linux-kernel - Re: [revert request for commit 9fff2fa] Re: [git pull] signals pile 3

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Message-ID: <20121014195611.GA2616@ZenIV.linux.org.uk>
Date:	Sun, 14 Oct 2012 20:56:11 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Daniel Mack <zonque@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [revert request for commit 9fff2fa] Re: [git pull] signals pile 3

On Sun, Oct 14, 2012 at 08:24:03PM +0100, Al Viro wrote:

> Russell, could you recall what those had been about?  I'm not sure if that
> had been oopsable that far back (again, oops scenario is userland stack
> page getting swapped out before we get to start_thread(), leading to
> direct read from an absent page in start_thread() by plain ldr, without
> anything in exception table about that insn), but it looks very odd
> regardless of that problem.

BTW, arm64 has copied that logics, so it also seems to be unsafe and very
odd - there we definitely have only ELF to cope with.  arm64 folks Cc'd...
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