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| author | Jarkko Sakkinen <jarkko.sakkinen@intel.com> | 2012-05-08 22:22:30 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-08 22:47:08 +0400 |
| commit | f156ffc439951b63cfa9f4d999a8d54267f13282 (patch) | |
| tree | b12b7b41f7fef18eb9ead4ed4419b5ab6fb14900 | |
| parent | c9b77ccb52a5c77233b0e557b7d4417b00ef4012 (diff) | |
| download | linux-f156ffc439951b63cfa9f4d999a8d54267f13282.tar.xz | |
x86, realmode: Set permission for real mode pages
Set proper permissions for rodata, text and data, removing the
realmode trampoline area as a remaining RWX memory mapping in the
kernel.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-8-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| -rw-r--r-- | arch/x86/kernel/realmode.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/x86/kernel/realmode.c b/arch/x86/kernel/realmode.c index a465775b32f2..d85ac20bb4eb 100644 --- a/arch/x86/kernel/realmode.c +++ b/arch/x86/kernel/realmode.c @@ -86,7 +86,21 @@ static int __init set_real_mode_permissions(void) PAGE_ALIGN(real_mode_header.end) - __pa(real_mode_base); - set_memory_x((unsigned long) real_mode_base, all_size >> PAGE_SHIFT); + size_t ro_size = + PAGE_ALIGN(real_mode_header.ro_end) - + __pa(real_mode_base); + + size_t text_size = + PAGE_ALIGN(real_mode_header.ro_end) - + real_mode_header.text_start; + + unsigned long text_start = + (unsigned long) __va(real_mode_header.text_start); + + set_memory_nx((unsigned long) real_mode_base, all_size >> PAGE_SHIFT); + set_memory_ro((unsigned long) real_mode_base, ro_size >> PAGE_SHIFT); + set_memory_x((unsigned long) text_start, text_size >> PAGE_SHIFT); + return 0; } |