linux-kernel - Re: [PATCH 3/3] checkpatch.pl: Add check for current->comm references

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Message-ID: <4DCCD0C3.9090908@gmail.com>
Date:	Fri, 13 May 2011 08:33:39 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	John Stultz <john.stultz@...aro.org>
CC:	LKML <linux-kernel@...r.kernel.org>, Ted Ts'o <tytso@....edu>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: Re: [PATCH 3/3] checkpatch.pl: Add check for current->comm references

On 05/13/2011 01:02 AM, John Stultz wrote:
> Now that accessing current->comm needs to be protected,
> avoid new current->comm usage by adding a warning to
> checkpatch.pl.
> 
> Fair warning: I know zero perl, so this was written in the
> style of "monkey see, monkey do". It does appear to work
> in my testing though.
> 
> Close review and feedback would be appreciated.
> 
> CC: Ted Ts'o <tytso@....edu>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> CC: David Rientjes <rientjes@...gle.com>
> CC: Dave Hansen <dave@...ux.vnet.ibm.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: linux-mm@...ck.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  scripts/checkpatch.pl |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index d867081..9d2eab5 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2868,6 +2868,10 @@ sub process {
>  			WARN("usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
>  		}
>  
> +# check for current->comm usage
> +		if ($line =~ /current->comm/) {

This should be something like \b(current|task|tsk|t)->comm\b to catch
also non-current comm accesses...

> +			WARN("comm access needs to be protected. Use get_task_comm, or printk's \%ptc formatting.\n" . $herecurr);
> +		}
>  # check for %L{u,d,i} in strings
>  		my $string;
>  		while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {


-- 
js
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