mirror of https://github.com/torvalds/linux.git
selftests/namespaces: eleventh inactive namespace resurrection test
Test combined listns() and file handle operations with socket-kept netns. Create a netns, keep it alive with a socket, verify it appears in listns(), then reopen it via file handle obtained from listns() entry. Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-65-2e6f823ebdc0@kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
parent
3798991a9f
commit
c80168b677
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@ -974,4 +974,287 @@ TEST(siocgskns_file_handle)
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free(handle);
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}
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/*
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* Test combined listns() and file handle operations with socket-kept netns.
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* Create a netns, keep it alive with a socket, verify it appears in listns(),
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* then reopen it via file handle obtained from listns() entry.
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*/
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TEST(siocgskns_listns_and_file_handle)
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{
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int sock_fd, netns_fd, userns_fd, reopened_fd;
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int ipc_sockets[2];
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pid_t pid;
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int status;
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struct stat st;
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ino_t netns_ino;
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__u64 netns_id, userns_id;
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struct ns_id_req req = {
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.size = sizeof(req),
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.spare = 0,
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.ns_id = 0,
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.ns_type = CLONE_NEWNET | CLONE_NEWUSER,
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.spare2 = 0,
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.user_ns_id = 0,
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};
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__u64 ns_ids[256];
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int ret, i;
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bool found_netns = false, found_userns = false;
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struct file_handle *handle;
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struct nsfs_file_handle *nsfs_fh;
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/* Allocate file_handle structure for nsfs */
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handle = malloc(sizeof(struct file_handle) + sizeof(struct nsfs_file_handle));
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ASSERT_NE(handle, NULL);
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handle->handle_bytes = sizeof(struct nsfs_file_handle);
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handle->handle_type = FILEID_NSFS;
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EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 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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/* Child: create new userns and netns with socket */
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close(ipc_sockets[0]);
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if (setup_userns() < 0) {
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close(ipc_sockets[1]);
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exit(1);
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}
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if (unshare(CLONE_NEWNET) < 0) {
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close(ipc_sockets[1]);
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exit(1);
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}
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sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock_fd < 0) {
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close(ipc_sockets[1]);
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exit(1);
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}
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/* Send socket FD to parent via SCM_RIGHTS */
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struct msghdr msg = {0};
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struct iovec iov = {0};
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char buf[1] = {'X'};
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char cmsg_buf[CMSG_SPACE(sizeof(int))];
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iov.iov_base = buf;
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iov.iov_len = 1;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = cmsg_buf;
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msg.msg_controllen = sizeof(cmsg_buf);
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int));
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if (sendmsg(ipc_sockets[1], &msg, 0) < 0) {
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close(sock_fd);
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close(ipc_sockets[1]);
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exit(1);
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}
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close(sock_fd);
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close(ipc_sockets[1]);
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exit(0);
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}
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/* Parent: receive socket FD */
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close(ipc_sockets[1]);
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struct msghdr msg = {0};
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struct iovec iov = {0};
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char buf[1];
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char cmsg_buf[CMSG_SPACE(sizeof(int))];
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iov.iov_base = buf;
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iov.iov_len = 1;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = cmsg_buf;
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msg.msg_controllen = sizeof(cmsg_buf);
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ssize_t n = recvmsg(ipc_sockets[0], &msg, 0);
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close(ipc_sockets[0]);
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ASSERT_EQ(n, 1);
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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ASSERT_NE(cmsg, NULL);
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memcpy(&sock_fd, CMSG_DATA(cmsg), sizeof(int));
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/* Wait for child to exit */
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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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/* Get network namespace from socket */
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netns_fd = ioctl(sock_fd, SIOCGSKNS);
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if (netns_fd < 0) {
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free(handle);
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close(sock_fd);
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if (errno == ENOTTY || errno == EINVAL)
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SKIP(return, "SIOCGSKNS not supported");
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ASSERT_GE(netns_fd, 0);
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}
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ASSERT_EQ(fstat(netns_fd, &st), 0);
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netns_ino = st.st_ino;
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/* Get namespace ID */
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ret = ioctl(netns_fd, NS_GET_ID, &netns_id);
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if (ret < 0) {
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free(handle);
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close(sock_fd);
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close(netns_fd);
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if (errno == ENOTTY || errno == EINVAL)
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SKIP(return, "NS_GET_ID not supported");
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ASSERT_EQ(ret, 0);
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}
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/* Get owner user namespace */
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userns_fd = ioctl(netns_fd, NS_GET_USERNS);
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if (userns_fd < 0) {
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free(handle);
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close(sock_fd);
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close(netns_fd);
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if (errno == ENOTTY || errno == EINVAL)
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SKIP(return, "NS_GET_USERNS not supported");
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ASSERT_GE(userns_fd, 0);
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}
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/* Get owner namespace ID */
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ret = ioctl(userns_fd, NS_GET_ID, &userns_id);
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if (ret < 0) {
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close(userns_fd);
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free(handle);
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close(sock_fd);
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close(netns_fd);
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ASSERT_EQ(ret, 0);
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}
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close(userns_fd);
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TH_LOG("Testing netns %lu (id=%llu) owned by userns id=%llu", netns_ino, netns_id, userns_id);
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/* Verify namespace appears in listns() */
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ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
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if (ret < 0) {
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free(handle);
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close(sock_fd);
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close(netns_fd);
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if (errno == ENOSYS)
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SKIP(return, "listns() not supported");
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TH_LOG("listns failed: %s", strerror(errno));
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ASSERT_GE(ret, 0);
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}
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found_netns = false;
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found_userns = false;
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for (i = 0; i < ret; i++) {
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if (ns_ids[i] == netns_id)
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found_netns = true;
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if (ns_ids[i] == userns_id)
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found_userns = true;
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}
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ASSERT_TRUE(found_netns);
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ASSERT_TRUE(found_userns);
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TH_LOG("Found netns %llu in listns() output", netns_id);
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/* Construct file handle from namespace ID */
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nsfs_fh = (struct nsfs_file_handle *)handle->f_handle;
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nsfs_fh->ns_id = netns_id;
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nsfs_fh->ns_type = 0;
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nsfs_fh->ns_inum = 0;
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reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
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if (reopened_fd < 0) {
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free(handle);
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close(sock_fd);
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if (errno == EOPNOTSUPP || errno == ENOSYS || errno == EBADF)
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SKIP(return, "open_by_handle_at with FD_NSFS_ROOT not supported");
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TH_LOG("open_by_handle_at failed: %s", strerror(errno));
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ASSERT_GE(reopened_fd, 0);
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}
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struct stat reopened_st;
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ASSERT_EQ(fstat(reopened_fd, &reopened_st), 0);
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ASSERT_EQ(reopened_st.st_ino, netns_ino);
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TH_LOG("Successfully reopened netns %lu via file handle (socket-kept)", netns_ino);
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close(reopened_fd);
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close(netns_fd);
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/* Try to reopen via file handle - should fail since namespace is now inactive */
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reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
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ASSERT_LT(reopened_fd, 0);
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TH_LOG("Correctly failed to reopen inactive netns: %s", strerror(errno));
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/* Get network namespace from socket */
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netns_fd = ioctl(sock_fd, SIOCGSKNS);
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if (netns_fd < 0) {
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free(handle);
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close(sock_fd);
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if (errno == ENOTTY || errno == EINVAL)
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SKIP(return, "SIOCGSKNS not supported");
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ASSERT_GE(netns_fd, 0);
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}
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/* Verify namespace appears in listns() */
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ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
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if (ret < 0) {
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free(handle);
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close(sock_fd);
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close(netns_fd);
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if (errno == ENOSYS)
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SKIP(return, "listns() not supported");
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TH_LOG("listns failed: %s", strerror(errno));
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ASSERT_GE(ret, 0);
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}
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found_netns = false;
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found_userns = false;
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for (i = 0; i < ret; i++) {
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if (ns_ids[i] == netns_id)
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found_netns = true;
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if (ns_ids[i] == userns_id)
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found_userns = true;
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}
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ASSERT_TRUE(found_netns);
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ASSERT_TRUE(found_userns);
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TH_LOG("Found netns %llu in listns() output", netns_id);
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close(netns_fd);
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/* Verify namespace appears in listns() */
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ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
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if (ret < 0) {
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free(handle);
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close(sock_fd);
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close(netns_fd);
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if (errno == ENOSYS)
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SKIP(return, "listns() not supported");
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TH_LOG("listns failed: %s", strerror(errno));
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ASSERT_GE(ret, 0);
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}
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found_netns = false;
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found_userns = false;
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for (i = 0; i < ret; i++) {
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if (ns_ids[i] == netns_id)
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found_netns = true;
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if (ns_ids[i] == userns_id)
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found_userns = true;
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}
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ASSERT_FALSE(found_netns);
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ASSERT_FALSE(found_userns);
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TH_LOG("Netns %llu correctly disappeared from listns() after socket closed", netns_id);
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close(sock_fd);
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free(handle);
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}
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TEST_HARNESS_MAIN
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