linux-kernel - Re: [PATCH] tracing/syscalls: ignore numbers outside NR

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Message-ID: <20141030082606.GA7945@infradead.org>
Date:	Thu, 30 Oct 2014 01:26:06 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Rabin Vincent <rabin@....in>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] tracing/syscalls: ignore numbers outside NR_syscalls'
 range

On Wed, Oct 29, 2014 at 11:06:58PM +0100, Rabin Vincent wrote:
> ARM has some private syscalls (for example, set_tls(2)) which lie
> outside the range of NR_syscalls.  If any of these are called while
> syscall tracing is being performed, out-of-bounds array access will
> occur in the ftrace and perf sys_{enter,exit} handlers.

While this patch looks like good caution, having syscalls outside of
NR_syscalls seems like a receipe for a disaster.  Can you try to fix
that issue as ell, please?
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