linux-kernel - Re: pt_regs leak into userspace (was Re: [PATCH v3 20/71] ARC: Signal handling)

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Date:	Fri, 15 Feb 2013 13:05:00 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Jonas Bonn <jonas.bonn@...il.com>
CC:	Al Viro <viro@...iv.linux.org.uk>, Arnd Bergmann <arnd@...db.de>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: pt_regs leak into userspace (was Re: [PATCH v3 20/71] ARC: Signal
 handling)

On Friday 15 February 2013 12:53 PM, Jonas Bonn wrote:
> On 11 February 2013 15:07, Al Viro <viro@...iv.linux.org.uk> wrote:
>
>> I'd suggest asking itanic folks; they do *not* put callee-saved stuff into
>> sigcontext.  AFAICS, they don't have setcontext() implemented as a syscall
>> at all - it's done as sigprocmask() + doing to callee-saved registers what
>> longjmp() does.
>
> Just to round off this discussion, after giving it some more thought I
> agree that the case where you would need callee-saved registers
> restored is probably rather pathological.  Any sane use of
> get/set/swapcontext is manageable without this.
>
> So, Vineet, I'm now convinced your approach is sound.  I will probably
> amend the OpenRISC arch to behave similarly.  Consider your entire
> patch Acked now.

I'll add your ack to the the signal handling patch as the contention was primarily
on sigcontext bits.

Thx,
-Vineet
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