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-rw-r--r--tools/testing/selftests/namespaces/siocgskns_test.c1824
1 files changed, 1824 insertions, 0 deletions
diff --git a/tools/testing/selftests/namespaces/siocgskns_test.c b/tools/testing/selftests/namespaces/siocgskns_test.c
new file mode 100644
index 000000000000..ba689a22d82f
--- /dev/null
+++ b/tools/testing/selftests/namespaces/siocgskns_test.c
@@ -0,0 +1,1824 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <sched.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <linux/if.h>
+#include <linux/sockios.h>
+#include <linux/nsfs.h>
+#include <arpa/inet.h>
+#include "../kselftest_harness.h"
+#include "../filesystems/utils.h"
+#include "wrappers.h"
+
+#ifndef SIOCGSKNS
+#define SIOCGSKNS 0x894C
+#endif
+
+#ifndef FD_NSFS_ROOT
+#define FD_NSFS_ROOT -10003
+#endif
+
+#ifndef FILEID_NSFS
+#define FILEID_NSFS 0xf1
+#endif
+
+/*
+ * Test basic SIOCGSKNS functionality.
+ * Create a socket and verify SIOCGSKNS returns the correct network namespace.
+ */
+TEST(siocgskns_basic)
+{
+ int sock_fd, netns_fd, current_netns_fd;
+ struct stat st1, st2;
+
+ /* Create a TCP socket */
+ sock_fd = socket(AF_INET, SOCK_STREAM, 0);
+ ASSERT_GE(sock_fd, 0);
+
+ /* Use SIOCGSKNS to get network namespace */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ /* Get current network namespace */
+ current_netns_fd = open("/proc/self/ns/net", O_RDONLY);
+ ASSERT_GE(current_netns_fd, 0);
+
+ /* Verify they match */
+ ASSERT_EQ(fstat(netns_fd, &st1), 0);
+ ASSERT_EQ(fstat(current_netns_fd, &st2), 0);
+ ASSERT_EQ(st1.st_ino, st2.st_ino);
+
+ close(sock_fd);
+ close(netns_fd);
+ close(current_netns_fd);
+}
+
+/*
+ * Test that socket file descriptors keep network namespaces active.
+ * Create a network namespace, create a socket in it, then exit the namespace.
+ * The namespace should remain active while the socket FD is held.
+ */
+TEST(siocgskns_keeps_netns_active)
+{
+ int sock_fd, netns_fd, test_fd;
+ int ipc_sockets[2];
+ pid_t pid;
+ int status;
+ struct stat st;
+
+ EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 0);
+
+ pid = fork();
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ /* Child: create new netns and socket */
+ close(ipc_sockets[0]);
+
+ if (unshare(CLONE_NEWNET) < 0) {
+ TH_LOG("unshare(CLONE_NEWNET) failed: %s", strerror(errno));
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ /* Create a socket in the new network namespace */
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd < 0) {
+ TH_LOG("socket() failed: %s", strerror(errno));
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ /* Send socket FD to parent via SCM_RIGHTS */
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1] = {'X'};
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int));
+
+ if (sendmsg(ipc_sockets[1], &msg, 0) < 0) {
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(0);
+ }
+
+ /* Parent: receive socket FD */
+ close(ipc_sockets[1]);
+
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_sockets[0], &msg, 0);
+ close(ipc_sockets[0]);
+ ASSERT_EQ(n, 1);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ ASSERT_NE(cmsg, NULL);
+ ASSERT_EQ(cmsg->cmsg_type, SCM_RIGHTS);
+
+ memcpy(&sock_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Wait for child to exit */
+ waitpid(pid, &status, 0);
+ ASSERT_TRUE(WIFEXITED(status));
+ ASSERT_EQ(WEXITSTATUS(status), 0);
+
+ /* Get network namespace from socket */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ ASSERT_EQ(fstat(netns_fd, &st), 0);
+
+ /*
+ * Namespace should still be active because socket FD keeps it alive.
+ * Try to access it via /proc/self/fd/<fd>.
+ */
+ char path[64];
+ snprintf(path, sizeof(path), "/proc/self/fd/%d", netns_fd);
+ test_fd = open(path, O_RDONLY);
+ ASSERT_GE(test_fd, 0);
+ close(test_fd);
+ close(netns_fd);
+
+ /* Close socket - namespace should become inactive */
+ close(sock_fd);
+
+ /* Try SIOCGSKNS again - should fail since socket is closed */
+ ASSERT_LT(ioctl(sock_fd, SIOCGSKNS), 0);
+}
+
+/*
+ * Test SIOCGSKNS with different socket types (TCP, UDP, RAW).
+ */
+TEST(siocgskns_socket_types)
+{
+ int sock_tcp, sock_udp, sock_raw;
+ int netns_tcp, netns_udp, netns_raw;
+ struct stat st_tcp, st_udp, st_raw;
+
+ /* TCP socket */
+ sock_tcp = socket(AF_INET, SOCK_STREAM, 0);
+ ASSERT_GE(sock_tcp, 0);
+
+ /* UDP socket */
+ sock_udp = socket(AF_INET, SOCK_DGRAM, 0);
+ ASSERT_GE(sock_udp, 0);
+
+ /* RAW socket (may require privileges) */
+ sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+ if (sock_raw < 0 && (errno == EPERM || errno == EACCES)) {
+ sock_raw = -1; /* Skip raw socket test */
+ }
+
+ /* Test SIOCGSKNS on TCP */
+ netns_tcp = ioctl(sock_tcp, SIOCGSKNS);
+ if (netns_tcp < 0) {
+ close(sock_tcp);
+ close(sock_udp);
+ if (sock_raw >= 0) close(sock_raw);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_tcp, 0);
+ }
+
+ /* Test SIOCGSKNS on UDP */
+ netns_udp = ioctl(sock_udp, SIOCGSKNS);
+ ASSERT_GE(netns_udp, 0);
+
+ /* Test SIOCGSKNS on RAW (if available) */
+ if (sock_raw >= 0) {
+ netns_raw = ioctl(sock_raw, SIOCGSKNS);
+ ASSERT_GE(netns_raw, 0);
+ }
+
+ /* Verify all return the same network namespace */
+ ASSERT_EQ(fstat(netns_tcp, &st_tcp), 0);
+ ASSERT_EQ(fstat(netns_udp, &st_udp), 0);
+ ASSERT_EQ(st_tcp.st_ino, st_udp.st_ino);
+
+ if (sock_raw >= 0) {
+ ASSERT_EQ(fstat(netns_raw, &st_raw), 0);
+ ASSERT_EQ(st_tcp.st_ino, st_raw.st_ino);
+ close(netns_raw);
+ close(sock_raw);
+ }
+
+ close(netns_tcp);
+ close(netns_udp);
+ close(sock_tcp);
+ close(sock_udp);
+}
+
+/*
+ * Test SIOCGSKNS across setns.
+ * Create a socket in netns A, switch to netns B, verify SIOCGSKNS still
+ * returns netns A.
+ */
+TEST(siocgskns_across_setns)
+{
+ int sock_fd, netns_a_fd, netns_b_fd, result_fd;
+ struct stat st_a;
+
+ /* Get current netns (A) */
+ netns_a_fd = open("/proc/self/ns/net", O_RDONLY);
+ ASSERT_GE(netns_a_fd, 0);
+ ASSERT_EQ(fstat(netns_a_fd, &st_a), 0);
+
+ /* Create socket in netns A */
+ sock_fd = socket(AF_INET, SOCK_STREAM, 0);
+ ASSERT_GE(sock_fd, 0);
+
+ /* Create new netns (B) */
+ ASSERT_EQ(unshare(CLONE_NEWNET), 0);
+
+ netns_b_fd = open("/proc/self/ns/net", O_RDONLY);
+ ASSERT_GE(netns_b_fd, 0);
+
+ /* Get netns from socket created in A */
+ result_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (result_fd < 0) {
+ close(sock_fd);
+ setns(netns_a_fd, CLONE_NEWNET);
+ close(netns_a_fd);
+ close(netns_b_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(result_fd, 0);
+ }
+
+ /* Verify it still points to netns A */
+ struct stat st_result_stat;
+ ASSERT_EQ(fstat(result_fd, &st_result_stat), 0);
+ ASSERT_EQ(st_a.st_ino, st_result_stat.st_ino);
+
+ close(result_fd);
+ close(sock_fd);
+ close(netns_b_fd);
+
+ /* Restore original netns */
+ ASSERT_EQ(setns(netns_a_fd, CLONE_NEWNET), 0);
+ close(netns_a_fd);
+}
+
+/*
+ * Test SIOCGSKNS fails on non-socket file descriptors.
+ */
+TEST(siocgskns_non_socket)
+{
+ int fd;
+ int pipefd[2];
+
+ /* Test on regular file */
+ fd = open("/dev/null", O_RDONLY);
+ ASSERT_GE(fd, 0);
+
+ ASSERT_LT(ioctl(fd, SIOCGSKNS), 0);
+ ASSERT_TRUE(errno == ENOTTY || errno == EINVAL);
+ close(fd);
+
+ /* Test on pipe */
+ ASSERT_EQ(pipe(pipefd), 0);
+
+ ASSERT_LT(ioctl(pipefd[0], SIOCGSKNS), 0);
+ ASSERT_TRUE(errno == ENOTTY || errno == EINVAL);
+
+ close(pipefd[0]);
+ close(pipefd[1]);
+}
+
+/*
+ * Test multiple sockets keep the same network namespace active.
+ * Create multiple sockets, verify closing some doesn't affect others.
+ */
+TEST(siocgskns_multiple_sockets)
+{
+ int socks[5];
+ int netns_fds[5];
+ int i;
+ struct stat st;
+ ino_t netns_ino;
+
+ /* Create new network namespace */
+ ASSERT_EQ(unshare(CLONE_NEWNET), 0);
+
+ /* Create multiple sockets */
+ for (i = 0; i < 5; i++) {
+ socks[i] = socket(AF_INET, SOCK_STREAM, 0);
+ ASSERT_GE(socks[i], 0);
+ }
+
+ /* Get netns from all sockets */
+ for (i = 0; i < 5; i++) {
+ netns_fds[i] = ioctl(socks[i], SIOCGSKNS);
+ if (netns_fds[i] < 0) {
+ int j;
+ for (j = 0; j <= i; j++) {
+ close(socks[j]);
+ if (j < i && netns_fds[j] >= 0)
+ close(netns_fds[j]);
+ }
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fds[i], 0);
+ }
+ }
+
+ /* Verify all point to same netns */
+ ASSERT_EQ(fstat(netns_fds[0], &st), 0);
+ netns_ino = st.st_ino;
+
+ for (i = 1; i < 5; i++) {
+ ASSERT_EQ(fstat(netns_fds[i], &st), 0);
+ ASSERT_EQ(st.st_ino, netns_ino);
+ }
+
+ /* Close some sockets */
+ for (i = 0; i < 3; i++) {
+ close(socks[i]);
+ }
+
+ /* Remaining netns FDs should still be valid */
+ for (i = 3; i < 5; i++) {
+ char path[64];
+ snprintf(path, sizeof(path), "/proc/self/fd/%d", netns_fds[i]);
+ int test_fd = open(path, O_RDONLY);
+ ASSERT_GE(test_fd, 0);
+ close(test_fd);
+ }
+
+ /* Cleanup */
+ for (i = 0; i < 5; i++) {
+ if (i >= 3)
+ close(socks[i]);
+ close(netns_fds[i]);
+ }
+}
+
+/*
+ * Test socket keeps netns active after creating process exits.
+ * Verify that as long as the socket FD exists, the namespace remains active.
+ */
+TEST(siocgskns_netns_lifecycle)
+{
+ int sock_fd, netns_fd;
+ int ipc_sockets[2];
+ int syncpipe[2];
+ pid_t pid;
+ int status;
+ char sync_byte;
+ struct stat st;
+ ino_t netns_ino;
+
+ EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 0);
+
+ ASSERT_EQ(pipe(syncpipe), 0);
+
+ pid = fork();
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ /* Child */
+ close(ipc_sockets[0]);
+ close(syncpipe[1]);
+
+ if (unshare(CLONE_NEWNET) < 0) {
+ close(ipc_sockets[1]);
+ close(syncpipe[0]);
+ exit(1);
+ }
+
+ sock_fd = socket(AF_INET, SOCK_STREAM, 0);
+ if (sock_fd < 0) {
+ close(ipc_sockets[1]);
+ close(syncpipe[0]);
+ exit(1);
+ }
+
+ /* Send socket to parent */
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1] = {'X'};
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int));
+
+ if (sendmsg(ipc_sockets[1], &msg, 0) < 0) {
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ close(syncpipe[0]);
+ exit(1);
+ }
+
+ close(sock_fd);
+ close(ipc_sockets[1]);
+
+ /* Wait for parent signal */
+ read(syncpipe[0], &sync_byte, 1);
+ close(syncpipe[0]);
+ exit(0);
+ }
+
+ /* Parent */
+ close(ipc_sockets[1]);
+ close(syncpipe[0]);
+
+ /* Receive socket FD */
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_sockets[0], &msg, 0);
+ close(ipc_sockets[0]);
+ ASSERT_EQ(n, 1);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ ASSERT_NE(cmsg, NULL);
+ memcpy(&sock_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Get netns from socket while child is alive */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ sync_byte = 'G';
+ write(syncpipe[1], &sync_byte, 1);
+ close(syncpipe[1]);
+ close(sock_fd);
+ waitpid(pid, NULL, 0);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+ ASSERT_EQ(fstat(netns_fd, &st), 0);
+ netns_ino = st.st_ino;
+
+ /* Signal child to exit */
+ sync_byte = 'G';
+ write(syncpipe[1], &sync_byte, 1);
+ close(syncpipe[1]);
+
+ waitpid(pid, &status, 0);
+ ASSERT_TRUE(WIFEXITED(status));
+
+ /*
+ * Socket FD should still keep namespace active even after
+ * the creating process exited.
+ */
+ int test_fd = ioctl(sock_fd, SIOCGSKNS);
+ ASSERT_GE(test_fd, 0);
+
+ struct stat st_test;
+ ASSERT_EQ(fstat(test_fd, &st_test), 0);
+ ASSERT_EQ(st_test.st_ino, netns_ino);
+
+ close(test_fd);
+ close(netns_fd);
+
+ /* Close socket - namespace should become inactive */
+ close(sock_fd);
+}
+
+/*
+ * Test IPv6 sockets also work with SIOCGSKNS.
+ */
+TEST(siocgskns_ipv6)
+{
+ int sock_fd, netns_fd, current_netns_fd;
+ struct stat st1, st2;
+
+ /* Create an IPv6 TCP socket */
+ sock_fd = socket(AF_INET6, SOCK_STREAM, 0);
+ ASSERT_GE(sock_fd, 0);
+
+ /* Use SIOCGSKNS */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ /* Verify it matches current namespace */
+ current_netns_fd = open("/proc/self/ns/net", O_RDONLY);
+ ASSERT_GE(current_netns_fd, 0);
+
+ ASSERT_EQ(fstat(netns_fd, &st1), 0);
+ ASSERT_EQ(fstat(current_netns_fd, &st2), 0);
+ ASSERT_EQ(st1.st_ino, st2.st_ino);
+
+ close(sock_fd);
+ close(netns_fd);
+ close(current_netns_fd);
+}
+
+/*
+ * Test that socket-kept netns appears in listns() output.
+ * Verify that a network namespace kept alive by a socket FD appears in
+ * listns() output even after the creating process exits, and that it
+ * disappears when the socket is closed.
+ */
+TEST(siocgskns_listns_visibility)
+{
+ int sock_fd, netns_fd, owner_fd;
+ int ipc_sockets[2];
+ pid_t pid;
+ int status;
+ __u64 netns_id, owner_id;
+ struct ns_id_req req = {
+ .size = sizeof(req),
+ .spare = 0,
+ .ns_id = 0,
+ .ns_type = CLONE_NEWNET,
+ .spare2 = 0,
+ .user_ns_id = 0,
+ };
+ __u64 ns_ids[256];
+ int ret, i;
+ bool found_netns = false;
+
+ EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 0);
+
+ pid = fork();
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ /* Child: create new netns and socket */
+ close(ipc_sockets[0]);
+
+ if (unshare(CLONE_NEWNET) < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ /* Send socket FD to parent via SCM_RIGHTS */
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1] = {'X'};
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int));
+
+ if (sendmsg(ipc_sockets[1], &msg, 0) < 0) {
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(0);
+ }
+
+ /* Parent: receive socket FD */
+ close(ipc_sockets[1]);
+
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_sockets[0], &msg, 0);
+ close(ipc_sockets[0]);
+ ASSERT_EQ(n, 1);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ ASSERT_NE(cmsg, NULL);
+ memcpy(&sock_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Wait for child to exit */
+ waitpid(pid, &status, 0);
+ ASSERT_TRUE(WIFEXITED(status));
+ ASSERT_EQ(WEXITSTATUS(status), 0);
+
+ /* Get network namespace from socket */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ /* Get namespace ID */
+ ret = ioctl(netns_fd, NS_GET_ID, &netns_id);
+ if (ret < 0) {
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "NS_GET_ID not supported");
+ ASSERT_EQ(ret, 0);
+ }
+
+ /* Get owner user namespace */
+ owner_fd = ioctl(netns_fd, NS_GET_USERNS);
+ if (owner_fd < 0) {
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "NS_GET_USERNS not supported");
+ ASSERT_GE(owner_fd, 0);
+ }
+
+ /* Get owner namespace ID */
+ ret = ioctl(owner_fd, NS_GET_ID, &owner_id);
+ if (ret < 0) {
+ close(owner_fd);
+ close(sock_fd);
+ close(netns_fd);
+ ASSERT_EQ(ret, 0);
+ }
+ close(owner_fd);
+
+ /* Namespace should appear in listns() output */
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ if (ret < 0) {
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOSYS)
+ SKIP(return, "listns() not supported");
+ TH_LOG("listns failed: %s", strerror(errno));
+ ASSERT_GE(ret, 0);
+ }
+
+ /* Search for our network namespace in the list */
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_id) {
+ found_netns = true;
+ break;
+ }
+ }
+
+ ASSERT_TRUE(found_netns);
+ TH_LOG("Found netns %llu in listns() output (kept alive by socket)", netns_id);
+
+ /* Now verify with owner filtering */
+ req.user_ns_id = owner_id;
+ found_netns = false;
+
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ ASSERT_GE(ret, 0);
+
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_id) {
+ found_netns = true;
+ break;
+ }
+ }
+
+ ASSERT_TRUE(found_netns);
+ TH_LOG("Found netns %llu owned by userns %llu", netns_id, owner_id);
+
+ /* Close socket - namespace should become inactive and disappear from listns() */
+ close(sock_fd);
+ close(netns_fd);
+
+ /* Verify it's no longer in listns() output */
+ req.user_ns_id = 0;
+ found_netns = false;
+
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ ASSERT_GE(ret, 0);
+
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_id) {
+ found_netns = true;
+ break;
+ }
+ }
+
+ ASSERT_FALSE(found_netns);
+ TH_LOG("Netns %llu correctly disappeared from listns() after socket closed", netns_id);
+}
+
+/*
+ * Test that socket-kept netns can be reopened via file handle.
+ * Verify that a network namespace kept alive by a socket FD can be
+ * reopened using file handles even after the creating process exits.
+ */
+TEST(siocgskns_file_handle)
+{
+ int sock_fd, netns_fd, reopened_fd;
+ int ipc_sockets[2];
+ pid_t pid;
+ int status;
+ struct stat st1, st2;
+ ino_t netns_ino;
+ __u64 netns_id;
+ struct file_handle *handle;
+ struct nsfs_file_handle *nsfs_fh;
+ int ret;
+
+ /* Allocate file_handle structure for nsfs */
+ handle = malloc(sizeof(struct file_handle) + sizeof(struct nsfs_file_handle));
+ ASSERT_NE(handle, NULL);
+ handle->handle_bytes = sizeof(struct nsfs_file_handle);
+ handle->handle_type = FILEID_NSFS;
+
+ EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 0);
+
+ pid = fork();
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ /* Child: create new netns and socket */
+ close(ipc_sockets[0]);
+
+ if (unshare(CLONE_NEWNET) < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ /* Send socket FD to parent via SCM_RIGHTS */
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1] = {'X'};
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int));
+
+ if (sendmsg(ipc_sockets[1], &msg, 0) < 0) {
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(0);
+ }
+
+ /* Parent: receive socket FD */
+ close(ipc_sockets[1]);
+
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_sockets[0], &msg, 0);
+ close(ipc_sockets[0]);
+ ASSERT_EQ(n, 1);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ ASSERT_NE(cmsg, NULL);
+ memcpy(&sock_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Wait for child to exit */
+ waitpid(pid, &status, 0);
+ ASSERT_TRUE(WIFEXITED(status));
+ ASSERT_EQ(WEXITSTATUS(status), 0);
+
+ /* Get network namespace from socket */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ ASSERT_EQ(fstat(netns_fd, &st1), 0);
+ netns_ino = st1.st_ino;
+
+ /* Get namespace ID */
+ ret = ioctl(netns_fd, NS_GET_ID, &netns_id);
+ if (ret < 0) {
+ free(handle);
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "NS_GET_ID not supported");
+ ASSERT_EQ(ret, 0);
+ }
+
+ /* Construct file handle from namespace ID */
+ nsfs_fh = (struct nsfs_file_handle *)handle->f_handle;
+ nsfs_fh->ns_id = netns_id;
+ nsfs_fh->ns_type = 0; /* Type field not needed for reopening */
+ nsfs_fh->ns_inum = 0; /* Inum field not needed for reopening */
+
+ TH_LOG("Constructed file handle for netns %lu (id=%llu)", netns_ino, netns_id);
+
+ /* Reopen namespace using file handle (while socket still keeps it alive) */
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ if (reopened_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ if (errno == EOPNOTSUPP || errno == ENOSYS || errno == EBADF)
+ SKIP(return, "open_by_handle_at with FD_NSFS_ROOT not supported");
+ TH_LOG("open_by_handle_at failed: %s", strerror(errno));
+ ASSERT_GE(reopened_fd, 0);
+ }
+
+ /* Verify it's the same namespace */
+ ASSERT_EQ(fstat(reopened_fd, &st2), 0);
+ ASSERT_EQ(st1.st_ino, st2.st_ino);
+ ASSERT_EQ(st1.st_dev, st2.st_dev);
+
+ TH_LOG("Successfully reopened netns %lu via file handle", netns_ino);
+
+ close(reopened_fd);
+
+ /* Close the netns FD */
+ close(netns_fd);
+
+ /* Try to reopen via file handle - should fail since namespace is now inactive */
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ ASSERT_LT(reopened_fd, 0);
+ TH_LOG("Correctly failed to reopen inactive netns: %s", strerror(errno));
+
+ /* Get network namespace from socket */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ /* Reopen namespace using file handle (while socket still keeps it alive) */
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ if (reopened_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ if (errno == EOPNOTSUPP || errno == ENOSYS || errno == EBADF)
+ SKIP(return, "open_by_handle_at with FD_NSFS_ROOT not supported");
+ TH_LOG("open_by_handle_at failed: %s", strerror(errno));
+ ASSERT_GE(reopened_fd, 0);
+ }
+
+ /* Verify it's the same namespace */
+ ASSERT_EQ(fstat(reopened_fd, &st2), 0);
+ ASSERT_EQ(st1.st_ino, st2.st_ino);
+ ASSERT_EQ(st1.st_dev, st2.st_dev);
+
+ TH_LOG("Successfully reopened netns %lu via file handle", netns_ino);
+
+ /* Close socket - namespace should become inactive */
+ close(sock_fd);
+ free(handle);
+}
+
+/*
+ * 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.
+ */
+TEST(siocgskns_listns_and_file_handle)
+{
+ int sock_fd, netns_fd, userns_fd, reopened_fd;
+ int ipc_sockets[2];
+ pid_t pid;
+ int status;
+ struct stat st;
+ ino_t netns_ino;
+ __u64 netns_id, userns_id;
+ struct ns_id_req req = {
+ .size = sizeof(req),
+ .spare = 0,
+ .ns_id = 0,
+ .ns_type = CLONE_NEWNET | CLONE_NEWUSER,
+ .spare2 = 0,
+ .user_ns_id = 0,
+ };
+ __u64 ns_ids[256];
+ int ret, i;
+ bool found_netns = false, found_userns = false;
+ struct file_handle *handle;
+ struct nsfs_file_handle *nsfs_fh;
+
+ /* Allocate file_handle structure for nsfs */
+ handle = malloc(sizeof(struct file_handle) + sizeof(struct nsfs_file_handle));
+ ASSERT_NE(handle, NULL);
+ handle->handle_bytes = sizeof(struct nsfs_file_handle);
+ handle->handle_type = FILEID_NSFS;
+
+ EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 0);
+
+ pid = fork();
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0) {
+ /* Child: create new userns and netns with socket */
+ close(ipc_sockets[0]);
+
+ if (setup_userns() < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ if (unshare(CLONE_NEWNET) < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ /* Send socket FD to parent via SCM_RIGHTS */
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1] = {'X'};
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int));
+
+ if (sendmsg(ipc_sockets[1], &msg, 0) < 0) {
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ close(sock_fd);
+ close(ipc_sockets[1]);
+ exit(0);
+ }
+
+ /* Parent: receive socket FD */
+ close(ipc_sockets[1]);
+
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_sockets[0], &msg, 0);
+ close(ipc_sockets[0]);
+ ASSERT_EQ(n, 1);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ ASSERT_NE(cmsg, NULL);
+ memcpy(&sock_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Wait for child to exit */
+ waitpid(pid, &status, 0);
+ ASSERT_TRUE(WIFEXITED(status));
+ ASSERT_EQ(WEXITSTATUS(status), 0);
+
+ /* Get network namespace from socket */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ ASSERT_EQ(fstat(netns_fd, &st), 0);
+ netns_ino = st.st_ino;
+
+ /* Get namespace ID */
+ ret = ioctl(netns_fd, NS_GET_ID, &netns_id);
+ if (ret < 0) {
+ free(handle);
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "NS_GET_ID not supported");
+ ASSERT_EQ(ret, 0);
+ }
+
+ /* Get owner user namespace */
+ userns_fd = ioctl(netns_fd, NS_GET_USERNS);
+ if (userns_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "NS_GET_USERNS not supported");
+ ASSERT_GE(userns_fd, 0);
+ }
+
+ /* Get owner namespace ID */
+ ret = ioctl(userns_fd, NS_GET_ID, &userns_id);
+ if (ret < 0) {
+ close(userns_fd);
+ free(handle);
+ close(sock_fd);
+ close(netns_fd);
+ ASSERT_EQ(ret, 0);
+ }
+ close(userns_fd);
+
+ TH_LOG("Testing netns %lu (id=%llu) owned by userns id=%llu", netns_ino, netns_id, userns_id);
+
+ /* Verify namespace appears in listns() */
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ if (ret < 0) {
+ free(handle);
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOSYS)
+ SKIP(return, "listns() not supported");
+ TH_LOG("listns failed: %s", strerror(errno));
+ ASSERT_GE(ret, 0);
+ }
+
+ found_netns = false;
+ found_userns = false;
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_id)
+ found_netns = true;
+ if (ns_ids[i] == userns_id)
+ found_userns = true;
+ }
+ ASSERT_TRUE(found_netns);
+ ASSERT_TRUE(found_userns);
+ TH_LOG("Found netns %llu in listns() output", netns_id);
+
+ /* Construct file handle from namespace ID */
+ nsfs_fh = (struct nsfs_file_handle *)handle->f_handle;
+ nsfs_fh->ns_id = netns_id;
+ nsfs_fh->ns_type = 0;
+ nsfs_fh->ns_inum = 0;
+
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ if (reopened_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ if (errno == EOPNOTSUPP || errno == ENOSYS || errno == EBADF)
+ SKIP(return, "open_by_handle_at with FD_NSFS_ROOT not supported");
+ TH_LOG("open_by_handle_at failed: %s", strerror(errno));
+ ASSERT_GE(reopened_fd, 0);
+ }
+
+ struct stat reopened_st;
+ ASSERT_EQ(fstat(reopened_fd, &reopened_st), 0);
+ ASSERT_EQ(reopened_st.st_ino, netns_ino);
+
+ TH_LOG("Successfully reopened netns %lu via file handle (socket-kept)", netns_ino);
+
+ close(reopened_fd);
+ close(netns_fd);
+
+ /* Try to reopen via file handle - should fail since namespace is now inactive */
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ ASSERT_LT(reopened_fd, 0);
+ TH_LOG("Correctly failed to reopen inactive netns: %s", strerror(errno));
+
+ /* Get network namespace from socket */
+ netns_fd = ioctl(sock_fd, SIOCGSKNS);
+ if (netns_fd < 0) {
+ free(handle);
+ close(sock_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_fd, 0);
+ }
+
+ /* Verify namespace appears in listns() */
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ if (ret < 0) {
+ free(handle);
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOSYS)
+ SKIP(return, "listns() not supported");
+ TH_LOG("listns failed: %s", strerror(errno));
+ ASSERT_GE(ret, 0);
+ }
+
+ found_netns = false;
+ found_userns = false;
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_id)
+ found_netns = true;
+ if (ns_ids[i] == userns_id)
+ found_userns = true;
+ }
+ ASSERT_TRUE(found_netns);
+ ASSERT_TRUE(found_userns);
+ TH_LOG("Found netns %llu in listns() output", netns_id);
+
+ close(netns_fd);
+
+ /* Verify namespace appears in listns() */
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ if (ret < 0) {
+ free(handle);
+ close(sock_fd);
+ close(netns_fd);
+ if (errno == ENOSYS)
+ SKIP(return, "listns() not supported");
+ TH_LOG("listns failed: %s", strerror(errno));
+ ASSERT_GE(ret, 0);
+ }
+
+ found_netns = false;
+ found_userns = false;
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_id)
+ found_netns = true;
+ if (ns_ids[i] == userns_id)
+ found_userns = true;
+ }
+ ASSERT_FALSE(found_netns);
+ ASSERT_FALSE(found_userns);
+ TH_LOG("Netns %llu correctly disappeared from listns() after socket closed", netns_id);
+
+ close(sock_fd);
+ free(handle);
+}
+
+/*
+ * Test multi-level namespace resurrection across three user namespace levels.
+ *
+ * This test creates a complex namespace hierarchy with three levels of user
+ * namespaces and a network namespace at the deepest level. It verifies that
+ * the resurrection semantics work correctly when SIOCGSKNS is called on a
+ * socket from an inactive namespace tree, and that listns() and
+ * open_by_handle_at() correctly respect visibility rules.
+ *
+ * Hierarchy after child processes exit (all with 0 active refcount):
+ *
+ * net_L3A (0) <- Level 3 network namespace
+ * |
+ * +
+ * userns_L3 (0) <- Level 3 user namespace
+ * |
+ * +
+ * userns_L2 (0) <- Level 2 user namespace
+ * |
+ * +
+ * userns_L1 (0) <- Level 1 user namespace
+ * |
+ * x
+ * init_user_ns
+ *
+ * The test verifies:
+ * 1. SIOCGSKNS on a socket from inactive net_L3A resurrects the entire chain
+ * 2. After resurrection, all namespaces are visible in listns()
+ * 3. Resurrected namespaces can be reopened via file handles
+ * 4. Closing the netns FD cascades down: the entire ownership chain
+ * (userns_L3 -> userns_L2 -> userns_L1) becomes inactive again
+ * 5. Inactive namespaces disappear from listns() and cannot be reopened
+ * 6. Calling SIOCGSKNS again on the same socket resurrects the tree again
+ * 7. After second resurrection, namespaces are visible and can be reopened
+ */
+TEST(siocgskns_multilevel_resurrection)
+{
+ int ipc_sockets[2];
+ pid_t pid_l1, pid_l2, pid_l3;
+ int status;
+
+ /* Namespace file descriptors to be received from child */
+ int sock_L3A_fd = -1;
+ int netns_L3A_fd = -1;
+ __u64 netns_L3A_id;
+ __u64 userns_L1_id, userns_L2_id, userns_L3_id;
+
+ /* For listns() and file handle testing */
+ struct ns_id_req req = {
+ .size = sizeof(req),
+ .spare = 0,
+ .ns_id = 0,
+ .ns_type = CLONE_NEWNET | CLONE_NEWUSER,
+ .spare2 = 0,
+ .user_ns_id = 0,
+ };
+ __u64 ns_ids[256];
+ int ret, i;
+ struct file_handle *handle;
+ struct nsfs_file_handle *nsfs_fh;
+ int reopened_fd;
+
+ /* Allocate file handle for testing */
+ handle = malloc(sizeof(struct file_handle) + sizeof(struct nsfs_file_handle));
+ ASSERT_NE(handle, NULL);
+ handle->handle_bytes = sizeof(struct nsfs_file_handle);
+ handle->handle_type = FILEID_NSFS;
+
+ EXPECT_EQ(socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets), 0);
+
+ /*
+ * Fork level 1 child that creates userns_L1
+ */
+ pid_l1 = fork();
+ ASSERT_GE(pid_l1, 0);
+
+ if (pid_l1 == 0) {
+ /* Level 1 child */
+ int ipc_L2[2];
+ close(ipc_sockets[0]);
+
+ /* Create userns_L1 */
+ if (setup_userns() < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ /* Create socketpair for communicating with L2 child */
+ if (socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_L2) < 0) {
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ /*
+ * Fork level 2 child that creates userns_L2
+ */
+ pid_l2 = fork();
+ if (pid_l2 < 0) {
+ close(ipc_sockets[1]);
+ close(ipc_L2[0]);
+ close(ipc_L2[1]);
+ exit(1);
+ }
+
+ if (pid_l2 == 0) {
+ /* Level 2 child */
+ int ipc_L3[2];
+ close(ipc_L2[0]);
+
+ /* Create userns_L2 (nested inside userns_L1) */
+ if (setup_userns() < 0) {
+ close(ipc_L2[1]);
+ exit(1);
+ }
+
+ /* Create socketpair for communicating with L3 child */
+ if (socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_L3) < 0) {
+ close(ipc_L2[1]);
+ exit(1);
+ }
+
+ /*
+ * Fork level 3 child that creates userns_L3 and network namespaces
+ */
+ pid_l3 = fork();
+ if (pid_l3 < 0) {
+ close(ipc_L2[1]);
+ close(ipc_L3[0]);
+ close(ipc_L3[1]);
+ exit(1);
+ }
+
+ if (pid_l3 == 0) {
+ /* Level 3 child - the deepest level */
+ int sock_fd;
+ close(ipc_L3[0]);
+
+ /* Create userns_L3 (nested inside userns_L2) */
+ if (setup_userns() < 0) {
+ close(ipc_L3[1]);
+ exit(1);
+ }
+
+ /* Create network namespace at level 3 */
+ if (unshare(CLONE_NEWNET) < 0) {
+ close(ipc_L3[1]);
+ exit(1);
+ }
+
+ /* Create socket in net_L3A */
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd < 0) {
+ close(ipc_L3[1]);
+ exit(1);
+ }
+
+ /* Send socket FD to L2 parent */
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1] = {'X'};
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &sock_fd, sizeof(int));
+
+ if (sendmsg(ipc_L3[1], &msg, 0) < 0) {
+ close(sock_fd);
+ close(ipc_L3[1]);
+ exit(1);
+ }
+
+ close(sock_fd);
+ close(ipc_L3[1]);
+ exit(0);
+ }
+
+ /* Level 2 child - receive from L3 and forward to L1 */
+ close(ipc_L3[1]);
+
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+ int received_fd;
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_L3[0], &msg, 0);
+ close(ipc_L3[0]);
+
+ if (n != 1) {
+ close(ipc_L2[1]);
+ waitpid(pid_l3, NULL, 0);
+ exit(1);
+ }
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ if (!cmsg) {
+ close(ipc_L2[1]);
+ waitpid(pid_l3, NULL, 0);
+ exit(1);
+ }
+ memcpy(&received_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Wait for L3 child */
+ waitpid(pid_l3, NULL, 0);
+
+ /* Forward the socket FD to L1 parent */
+ memset(&msg, 0, sizeof(msg));
+ buf[0] = 'Y';
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &received_fd, sizeof(int));
+
+ if (sendmsg(ipc_L2[1], &msg, 0) < 0) {
+ close(received_fd);
+ close(ipc_L2[1]);
+ exit(1);
+ }
+
+ close(received_fd);
+ close(ipc_L2[1]);
+ exit(0);
+ }
+
+ /* Level 1 child - receive from L2 and forward to parent */
+ close(ipc_L2[1]);
+
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+ int received_fd;
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_L2[0], &msg, 0);
+ close(ipc_L2[0]);
+
+ if (n != 1) {
+ close(ipc_sockets[1]);
+ waitpid(pid_l2, NULL, 0);
+ exit(1);
+ }
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ if (!cmsg) {
+ close(ipc_sockets[1]);
+ waitpid(pid_l2, NULL, 0);
+ exit(1);
+ }
+ memcpy(&received_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Wait for L2 child */
+ waitpid(pid_l2, NULL, 0);
+
+ /* Forward the socket FD to parent */
+ memset(&msg, 0, sizeof(msg));
+ buf[0] = 'Z';
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &received_fd, sizeof(int));
+
+ if (sendmsg(ipc_sockets[1], &msg, 0) < 0) {
+ close(received_fd);
+ close(ipc_sockets[1]);
+ exit(1);
+ }
+
+ close(received_fd);
+ close(ipc_sockets[1]);
+ exit(0);
+ }
+
+ /* Parent - receive the socket from the deepest level */
+ close(ipc_sockets[1]);
+
+ struct msghdr msg = {0};
+ struct iovec iov = {0};
+ char buf[1];
+ char cmsg_buf[CMSG_SPACE(sizeof(int))];
+
+ iov.iov_base = buf;
+ iov.iov_len = 1;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cmsg_buf;
+ msg.msg_controllen = sizeof(cmsg_buf);
+
+ ssize_t n = recvmsg(ipc_sockets[0], &msg, 0);
+ close(ipc_sockets[0]);
+
+ if (n != 1) {
+ free(handle);
+ waitpid(pid_l1, NULL, 0);
+ SKIP(return, "Failed to receive socket from child");
+ }
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ if (!cmsg) {
+ free(handle);
+ waitpid(pid_l1, NULL, 0);
+ SKIP(return, "Failed to receive socket from child");
+ }
+ memcpy(&sock_L3A_fd, CMSG_DATA(cmsg), sizeof(int));
+
+ /* Wait for L1 child */
+ waitpid(pid_l1, &status, 0);
+ ASSERT_TRUE(WIFEXITED(status));
+ ASSERT_EQ(WEXITSTATUS(status), 0);
+
+ /*
+ * At this point, all child processes have exited. The socket itself
+ * doesn't keep the namespace active - we need to call SIOCGSKNS which
+ * will resurrect the entire namespace tree by taking active references.
+ */
+
+ /* Get network namespace from socket - this resurrects the tree */
+ netns_L3A_fd = ioctl(sock_L3A_fd, SIOCGSKNS);
+ if (netns_L3A_fd < 0) {
+ free(handle);
+ close(sock_L3A_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "SIOCGSKNS not supported");
+ ASSERT_GE(netns_L3A_fd, 0);
+ }
+
+ /* Get namespace ID for net_L3A */
+ ret = ioctl(netns_L3A_fd, NS_GET_ID, &netns_L3A_id);
+ if (ret < 0) {
+ free(handle);
+ close(sock_L3A_fd);
+ close(netns_L3A_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "NS_GET_ID not supported");
+ ASSERT_EQ(ret, 0);
+ }
+
+ /* Get owner user namespace chain: userns_L3 -> userns_L2 -> userns_L1 */
+ int userns_L3_fd = ioctl(netns_L3A_fd, NS_GET_USERNS);
+ if (userns_L3_fd < 0) {
+ free(handle);
+ close(sock_L3A_fd);
+ close(netns_L3A_fd);
+ if (errno == ENOTTY || errno == EINVAL)
+ SKIP(return, "NS_GET_USERNS not supported");
+ ASSERT_GE(userns_L3_fd, 0);
+ }
+
+ ret = ioctl(userns_L3_fd, NS_GET_ID, &userns_L3_id);
+ ASSERT_EQ(ret, 0);
+
+ int userns_L2_fd = ioctl(userns_L3_fd, NS_GET_USERNS);
+ ASSERT_GE(userns_L2_fd, 0);
+ ret = ioctl(userns_L2_fd, NS_GET_ID, &userns_L2_id);
+ ASSERT_EQ(ret, 0);
+
+ int userns_L1_fd = ioctl(userns_L2_fd, NS_GET_USERNS);
+ ASSERT_GE(userns_L1_fd, 0);
+ ret = ioctl(userns_L1_fd, NS_GET_ID, &userns_L1_id);
+ ASSERT_EQ(ret, 0);
+
+ close(userns_L1_fd);
+ close(userns_L2_fd);
+ close(userns_L3_fd);
+
+ TH_LOG("Multi-level hierarchy: net_L3A (id=%llu) -> userns_L3 (id=%llu) -> userns_L2 (id=%llu) -> userns_L1 (id=%llu)",
+ netns_L3A_id, userns_L3_id, userns_L2_id, userns_L1_id);
+
+ /*
+ * Test 1: Verify net_L3A is visible in listns() after resurrection.
+ * The entire ownership chain should be resurrected and visible.
+ */
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ if (ret < 0) {
+ free(handle);
+ close(sock_L3A_fd);
+ close(netns_L3A_fd);
+ if (errno == ENOSYS)
+ SKIP(return, "listns() not supported");
+ ASSERT_GE(ret, 0);
+ }
+
+ bool found_netns_L3A = false;
+ bool found_userns_L1 = false;
+ bool found_userns_L2 = false;
+ bool found_userns_L3 = false;
+
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_L3A_id)
+ found_netns_L3A = true;
+ if (ns_ids[i] == userns_L1_id)
+ found_userns_L1 = true;
+ if (ns_ids[i] == userns_L2_id)
+ found_userns_L2 = true;
+ if (ns_ids[i] == userns_L3_id)
+ found_userns_L3 = true;
+ }
+
+ ASSERT_TRUE(found_netns_L3A);
+ ASSERT_TRUE(found_userns_L1);
+ ASSERT_TRUE(found_userns_L2);
+ ASSERT_TRUE(found_userns_L3);
+ TH_LOG("Resurrection verified: all namespaces in hierarchy visible in listns()");
+
+ /*
+ * Test 2: Verify net_L3A can be reopened via file handle.
+ */
+ nsfs_fh = (struct nsfs_file_handle *)handle->f_handle;
+ nsfs_fh->ns_id = netns_L3A_id;
+ nsfs_fh->ns_type = 0;
+ nsfs_fh->ns_inum = 0;
+
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ if (reopened_fd < 0) {
+ free(handle);
+ close(sock_L3A_fd);
+ close(netns_L3A_fd);
+ if (errno == EOPNOTSUPP || errno == ENOSYS || errno == EBADF)
+ SKIP(return, "open_by_handle_at with FD_NSFS_ROOT not supported");
+ TH_LOG("open_by_handle_at failed: %s", strerror(errno));
+ ASSERT_GE(reopened_fd, 0);
+ }
+
+ close(reopened_fd);
+ TH_LOG("File handle test passed: net_L3A can be reopened");
+
+ /*
+ * Test 3: Verify that when we close the netns FD (dropping the last
+ * active reference), the entire tree becomes inactive and disappears
+ * from listns(). The cascade goes: net_L3A drops -> userns_L3 drops ->
+ * userns_L2 drops -> userns_L1 drops.
+ */
+ close(netns_L3A_fd);
+
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ ASSERT_GE(ret, 0);
+
+ found_netns_L3A = false;
+ found_userns_L1 = false;
+ found_userns_L2 = false;
+ found_userns_L3 = false;
+
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_L3A_id)
+ found_netns_L3A = true;
+ if (ns_ids[i] == userns_L1_id)
+ found_userns_L1 = true;
+ if (ns_ids[i] == userns_L2_id)
+ found_userns_L2 = true;
+ if (ns_ids[i] == userns_L3_id)
+ found_userns_L3 = true;
+ }
+
+ ASSERT_FALSE(found_netns_L3A);
+ ASSERT_FALSE(found_userns_L1);
+ ASSERT_FALSE(found_userns_L2);
+ ASSERT_FALSE(found_userns_L3);
+ TH_LOG("Cascade test passed: all namespaces disappeared after netns FD closed");
+
+ /*
+ * Test 4: Verify file handle no longer works for inactive namespace.
+ */
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ if (reopened_fd >= 0) {
+ close(reopened_fd);
+ free(handle);
+ ASSERT_TRUE(false); /* Should have failed */
+ }
+ TH_LOG("Inactive namespace correctly cannot be reopened via file handle");
+
+ /*
+ * Test 5: Verify that calling SIOCGSKNS again resurrects the tree again.
+ * The socket is still valid, so we can call SIOCGSKNS on it to resurrect
+ * the namespace tree once more.
+ */
+ netns_L3A_fd = ioctl(sock_L3A_fd, SIOCGSKNS);
+ ASSERT_GE(netns_L3A_fd, 0);
+
+ TH_LOG("Called SIOCGSKNS again to resurrect the namespace tree");
+
+ /* Verify the namespace tree is resurrected and visible in listns() */
+ ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
+ ASSERT_GE(ret, 0);
+
+ found_netns_L3A = false;
+ found_userns_L1 = false;
+ found_userns_L2 = false;
+ found_userns_L3 = false;
+
+ for (i = 0; i < ret; i++) {
+ if (ns_ids[i] == netns_L3A_id)
+ found_netns_L3A = true;
+ if (ns_ids[i] == userns_L1_id)
+ found_userns_L1 = true;
+ if (ns_ids[i] == userns_L2_id)
+ found_userns_L2 = true;
+ if (ns_ids[i] == userns_L3_id)
+ found_userns_L3 = true;
+ }
+
+ ASSERT_TRUE(found_netns_L3A);
+ ASSERT_TRUE(found_userns_L1);
+ ASSERT_TRUE(found_userns_L2);
+ ASSERT_TRUE(found_userns_L3);
+ TH_LOG("Second resurrection verified: all namespaces in hierarchy visible in listns() again");
+
+ /* Verify we can reopen via file handle again */
+ reopened_fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
+ if (reopened_fd < 0) {
+ free(handle);
+ close(sock_L3A_fd);
+ close(netns_L3A_fd);
+ TH_LOG("open_by_handle_at failed after second resurrection: %s", strerror(errno));
+ ASSERT_GE(reopened_fd, 0);
+ }
+
+ close(reopened_fd);
+ TH_LOG("File handle test passed: net_L3A can be reopened after second resurrection");
+
+ /* Final cleanup */
+ close(sock_L3A_fd);
+ close(netns_L3A_fd);
+ free(handle);
+}
+
+TEST_HARNESS_MAIN
generated by cgit v1.2.3 (git 2.46.0) at 2025-12-03 07:45:51 +0000