From: Jarkko Sakkinen Date: Tue, 8 May 2012 18:22:30 +0000 (+0300) Subject: x86, realmode: Set permission for real mode pages X-Git-Tag: upstream/snapshot3+hdmi~7339^2~29 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f156ffc439951b63cfa9f4d999a8d54267f13282;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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 Link: http://lkml.kernel.org/r/1336501366-28617-8-git-send-email-jarkko.sakkinen@intel.com Signed-off-by: H. Peter Anvin --- diff --git a/arch/x86/kernel/realmode.c b/arch/x86/kernel/realmode.c index a465775..d85ac20 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; }