linux-kernel - Re: [RFC] convert ftrace syscall tracer to TRACE

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Message-ID: <gu4fe0$ji7$1@taverner.cs.berkeley.edu>
Date:	Sat, 9 May 2009 17:44:32 +0000 (UTC)
From:	daw@...berkeley.edu (David Wagner)
To:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] convert ftrace syscall tracer to TRACE_EVENT()

Mathieu Desnoyers  wrote:
> I would expect to use copy_string_from_user (for strings)
> and copy_from_user for structures, because without any strings
> (especially), the trace information become much less useful.

Why isn't this racey?

(Copying from user space twice can give you two different results.)
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