X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcore%2Fmount-setup.c;h=34d71e5b4047e76df896a1a89f0df4e732ee4f3d;hp=2cd0b60ba7afc3c80830321ca554ffc70069f5e5;hb=4e595329a93ed190795c2e24bf132d5028ec6a72;hpb=9cde64ff264c432fc83be638e57d8fd6392793a6;ds=sidebyside diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c index 2cd0b60ba..34d71e5b4 100644 --- a/src/core/mount-setup.c +++ b/src/core/mount-setup.c @@ -42,10 +42,8 @@ #include "missing.h" #include "virt.h" #include "efivars.h" - -#ifndef TTY_GID -#define TTY_GID 5 -#endif +#include "smack-util.h" +#include "def.h" typedef enum MountMode { MNT_NONE = 0, @@ -66,7 +64,7 @@ typedef struct 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. */ -#define N_EARLY_MOUNT 4 +#define N_EARLY_MOUNT 5 static const MountPoint mount_table[] = { { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, @@ -77,18 +75,36 @@ static const MountPoint mount_table[] = { NULL, MNT_FATAL|MNT_IN_CONTAINER }, { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL, MNT_NONE }, - { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, - is_efi_boot, MNT_NONE }, +#ifdef HAVE_SMACK + { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, + use_smack, MNT_FATAL }, + { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, + use_smack, 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 }, +#ifdef HAVE_SMACK + { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, + use_smack, MNT_FATAL }, +#endif { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, NULL, MNT_FATAL|MNT_IN_CONTAINER }, { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, - NULL, MNT_IN_CONTAINER }, + NULL, MNT_FATAL|MNT_IN_CONTAINER }, +#ifdef HAVE_XATTR + { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, + NULL, MNT_FATAL|MNT_IN_CONTAINER }, +#endif { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, - NULL, MNT_IN_CONTAINER }, + NULL, MNT_FATAL|MNT_IN_CONTAINER }, + { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, + NULL, MNT_NONE }, +#ifdef ENABLE_EFI + { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, + is_efi_boot, MNT_NONE }, +#endif }; /* These are API file systems that might be mounted by other software, @@ -156,7 +172,10 @@ static int mount_one(const MountPoint *p, bool relabel) { /* The access mode here doesn't really matter too much, since * the mounted file system will take precedence anyway. */ - mkdir_p_label(p->where, 0755); + if (relabel) + mkdir_p_label(p->where, 0755); + else + mkdir_p(p->where, 0755); log_debug("Mounting %s to %s of type %s with options %s.", p->what, @@ -169,7 +188,7 @@ static int mount_one(const MountPoint *p, bool relabel) { p->type, p->flags, p->options) < 0) { - log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s: %s", p->where, strerror(errno)); + log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s at %s: %m", p->type, p->where); return (p->mode & MNT_FATAL) ? -errno : 0; } @@ -200,10 +219,10 @@ int mount_setup_early(void) { } int mount_cgroup_controllers(char ***join_controllers) { - int r; - FILE *f; + _cleanup_set_free_free_ Set *controllers = NULL; + _cleanup_fclose_ FILE *f; char buf[LINE_MAX]; - Set *controllers; + int r; /* Mount all available cgroup controllers that are built into the kernel. */ @@ -214,10 +233,8 @@ int mount_cgroup_controllers(char ***join_controllers) { } controllers = set_new(string_hash_func, string_compare_func); - if (!controllers) { - r = log_oom(); - goto finish; - } + if (!controllers) + return log_oom(); /* Ignore the header line */ (void) fgets(buf, sizeof(buf), f); @@ -232,8 +249,7 @@ int mount_cgroup_controllers(char ***join_controllers) { break; log_error("Failed to parse /proc/cgroups."); - r = -EIO; - goto finish; + return -EIO; } if (!enabled) { @@ -241,17 +257,21 @@ int mount_cgroup_controllers(char ***join_controllers) { continue; } - r = set_put(controllers, controller); + r = set_consume(controllers, controller); if (r < 0) { log_error("Failed to add controller to set."); - free(controller); - goto finish; + return r; } } for (;;) { - MountPoint p; - char *controller, *where, *options; + _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; + MountPoint p = { + .what = "cgroup", + .type = "cgroup", + .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, + .mode = MNT_IN_CONTAINER, + }; char ***k = NULL; controller = set_steal_first(controllers); @@ -269,14 +289,13 @@ int mount_cgroup_controllers(char ***join_controllers) { for (i = *k, j = *k; *i; i++) { if (!streq(*i, controller)) { - char *t; + _cleanup_free_ char *t; t = set_remove(controllers, *i); if (!t) { free(*i); continue; } - free(t); } *(j++) = *i; @@ -285,76 +304,48 @@ int mount_cgroup_controllers(char ***join_controllers) { *j = NULL; options = strv_join(*k, ","); - if (!options) { - free(controller); - r = log_oom(); - goto finish; - } - + if (!options) + return log_oom(); } else { options = controller; controller = NULL; } where = strappend("/sys/fs/cgroup/", options); - if (!where) { - free(options); - r = log_oom(); - goto finish; - } + if (!where) + return log_oom(); - zero(p); - p.what = "cgroup"; p.where = where; - p.type = "cgroup"; p.options = options; - p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV; r = mount_one(&p, true); - free(controller); - free(where); - - if (r < 0) { - free(options); - goto finish; - } + if (r < 0) + return r; if (r > 0 && k && *k) { char **i; for (i = *k; *i; i++) { - char *t; + _cleanup_free_ char *t = NULL; t = strappend("/sys/fs/cgroup/", *i); - if (!t) { - r = log_oom(); - free(options); - goto finish; - } + if (!t) + return log_oom(); r = symlink(options, t); - free(t); - if (r < 0 && errno != EEXIST) { - log_error("Failed to create symlink: %m"); - r = -errno; - free(options); - goto finish; + log_error("Failed to create symlink %s: %m", t); + return -errno; } } } - - free(options); } - r = 0; - -finish: - set_free_free(controllers); - - fclose(f); + /* Now that we mounted everything, let's make the tmpfs the + * cgroup file systems are mounted into read-only. */ + mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); - return r; + return 0; } static int nftw_cb( @@ -380,14 +371,8 @@ static int nftw_cb( }; int mount_setup(bool loaded_policy) { - - static const char relabel[] = - "/run/initramfs/root-fsck\0" - "/run/initramfs/shutdown\0"; - int r; unsigned i; - const char *j; for (i = 0; i < ELEMENTSOF(mount_table); i ++) { r = mount_one(mount_table + i, true); @@ -409,14 +394,10 @@ int mount_setup(bool loaded_policy) { 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, false); - after_relabel = now(CLOCK_MONOTONIC); log_info("Relabelled /dev and /run in %s.", - format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel)); + format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); } /* Create a few default symlinks, which are normally created @@ -434,9 +415,14 @@ int mount_setup(bool loaded_policy) { if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) log_warning("Failed to set up the root directory for shared mount propagation: %m"); - /* Create a few directories we always want around */ + /* 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. */ mkdir_label("/run/systemd", 0755); mkdir_label("/run/systemd/system", 0755); + mkdir_label("/run/systemd/inaccessible", 0000); return 0; }