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selftests/namespaces: fifth active reference count tests

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Test PID namespace active ref tracking

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-27-2e6f823ebdc0@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-10-29 13:20:40 +01:00
parent 28655ff253
commit c4803b255f
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 82 additions and 0 deletions
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82
tools/testing/selftests/namespaces/ns_active_ref_test.c
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@ -366,4 +366,86 @@ TEST(userns_active_ref_lifecycle)
ASSERT_TRUE(errno == ENOENT || errno == ESTALE);
}
/*
* Test PID namespace active ref tracking
*/
TEST(pidns_active_ref_lifecycle)
{
struct file_handle *handle;
int mount_id;
int ret;
int fd;
int pipefd[2];
pid_t pid;
int status;
char buf[sizeof(*handle) + MAX_HANDLE_SZ];
ASSERT_EQ(pipe(pipefd), 0);
pid = fork();
ASSERT_GE(pid, 0);
if (pid == 0) {
/* Child process */
close(pipefd[0]);
/* Create new PID namespace */
ret = unshare(CLONE_NEWPID);
if (ret < 0) {
close(pipefd[1]);
exit(1);
}
/* Fork to actually enter the PID namespace */
pid_t child = fork();
if (child < 0) {
close(pipefd[1]);
exit(1);
}
if (child == 0) {
/* Grandchild - in new PID namespace */
fd = open("/proc/self/ns/pid", O_RDONLY);
if (fd < 0) {
exit(1);
}
handle = (struct file_handle *)buf;
handle->handle_bytes = MAX_HANDLE_SZ;
ret = name_to_handle_at(fd, "", handle, &mount_id, AT_EMPTY_PATH);
close(fd);
if (ret < 0) {
exit(1);
}
/* Send handle to grandparent */
write(pipefd[1], buf, sizeof(*handle) + handle->handle_bytes);
close(pipefd[1]);
exit(0);
}
/* Wait for grandchild */
waitpid(child, NULL, 0);
exit(0);
}
/* Parent */
close(pipefd[1]);
ret = read(pipefd[0], buf, sizeof(buf));
close(pipefd[0]);
waitpid(pid, &status, 0);
ASSERT_TRUE(WIFEXITED(status));
ASSERT_EQ(WEXITSTATUS(status), 0);
ASSERT_GT(ret, 0);
handle = (struct file_handle *)buf;
/* Namespace should be inactive after all processes exit */
fd = open_by_handle_at(FD_NSFS_ROOT, handle, O_RDONLY);
ASSERT_LT(fd, 0);
ASSERT_TRUE(errno == ENOENT || errno == ESTALE);
}
TEST_HARNESS_MAIN