mirror of https://github.com/torvalds/linux.git
selftests/namespaces: ninth active reference count tests
Test multi-level hierarchy (3+ levels deep). Grandparent → Parent → Child When child is active, both parent AND grandparent should be active. Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-31-2e6f823ebdc0@kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner
parent
94f8711080
commit
a8ce47a1ac
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@ -942,4 +942,168 @@ TEST(ns_bind_mount_keeps_in_tree)
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unlink(tmpfile);
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unlink(tmpfile);
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}
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}
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/*
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* Test multi-level hierarchy (3+ levels deep).
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* Grandparent → Parent → Child
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* When child is active, both parent AND grandparent should be active.
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*/
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TEST(ns_multilevel_hierarchy)
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{
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struct file_handle *gp_handle, *p_handle, *c_handle;
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int ret, pipefd[2];
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pid_t pid;
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int status;
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__u64 gp_id, p_id, c_id;
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char gp_buf[sizeof(*gp_handle) + MAX_HANDLE_SZ];
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char p_buf[sizeof(*p_handle) + MAX_HANDLE_SZ];
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char c_buf[sizeof(*c_handle) + MAX_HANDLE_SZ];
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ASSERT_EQ(pipe(pipefd), 0);
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pid = fork();
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ASSERT_GE(pid, 0);
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if (pid == 0) {
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close(pipefd[0]);
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/* Create grandparent user namespace */
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if (setup_userns() < 0) {
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close(pipefd[1]);
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exit(1);
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}
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int gp_fd = open("/proc/self/ns/user", O_RDONLY);
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if (gp_fd < 0) {
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close(pipefd[1]);
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exit(1);
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}
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if (ioctl(gp_fd, NS_GET_ID, &gp_id) < 0) {
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close(gp_fd);
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close(pipefd[1]);
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exit(1);
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}
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close(gp_fd);
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/* Create parent user namespace */
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if (setup_userns() < 0) {
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close(pipefd[1]);
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exit(1);
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}
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int p_fd = open("/proc/self/ns/user", O_RDONLY);
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if (p_fd < 0) {
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close(pipefd[1]);
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exit(1);
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}
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if (ioctl(p_fd, NS_GET_ID, &p_id) < 0) {
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close(p_fd);
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close(pipefd[1]);
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exit(1);
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}
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close(p_fd);
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/* Create child user namespace */
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if (setup_userns() < 0) {
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close(pipefd[1]);
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exit(1);
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}
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int c_fd = open("/proc/self/ns/user", O_RDONLY);
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if (c_fd < 0) {
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close(pipefd[1]);
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exit(1);
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}
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if (ioctl(c_fd, NS_GET_ID, &c_id) < 0) {
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close(c_fd);
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close(pipefd[1]);
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exit(1);
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}
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close(c_fd);
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/* Send all three namespace IDs */
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write(pipefd[1], &gp_id, sizeof(gp_id));
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write(pipefd[1], &p_id, sizeof(p_id));
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write(pipefd[1], &c_id, sizeof(c_id));
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close(pipefd[1]);
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exit(0);
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}
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close(pipefd[1]);
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/* Read all three namespace IDs - fixed size, no parsing needed */
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ret = read(pipefd[0], &gp_id, sizeof(gp_id));
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if (ret != sizeof(gp_id)) {
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close(pipefd[0]);
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waitpid(pid, NULL, 0);
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SKIP(return, "Failed to read grandparent namespace ID from child");
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}
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ret = read(pipefd[0], &p_id, sizeof(p_id));
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if (ret != sizeof(p_id)) {
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close(pipefd[0]);
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waitpid(pid, NULL, 0);
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SKIP(return, "Failed to read parent namespace ID from child");
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}
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ret = read(pipefd[0], &c_id, sizeof(c_id));
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close(pipefd[0]);
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if (ret != sizeof(c_id)) {
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waitpid(pid, NULL, 0);
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SKIP(return, "Failed to read child namespace ID from child");
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}
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/* Construct file handles from namespace IDs */
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gp_handle = (struct file_handle *)gp_buf;
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gp_handle->handle_bytes = sizeof(struct nsfs_file_handle);
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gp_handle->handle_type = FILEID_NSFS;
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struct nsfs_file_handle *gp_fh = (struct nsfs_file_handle *)gp_handle->f_handle;
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gp_fh->ns_id = gp_id;
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gp_fh->ns_type = 0;
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gp_fh->ns_inum = 0;
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p_handle = (struct file_handle *)p_buf;
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p_handle->handle_bytes = sizeof(struct nsfs_file_handle);
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p_handle->handle_type = FILEID_NSFS;
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struct nsfs_file_handle *p_fh = (struct nsfs_file_handle *)p_handle->f_handle;
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p_fh->ns_id = p_id;
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p_fh->ns_type = 0;
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p_fh->ns_inum = 0;
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c_handle = (struct file_handle *)c_buf;
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c_handle->handle_bytes = sizeof(struct nsfs_file_handle);
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c_handle->handle_type = FILEID_NSFS;
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struct nsfs_file_handle *c_fh = (struct nsfs_file_handle *)c_handle->f_handle;
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c_fh->ns_id = c_id;
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c_fh->ns_type = 0;
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c_fh->ns_inum = 0;
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/* Open child before process exits */
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int c_fd = open_by_handle_at(FD_NSFS_ROOT, c_handle, O_RDONLY);
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if (c_fd < 0) {
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waitpid(pid, NULL, 0);
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SKIP(return, "Failed to open child namespace");
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}
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waitpid(pid, &status, 0);
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ASSERT_TRUE(WIFEXITED(status));
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ASSERT_EQ(WEXITSTATUS(status), 0);
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/*
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* With 3-level hierarchy and child active:
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* - Child is active (we hold fd)
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* - Parent should be active (propagated from child)
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* - Grandparent should be active (propagated from parent)
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*/
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TH_LOG("Testing parent active when child is active");
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int p_fd = open_by_handle_at(FD_NSFS_ROOT, p_handle, O_RDONLY);
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ASSERT_GE(p_fd, 0);
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TH_LOG("Testing grandparent active when child is active");
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int gp_fd = open_by_handle_at(FD_NSFS_ROOT, gp_handle, O_RDONLY);
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ASSERT_GE(gp_fd, 0);
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close(c_fd);
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close(p_fd);
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close(gp_fd);
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}
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TEST_HARNESS_MAIN
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TEST_HARNESS_MAIN
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