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Linux 6.18: namespace type moved to ns_common

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The namespace type has moved from the namespace ops struct to the
"common" base namespace struct. Detect this and define a macro that does
the right thing for both versions.

Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Rob Norris <robn@despairlabs.com>
This commit is contained in:
Rob Norris 2025-09-29 09:16:36 +10:00 committed by Tony Hutter
parent 005c631499
commit 2778832e22
4 changed files with 51 additions and 80 deletions
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31
config/kernel-namespace.m4 Normal file
View File

@ -0,0 +1,31 @@
dnl #
dnl # 6.18 API change
dnl # ns->ops->type was moved to ns->ns.ns_type (struct ns_common)
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_NS_COMMON_TYPE], [
ZFS_LINUX_TEST_SRC([ns_common_type], [
#include <linux/user_namespace.h>
],[
struct user_namespace ns;
ns.ns.ns_type = 0;
])
])
AC_DEFUN([ZFS_AC_KERNEL_NS_COMMON_TYPE], [
AC_MSG_CHECKING([whether ns_type is accessible through ns_common])
ZFS_LINUX_TEST_RESULT([ns_common_type], [
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_NS_COMMON_TYPE], 1,
[Define if ns_type is accessible through ns_common])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_NAMESPACE], [
ZFS_AC_KERNEL_SRC_NS_COMMON_TYPE
])
AC_DEFUN([ZFS_AC_KERNEL_NAMESPACE], [
ZFS_AC_KERNEL_NS_COMMON_TYPE
])

79
config/kernel-userns-capabilities.m4
View File

@ -1,79 +0,0 @@
dnl #
dnl # 2.6.38 API change
dnl # ns_capable() was introduced
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_NS_CAPABLE], [
ZFS_LINUX_TEST_SRC([ns_capable], [
#include <linux/capability.h>
],[
ns_capable((struct user_namespace *)NULL, CAP_SYS_ADMIN);
])
])
AC_DEFUN([ZFS_AC_KERNEL_NS_CAPABLE], [
AC_MSG_CHECKING([whether ns_capable exists])
ZFS_LINUX_TEST_RESULT([ns_capable], [
AC_MSG_RESULT(yes)
],[
ZFS_LINUX_TEST_ERROR([ns_capable()])
])
])
dnl #
dnl # 2.6.39 API change
dnl # struct user_namespace was added to struct cred_t as cred->user_ns member
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_CRED_USER_NS], [
ZFS_LINUX_TEST_SRC([cred_user_ns], [
#include <linux/cred.h>
],[
struct cred cr;
cr.user_ns = (struct user_namespace *)NULL;
])
])
AC_DEFUN([ZFS_AC_KERNEL_CRED_USER_NS], [
AC_MSG_CHECKING([whether cred_t->user_ns exists])
ZFS_LINUX_TEST_RESULT([cred_user_ns], [
AC_MSG_RESULT(yes)
],[
ZFS_LINUX_TEST_ERROR([cred_t->user_ns()])
])
])
dnl #
dnl # 3.4 API change
dnl # kuid_has_mapping() and kgid_has_mapping() were added to distinguish
dnl # between internal kernel uids/gids and user namespace uids/gids.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_KUID_HAS_MAPPING], [
ZFS_LINUX_TEST_SRC([kuid_has_mapping], [
#include <linux/uidgid.h>
],[
kuid_has_mapping((struct user_namespace *)NULL, KUIDT_INIT(0));
kgid_has_mapping((struct user_namespace *)NULL, KGIDT_INIT(0));
])
])
AC_DEFUN([ZFS_AC_KERNEL_KUID_HAS_MAPPING], [
AC_MSG_CHECKING([whether kuid_has_mapping/kgid_has_mapping exist])
ZFS_LINUX_TEST_RESULT([kuid_has_mapping], [
AC_MSG_RESULT(yes)
],[
ZFS_LINUX_TEST_ERROR([kuid_has_mapping()])
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_USERNS_CAPABILITIES], [
ZFS_AC_KERNEL_SRC_NS_CAPABLE
ZFS_AC_KERNEL_SRC_HAS_CAPABILITY
ZFS_AC_KERNEL_SRC_CRED_USER_NS
ZFS_AC_KERNEL_SRC_KUID_HAS_MAPPING
])
AC_DEFUN([ZFS_AC_KERNEL_USERNS_CAPABILITIES], [
ZFS_AC_KERNEL_NS_CAPABLE
ZFS_AC_KERNEL_HAS_CAPABILITY
ZFS_AC_KERNEL_CRED_USER_NS
ZFS_AC_KERNEL_KUID_HAS_MAPPING
])

2
config/kernel.m4
View File

@ -136,6 +136,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_TIMER
ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_WB_ERR
ZFS_AC_KERNEL_SRC_SOPS_FREE_INODE
ZFS_AC_KERNEL_SRC_NAMESPACE
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
@ -256,6 +257,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_TIMER
ZFS_AC_KERNEL_SUPER_BLOCK_S_WB_ERR
ZFS_AC_KERNEL_SOPS_FREE_INODE
ZFS_AC_KERNEL_NAMESPACE
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_CPU_HAS_FEATURE

19
module/os/linux/spl/spl-zone.c
View File

@ -25,6 +25,10 @@
* SUCH DAMAGE.
*/
/*
* Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
*/
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/kmem.h>
@ -56,6 +60,19 @@ typedef struct zone_dataset {
} zone_dataset_t;
#ifdef CONFIG_USER_NS
/*
* Linux 6.18 moved the generic namespace type away from ns->ops->type onto
* ns_common itself.
*/
#ifdef HAVE_NS_COMMON_TYPE
#define ns_is_newuser(ns) \
((ns)->ns_type == CLONE_NEWUSER)
#else
#define ns_is_newuser(ns) \
((ns)->ops != NULL && (ns)->ops->type == CLONE_NEWUSER)
#endif
/*
* Returns:
* - 0 on success
@ -84,7 +101,7 @@ user_ns_get(int fd, struct user_namespace **userns)
goto done;
}
ns = get_proc_ns(file_inode(nsfile));
if (ns->ops->type != CLONE_NEWUSER) {
if (!ns_is_newuser(ns)) {
error = ENOTTY;
goto done;
}