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x86, realmode: Set permission for real mode pages

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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>
This commit is contained in:
Jarkko Sakkinen 2012-05-08 21:22:30 +03:00 committed by H. Peter Anvin
parent c9b77ccb52
commit f156ffc439
1 changed files with 15 additions and 1 deletions
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16
arch/x86/kernel/realmode.c
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@ -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;
}