linux-kernel - Re: [PATCH] x86: Dynamically relocate the compat vdso

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Date:	Tue, 11 Mar 2014 14:44:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org
CC:	Stefani Seibold <stefani@...bold.net>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] x86: Dynamically relocate the compat vdso

On 03/11/2014 02:33 PM, Andy Lutomirski wrote:
> diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
> index 1aa9ccd..943f166 100644
> --- a/arch/x86/include/asm/pgtable_types.h
> +++ b/arch/x86/include/asm/pgtable_types.h
> @@ -214,13 +214,8 @@
>  #ifdef CONFIG_X86_64
>  #define __PAGE_KERNEL_IDENT_LARGE_EXEC	__PAGE_KERNEL_LARGE_EXEC
>  #else
> -/*
> - * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
> - * bits are combined, this will alow user to access the high address mapped
> - * VDSO in the presence of CONFIG_COMPAT_VDSO
> - */
>  #define PTE_IDENT_ATTR	 0x003		/* PRESENT+RW */
> -#define PDE_IDENT_ATTR	 0x067		/* PRESENT+RW+USER+DIRTY+ACCESSED */
> +#define PDE_IDENT_ATTR	 0x063		/* PRESENT+RW+USER+DIRTY+ACCESSED */
>  #define PGD_IDENT_ATTR	 0x001		/* PRESENT (no other attributes) */
>  #endif
>  

Please make this hunk a separate patch for bisecting reasons.

	-hpa

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