linux-kernel - Re: [PATCH] printk: fix discarding message when recursion

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Message-ID: <20081219215347.GG2351@elte.hu>
Date:	Fri, 19 Dec 2008 22:53:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Cc:	Toshikazu Nakayama <nakayama.ts@...s.nec.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] printk: fix discarding message when recursion_bug


* Hiroshi Shimamoto <h-shimamoto@...jp.nec.com> wrote:

> From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
> 
> Impact: fix
> 
> When recursion_bug is true, kernel discards original message because printk_buf
> contains recursion_bug_msg with NULL terminator. The sizeof(recursion_bug_msg)
> makes this, use strlen() to get correct length without NULL terminator.
> 
> Reported-by: Toshikazu Nakayama <nakayama.ts@...s.nec.co.jp>
> Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
> ---
>  kernel/printk.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)

Good one - applied to tip/core/printk, thanks!

Btw., i'm curious: in what situation was such recursion observed, and how 
did the kernel behave? You saw a truncated recursion message in dmesg - or 
was it worse?

	Ingo
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