linux-kernel - Re: Fw: Buffer overflow in CIFS VFS.

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Message-ID: <4735AC13.9030206@czajsoft.pl>
Date:	Sat, 10 Nov 2007 14:03:15 +0100
From:	Przemyslaw Wegrzyn <czajnik@...jsoft.pl>
To:	Steve French <smfrench@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, joern@...fs.org,
	linux-cifs-client@...ts.samba.org
Subject: Re: Fw: Buffer overflow in CIFS VFS.

Steve French wrote:
> below.   The obvious need is to create an SendReceive-NoResponse (or
> equivalent) which
> frees the SMB request buffer after send, and does not copy into an smb
> response buffer.  The following functions need to be changed to use
>   
How about modifying SendReceive to behave like that if NULL is passed as
output buffer ?

>> Obviously it is up to you, as a maintainer. I'd prefer adding a small
>> header to each buffer with the buffer size and perhaps a type, or even a
>> destructor function pointer. Simple macros could be used to obtain
>> buffer size, given the buffer body pointer, or to dispose the buffer.
>> That would save from checking the buffer type all over the code
>> explicitly, or even worse, make strange assumptions about the type of
>> buffer being passed - as we can see this is error-prone. That for a
>> little cost of a few additional bytes per buffer.
>>     
> That might be better, although without memory pools, this would perform
> much worse
>   
Why ? I don't get your point here.

Przemyslaw

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