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Date: Tue, 8 May 2012 15:19:09 -0700 From: tip-bot for Jarkko Sakkinen <jarkko.sakkinen@...el.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, jarkko.sakkinen@...el.com, tglx@...utronix.de, hpa@...ux.intel.com Subject: [tip:x86/trampoline] x86, realmode: Set permission for real mode pages Commit-ID: f156ffc439951b63cfa9f4d999a8d54267f13282 Gitweb: http://git.kernel.org/tip/f156ffc439951b63cfa9f4d999a8d54267f13282 Author: Jarkko Sakkinen <jarkko.sakkinen@...el.com> AuthorDate: Tue, 8 May 2012 21:22:30 +0300 Committer: H. Peter Anvin <hpa@...ux.intel.com> CommitDate: Tue, 8 May 2012 11:47:08 -0700 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@...el.com> Link: http://lkml.kernel.org/r/1336501366-28617-8-git-send-email-jarkko.sakkinen@intel.com Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com> --- 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 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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