linux-kernel - Re: [PATCH] net: Fix potential NULL pointer dereference in __skb_try_recv

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Message-ID: <1452004797.8255.90.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 05 Jan 2016 06:39:57 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jacob Siverskog <jacob@...nage.engineering>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	David Miller <davem@...emloft.net>,
	Rainer Weikusat <rweikusat@...ileactivedefense.com>,
	netdev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: Fix potential NULL pointer dereference in
 __skb_try_recv_datagram

On Tue, 2016-01-05 at 15:34 +0100, Jacob Siverskog wrote:
> On Tue, Jan 5, 2016 at 3:14 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:

> >
> > You might build a kernel with KASAN support to get maybe more chances to
> > trigger the bug.
> >
> > ( https://www.kernel.org/doc/Documentation/kasan.txt )
> >
> 
> Ah. Doesn't seem to be supported on arm(32) unfortunately.

Then you could at least use standard debugging features :

CONFIG_SLAB=y
CONFIG_SLABINFO=y
CONFIG_DEBUG_SLAB=y
CONFIG_DEBUG_SLAB_LEAK=y

(Or equivalent SLUB options)

and

CONFIG_DEBUG_PAGEALLOC=y

(If arm(32) has CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y)



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