linux-kernel - Re: [PATCH 1/2] ARM: entry-common: fix forgotten set of thread

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Date:	Fri, 16 Jan 2015 15:59:23 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Roman Peniaev <r.peniaev@...il.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Will Deacon <will.deacon@....com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Sekhar Nori <nsekhar@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] ARM: entry-common: fix forgotten set of
 thread_info->syscall

On Sat, Jan 17, 2015 at 12:57:02AM +0900, Roman Peniaev wrote:
> On Fri, Jan 16, 2015 at 7:54 AM, Kees Cook <keescook@...omium.org> wrote:
> > One interesting thing I noticed (which is unchanged by this series),
> > but pulling ARM_r7 during the seccomp ptrace event shows __NR_poll,
> > not __NR_restart_syscall, even though it was a __NR_restart_syscall
> > trap from seccomp. Is there a better place to see the actual syscall?
> 
> As I understand we do not push new r7 to the stack, and ptrace uses the
> old value.

And why should we push r7 to the stack?  ptrace should be using the
recorded system call number, rather than poking about on the stack
itself.

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