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

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Date:	Tue, 21 Apr 2009 18:14:41 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
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

Ingo Molnar wrote:
> * 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?
> 

Then I have no strong opinion on this. I'm fine to drop this patch.


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