Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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selftests/namespaces: verify initial namespace inode numbers

Make sure that all works correctly.

Signed-off-by: Christian Brauner <brauner@kernel.org>

+63 -1
+1
tools/testing/selftests/namespaces/.gitignore
··· 1 1 nsid_test 2 2 file_handle_test 3 + init_ino_test
+1 -1
tools/testing/selftests/namespaces/Makefile
··· 1 1 # SPDX-License-Identifier: GPL-2.0-only 2 2 CFLAGS += -Wall -O0 -g $(KHDR_INCLUDES) $(TOOLS_INCLUDES) 3 3 4 - TEST_GEN_PROGS := nsid_test file_handle_test 4 + TEST_GEN_PROGS := nsid_test file_handle_test init_ino_test 5 5 6 6 include ../lib.mk 7 7
+61
tools/testing/selftests/namespaces/init_ino_test.c
··· 1 + // SPDX-License-Identifier: GPL-2.0-or-later 2 + // Copyright (c) 2025 Christian Brauner <brauner@kernel.org> 3 + 4 + #define _GNU_SOURCE 5 + #include <fcntl.h> 6 + #include <stdio.h> 7 + #include <stdlib.h> 8 + #include <sys/stat.h> 9 + #include <unistd.h> 10 + #include <errno.h> 11 + #include <string.h> 12 + #include <linux/nsfs.h> 13 + 14 + #include "../kselftest_harness.h" 15 + 16 + struct ns_info { 17 + const char *name; 18 + const char *proc_path; 19 + unsigned int expected_ino; 20 + }; 21 + 22 + static struct ns_info namespaces[] = { 23 + { "ipc", "/proc/1/ns/ipc", IPC_NS_INIT_INO }, 24 + { "uts", "/proc/1/ns/uts", UTS_NS_INIT_INO }, 25 + { "user", "/proc/1/ns/user", USER_NS_INIT_INO }, 26 + { "pid", "/proc/1/ns/pid", PID_NS_INIT_INO }, 27 + { "cgroup", "/proc/1/ns/cgroup", CGROUP_NS_INIT_INO }, 28 + { "time", "/proc/1/ns/time", TIME_NS_INIT_INO }, 29 + { "net", "/proc/1/ns/net", NET_NS_INIT_INO }, 30 + { "mnt", "/proc/1/ns/mnt", MNT_NS_INIT_INO }, 31 + }; 32 + 33 + TEST(init_namespace_inodes) 34 + { 35 + struct stat st; 36 + 37 + for (int i = 0; i < sizeof(namespaces) / sizeof(namespaces[0]); i++) { 38 + int ret = stat(namespaces[i].proc_path, &st); 39 + 40 + /* Some namespaces might not be available (e.g., time namespace on older kernels) */ 41 + if (ret < 0) { 42 + if (errno == ENOENT) { 43 + ksft_test_result_skip("%s namespace not available\n", 44 + namespaces[i].name); 45 + continue; 46 + } 47 + ASSERT_GE(ret, 0) 48 + TH_LOG("Failed to stat %s: %s", 49 + namespaces[i].proc_path, strerror(errno)); 50 + } 51 + 52 + ASSERT_EQ(st.st_ino, namespaces[i].expected_ino) 53 + TH_LOG("Namespace %s has inode 0x%lx, expected 0x%x", 54 + namespaces[i].name, st.st_ino, namespaces[i].expected_ino); 55 + 56 + ksft_print_msg("Namespace %s: inode 0x%lx matches expected 0x%x\n", 57 + namespaces[i].name, st.st_ino, namespaces[i].expected_ino); 58 + } 59 + } 60 + 61 + TEST_HARNESS_MAIN