29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

3b3b7fc78d1f5bfc2769903375050048ff41ff26nd#include <sys/mount.h>

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd#include <errno.h>

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd#include <sys/stat.h>

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd#include <stdlib.h>

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd#include <string.h>

3b3b7fc78d1f5bfc2769903375050048ff41ff26nd#include <libgen.h>

fe4f1730693292317276e92e62e219422407c949nd#include <assert.h>

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include <unistd.h>

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include <ftw.h>

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

a12dd6260a66f51e25119982390def72e2db4be5nd#include "mount-setup.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include "log.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include "macro.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include "util.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include "label.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include "set.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include "strv.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#include "mkdir.h"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#ifndef TTY_GID

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#define TTY_GID 5

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#endif

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26ndtypedef struct MountPoint {

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd const char *what;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd const char *where;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd const char *type;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd const char *options;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd unsigned long flags;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd bool fatal;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd} MountPoint;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd#define N_EARLY_MOUNT 4

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26ndstatic const MountPoint mount_table[] = {

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, false },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, false },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, false },

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd};

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26ndstatic const char * const ignore_paths[] = {

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd "/sys/fs/selinux",

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd "/selinux",

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd "/proc/bus/usb"

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd};

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26ndbool mount_point_is_api(const char *path) {

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd unsigned i;

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd /* Checks if this mount point is considered "API", and hence

3b3b7fc78d1f5bfc2769903375050048ff41ff26nd

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd for (i = 0; i < ELEMENTSOF(mount_table); i ++)

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd if (path_equal(path, mount_table[i].where))

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd return true;

ad74a0524a06bfe11b7de9e3b4ce7233ab3bd3f7nd

3b3b7fc78d1f5bfc2769903375050048ff41ff26nd return path_startswith(path, "/sys/fs/cgroup/");

35714556a25fceb7c9bf9c4e01791b2e2a4c27c3nd}

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26nd

29fb68cf24dbdb4985cbb4734cb6074ea4bbab26ndbool mount_point_ignore(const char *path) {

unsigned i;

for (i = 0; i < ELEMENTSOF(ignore_paths); i++)

if (path_equal(path, ignore_paths[i]))

return true;

return false;

}

static int mount_one(const MountPoint *p, bool relabel) {

int r;

assert(p);

/* Relabel first, just in case */

if (relabel)

label_fix(p->where, true);

if ((r = path_is_mount_point(p->where, true)) < 0)

return r;

if (r > 0)

return 0;

/* The access mode here doesn't really matter too much, since

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 (mount(p->what,

p->where,

p->type,

p->flags,

p->options) < 0) {

log_error("Failed to mount %s: %s", p->where, strerror(errno));

return p->fatal ? -errno : 0;

}

/* Relabel again, since we now mounted something fresh here */

if (relabel)

label_fix(p->where, false);

return 1;

}

int mount_setup_early(void) {

unsigned i;

int r = 0;

assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table));

/* Do a minimal mount of /proc and friends to enable the most

for (i = 0; i < N_EARLY_MOUNT; i ++) {

int j;

j = mount_one(mount_table + i, false);

if (r == 0)

r = j;

}

return r;

}

int mount_cgroup_controllers(char ***join_controllers) {

int r;

FILE *f;

char buf[LINE_MAX];

Set *controllers;

/* Mount all available cgroup controllers that are built into the kernel. */

f = fopen("/proc/cgroups", "re");

if (!f) {

log_error("Failed to enumerate cgroup controllers: %m");

return 0;

}

controllers = set_new(string_hash_func, string_compare_func);

if (!controllers) {

r = -ENOMEM;

log_error("Failed to allocate controller set.");

goto finish;

}

/* Ignore the header line */

(void) fgets(buf, sizeof(buf), f);

for (;;) {

char *controller;

int enabled = 0;

if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {

if (feof(f))

break;

log_error("Failed to parse /proc/cgroups.");

r = -EIO;

goto finish;

}

if (!enabled) {

free(controller);

continue;

}

r = set_put(controllers, controller);

if (r < 0) {

log_error("Failed to add controller to set.");

free(controller);

goto finish;

}

}

for (;;) {

MountPoint p;

char *controller, *where, *options;

char ***k = NULL;

controller = set_steal_first(controllers);

if (!controller)

break;

if (join_controllers)

for (k = join_controllers; *k; k++)

if (strv_find(*k, controller))

break;

if (k && *k) {

char **i, **j;

for (i = *k, j = *k; *i; i++) {

if (!streq(*i, controller)) {

char *t;

t = set_remove(controllers, *i);

if (!t) {

free(*i);

continue;

}

free(t);

}

*(j++) = *i;

}

*j = NULL;

options = strv_join(*k, ",");

if (!options) {

log_error("Failed to join options");

free(controller);

r = -ENOMEM;

goto finish;

}

} else {

options = controller;

controller = NULL;

}

where = strappend("/sys/fs/cgroup/", options);

if (!where) {

log_error("Failed to build path");

free(options);

r = -ENOMEM;

goto finish;

}

zero(p);

p.what = "cgroup";

p.where = where;

p.type = "cgroup";

p.options = options;

p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV;

p.fatal = false;

r = mount_one(&p, true);

free(controller);

free(where);

if (r < 0) {

free(options);

goto finish;

}

if (r > 0 && k && *k) {

char **i;

for (i = *k; *i; i++) {

char *t;

t = strappend("/sys/fs/cgroup/", *i);

if (!t) {

log_error("Failed to build path");

r = -ENOMEM;

free(options);

goto finish;

}

r = symlink(options, t);

free(t);

if (r < 0 && errno != EEXIST) {

log_error("Failed to create symlink: %m");

r = -errno;

free(options);

goto finish;

}

}

}

free(options);

}

r = 0;

finish:

set_free_free(controllers);

fclose(f);

return r;

}

static int symlink_and_label(const char *old_path, const char *new_path) {

int r;

assert(old_path);

assert(new_path);

if ((r = label_symlinkfile_set(new_path)) < 0)

return r;

if (symlink(old_path, new_path) < 0)

r = -errno;

label_file_clear();

return r;

}

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;

label_fix(fpath, true);

/* /run/initramfs is static data and big, no need to

if (_unlikely_(ftwbuf->level == 1 &&

tflag == FTW_D &&

streq(fpath, "/run/initramfs")))

return FTW_SKIP_SUBTREE;

return FTW_CONTINUE;

};

int mount_setup(bool loaded_policy) {

static const char symlinks[] =

"/proc/kcore\0" "/dev/core\0"

"/proc/self/fd\0" "/dev/fd\0"

"/proc/self/fd/0\0" "/dev/stdin\0"

"/proc/self/fd/1\0" "/dev/stdout\0"

"/proc/self/fd/2\0" "/dev/stderr\0";

static const char relabel[] =

"/run/initramfs/root-fsck\0"

"/run/initramfs/shutdown\0";

int r;

unsigned i;

const char *j, *k;

for (i = 0; i < ELEMENTSOF(mount_table); i ++) {

r = mount_one(mount_table + i, true);

if (r < 0)

return r;

}

/* Nodes in devtmpfs and /run need to be manually updated for

if (loaded_policy) {

usec_t before_relabel, after_relabel;

char timespan[FORMAT_TIMESPAN_MAX];

before_relabel = now(CLOCK_MONOTONIC);

nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);

nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);

/* Explicitly relabel these */

NULSTR_FOREACH(j, relabel)

label_fix(j, true);

after_relabel = now(CLOCK_MONOTONIC);

log_info("Relabelled /dev and /run in %s.",

format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel));

}

/* Create a few default symlinks, which are normally created

NULSTR_FOREACH_PAIR(j, k, symlinks)

symlink_and_label(j, k);

/* Create a few directories we always want around */

label_mkdir("/run/systemd", 0755);

label_mkdir("/run/systemd/system", 0755);

return 0;

}