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Linux 4.10 compat: has_capability()

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Stock kernels older than 4.10 do not export the has_capability()
function which is required by commit e59a377.  To avoid breaking
the build on older kernels revert to the safe legacy behavior and
return EACCES when privileges cannot be checked.

Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #10565
Closes #10573
This commit is contained in:
Brian Behlendorf
2020-07-19 09:56:21 -07:00
committed by GitHub
parent 8fbf432ae2
commit e862b7ecfc
5 changed files with 64 additions and 0 deletions
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config/kernel-userns-capabilities.m4
+29
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@@ -19,6 +19,33 @@ AC_DEFUN([ZFS_AC_KERNEL_NS_CAPABLE], [
])
])
dnl #
dnl # 4.10 API change
dnl # has_capability() was exported.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_HAS_CAPABILITY], [
ZFS_LINUX_TEST_SRC([has_capability], [
#include <linux/capability.h>
],[
struct task_struct *task = NULL;
int cap = 0;
bool result __attribute__ ((unused));
result = has_capability(task, cap);
])
])
AC_DEFUN([ZFS_AC_KERNEL_HAS_CAPABILITY], [
AC_MSG_CHECKING([whether has_capability() is available])
ZFS_LINUX_TEST_RESULT_SYMBOL([has_capability],
[has_capability], [kernel/capability.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_HAS_CAPABILITY, 1, [has_capability() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.39 API change
dnl # struct user_namespace was added to struct cred_t as cred->user_ns member
@@ -66,12 +93,14 @@ AC_DEFUN([ZFS_AC_KERNEL_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
])