From: Jeff Dike <jdike@addtoit.com>
To: lepton <ytht.net@gmail.com>
Cc: lkm <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.6.22.6 user-mode linux: use address instead of value as argument in os_free_irq_by_cb
Date: Mon, 24 Sep 2007 13:02:20 -0400 [thread overview]
Message-ID: <20070924170220.GE23078@c2.user-mode-linux.org> (raw)
In-Reply-To: <20070922043955.GA4550@router.lepton.home>
On Sat, Sep 22, 2007 at 12:39:55PM +0800, lepton wrote:
> There is a bug in os_free_irq_by_cb, when the first element
> of active_fds list is free, the value of active_fds is not
> updated, just value in stack is updated.
Man, that sucks.
Nice spotting.
>
> The intresting thing is that without this patch, a poweroff
> in user mode linux guest will halt the host linux system.It
> seems that after the tracing thread is dead, the syscall to
> sys_reboot of the traced thread is executed by host. I don't
> know if it is another bug.
I would say that you shouldn't be running UMLs as root. However, a
sys_reboot shouldn't escape being ptraced either. This is a bug, but
I don't see any connection between it and ptrace missing a final
system call.
Jeff
--
Work email - jdike at linux dot intel dot com
next prev parent reply other threads:[~2007-09-24 17:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-22 4:39 [PATCH] 2.6.22.6 user-mode linux: use address instead of value as argument in os_free_irq_by_cb lepton
2007-09-24 17:02 ` Jeff Dike [this message]
2007-09-25 1:13 ` lepton
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