linux-kernel - Re: [PATCH v2 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

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Date:	Wed, 11 Mar 2015 13:32:33 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andi Kleen <andi@...stfloor.org>, "H. Peter Anvin" <hpa@...or.com>,
	X86 ML <x86@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2 2/2] x86_64,signal: Remove 'fs' and 'gs' from
 sigcontext

On Wed, Mar 11, 2015 at 05:22:48AM -0700, Andy Lutomirski wrote:
> Wait... It looks like it really was saving them.  Of course, this is

Bah, of course. Blind me.

> IOW, in 2.5.63 and earlier, we tried to save and restore TLS state
> across signals, but we did it wrong and would corrupt it for any
> program that used arch_prctl.  At that time, programs could switch
> userspace threads using signals and their TLS pointers would switch.
> In 2.5.64 and later, we broke set_thread_area users, fixed arch_prctl

That is probably non-issue as 2.5 was the devel branch anyway in the old
days. I'm not sure what the statement on breaking ABI was though then...

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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