X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fcore%2Fmount-setup.c;h=0fd112f0d199810276c1f2f694d21d0cdfc98611;hb=ffc227c9568eb0a12dc750761d1e5d68ea125aad;hp=cdbee1440827f99dcd0adc393f9bde773ffbbd4a;hpb=48ac500bb65f1f2eb09704f15104eeebb9330d47;p=elogind.git diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c index cdbee1440..0fd112f0d 100644 --- a/src/core/mount-setup.c +++ b/src/core/mount-setup.c @@ -40,6 +40,7 @@ #include "mkdir.h" #include "path-util.h" #include "missing.h" +#include "virt.h" #ifndef TTY_GID #define TTY_GID 5 @@ -52,6 +53,7 @@ typedef struct MountPoint { const char *options; unsigned long flags; bool fatal; + bool in_container; } MountPoint; /* The first three entries we might need before SELinux is up. The @@ -60,15 +62,15 @@ typedef struct MountPoint { #define N_EARLY_MOUNT 4 static const MountPoint mount_table[] = { - { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, - { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, - { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true }, - { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false }, - { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true }, - { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, false }, - { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true }, - { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, false }, - { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, false }, + { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true }, + { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true }, + { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, true }, + { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false, false }, + { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, true }, + { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, false, true }, + { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, true }, + { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, false, true }, + { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, false, true }, }; /* These are API file systems that might be mounted by other software, @@ -86,10 +88,7 @@ static const char ignore_paths[] = /* Container bind mounts */ "/proc/sys\0" "/dev/console\0" - "/proc/kmsg\0" - "/etc/localtime\0" - "/etc/timezone\0" - "/etc/machine-id\0"; + "/proc/kmsg\0"; bool mount_point_is_api(const char *path) { unsigned i; @@ -121,14 +120,19 @@ static int mount_one(const MountPoint *p, bool relabel) { /* Relabel first, just in case */ if (relabel) - label_fix(p->where, true); + label_fix(p->where, true, true); - if ((r = path_is_mount_point(p->where, true)) < 0) + r = path_is_mount_point(p->where, true); + if (r < 0) return r; if (r > 0) return 0; + /* Skip securityfs in a container */ + if (!p->in_container && detect_container(NULL) > 0) + return 0; + /* 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); @@ -150,7 +154,7 @@ static int mount_one(const MountPoint *p, bool relabel) { /* Relabel again, since we now mounted something fresh here */ if (relabel) - label_fix(p->where, false); + label_fix(p->where, false, false); return 1; } @@ -190,8 +194,7 @@ int mount_cgroup_controllers(char ***join_controllers) { controllers = set_new(string_hash_func, string_compare_func); if (!controllers) { - r = -ENOMEM; - log_error("Failed to allocate controller set."); + r = log_oom(); goto finish; } @@ -262,9 +265,8 @@ int mount_cgroup_controllers(char ***join_controllers) { options = strv_join(*k, ","); if (!options) { - log_error("Failed to join options"); free(controller); - r = -ENOMEM; + r = log_oom(); goto finish; } @@ -275,9 +277,8 @@ int mount_cgroup_controllers(char ***join_controllers) { where = strappend("/sys/fs/cgroup/", options); if (!where) { - log_error("Failed to build path"); free(options); - r = -ENOMEM; + r = log_oom(); goto finish; } @@ -306,8 +307,7 @@ int mount_cgroup_controllers(char ***join_controllers) { t = strappend("/sys/fs/cgroup/", *i); if (!t) { - log_error("Failed to build path"); - r = -ENOMEM; + r = log_oom(); free(options); goto finish; } @@ -347,7 +347,7 @@ static int nftw_cb( if (_unlikely_(ftwbuf->level == 0)) return FTW_CONTINUE; - label_fix(fpath, true); + label_fix(fpath, false, false); /* /run/initramfs is static data and big, no need to * dynamically relabel its contents at boot... */ @@ -391,7 +391,7 @@ int mount_setup(bool loaded_policy) { /* Explicitly relabel these */ NULSTR_FOREACH(j, relabel) - label_fix(j, true); + label_fix(j, true, false); after_relabel = now(CLOCK_MONOTONIC); @@ -402,7 +402,17 @@ int mount_setup(bool loaded_policy) { /* Create a few default symlinks, which are normally created * by udevd, but some scripts might need them before we start * udevd. */ - dev_setup(); + dev_setup(NULL); + + /* 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. */ + if (detect_container(NULL) <= 0) + 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 */ mkdir_label("/run/systemd", 0755);