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selftests/namespaces: eleventh active reference count tests

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Test that different namespace types with same owner all contribute
active references to the owning user namespace.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-33-2e6f823ebdc0@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 13:20:46 +01:00
parent e7585a9ef5
commit 26d238ea6a
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 171 additions and 0 deletions
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171
tools/testing/selftests/namespaces/ns_active_ref_test.c
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@ -1276,4 +1276,175 @@ TEST(ns_multiple_children_same_parent)
ASSERT_LT(p_fd, 0);
}
/*
* Test that different namespace types with same owner all contribute
* active references to the owning user namespace.
*/
TEST(ns_different_types_same_owner)
{
struct file_handle *u_handle, *n_handle, *ut_handle;
int ret, pipefd[2];
pid_t pid;
int status;
__u64 u_id, n_id, ut_id;
char u_buf[sizeof(*u_handle) + MAX_HANDLE_SZ];
char n_buf[sizeof(*n_handle) + MAX_HANDLE_SZ];
char ut_buf[sizeof(*ut_handle) + MAX_HANDLE_SZ];
ASSERT_EQ(pipe(pipefd), 0);
pid = fork();
ASSERT_GE(pid, 0);
if (pid == 0) {
close(pipefd[0]);
/* Create user namespace */
if (setup_userns() < 0) {
close(pipefd[1]);
exit(1);
}
int u_fd = open("/proc/self/ns/user", O_RDONLY);
if (u_fd < 0) {
close(pipefd[1]);
exit(1);
}
if (ioctl(u_fd, NS_GET_ID, &u_id) < 0) {
close(u_fd);
close(pipefd[1]);
exit(1);
}
close(u_fd);
/* Create network namespace (owned by user namespace) */
if (unshare(CLONE_NEWNET) < 0) {
close(pipefd[1]);
exit(1);
}
int n_fd = open("/proc/self/ns/net", O_RDONLY);
if (n_fd < 0) {
close(pipefd[1]);
exit(1);
}
if (ioctl(n_fd, NS_GET_ID, &n_id) < 0) {
close(n_fd);
close(pipefd[1]);
exit(1);
}
close(n_fd);
/* Create UTS namespace (also owned by user namespace) */
if (unshare(CLONE_NEWUTS) < 0) {
close(pipefd[1]);
exit(1);
}
int ut_fd = open("/proc/self/ns/uts", O_RDONLY);
if (ut_fd < 0) {
close(pipefd[1]);
exit(1);
}
if (ioctl(ut_fd, NS_GET_ID, &ut_id) < 0) {
close(ut_fd);
close(pipefd[1]);
exit(1);
}
close(ut_fd);
/* Send all namespace IDs */
write(pipefd[1], &u_id, sizeof(u_id));
write(pipefd[1], &n_id, sizeof(n_id));
write(pipefd[1], &ut_id, sizeof(ut_id));
close(pipefd[1]);
exit(0);
}
close(pipefd[1]);
/* Read all three namespace IDs - fixed size, no parsing needed */
ret = read(pipefd[0], &u_id, sizeof(u_id));
if (ret != sizeof(u_id)) {
close(pipefd[0]);
waitpid(pid, NULL, 0);
SKIP(return, "Failed to read user namespace ID");
}
ret = read(pipefd[0], &n_id, sizeof(n_id));
if (ret != sizeof(n_id)) {
close(pipefd[0]);
waitpid(pid, NULL, 0);
SKIP(return, "Failed to read network namespace ID");
}
ret = read(pipefd[0], &ut_id, sizeof(ut_id));
close(pipefd[0]);
if (ret != sizeof(ut_id)) {
waitpid(pid, NULL, 0);
SKIP(return, "Failed to read UTS namespace ID");
}
/* Construct file handles from namespace IDs */
u_handle = (struct file_handle *)u_buf;
u_handle->handle_bytes = sizeof(struct nsfs_file_handle);
u_handle->handle_type = FILEID_NSFS;
struct nsfs_file_handle *u_fh = (struct nsfs_file_handle *)u_handle->f_handle;
u_fh->ns_id = u_id;
u_fh->ns_type = 0;
u_fh->ns_inum = 0;
n_handle = (struct file_handle *)n_buf;
n_handle->handle_bytes = sizeof(struct nsfs_file_handle);
n_handle->handle_type = FILEID_NSFS;
struct nsfs_file_handle *n_fh = (struct nsfs_file_handle *)n_handle->f_handle;
n_fh->ns_id = n_id;
n_fh->ns_type = 0;
n_fh->ns_inum = 0;
ut_handle = (struct file_handle *)ut_buf;
ut_handle->handle_bytes = sizeof(struct nsfs_file_handle);
ut_handle->handle_type = FILEID_NSFS;
struct nsfs_file_handle *ut_fh = (struct nsfs_file_handle *)ut_handle->f_handle;
ut_fh->ns_id = ut_id;
ut_fh->ns_type = 0;
ut_fh->ns_inum = 0;
/* Open both non-user namespaces before process exits */
int n_fd = open_by_handle_at(FD_NSFS_ROOT, n_handle, O_RDONLY);
int ut_fd = open_by_handle_at(FD_NSFS_ROOT, ut_handle, O_RDONLY);
if (n_fd < 0 || ut_fd < 0) {
if (n_fd >= 0) close(n_fd);
if (ut_fd >= 0) close(ut_fd);
waitpid(pid, NULL, 0);
SKIP(return, "Failed to open namespaces");
}
waitpid(pid, &status, 0);
ASSERT_TRUE(WIFEXITED(status));
ASSERT_EQ(WEXITSTATUS(status), 0);
/*
* Both network and UTS namespaces are active.
* User namespace should be active (gets 2 active refs).
*/
TH_LOG("Both net and uts active - user namespace should be active");
int u_fd = open_by_handle_at(FD_NSFS_ROOT, u_handle, O_RDONLY);
ASSERT_GE(u_fd, 0);
close(u_fd);
/* Close network namespace - user namespace should STILL be active */
TH_LOG("Closing network ns - user ns should still be active (uts still active)");
close(n_fd);
u_fd = open_by_handle_at(FD_NSFS_ROOT, u_handle, O_RDONLY);
ASSERT_GE(u_fd, 0);
close(u_fd);
/* Close UTS namespace - user namespace should become inactive */
TH_LOG("Closing uts ns - user ns should become inactive");
close(ut_fd);
u_fd = open_by_handle_at(FD_NSFS_ROOT, u_handle, O_RDONLY);
ASSERT_LT(u_fd, 0);
}
TEST_HARNESS_MAIN