linux-kernel - Re: [BUG] skge: a possible sleep-in-atomic bug in skge

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20171212.083445.2256119006373036925.davem@davemloft.net>
Date:   Tue, 12 Dec 2017 08:34:45 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     baijiaju1990@...il.com
Cc:     mlindner@...vell.com, stephen@...workplumber.org,
        shemminger@...l.org, shemminger@...ux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] skge: a possible sleep-in-atomic bug in skge_remove

From: Jia-Ju Bai <baijiaju1990@...il.com>
Date: Tue, 12 Dec 2017 16:38:12 +0800

> According to drivers/net/ethernet/marvell/skge.c, the driver may sleep
> under a spinlock.
> The function call path is:
> skge_remove (acquire the spinlock)
>   free_irq --> may sleep
> 
> I do not find a good way to fix it, so I only report.
> This possible bug is found by my static analysis tool (DSAC) and
> checked by my code review.

This was added by:

commit a9e9fd7182332d0cf5f3e601df3e71dd431b70d7
Author: Stephen Hemminger <shemminger@...tta.com>
Date:   Tue Sep 27 13:41:37 2011 -0400

    skge: handle irq better on single port card

I think the free_irq() can be moved below the unlock.

Stephen, please take a look.

Thanks!