller);
|
||||
if (!options)
|
||||
return log_oom();
|
||||
}
|
||||
}
|
||||
|
||||
/* The simple case, where there's only one controller to mount together */
|
||||
if (!options)
|
||||
options = TAKE_PTR(controller);
|
||||
|
||||
where = path_join("/sys/fs/cgroup", options);
|
||||
if (!where)
|
||||
return log_oom();
|
||||
|
||||
p.where = where;
|
||||
p.options = options;
|
||||
|
||||
r = mount_one(&p, true);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
/* Create symlinks from the individual controller names, in case we have a joined mount */
|
||||
if (controller)
|
||||
(void) symlink_controller(options, controller);
|
||||
if (other_controller)
|
||||
(void) symlink_controller(options, other_controller);
|
||||
}
|
||||
|
||||
/* Now that we mounted everything, let's make the tmpfs the cgroup file systems are mounted into read-only. */
|
||||
(void) mount_nofollow("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755" TMPFS_LIMITS_SYS_FS_CGROUP);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#if HAVE_SELINUX || ENABLE_SMACK
|
||||
static int nftw_cb(
|
||||
const char *fpath,
|
||||
const struct stat *sb,
|
||||
int tflag,
|
||||
struct FTW *ftwbuf) {
|
||||
|
||||
/* No need to label /dev twice in a row... */
|
||||
if (_unlikely_(ftwbuf->level == 0))
|
||||
return FTW_CONTINUE;
|
||||
|
||||
(void) label_fix(fpath, 0);
|
||||
|
||||
/* /run/initramfs is static data and big, no need to
|
||||
* dynamically relabel its contents at boot... */
|
||||
if (_unlikely_(ftwbuf->level == 1 &&
|
||||
tflag == FTW_D &&
|
||||
streq(fpath, "/run/initramfs")))
|
||||
return FTW_SKIP_SUBTREE;
|
||||
|
||||
return FTW_CONTINUE;
|
||||
};
|
||||
|
||||
static int relabel_cgroup_filesystems(void) {
|
||||
int r;
|
||||
struct statfs st;
|
||||
|
||||
r = cg_all_unified();
|
||||
if (r == 0) {
|
||||
/* Temporarily remount the root cgroup filesystem to give it a proper label. Do this
|
||||
only when the filesystem has been already populated by a previous instance of systemd
|
||||
running from initrd. Otherwise don't remount anything and leave the filesystem read-write
|
||||
for the cgroup filesystems to be mounted inside. */
|
||||
if (statfs("/sys/fs/cgroup", &st) < 0)
|
||||
return log_error_errno(errno, "Failed to determine mount flags for /sys/fs/cgroup: %m");
|
||||
|
||||
if (st.f_flags & ST_RDONLY)
|
||||
(void) mount_nofollow(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT, NULL);
|
||||
|
||||
(void) label_fix("/sys/fs/cgroup", 0);
|
||||
(void) nftw("/sys/fs/cgroup", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
|
||||
|
||||
if (st.f_flags & ST_RDONLY)
|
||||
(void) mount_nofollow(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT|MS_RDONLY, NULL);
|
||||
|
||||
} else if (r < 0)
|
||||
return log_error_errno(r, "Failed to determine whether we are in all unified mode: %m");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int relabel_extra(void) {
|
||||
_cleanup_strv_free_ char **files = NULL;
|
||||
char **file;
|
||||
int r, c = 0;
|
||||
|
||||
/* Support for relabelling additional files or directories after loading the policy. For this, code in the
|
||||
* initrd simply has to drop in *.relabel files into /run/systemd/relabel-extra.d/. We'll read all such files
|
||||
* expecting one absolute path by line and will relabel each (and everyone below that in case the path refers
|
||||
* to a directory). These drop-in files are supposed to be absolutely minimal, and do not understand comments
|
||||
* and such. After the operation succeeded the files are removed, and the drop-in directory as well, if
|
||||
* possible.
|
||||
*/
|
||||
|
||||
r = conf_files_list(&files, ".relabel", NULL,
|
||||
CONF_FILES_FILTER_MASKED | CONF_FILES_REGULAR,
|
||||
"/run/systemd/relabel-extra.d/");
|
||||
if (r < 0)
|
||||
return log_error_errno(r, "Failed to enumerate /run/systemd/relabel-extra.d/, ignoring: %m");
|
||||
|
||||
STRV_FOREACH(file, files) {
|
||||
_cleanup_fclose_ FILE *f = NULL;
|
||||
|
||||
f = fopen(*file, "re");
|
||||
if (!f) {
|
||||
log_warning_errno(errno, "Failed to open %s, ignoring: %m", *file);
|
||||
continue;
|
||||
}
|
||||
|
||||
for (;;) {
|
||||
_cleanup_free_ char *line = NULL;
|
||||
|
||||
r = read_line(f, LONG_LINE_MAX, &line);
|
||||
if (r < 0) {
|
||||
log_warning_errno(r, "Failed to read %s, ignoring: %m", *file);
|
||||
break;
|
||||
}
|
||||
if (r == 0) /* EOF */
|
||||
break;
|
||||
|
||||
path_simplify(line, true);
|
||||
|
||||
if (!path_is_normalized(line)) {
|
||||
log_warning("Path to relabel is not normalized, ignoring: %s", line);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (!path_is_absolute(line)) {
|
||||
log_warning("Path to relabel is not absolute, ignoring: %s", line);
|
||||
continue;
|
||||
}
|
||||
|
||||
log_debug("Relabelling additional file/directory '%s'.", line);
|
||||
(void) label_fix(line, 0);
|
||||
(void) nftw(line, nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
|
||||
c++;
|
||||
}
|
||||
|
||||
if (unlink(*file) < 0)
|
||||
log_warning_errno(errno, "Failed to remove %s, ignoring: %m", *file);
|
||||
}
|
||||
|
||||
/* Remove when we complete things. */
|
||||
if (rmdir("/run/systemd/relabel-extra.d") < 0 &&
|
||||
errno != ENOENT)
|
||||
log_warning_errno(errno, "Failed to remove /run/systemd/relabel-extra.d/ directory: %m");
|
||||
|
||||
return c;
|
||||
}
|
||||
#endif
|
||||
|
||||
int mount_setup(bool loaded_policy, bool leave_propagation) {
|
||||
int r;
|
||||
|
||||
r = mount_points_setup(ELEMENTSOF(mount_table), loaded_policy);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
#if HAVE_SELINUX || ENABLE_SMACK
|
||||
/* Nodes in devtmpfs and /run need to be manually updated for
|
||||
* the appropriate labels, after mounting. The other virtual
|
||||
* API file systems like /sys and /proc do not need that, they
|
||||
* use the same label for all their files. */
|
||||
if (loaded_policy) {
|
||||
usec_t before_relabel, after_relabel;
|
||||
char timespan[FORMAT_TIMESPAN_MAX];
|
||||
const char *i;
|
||||
int n_extra;
|
||||
|
||||
before_relabel = now(CLOCK_MONOTONIC);
|
||||
|
||||
FOREACH_STRING(i, "/dev", "/dev/shm", "/run")
|
||||
(void) nftw(i, nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
|
||||
|
||||
(void) relabel_cgroup_filesystems();
|
||||
|
||||
n_extra = relabel_extra();
|
||||
|
||||
after_relabel = now(CLOCK_MONOTONIC);
|
||||
|
||||
log_info("Relabelled /dev, /dev/shm, /run, /sys/fs/cgroup%s in %s.",
|
||||
n_extra > 0 ? ", additional files" : "",
|
||||
format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0));
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Create a few default symlinks, which are normally created
|
||||
* by udevd, but some scripts might need them before we start
|
||||
* udevd. */
|
||||
dev_setup(NULL, UID_INVALID, GID_INVALID);
|
||||
|
||||
/* Mark the root directory as shared in regards to mount propagation. The kernel defaults to "private", but we
|
||||
* think it makes more sense to have a default of "shared" so that nspawn and the container tools work out of
|
||||
* the box. If specific setups need other settings they can reset the propagation mode to private if
|
||||
* needed. Note that we set this only when we are invoked directly by the kernel. If we are invoked by a
|
||||
* container manager we assume the container manager knows what it is doing (for example, because it set up
|
||||
* some directories with different propagation modes). */
|
||||
if (detect_container() <= 0 && !leave_propagation)
|
||||
if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0)
|
||||
log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m");
|
||||
|
||||
/* Create a few directories we always want around, Note that sd_booted() checks for /run/systemd/system, so
|
||||
* this mkdir really needs to stay for good, otherwise software that copied sd-daemon.c into their sources will
|
||||
* misdetect systemd. */
|
||||
(void) mkdir_label("/run/systemd", 0755);
|
||||
(void) mkdir_label("/run/systemd/system", 0755);
|
||||
|
||||
/* Make sure we have a mount point to hide in sandboxes */
|
||||
(void) mkdir_label("/run/credentials", 0755);
|
||||
|
||||
/* Also create /run/systemd/inaccessible nodes, so that we always have something to mount
|
||||
* inaccessible nodes from. If we run in a container the host might have created these for us already
|
||||
* in /run/host/inaccessible/. Use those if we can, since that way we likely get access to block/char
|
||||
* device nodes that are inaccessible, and if userns is used to nodes that are on mounts owned by a
|
||||
* userns outside the container and thus nicely read-only and not remountable. */
|
||||
if (access("/run/host/inaccessible/", F_OK) < 0) {
|
||||
if (errno != ENOENT)
|
||||
log_debug_errno(errno, "Failed to check if /run/host/inaccessible exists, ignoring: %m");
|
||||
|
||||
(void) make_inaccessible_nodes("/run/systemd", UID_INVALID, GID_INVALID);
|
||||
} else
|
||||
(void) symlink("../host/inaccessible", "/run/systemd/inaccessible");
|
||||
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,12 @@
|
||||
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
||||
#pragma once
|
||||
|
||||
#include <stdbool.h>
|
||||
|
||||
int mount_setup_early(void);
|
||||
int mount_setup(bool loaded_policy, bool leave_propagation);
|
||||
|
||||
int mount_cgroup_controllers(void);
|
||||
|
||||
bool mount_point_is_api(const char *path);
|
||||
bool mount_point_ignore(const char *path);
|
||||
Reference in New Issue
Block a user