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Date: Mon, 11 Feb 2013 10:28:06 +0000 From: James Hogan <james.hogan@...tec.com> To: Vineet Gupta <Vineet.Gupta1@...opsys.com> CC: Jonas Bonn <jonas.bonn@...il.com>, 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 11/02/13 10:13, Vineet Gupta wrote: > 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. I think Jonas' point was that signals are asynchronous, i.e. you could get interrupted by a signal at virtually any time during the program's execution. Cheers James -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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