Messages in this thread | | | Date | Mon, 11 Feb 2013 15:43:44 +0530 | From | Vineet Gupta <> | Subject | Re: pt_regs leak into userspace (was Re: [PATCH v3 20/71] ARC: Signal handling) |
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On Monday 11 February 2013 03:06 PM, Jonas Bonn wrote: > On 11 February 2013 08:26, Vineet Gupta <Vineet.Gupta1@synopsys.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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