diff options
Diffstat (limited to 'src/nspawn/nspawn-cgroup.c')
| -rw-r--r-- | src/nspawn/nspawn-cgroup.c | 95 |
1 files changed, 56 insertions, 39 deletions
diff --git a/src/nspawn/nspawn-cgroup.c b/src/nspawn/nspawn-cgroup.c index a500243..4f28b4a 100644 --- a/src/nspawn/nspawn-cgroup.c +++ b/src/nspawn/nspawn-cgroup.c @@ -13,6 +13,7 @@ #include "mountpoint-util.h" #include "nspawn-cgroup.h" #include "nspawn-mount.h" +#include "nsresource.h" #include "path-util.h" #include "rm-rf.h" #include "string-util.h" @@ -46,38 +47,6 @@ static int chown_cgroup_path(const char *path, uid_t uid_shift) { return 0; } -int chown_cgroup(pid_t pid, CGroupUnified unified_requested, uid_t uid_shift) { - _cleanup_free_ char *path = NULL, *fs = NULL; - int r; - - r = cg_pid_get_path(NULL, pid, &path); - if (r < 0) - return log_error_errno(r, "Failed to get container cgroup path: %m"); - - r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); - if (r < 0) - return log_error_errno(r, "Failed to get file system path for container cgroup: %m"); - - r = chown_cgroup_path(fs, uid_shift); - if (r < 0) - return log_error_errno(r, "Failed to chown() cgroup %s: %m", fs); - - if (unified_requested == CGROUP_UNIFIED_SYSTEMD || (unified_requested == CGROUP_UNIFIED_NONE && cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0)) { - _cleanup_free_ char *lfs = NULL; - /* Always propagate access rights from unified to legacy controller */ - - r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, NULL, &lfs); - if (r < 0) - return log_error_errno(r, "Failed to get file system path for container cgroup: %m"); - - r = chown_cgroup_path(lfs, uid_shift); - if (r < 0) - return log_error_errno(r, "Failed to chown() cgroup %s: %m", lfs); - } - - return 0; -} - int sync_cgroup(pid_t pid, CGroupUnified unified_requested, uid_t uid_shift) { _cleanup_free_ char *cgroup = NULL; char tree[] = "/tmp/unifiedXXXXXX", pid_string[DECIMAL_STR_MAX(pid) + 1]; @@ -142,7 +111,14 @@ finish: return r; } -int create_subcgroup(pid_t pid, bool keep_unit, CGroupUnified unified_requested) { +int create_subcgroup( + pid_t pid, + bool keep_unit, + CGroupUnified unified_requested, + uid_t uid_shift, + int userns_fd, + bool privileged) { + _cleanup_free_ char *cgroup = NULL, *payload = NULL; CGroupMask supported; char *e; @@ -185,13 +161,54 @@ int create_subcgroup(pid_t pid, bool keep_unit, CGroupUnified unified_requested) if (!payload) return log_oom(); - r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, payload, pid); + if (privileged) + r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, payload, pid); + else + r = cg_create(SYSTEMD_CGROUP_CONTROLLER, payload); if (r < 0) return log_error_errno(r, "Failed to create %s subcgroup: %m", payload); + if (privileged) { + _cleanup_free_ char *fs = NULL; + r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, payload, NULL, &fs); + if (r < 0) + return log_error_errno(r, "Failed to get file system path for container cgroup: %m"); + + r = chown_cgroup_path(fs, uid_shift); + if (r < 0) + return log_error_errno(r, "Failed to chown() cgroup %s: %m", fs); + + } else if (userns_fd >= 0) { + _cleanup_close_ int cgroup_fd = -EBADF; + + cgroup_fd = cg_path_open(SYSTEMD_CGROUP_CONTROLLER, payload); + if (cgroup_fd < 0) + return log_error_errno(cgroup_fd, "Failed to open cgroup %s: %m", payload); + + r = cg_fd_attach(cgroup_fd, pid); + if (r < 0) + return log_error_errno(r, "Failed to add process " PID_FMT " to cgroup %s: %m", pid, payload); + + r = nsresource_add_cgroup(userns_fd, cgroup_fd); + if (r < 0) + return log_error_errno(r, "Failed to add cgroup %s to userns: %m", payload); + } + + if (unified_requested == CGROUP_UNIFIED_SYSTEMD || (unified_requested == CGROUP_UNIFIED_NONE && cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0)) { + _cleanup_free_ char *lfs = NULL; + /* Always propagate access rights from unified to legacy controller */ + + r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER_LEGACY, payload, NULL, &lfs); + if (r < 0) + return log_error_errno(r, "Failed to get file system path for container cgroup: %m"); + + r = chown_cgroup_path(lfs, uid_shift); + if (r < 0) + return log_error_errno(r, "Failed to chown() cgroup %s: %m", lfs); + } + if (keep_unit) { _cleanup_free_ char *supervisor = NULL; - supervisor = path_join(cgroup, "supervisor"); if (!supervisor) return log_oom(); @@ -265,7 +282,7 @@ static int mount_legacy_cgroup_hierarchy( to = strjoina(strempty(dest), "/sys/fs/cgroup/", hierarchy); - r = path_is_mount_point(to, dest, 0); + r = path_is_mount_point_full(to, dest, /* flags = */ 0); if (r < 0 && r != -ENOENT) return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to); if (r > 0) @@ -317,7 +334,7 @@ static int mount_legacy_cgns_supported( (void) mkdir_p(cgroup_root, 0755); /* Mount a tmpfs to /sys/fs/cgroup if it's not mounted there yet. */ - r = path_is_mount_point(cgroup_root, dest, AT_SYMLINK_FOLLOW); + r = path_is_mount_point_full(cgroup_root, dest, AT_SYMLINK_FOLLOW); if (r < 0) return log_error_errno(r, "Failed to determine if /sys/fs/cgroup is already mounted: %m"); if (r == 0) { @@ -427,7 +444,7 @@ static int mount_legacy_cgns_unsupported( (void) mkdir_p(cgroup_root, 0755); /* Mount a tmpfs to /sys/fs/cgroup if it's not mounted there yet. */ - r = path_is_mount_point(cgroup_root, dest, AT_SYMLINK_FOLLOW); + r = path_is_mount_point_full(cgroup_root, dest, AT_SYMLINK_FOLLOW); if (r < 0) return log_error_errno(r, "Failed to determine if /sys/fs/cgroup is already mounted: %m"); if (r == 0) { @@ -529,7 +546,7 @@ static int mount_unified_cgroups(const char *dest) { (void) mkdir_p(p, 0755); - r = path_is_mount_point(p, dest, AT_SYMLINK_FOLLOW); + r = path_is_mount_point_full(p, dest, AT_SYMLINK_FOLLOW); if (r < 0) return log_error_errno(r, "Failed to determine if %s is mounted already: %m", p); if (r > 0) { |