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selftests/namespaces: first listns() test

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Test basic listns() functionality with the unified namespace tree.
List all active namespaces globally.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-39-2e6f823ebdc0@kernel.org
Tested-by: syzbot@syzkaller.appspotmail.com
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 13:20:52 +01:00
parent 158c5c786e
commit e2ff8d8864
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GPG Key ID: 91C61BC06578DCA2
3 changed files with 60 additions and 1 deletions
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1
tools/testing/selftests/namespaces/.gitignore vendored
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@ -2,3 +2,4 @@ nsid_test
file_handle_test
init_ino_test
ns_active_ref_test
listns_test

3
tools/testing/selftests/namespaces/Makefile
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@ -2,9 +2,10 @@
CFLAGS += -Wall -O0 -g $(KHDR_INCLUDES) $(TOOLS_INCLUDES)
LDLIBS += -lcap
TEST_GEN_PROGS := nsid_test file_handle_test init_ino_test ns_active_ref_test
TEST_GEN_PROGS := nsid_test file_handle_test init_ino_test ns_active_ref_test listns_test
include ../lib.mk
$(OUTPUT)/ns_active_ref_test: ../filesystems/utils.c
$(OUTPUT)/listns_test: ../filesystems/utils.c

57
tools/testing/selftests/namespaces/listns_test.c Normal file
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@ -0,0 +1,57 @@
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/nsfs.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "../kselftest_harness.h"
#include "../filesystems/utils.h"
#include "wrappers.h"
/*
* Test basic listns() functionality with the unified namespace tree.
* List all active namespaces globally.
*/
TEST(listns_basic_unified)
{
struct ns_id_req req = {
.size = sizeof(req),
.spare = 0,
.ns_id = 0,
.ns_type = 0, /* All types */
.spare2 = 0,
.user_ns_id = 0, /* Global listing */
};
__u64 ns_ids[100];
ssize_t ret;
ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
if (ret < 0) {
if (errno == ENOSYS)
SKIP(return, "listns() not supported");
TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno);
ASSERT_TRUE(false);
}
/* Should find at least the initial namespaces */
ASSERT_GT(ret, 0);
TH_LOG("Found %zd active namespaces", ret);
/* Verify all returned IDs are non-zero */
for (ssize_t i = 0; i < ret; i++) {
ASSERT_NE(ns_ids[i], 0);
TH_LOG(" [%zd] ns_id: %llu", i, (unsigned long long)ns_ids[i]);
}
}
TEST_HARNESS_MAIN