linux-kernel - Re: [PATCH v2] x86: Remove compat vdso support

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Date:	Tue, 11 Mar 2014 09:52:39 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefani Seibold <stefani@...bold.net>,
	the arch/x86 maintainers <x86@...nel.org>,
	Dave Jones <davej@...hat.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>
Subject: Re: [PATCH v2] x86: Remove compat vdso support

On 03/11/2014 09:50 AM, Andy Lutomirski wrote:
> Looking forward, would it be reasonable to have an extensible set of
> flags that live in the ELF interpreter's headers somewhere that
> indicate compatibility hacks that the program in question doesn't
> need?  There are at least two things I can think of:
> 
>  - no_compat_vdso32: indicates an interpreter that can load a modern
> non-prelinked vdso
>  - no_vsyscall64: indicates that the libc will not attempt to call
> into the vsyscall page on x86_64.
> 
> I'm sure that there are more.  Think PT_GNU_STACK but for more than
> just the stack.
> 
> If we do something like this, there should probably be a prctl or
> similar that can change some of the flags at runtime, too.
> 

This comes many years too late for this purpose.  Such flags might have
a use, but at this point it is rather meaningless, I think.

	-hpa

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