linux-kernel - Re: [PATCH] kernel: kallsyms: parameters checking, for EXPORT_SYMBOL

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Date:	Wed, 10 Apr 2013 18:56:23 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Stephen Boyd <sboyd@...eaurora.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel: kallsyms: parameters checking, for EXPORT_SYMBOL_GPL
 functions

On 2013年04月10日 14:57, Rusty Russell wrote:
> Chen Gang <gang.chen@...anux.com> writes:
>> >   for EXPORT_SYMBOL_GPL functions, necessary to check their parameters.
>> >
>> > Signed-off-by: Chen Gang <gang.chen@...anux.com>
> Why?
> 
> If someone misuses these functions, they crash and thus indicate that
> the caller shouldn't do that.
> 

  for me, I think:

    if it is used by self (such as static functions):
      I prefer to crash immediatly.
      it will help us to find issue, quickly.

    if it can be used by others (such as EXPORT_SYMBOL_GPL):
      I prefer to return fail and tell caller that parameter is invalid.
      it is more polite to callers, and still indicate it may be an issue.

  :-)


> Or is someone already doing this?
> 

  really has:

    kernel: __wake_up_sync_key in kernel/sched/core.c.
    lib: *printf.
    mm:  kfree.


> Confused,
> Rusty.
> 


-- 
Chen Gang

Asianux Corporation
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