linux-kernel - Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs

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Date:	Fri, 4 Dec 2015 08:24:27 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Ohad Ben-Cohen <ohad@...ery.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>, kernel@...inux.com,
	Nathan_Lynch@...tor.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Andersson <bjorn@...o.se>, ludovic.barre@...com,
	Maxime Coquelin <maxime.coquelin@...com>
Subject: Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote
 processor using debugfs

On Thu, 03 Dec 2015, Arnd Bergmann wrote:

> On Thursday 03 December 2015 17:28:30 Lee Jones wrote:
> > > 
> > > Ah, interesting. I haven't tried myself, and just tried to read the
> > > code. Maybe glibc already catches zero-length writes before it gets
> > > into the kernel, or I just missed the part of the syscall that checks
> > > for this.
> > 
> > Glibc is responsible indeed:
> >   
> >   http://osxr.org/glibc/source/io/write.c
> 
> Ok, so an attacker can force the stack overflow by calling
> syscall(__NR_write, fd, p, 0) if that has any potential value,
> but normal users won't hit this case.

Right.  I have fixed the issue (and another one I found) anyway, if
only to rid the GCC warning.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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