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x86, pageattr: Make set_memory_(x|nx) aware of NX support

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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>
This commit is contained in:
H. Peter Anvin 2009-11-13 15:28:15 -08:00
parent a7c4c0d934
commit 583140afb9
2 changed files with 8 additions and 4 deletions
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6
arch/x86/kernel/machine_kexec_32.c
View File

@ -157,8 +157,7 @@ int machine_kexec_prepare(struct kimage *image)
{ {
int error; 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); error = machine_kexec_alloc_page_tables(image);
if (error) if (error)
return error; return error;
@ -172,8 +171,7 @@ int machine_kexec_prepare(struct kimage *image)
*/ */
void machine_kexec_cleanup(struct kimage *image) 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); machine_kexec_free_page_tables(image);
} }

6
arch/x86/mm/pageattr.c
View File

@ -1085,12 +1085,18 @@ EXPORT_SYMBOL(set_memory_array_wb);
int set_memory_x(unsigned long addr, int numpages) 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); return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_NX), 0);
} }
EXPORT_SYMBOL(set_memory_x); EXPORT_SYMBOL(set_memory_x);
int set_memory_nx(unsigned long addr, int numpages) 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); return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_NX), 0);
} }
EXPORT_SYMBOL(set_memory_nx); EXPORT_SYMBOL(set_memory_nx);