linux-kernel - Re: [PATCH 3/3] tracing/filters: disallow newline as delimeter

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Message-ID: <20090421100722.GA18486@elte.hu>
Date:	Tue, 21 Apr 2009 12:07:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Tom Zanussi <tzanussi@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] tracing/filters: disallow newline as delimeter


* Li Zefan <lizf@...fujitsu.com> wrote:

> Ingo Molnar wrote:
> > * Li Zefan <lizf@...fujitsu.com> wrote:
> > 
> >> I guess because user input is often ended with '\n' (like "echo 
> >> xxx"), thus '\n' is used as a delimeter besides ' ', but we can 
> >> just strip tailing spaces.
> > 
> > Hm, how about:
> > 
> > ( echo 'x'
> >   echo '|| y' ) > filter
> > 
> > type of scripts? Shouldnt the parser be permissive in general?
> > 
> 
> This patch doesn't forbid this usage: ;)
> 
> ( echo 'parent_comm == a'
>   echo '|| parent_comm == b' ) > filter
> 
> This patch does forbid this usage:
> 
> ( echo 'parent_comm'
>   echo '=='
>   echo 'a' ) > filter

Same argument though, no?

	Ingo
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