linux-kernel - Re: [PATCH v3] kernel: kallsyms: memory override issue, need check destination buffer length

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Date:	Tue, 16 Apr 2013 09:19:07 +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 v3]  kernel: kallsyms: memory override issue, need check
 destination buffer length

On 2013年04月15日 13:48, Rusty Russell wrote:
> Chen Gang <gang.chen@...anux.com> writes:
> 
>> >   We don't export any symbols > 128 characters, but if we did then
>> >   kallsyms_expand_symbol() would overflow the buffer handed to it.
>> >   So we need check destination buffer length when copying.
>> >
>> >   the related test:
>> >     if we define an EXPORT function which name more than 128.
>> >     will panic when call kallsyms_lookup_name by init_kprobes on booting.
>> >     after check the length (provide this patch), it is ok.
>> >
>> >   Implementaion:
>> >     add additional destination buffer length parameter (maxlen)
>> >     if uncompressed string is too long (>= maxlen), it will be truncated.
>> >     not check the parameters whether valid, since it is a static function.
> Thanks, applied.
> 
> I've put this in my modules-next branch.
> 

  thank you very much to spend time resources for it.

  and next, I should be careful to send patch. so do not wast other
members' time resources for my careless mistakes.

  the details are:
    a. if modify code, need always compile again, at least.
    b. reduce reply times, so can reduce some of my waste information.

  I will let additional machine (a PC) for test and compile instead of
my current work machine, so when I have to do another things (normally,
it is), the individual machine can continue compiling or testing.

  thanks again.

  :-)

> Cheers,
> Rusty.
> 
> 

-- 
Chen Gang

Asianux Corporation
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