diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2009-11-14 00:28:15 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-11-16 22:44:58 +0100 |
| commit | 583140afb989f24d115e80be5c91e503b58ccfc0 (patch) | |
| tree | 2ac772e0a5ac6e4e50249a403c0a272794912957 /arch | |
| parent | x86, sleep: Always save the value of EFER (diff) | |
| download | linux-583140afb989f24d115e80be5c91e503b58ccfc0.tar.xz linux-583140afb989f24d115e80be5c91e503b58ccfc0.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/machine_kexec_32.c | 6 | ||||
| -rw-r--r-- | arch/x86/mm/pageattr.c | 6 |
2 files changed, 8 insertions, 4 deletions
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c index c1c429d00130..03657e784fd8 100644 --- a/arch/x86/kernel/machine_kexec_32.c +++ b/arch/x86/kernel/machine_kexec_32.c @@ -157,8 +157,7 @@ int machine_kexec_prepare(struct kimage *image) { 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 @@ int machine_kexec_prepare(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); } diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 09a140ca7be8..1d4eb93d333c 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -1085,12 +1085,18 @@ EXPORT_SYMBOL(set_memory_array_wb); 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); |