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selftests/namespaces: sixth listns() test

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Test listns() with specific user namespace ID.
Create a user namespace and list namespaces it owns.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-44-2e6f823ebdc0@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 13:20:57 +01:00
parent 4080b9d946
commit bc8da67e0e
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 122 additions and 0 deletions
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122
tools/testing/selftests/namespaces/listns_test.c
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@ -9,6 +9,7 @@
#include <string.h>
#include <linux/nsfs.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
@ -324,4 +325,125 @@ TEST(listns_only_active)
}
}
/*
* Test listns() with specific user namespace ID.
* Create a user namespace and list namespaces it owns.
*/
TEST(listns_specific_userns)
{
struct ns_id_req req = {
.size = sizeof(req),
.spare = 0,
.ns_id = 0,
.ns_type = 0,
.spare2 = 0,
.user_ns_id = 0, /* Will be filled with created userns ID */
};
__u64 ns_ids[100];
int sv[2];
pid_t pid;
int status;
__u64 user_ns_id = 0;
int bytes;
ssize_t ret;
ASSERT_EQ(socketpair(AF_UNIX, SOCK_STREAM, 0, sv), 0);
pid = fork();
ASSERT_GE(pid, 0);
if (pid == 0) {
int fd;
__u64 ns_id;
char buf;
close(sv[0]);
/* Create new user namespace */
if (setup_userns() < 0) {
close(sv[1]);
exit(1);
}
/* Get user namespace ID */
fd = open("/proc/self/ns/user", O_RDONLY);
if (fd < 0) {
close(sv[1]);
exit(1);
}
if (ioctl(fd, NS_GET_ID, &ns_id) < 0) {
close(fd);
close(sv[1]);
exit(1);
}
close(fd);
/* Send ID to parent */
if (write(sv[1], &ns_id, sizeof(ns_id)) != sizeof(ns_id)) {
close(sv[1]);
exit(1);
}
/* Create some namespaces owned by this user namespace */
unshare(CLONE_NEWNET);
unshare(CLONE_NEWUTS);
/* Wait for parent signal */
if (read(sv[1], &buf, 1) != 1) {
close(sv[1]);
exit(1);
}
close(sv[1]);
exit(0);
}
/* Parent */
close(sv[1]);
bytes = read(sv[0], &user_ns_id, sizeof(user_ns_id));
if (bytes != sizeof(user_ns_id)) {
close(sv[0]);
kill(pid, SIGKILL);
waitpid(pid, NULL, 0);
SKIP(return, "Failed to get user namespace ID from child");
}
TH_LOG("Child created user namespace with ID %llu", (unsigned long long)user_ns_id);
/* List namespaces owned by this user namespace */
req.user_ns_id = user_ns_id;
ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
if (ret < 0) {
TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno);
close(sv[0]);
kill(pid, SIGKILL);
waitpid(pid, NULL, 0);
if (errno == ENOSYS) {
SKIP(return, "listns() not supported");
}
ASSERT_GE(ret, 0);
}
TH_LOG("Found %zd namespaces owned by user namespace %llu", ret,
(unsigned long long)user_ns_id);
/* Should find at least the network and UTS namespaces we created */
if (ret > 0) {
for (ssize_t i = 0; i < ret && i < 10; i++)
TH_LOG(" [%zd] ns_id: %llu", i, (unsigned long long)ns_ids[i]);
}
/* Signal child to exit */
if (write(sv[0], "X", 1) != 1) {
close(sv[0]);
kill(pid, SIGKILL);
waitpid(pid, NULL, 0);
ASSERT_TRUE(false);
}
close(sv[0]);
waitpid(pid, &status, 0);
}
TEST_HARNESS_MAIN