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

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Date:	Mon, 11 Feb 2013 15:43:44 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Jonas Bonn <jonas.bonn@...il.com>
CC:	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>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: pt_regs leak into userspace (was Re: [PATCH v3 20/71] ARC: Signal
 handling)

On Monday 11 February 2013 03:06 PM, Jonas Bonn wrote:
> On 11 February 2013 08:26, Vineet Gupta <Vineet.Gupta1@...opsys.com> wrote:
>
>> The only downside of this patch is that userspace signal stack grows in size,
>> since signal frame only cares about scratch regs (pt_regs), but has to accommodate
>> unused placeholder for callee regs too by virtue of using user_regs_struct.
> Is this really true?  Don't setcontext and friends require that _all_
> the registers be part of sigcontext?

But for an ABI - callee saved regs will anyhow be saved/restored even in
setcontext case ! So collecting it for that purpose seems useless, or am I missing
something here.

-Vineet

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