linux-kernel - Re: [005/107] sparc: Allow handling signals when stack is corrupted.

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Message-ID: <1320381208.3079.61.camel@deadeye>
Date:	Fri, 04 Nov 2011 04:33:28 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, "David S. Miller" <davem@...emloft.net>
Subject: Re: [005/107] sparc: Allow handling signals when stack is corrupted.

On Wed, 2011-11-02 at 15:13 -0700, Greg KH wrote:
> 2.6.32-longterm review patch.  If anyone has any objections, please let us know.
> 
> ------------------
> 
> From: "David S. Miller" <davem@...emloft.net>
> 
> commit 5598473a5b40c47a8c5349dd2c2630797169cf1a upstream.
> 
> If we can't push the pending register windows onto the user's stack,
> we disallow signal delivery even if the signal would be delivered on a
> valid seperate signal stack.
> 
> Add a register window save area in the signal frame, and store any
> unsavable windows there.
> 
> On sigreturn, if any windows are still queued up in the signal frame,
> try to push them back onto the stack and if that fails we kill the
> process immediately.
> 
> This allows the debug/tst-longjmp_chk2 glibc test case to pass.
[...]

But is there a real application that needs this?

Ben.

-- 
Ben Hutchings
Sturgeon's Law: Ninety percent of everything is crap.

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