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: <6e28cea9-d615-449d-9c68-aa155efc8444@lunn.ch>
Date: Fri, 2 Jun 2023 17:37:19 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Ding Hui <dinghui@...gfor.com.cn>
Cc: Alexander H Duyck <alexander.duyck@...il.com>, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	pengdonglin@...gfor.com.cn, huangcun@...gfor.com.cn
Subject: Re: [PATCH net-next] net: ethtool: Fix out-of-bounds copy to user

> > Also, RTNL should be held during the time both calls are made into the
> > driver. So nothing from userspace should be able to get in the middle
> > of these calls to change the number of queues.
> > 
> 
> The RTNL lock is already be held during every each ioctl in dev_ethtool().
> 
>     rtnl_lock();
>     rc = __dev_ethtool(net, ifr, useraddr, ethcmd, state);
>     rtnl_unlock();

Yes, exactly. So the kernel should be safe from buffer overruns.

Userspace will not get more than it asked for. It might get less, and
it could be different to the previous calls. But i'm not aware of
anything which says anything about the consistency between different
invocations of ethtool -S.

	Andrew

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ