linux-kernel - Re: [PATCH net-next v4] net: Implement fault injection forcing skb reallocation

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Message-ID: <20241031170428.27c1f26a@kernel.org>
Date: Thu, 31 Oct 2024 17:04:28 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Jonathan Corbet <corbet@....net>, Akinobu Mita <akinobu.mita@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Andrew Morton
 <akpm@...ux-foundation.org>, kernel-team@...a.com, Thomas Huth
 <thuth@...hat.com>, "Paul E. McKenney" <paulmck@...nel.org>, "Borislav
 Petkov (AMD)" <bp@...en8.de>, Steven Rostedt <rostedt@...dmis.org>,
 Xiongwei Song <xiongwei.song@...driver.com>, Mina Almasry
 <almasrymina@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, Alexander
 Lobakin <aleksander.lobakin@...el.com>, Oleksij Rempel
 <o.rempel@...gutronix.de>, "open list:DOCUMENTATION"
 <linux-doc@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
 "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v4] net: Implement fault injection forcing skb
 reallocation

On Thu, 31 Oct 2024 02:41:18 -0700 Breno Leitao wrote:
> > Should we mention here that KASAN or some such is needed to catch 
> > the bugs? Chances are the resulting UAF will not crash and go unnoticed
> > without KASAN.  
> 
> What about adding something like this in the fail_skb_realloc section in
> the fault-injection.rst file:

SG

> > the buffer needs to be null terminated, like:
> > 
> > skb_realloc.devname[IFNAMSIZ - 1] = '\0';
> > 
> > no?  
> 
> Yes, but isn't it what the next line do, with strim()?

I could be wrong, but looks like first thing strim does is call strlen()