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-rw-r--r--src/basic/cgroup-util.c14
-rw-r--r--src/basic/cgroup-util.h4
-rw-r--r--src/basic/rm-rf.c14
-rw-r--r--src/nspawn/nspawn-cgroup.c53
-rw-r--r--src/nspawn/nspawn-cgroup.h2
-rw-r--r--src/nspawn/nspawn.c2
-rw-r--r--src/test/test-cgroup-util.c25
7 files changed, 93 insertions, 21 deletions
diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 37e6928a46..cede835920 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -2514,6 +2514,20 @@ int cg_blkio_weight_parse(const char *s, uint64_t *ret) {
return 0;
}
+bool is_cgroup_fs(const struct statfs *s) {
+ return is_fs_type(s, CGROUP_SUPER_MAGIC) ||
+ is_fs_type(s, CGROUP2_SUPER_MAGIC);
+}
+
+bool fd_is_cgroup_fs(int fd) {
+ struct statfs s;
+
+ if (fstatfs(fd, &s) < 0)
+ return -errno;
+
+ return is_cgroup_fs(&s);
+}
+
static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
[CGROUP_CONTROLLER_CPU] = "cpu",
[CGROUP_CONTROLLER_CPUACCT] = "cpuacct",
diff --git a/src/basic/cgroup-util.h b/src/basic/cgroup-util.h
index 7529c9719e..0aa27c4cd7 100644
--- a/src/basic/cgroup-util.h
+++ b/src/basic/cgroup-util.h
@@ -23,6 +23,7 @@
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
+#include <sys/statfs.h>
#include <sys/types.h>
#include "def.h"
@@ -254,3 +255,6 @@ CGroupController cgroup_controller_from_string(const char *s) _pure_;
int cg_weight_parse(const char *s, uint64_t *ret);
int cg_cpu_shares_parse(const char *s, uint64_t *ret);
int cg_blkio_weight_parse(const char *s, uint64_t *ret);
+
+bool is_cgroup_fs(const struct statfs *s);
+bool fd_is_cgroup_fs(int fd);
diff --git a/src/basic/rm-rf.c b/src/basic/rm-rf.c
index 43816fd1bb..baa70c2c8d 100644
--- a/src/basic/rm-rf.c
+++ b/src/basic/rm-rf.c
@@ -27,6 +27,7 @@
#include <unistd.h>
#include "btrfs-util.h"
+#include "cgroup-util.h"
#include "fd-util.h"
#include "log.h"
#include "macro.h"
@@ -36,9 +37,14 @@
#include "stat-util.h"
#include "string-util.h"
+static bool is_physical_fs(const struct statfs *sfs) {
+ return !is_temporary_fs(sfs) && !is_cgroup_fs(sfs);
+}
+
int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
_cleanup_closedir_ DIR *d = NULL;
int ret = 0, r;
+ struct statfs sfs;
assert(fd >= 0);
@@ -47,13 +53,13 @@ int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
if (!(flags & REMOVE_PHYSICAL)) {
- r = fd_is_temporary_fs(fd);
+ r = fstatfs(fd, &sfs);
if (r < 0) {
safe_close(fd);
- return r;
+ return -errno;
}
- if (!r) {
+ if (is_physical_fs(&sfs)) {
/* We refuse to clean physical file systems
* with this call, unless explicitly
* requested. This is extra paranoia just to
@@ -210,7 +216,7 @@ int rm_rf(const char *path, RemoveFlags flags) {
if (statfs(path, &s) < 0)
return -errno;
- if (!is_temporary_fs(&s)) {
+ if (is_physical_fs(&s)) {
log_error("Attempted to remove disk file system, and we can't allow that.");
return -EPERM;
}
diff --git a/src/nspawn/nspawn-cgroup.c b/src/nspawn/nspawn-cgroup.c
index 6793df1286..fd0578b85c 100644
--- a/src/nspawn/nspawn-cgroup.c
+++ b/src/nspawn/nspawn-cgroup.c
@@ -25,27 +25,18 @@
#include "mkdir.h"
#include "mount-util.h"
#include "nspawn-cgroup.h"
+#include "rm-rf.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
-int chown_cgroup(pid_t pid, uid_t uid_shift) {
- _cleanup_free_ char *path = NULL, *fs = NULL;
+static int chown_cgroup_path(const char *path, uid_t uid_shift) {
_cleanup_close_ int fd = -1;
const char *fn;
- 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");
-
- fd = open(fs, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
+ fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
- return log_error_errno(errno, "Failed to open %s: %m", fs);
+ return -errno;
FOREACH_STRING(fn,
".",
@@ -63,7 +54,27 @@ int chown_cgroup(pid_t pid, uid_t uid_shift) {
return 0;
}
-int sync_cgroup(pid_t pid, CGroupUnified unified_requested) {
+int chown_cgroup(pid_t pid, uid_t uid_shift) {
+ _cleanup_free_ char *path = NULL, *fs = NULL;
+ _cleanup_close_ int fd = -1;
+ 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);
+
+ return 0;
+}
+
+int sync_cgroup(pid_t pid, CGroupUnified unified_requested, uid_t arg_uid_shift) {
_cleanup_free_ char *cgroup = NULL;
char tree[] = "/tmp/unifiedXXXXXX", pid_string[DECIMAL_STR_MAX(pid) + 1];
bool undo_mount = false;
@@ -101,14 +112,26 @@ int sync_cgroup(pid_t pid, CGroupUnified unified_requested) {
undo_mount = true;
+ /* If nspawn dies abruptly the cgroup hierarchy created below
+ * its unit isn't cleaned up. So, let's remove it
+ * https://github.com/systemd/systemd/pull/4223#issuecomment-252519810 */
+ fn = strjoina(tree, cgroup);
+ (void) rm_rf(fn, REMOVE_ROOT|REMOVE_ONLY_DIRECTORIES);
+
fn = strjoina(tree, cgroup, "/cgroup.procs");
(void) mkdir_parents(fn, 0755);
sprintf(pid_string, PID_FMT, pid);
r = write_string_file(fn, pid_string, 0);
- if (r < 0)
+ if (r < 0) {
log_error_errno(r, "Failed to move process: %m");
+ goto finish;
+ }
+ fn = strjoina(tree, cgroup);
+ r = chown_cgroup_path(fn, arg_uid_shift);
+ if (r < 0)
+ log_error_errno(r, "Failed to chown() cgroup %s: %m", fn);
finish:
if (undo_mount)
(void) umount_verbose(tree);
diff --git a/src/nspawn/nspawn-cgroup.h b/src/nspawn/nspawn-cgroup.h
index dc33da8abe..fa4321ab43 100644
--- a/src/nspawn/nspawn-cgroup.h
+++ b/src/nspawn/nspawn-cgroup.h
@@ -25,5 +25,5 @@
#include "cgroup-util.h"
int chown_cgroup(pid_t pid, uid_t uid_shift);
-int sync_cgroup(pid_t pid, CGroupUnified unified_requested);
+int sync_cgroup(pid_t pid, CGroupUnified unified_requested, uid_t uid_shift);
int create_subcgroup(pid_t pid, CGroupUnified unified_requested);
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index d95204f71e..14af51fc0e 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -3879,7 +3879,7 @@ static int run(int master,
return r;
}
- r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy);
+ r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
if (r < 0)
return r;
diff --git a/src/test/test-cgroup-util.c b/src/test/test-cgroup-util.c
index 43f8906172..c24c784e9b 100644
--- a/src/test/test-cgroup-util.c
+++ b/src/test/test-cgroup-util.c
@@ -24,6 +24,7 @@
#include "formats-util.h"
#include "parse-util.h"
#include "process-util.h"
+#include "stat-util.h"
#include "string-util.h"
#include "test-helper.h"
#include "user-util.h"
@@ -309,6 +310,28 @@ static void test_mask_supported(void) {
printf("'%s' is supported: %s\n", cgroup_controller_to_string(c), yes_no(m & CGROUP_CONTROLLER_TO_MASK(c)));
}
+static void test_is_cgroup_fs(void) {
+ struct statfs sfs;
+ assert_se(statfs("/sys/fs/cgroup", &sfs) == 0);
+ if (is_temporary_fs(&sfs))
+ assert_se(statfs("/sys/fs/cgroup/systemd", &sfs) == 0);
+ assert_se(is_cgroup_fs(&sfs));
+}
+
+static void test_fd_is_cgroup_fs(void) {
+ int fd;
+
+ fd = open("/sys/fs/cgroup", O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
+ assert_se(fd >= 0);
+ if (fd_is_temporary_fs(fd)) {
+ fd = safe_close(fd);
+ fd = open("/sys/fs/cgroup/systemd", O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
+ assert_se(fd >= 0);
+ }
+ assert_se(fd_is_cgroup_fs(fd));
+ fd = safe_close(fd);
+}
+
int main(void) {
test_path_decode_unit();
test_path_get_unit();
@@ -324,6 +347,8 @@ int main(void) {
test_slice_to_path();
test_shift_path();
TEST_REQ_RUNNING_SYSTEMD(test_mask_supported());
+ TEST_REQ_RUNNING_SYSTEMD(test_is_cgroup_fs());
+ TEST_REQ_RUNNING_SYSTEMD(test_fd_is_cgroup_fs());
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-09 16:51:18 +0000