x86, realmode: Set permission for real mode pages (f156ffc4) · Commits · 戴 / test

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>

arch/x86/kernel/realmode.c

+15 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}

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