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Stop runtime pointer modifications in autotools checks

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c38367c73f was meant to eliminate runtime
function pointer modifications in autotools checks because they were
prone to false negatives on kernels hardened by the PaX project.
Unfortunately, I missed the xattr_handler and super_block->s_bdi
autotools checks. Recent changes to PaX constified
xattr_handler->get/set, which lead me to discover this oversight.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1433
This commit is contained in:
Richard Yao 2013-09-10 15:13:44 -04:00 committed by Brian Behlendorf
parent 4cf652e5d4
commit b83e3e48c9
2 changed files with 24 additions and 16 deletions
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7
config/kernel-bdi.m4
View File

@ -6,9 +6,12 @@ AC_DEFUN([ZFS_AC_KERNEL_BDI], [
AC_MSG_CHECKING([whether super_block has s_bdi]) AC_MSG_CHECKING([whether super_block has s_bdi])
ZFS_LINUX_TRY_COMPILE([ ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h> #include <linux/fs.h>
static const struct super_block
sb __attribute__ ((unused)) {
.s_bdi = NULL,
}
],[ ],[
struct super_block sb __attribute__ ((unused));
sb.s_bdi = NULL;
],[ ],[
AC_MSG_RESULT(yes) AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BDI, 1, [struct super_block has s_bdi]) AC_DEFINE(HAVE_BDI, 1, [struct super_block has s_bdi])

33
config/kernel-xattr-handler.m4
View File

@ -18,10 +18,11 @@ AC_DEFUN([ZFS_AC_KERNEL_CONST_XATTR_HANDLER],
const struct xattr_handler *xattr_handlers[] = { const struct xattr_handler *xattr_handlers[] = {
&xattr_test_handler, &xattr_test_handler,
}; };
],[
struct super_block sb __attribute__ ((unused));
sb.s_xattr = xattr_handlers; const struct super_block sb __attribute__ ((unused)) = {
.s_xattr = xattr_handlers,
};
],[
],[ ],[
AC_MSG_RESULT([yes]) AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_CONST_XATTR_HANDLER, 1, AC_DEFINE(HAVE_CONST_XATTR_HANDLER, 1,
@ -40,12 +41,14 @@ AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_GET], [
AC_MSG_CHECKING([whether xattr_handler->get() wants dentry]) AC_MSG_CHECKING([whether xattr_handler->get() wants dentry])
ZFS_LINUX_TRY_COMPILE([ ZFS_LINUX_TRY_COMPILE([
#include <linux/xattr.h> #include <linux/xattr.h>
],[
int (*get)(struct dentry *dentry, const char *name,
void *buffer, size_t size, int handler_flags) = NULL;
struct xattr_handler xops __attribute__ ((unused));
xops.get = get; int get(struct dentry *dentry, const char *name,
void *buffer, size_t size, int handler_flags) { return 0; }
static const struct xattr_handler
xops __attribute__ ((unused)) = {
.get = get,
};
],[
],[ ],[
AC_MSG_RESULT(yes) AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_DENTRY_XATTR_GET, 1, AC_DEFINE(HAVE_DENTRY_XATTR_GET, 1,
@ -64,13 +67,15 @@ AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_SET], [
AC_MSG_CHECKING([whether xattr_handler->set() wants dentry]) AC_MSG_CHECKING([whether xattr_handler->set() wants dentry])
ZFS_LINUX_TRY_COMPILE([ ZFS_LINUX_TRY_COMPILE([
#include <linux/xattr.h> #include <linux/xattr.h>
],[
int (*set)(struct dentry *dentry, const char *name,
const void *buffer, size_t size, int flags,
int handler_flags) = NULL;
struct xattr_handler xops __attribute__ ((unused));
xops.set = set; int set(struct dentry *dentry, const char *name,
const void *buffer, size_t size, int flags,
int handler_flags) { return 0; }
static const struct xattr_handler
xops __attribute__ ((unused)) = {
.set = set,
};
],[
],[ ],[
AC_MSG_RESULT(yes) AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_DENTRY_XATTR_SET, 1, AC_DEFINE(HAVE_DENTRY_XATTR_SET, 1,