config/kernel-userns-capabilities.m4

   1 dnl #
   2 dnl # 2.6.38 API change
   3 dnl # ns_capable() was introduced
   4 dnl #
   5 AC_DEFUN([ZFS_AC_KERNEL_SRC_NS_CAPABLE], [
   6         ZFS_LINUX_TEST_SRC([ns_capable], [
   7                 #include <linux/capability.h>
   8         ],[
   9                 ns_capable((struct user_namespace *)NULL, CAP_SYS_ADMIN);
  10         ])
  11 ])
  12
  13 AC_DEFUN([ZFS_AC_KERNEL_NS_CAPABLE], [
  14         AC_MSG_CHECKING([whether ns_capable exists])
  15         ZFS_LINUX_TEST_RESULT([ns_capable], [
  16                 AC_MSG_RESULT(yes)
  17         ],[
  18                 ZFS_LINUX_TEST_ERROR([ns_capable()])
  19         ])
  20 ])
  21
  22 dnl #
  23 dnl # 2.6.39 API change
  24 dnl # struct user_namespace was added to struct cred_t as cred->user_ns member
  25 dnl #
  26 AC_DEFUN([ZFS_AC_KERNEL_SRC_CRED_USER_NS], [
  27         ZFS_LINUX_TEST_SRC([cred_user_ns], [
  28                 #include <linux/cred.h>
  29         ],[
  30                 struct cred cr;
  31                 cr.user_ns = (struct user_namespace *)NULL;
  32         ])
  33 ])
  34
  35 AC_DEFUN([ZFS_AC_KERNEL_CRED_USER_NS], [
  36         AC_MSG_CHECKING([whether cred_t->user_ns exists])
  37         ZFS_LINUX_TEST_RESULT([cred_user_ns], [
  38                 AC_MSG_RESULT(yes)
  39         ],[
  40                 ZFS_LINUX_TEST_ERROR([cred_t->user_ns()])
  41         ])
  42 ])
  43
  44 dnl #
  45 dnl # 3.4 API change
  46 dnl # kuid_has_mapping() and kgid_has_mapping() were added to distinguish
  47 dnl # between internal kernel uids/gids and user namespace uids/gids.
  48 dnl #
  49 AC_DEFUN([ZFS_AC_KERNEL_SRC_KUID_HAS_MAPPING], [
  50         ZFS_LINUX_TEST_SRC([kuid_has_mapping], [
  51                 #include <linux/uidgid.h>
  52         ],[
  53                 kuid_has_mapping((struct user_namespace *)NULL, KUIDT_INIT(0));
  54                 kgid_has_mapping((struct user_namespace *)NULL, KGIDT_INIT(0));
  55         ])
  56 ])
  57
  58 AC_DEFUN([ZFS_AC_KERNEL_KUID_HAS_MAPPING], [
  59         AC_MSG_CHECKING([whether kuid_has_mapping/kgid_has_mapping exist])
  60         ZFS_LINUX_TEST_RESULT([kuid_has_mapping], [
  61                 AC_MSG_RESULT(yes)
  62         ],[
  63                 ZFS_LINUX_TEST_ERROR([kuid_has_mapping()])
  64         ])
  65 ])
  66
  67 AC_DEFUN([ZFS_AC_KERNEL_SRC_USERNS_CAPABILITIES], [
  68         ZFS_AC_KERNEL_SRC_NS_CAPABLE
  69         ZFS_AC_KERNEL_SRC_HAS_CAPABILITY
  70         ZFS_AC_KERNEL_SRC_CRED_USER_NS
  71         ZFS_AC_KERNEL_SRC_KUID_HAS_MAPPING
  72 ])
  73
  74 AC_DEFUN([ZFS_AC_KERNEL_USERNS_CAPABILITIES], [
  75         ZFS_AC_KERNEL_NS_CAPABLE
  76         ZFS_AC_KERNEL_HAS_CAPABILITY
  77         ZFS_AC_KERNEL_CRED_USER_NS
  78         ZFS_AC_KERNEL_KUID_HAS_MAPPING
  79 ])