mirror of https://github.com/torvalds/linux.git
selftests/namespaces: tenth active reference count tests
Test multiple children sharing same parent. Parent should stay active as long as ANY child is active. Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-32-2e6f823ebdc0@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
a8ce47a1ac
commit
e7585a9ef5
|
|
@ -1106,4 +1106,174 @@ TEST(ns_multilevel_hierarchy)
|
||||||
close(gp_fd);
|
close(gp_fd);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Test multiple children sharing same parent.
|
||||||
|
* Parent should stay active as long as ANY child is active.
|
||||||
|
*/
|
||||||
|
TEST(ns_multiple_children_same_parent)
|
||||||
|
{
|
||||||
|
struct file_handle *p_handle, *c1_handle, *c2_handle;
|
||||||
|
int ret, pipefd[2];
|
||||||
|
pid_t pid;
|
||||||
|
int status;
|
||||||
|
__u64 p_id, c1_id, c2_id;
|
||||||
|
char p_buf[sizeof(*p_handle) + MAX_HANDLE_SZ];
|
||||||
|
char c1_buf[sizeof(*c1_handle) + MAX_HANDLE_SZ];
|
||||||
|
char c2_buf[sizeof(*c2_handle) + MAX_HANDLE_SZ];
|
||||||
|
|
||||||
|
ASSERT_EQ(pipe(pipefd), 0);
|
||||||
|
pid = fork();
|
||||||
|
ASSERT_GE(pid, 0);
|
||||||
|
|
||||||
|
if (pid == 0) {
|
||||||
|
close(pipefd[0]);
|
||||||
|
|
||||||
|
/* Create parent user namespace */
|
||||||
|
if (setup_userns() < 0) {
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
int p_fd = open("/proc/self/ns/user", O_RDONLY);
|
||||||
|
if (p_fd < 0) {
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
if (ioctl(p_fd, NS_GET_ID, &p_id) < 0) {
|
||||||
|
close(p_fd);
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
close(p_fd);
|
||||||
|
|
||||||
|
/* Create first child user namespace */
|
||||||
|
if (setup_userns() < 0) {
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
int c1_fd = open("/proc/self/ns/user", O_RDONLY);
|
||||||
|
if (c1_fd < 0) {
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
if (ioctl(c1_fd, NS_GET_ID, &c1_id) < 0) {
|
||||||
|
close(c1_fd);
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
close(c1_fd);
|
||||||
|
|
||||||
|
/* Return to parent user namespace and create second child */
|
||||||
|
/* We can't actually do this easily, so let's create a sibling namespace
|
||||||
|
* by creating a network namespace instead */
|
||||||
|
if (unshare(CLONE_NEWNET) < 0) {
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
int c2_fd = open("/proc/self/ns/net", O_RDONLY);
|
||||||
|
if (c2_fd < 0) {
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
if (ioctl(c2_fd, NS_GET_ID, &c2_id) < 0) {
|
||||||
|
close(c2_fd);
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
close(c2_fd);
|
||||||
|
|
||||||
|
/* Send all namespace IDs */
|
||||||
|
write(pipefd[1], &p_id, sizeof(p_id));
|
||||||
|
write(pipefd[1], &c1_id, sizeof(c1_id));
|
||||||
|
write(pipefd[1], &c2_id, sizeof(c2_id));
|
||||||
|
close(pipefd[1]);
|
||||||
|
exit(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
close(pipefd[1]);
|
||||||
|
|
||||||
|
/* Read all three namespace IDs - fixed size, no parsing needed */
|
||||||
|
ret = read(pipefd[0], &p_id, sizeof(p_id));
|
||||||
|
if (ret != sizeof(p_id)) {
|
||||||
|
close(pipefd[0]);
|
||||||
|
waitpid(pid, NULL, 0);
|
||||||
|
SKIP(return, "Failed to read parent namespace ID");
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = read(pipefd[0], &c1_id, sizeof(c1_id));
|
||||||
|
if (ret != sizeof(c1_id)) {
|
||||||
|
close(pipefd[0]);
|
||||||
|
waitpid(pid, NULL, 0);
|
||||||
|
SKIP(return, "Failed to read first child namespace ID");
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = read(pipefd[0], &c2_id, sizeof(c2_id));
|
||||||
|
close(pipefd[0]);
|
||||||
|
if (ret != sizeof(c2_id)) {
|
||||||
|
waitpid(pid, NULL, 0);
|
||||||
|
SKIP(return, "Failed to read second child namespace ID");
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Construct file handles from namespace IDs */
|
||||||
|
p_handle = (struct file_handle *)p_buf;
|
||||||
|
p_handle->handle_bytes = sizeof(struct nsfs_file_handle);
|
||||||
|
p_handle->handle_type = FILEID_NSFS;
|
||||||
|
struct nsfs_file_handle *p_fh = (struct nsfs_file_handle *)p_handle->f_handle;
|
||||||
|
p_fh->ns_id = p_id;
|
||||||
|
p_fh->ns_type = 0;
|
||||||
|
p_fh->ns_inum = 0;
|
||||||
|
|
||||||
|
c1_handle = (struct file_handle *)c1_buf;
|
||||||
|
c1_handle->handle_bytes = sizeof(struct nsfs_file_handle);
|
||||||
|
c1_handle->handle_type = FILEID_NSFS;
|
||||||
|
struct nsfs_file_handle *c1_fh = (struct nsfs_file_handle *)c1_handle->f_handle;
|
||||||
|
c1_fh->ns_id = c1_id;
|
||||||
|
c1_fh->ns_type = 0;
|
||||||
|
c1_fh->ns_inum = 0;
|
||||||
|
|
||||||
|
c2_handle = (struct file_handle *)c2_buf;
|
||||||
|
c2_handle->handle_bytes = sizeof(struct nsfs_file_handle);
|
||||||
|
c2_handle->handle_type = FILEID_NSFS;
|
||||||
|
struct nsfs_file_handle *c2_fh = (struct nsfs_file_handle *)c2_handle->f_handle;
|
||||||
|
c2_fh->ns_id = c2_id;
|
||||||
|
c2_fh->ns_type = 0;
|
||||||
|
c2_fh->ns_inum = 0;
|
||||||
|
|
||||||
|
/* Open both children before process exits */
|
||||||
|
int c1_fd = open_by_handle_at(FD_NSFS_ROOT, c1_handle, O_RDONLY);
|
||||||
|
int c2_fd = open_by_handle_at(FD_NSFS_ROOT, c2_handle, O_RDONLY);
|
||||||
|
|
||||||
|
if (c1_fd < 0 || c2_fd < 0) {
|
||||||
|
if (c1_fd >= 0) close(c1_fd);
|
||||||
|
if (c2_fd >= 0) close(c2_fd);
|
||||||
|
waitpid(pid, NULL, 0);
|
||||||
|
SKIP(return, "Failed to open child namespaces");
|
||||||
|
}
|
||||||
|
|
||||||
|
waitpid(pid, &status, 0);
|
||||||
|
ASSERT_TRUE(WIFEXITED(status));
|
||||||
|
ASSERT_EQ(WEXITSTATUS(status), 0);
|
||||||
|
|
||||||
|
/* Parent should be active (both children active) */
|
||||||
|
TH_LOG("Both children active - parent should be active");
|
||||||
|
int p_fd = open_by_handle_at(FD_NSFS_ROOT, p_handle, O_RDONLY);
|
||||||
|
ASSERT_GE(p_fd, 0);
|
||||||
|
close(p_fd);
|
||||||
|
|
||||||
|
/* Close first child - parent should STILL be active */
|
||||||
|
TH_LOG("Closing first child - parent should still be active");
|
||||||
|
close(c1_fd);
|
||||||
|
p_fd = open_by_handle_at(FD_NSFS_ROOT, p_handle, O_RDONLY);
|
||||||
|
ASSERT_GE(p_fd, 0);
|
||||||
|
close(p_fd);
|
||||||
|
|
||||||
|
/* Close second child - NOW parent should become inactive */
|
||||||
|
TH_LOG("Closing second child - parent should become inactive");
|
||||||
|
close(c2_fd);
|
||||||
|
p_fd = open_by_handle_at(FD_NSFS_ROOT, p_handle, O_RDONLY);
|
||||||
|
ASSERT_LT(p_fd, 0);
|
||||||
|
}
|
||||||
|
|
||||||
TEST_HARNESS_MAIN
|
TEST_HARNESS_MAIN
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue