X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcore%2Fcgroup.c;h=6815ca907ac5a41f331771c9a39d603aaa158882;hp=e604c3cbc694e7254a56fb5fb5389345502f2101;hb=b1491eba40715438b0ac874f2be79d5622b971e1;hpb=b1d6dcf5a5c5aa02843c026dede0638f77798cb4 diff --git a/src/core/cgroup.c b/src/core/cgroup.c index e604c3cbc..6815ca907 100644 --- a/src/core/cgroup.c +++ b/src/core/cgroup.c @@ -105,7 +105,8 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { "%sBlockIOWeight=%lu\n" "%sStartupBlockIOWeight=%lu\n" "%sMemoryLimit=%" PRIu64 "\n" - "%sDevicePolicy=%s\n", + "%sDevicePolicy=%s\n" + "%sDelegate=%s\n", prefix, yes_no(c->cpu_accounting), prefix, yes_no(c->blockio_accounting), prefix, yes_no(c->memory_accounting), @@ -115,7 +116,8 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { prefix, c->blockio_weight, prefix, c->startup_blockio_weight, prefix, c->memory_limit, - prefix, cgroup_device_policy_to_string(c->device_policy)); + prefix, cgroup_device_policy_to_string(c->device_policy), + prefix, yes_no(c->delegate)); LIST_FOREACH(device_allow, a, c->device_allow) fprintf(f, @@ -151,10 +153,8 @@ static int lookup_blkio_device(const char *p, dev_t *dev) { assert(dev); r = stat(p, &st); - if (r < 0) { - log_warning("Couldn't stat device %s: %m", p); - return -errno; - } + if (r < 0) + return log_warning_errno(errno, "Couldn't stat device %s: %m", p); if (S_ISBLK(st.st_mode)) *dev = st.st_rdev; @@ -216,10 +216,8 @@ static int whitelist_major(const char *path, const char *name, char type, const assert(type == 'b' || type == 'c'); f = fopen("/proc/devices", "re"); - if (!f) { - log_warning("Cannot open /proc/devices to resolve %s (%c): %m", name, type); - return -errno; - } + if (!f) + return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type); FOREACH_LINE(line, f, goto fail) { char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w; @@ -278,7 +276,7 @@ static int whitelist_major(const char *path, const char *name, char type, const return 0; fail: - log_warning("Failed to read /proc/devices: %m"); + log_warning_errno(errno, "Failed to read /proc/devices: %m"); return -errno; } @@ -461,7 +459,8 @@ CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) { c->memory_limit != (uint64_t) -1) mask |= CGROUP_MEMORY; - if (c->device_allow || c->device_policy != CGROUP_AUTO) + if (c->device_allow || + c->device_policy != CGROUP_AUTO) mask |= CGROUP_DEVICE; return mask; @@ -474,6 +473,19 @@ CGroupControllerMask unit_get_cgroup_mask(Unit *u) { if (!c) return 0; + /* If delegation is turned on, then turn on all cgroups, + * unless the process we fork into it is known to drop + * privileges anyway, and shouldn't get access to the + * controllers anyway. */ + + if (c->delegate) { + ExecContext *e; + + e = unit_get_exec_context(u); + if (!e || exec_context_maintains_privileges(e)) + return _CGROUP_CONTROLLER_MASK_ALL; + } + return cgroup_context_get_mask(c); } @@ -614,10 +626,8 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { /* First, create our own group */ r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path); - if (r < 0) { - log_error("Failed to create cgroup %s: %s", u->cgroup_path, strerror(-r)); - return r; - } + if (r < 0) + return log_error_errno(r, "Failed to create cgroup %s: %m", u->cgroup_path); /* Keep track that this is now realized */ u->cgroup_realized = true; @@ -626,7 +636,7 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { /* Then, possibly move things over */ r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u); if (r < 0) - log_warning("Failed to migrate cgroup from to %s: %s", u->cgroup_path, strerror(-r)); + log_warning_errno(r, "Failed to migrate cgroup from to %s: %m", u->cgroup_path); return 0; } @@ -699,7 +709,7 @@ unsigned manager_dispatch_cgroup_queue(Manager *m) { r = unit_realize_cgroup_now(i, state); if (r < 0) - log_warning("Failed to realize cgroups for queued unit %s: %s", i->id, strerror(-r)); + log_warning_errno(r, "Failed to realize cgroups for queued unit %s: %m", i->id); n++; } @@ -772,7 +782,7 @@ int unit_realize_cgroup(Unit *u) { return unit_realize_cgroup_now(u, manager_state(u->manager)); } -void unit_destroy_cgroup(Unit *u) { +void unit_destroy_cgroup_if_empty(Unit *u) { int r; assert(u); @@ -781,8 +791,10 @@ void unit_destroy_cgroup(Unit *u) { return; r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE)); - if (r < 0) - log_debug("Failed to destroy cgroup %s: %s", u->cgroup_path, strerror(-r)); + if (r < 0) { + log_debug_errno(r, "Failed to destroy cgroup %s: %m", u->cgroup_path); + return; + } hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); @@ -790,7 +802,6 @@ void unit_destroy_cgroup(Unit *u) { u->cgroup_path = NULL; u->cgroup_realized = false; u->cgroup_realized_mask = 0; - } pid_t unit_search_main_pid(Unit *u) { @@ -841,10 +852,8 @@ int manager_setup_cgroup(Manager *m) { m->cgroup_root = NULL; r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); - if (r < 0) { - log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); - return r; - } + if (r < 0) + return log_error_errno(r, "Cannot determine cgroup we are running in: %m"); /* LEGACY: Already in /system.slice? If so, let's cut this * off. This is to support live upgrades from older systemd @@ -867,10 +876,8 @@ int manager_setup_cgroup(Manager *m) { /* 2. Show data */ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); - if (r < 0) { - log_error("Cannot find cgroup mount point: %s", strerror(-r)); - return r; - } + if (r < 0) + return log_error_errno(r, "Cannot find cgroup mount point: %m"); log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); if (!m->test_run) { @@ -879,7 +886,7 @@ int manager_setup_cgroup(Manager *m) { if (m->running_as == SYSTEMD_SYSTEM) { r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); if (r < 0) - log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); + log_warning_errno(r, "Failed to install release agent, ignoring: %m"); else if (r > 0) log_debug("Installed release agent."); else @@ -888,19 +895,15 @@ int manager_setup_cgroup(Manager *m) { /* 4. Make sure we are in the root cgroup */ r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0); - if (r < 0) { - log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); - return r; - } + if (r < 0) + return log_error_errno(r, "Failed to create root cgroup hierarchy: %m"); /* 5. And pin it, so that it cannot be unmounted */ safe_close(m->pin_cgroupfs_fd); m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); - if (m->pin_cgroupfs_fd < 0) { - log_error("Failed to open pin file: %m"); - return -errno; - } + if (m->pin_cgroupfs_fd < 0) + return log_error_errno(errno, "Failed to open pin file: %m"); /* 6. Always enable hierarchial support if it exists... */ cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");