x86, pageattr: Make set_memory_(x|nx) aware of NX support
Make set_memory_x/set_memory_nx directly aware of if NX is supported
in the system or not, rather than requiring that every caller assesses
that support independently.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Tim Starling <tstarling@wikimedia.org>
Cc: Hannes Eder <hannes@hanneseder.net>
LKML-Reference: <1258154897-6770-4-git-send-email-hpa@zytor.com>
Acked-by: Kees Cook <kees.cook@canonical.com>
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index c1c429d..03657e7 100644
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -157,8 +157,7 @@
{
int error;
- if (nx_enabled)
- set_pages_x(image->control_code_page, 1);
+ set_pages_x(image->control_code_page, 1);
error = machine_kexec_alloc_page_tables(image);
if (error)
return error;
@@ -172,8 +171,7 @@
*/
void machine_kexec_cleanup(struct kimage *image)
{
- if (nx_enabled)
- set_pages_nx(image->control_code_page, 1);
+ set_pages_nx(image->control_code_page, 1);
machine_kexec_free_page_tables(image);
}
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 09a140c..1d4eb93 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1085,12 +1085,18 @@
int set_memory_x(unsigned long addr, int numpages)
{
+ if (!(__supported_pte_mask & _PAGE_NX))
+ return 0;
+
return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_NX), 0);
}
EXPORT_SYMBOL(set_memory_x);
int set_memory_nx(unsigned long addr, int numpages)
{
+ if (!(__supported_pte_mask & _PAGE_NX))
+ return 0;
+
return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_NX), 0);
}
EXPORT_SYMBOL(set_memory_nx);