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selftests/fsmount_ns: add missing TARGETS and fix cap test

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Add missing top-level kselftest TARGETS entries for empty_mntns and
fsmount_ns so that 'make kselftest' discovers and runs these tests.

Fix requires_cap_sys_admin test which always SKIPped because fsopen()
was called after enter_userns(), where CAP_SYS_ADMIN in the mount
namespace's user_ns is unavailable. Move fsopen/fsconfig before fork so
the configured fs_fd is inherited by the child, which then only needs to
call fsmount() after dropping privileges.

Fixes: 3ac7ea91f3 ("selftests: add FSMOUNT_NAMESPACE tests")
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-03-23 17:41:08 +01:00
parent d38aa6cdee
commit 660c09404c
2 changed files with 15 additions and 16 deletions
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2
tools/testing/selftests/Makefile
View File

@@ -39,6 +39,8 @@ TARGETS += filesystems/statmount
TARGETS += filesystems/mount-notify
TARGETS += filesystems/fuse
TARGETS += filesystems/move_mount
TARGETS += filesystems/empty_mntns
TARGETS += filesystems/fsmount_ns
TARGETS += firmware
TARGETS += fpu
TARGETS += ftrace

29
tools/testing/selftests/filesystems/fsmount_ns/fsmount_ns_test.c
View File

@@ -388,12 +388,23 @@ TEST_F(fsmount_ns_caps, requires_cap_sys_admin)
{
pid_t pid;
int status;
int fs_fd;
/*
* Prepare the configured filesystem fd as root before forking.
* fsopen() requires CAP_SYS_ADMIN in the mount namespace's
* user_ns, which won't be available after enter_userns().
*/
fs_fd = sys_fsopen("tmpfs", FSOPEN_CLOEXEC);
ASSERT_GE(fs_fd, 0);
ASSERT_EQ(sys_fsconfig(fs_fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0);
pid = fork();
ASSERT_GE(pid, 0);
if (pid == 0) {
int fs_fd, fd;
int fd;
/* Child: drop privileges using utils.h helper */
if (enter_userns() != 0)
@@ -403,15 +414,6 @@ TEST_F(fsmount_ns_caps, requires_cap_sys_admin)
if (caps_down() == 0)
_exit(3);
fs_fd = sys_fsopen("tmpfs", FSOPEN_CLOEXEC);
if (fs_fd < 0)
_exit(4);
if (sys_fsconfig(fs_fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0) < 0) {
close(fs_fd);
_exit(5);
}
fd = sys_fsmount(fs_fd, FSMOUNT_NAMESPACE | FSMOUNT_CLOEXEC, 0);
close(fs_fd);
@@ -432,6 +434,7 @@ TEST_F(fsmount_ns_caps, requires_cap_sys_admin)
_exit(7);
}
close(fs_fd);
ASSERT_EQ(waitpid(pid, &status, 0), pid);
ASSERT_TRUE(WIFEXITED(status));
@@ -448,12 +451,6 @@ TEST_F(fsmount_ns_caps, requires_cap_sys_admin)
case 3:
SKIP(return, "caps_down failed");
break;
case 4:
SKIP(return, "fsopen failed in userns");
break;
case 5:
SKIP(return, "fsconfig CMD_CREATE failed in userns");
break;
case 6:
SKIP(return, "FSMOUNT_NAMESPACE not supported");
break;