linux-kernel - Re: buffer overflows in the tty flip buffer in 2.6.17

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Message-Id: <45D724A3.000002.25611@mfront7.yandex.ru>
Date:	Sat, 17 Feb 2007 18:52:03 +0300 (MSK)
From:	"Mockern" <Mockern@...dex.ru>
To:	lsorense@...lub.uwaterloo.ca
Cc:	linux-kernel@...r.kernel.org
Subject: Re: buffer overflows in the tty flip buffer in 2.6.17

Thanx for your respond. 

Could you please inform me what patches exactly you have grabbed?

>On Sat, Feb 17, 2007 at 03:29:31PM +0300, Mockern wrote:
>> When data is received from the hardware, it needs to be placed into the tty device's flip buffer. This can be done with the following bit of code:
>> 
>> for (i = 0; i < data_size; ++i) {
>>         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
>>                 tty_flip_buffer_push(tty);
>>         tty_insert_flip_char(tty, data[i], 0);
>> }
>> tty_flip_buffer_push(tty);
>> 
>> This example makes sure there are no buffer overflows in the tty flip buffer as the data is being added. 
>> 
>> But how it is done in 2.6.17 linux kernel? I did check this "overflow code" in new tty driver's code. This code looks like just removed. But somehow overflow in the tty buffer must be kept.
>
>Well there was a problem in 2.6.16, which was fixed by 2.6.18, although
>I am not sure if it was done by 2.6.17.  It would loose characters due
>to buffer overflow and not properly checking under high load.  I grabbed
>a few patches from the git tree that were added after 2.6.16 to fix the
>tty problems I was having.
>
>--
>Len Sorensen
>-
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