Re: pt_regs leak into userspace (was Re: [PATCH v3 20/71] ARC: Signalhandling)

From: Vineet Gupta
Date: Fri Feb 15 2013 - 02:36:20 EST

On Friday 15 February 2013 12:53 PM, Jonas Bonn wrote:
> On 11 February 2013 15:07, Al Viro <viro@xxxxxxxxxxxxxxxxxx> 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.

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