netdev - Re: use-after-free in sctp_do

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Date:	Thu, 03 Dec 2015 16:06:11 -0200
From:	Marcelo <marcelo.leitner@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Vlad Yasevich <vyasevich@...il.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Neil Horman <nhorman@...driver.com>,
	linux-sctp@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Maciej Żenczykowski <maze@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: use-after-free in sctp_do_sm



Em 3 de dezembro de 2015 15:59:10 BRST, Eric Dumazet <eric.dumazet@...il.com> escreveu:
>On Thu, 2015-12-03 at 15:43 -0200, Marcelo Ricardo Leitner wrote:
>
>> Vlad, others,
>> 
>> It's been a long time but this was introduced by commit 914e1c8b6980
>> ("sctp: Inherit all socket options from parent correctly."). This is
>not
>> very consistent with how other protocols work and it will be hard to
>> keep tracking a negative mask of flags that we can't copy.
>> 
>> I reviewed the list of options and I'm thinking that only
>> SO_BINDTODEVICE is worth copying, leaving the others for the
>application
>> to re-set, as it is for other protocols. So I'm thinking on simply:
>> 
>> -       newsk->sk_flags = sk->sk_flags;
>> +       newsk->sk_flags = sk->sk_flags & SO_BINDTODEVICE;
>> 
>> in the above.
>> 
>> What do you think?
>
>I think SO_BINDTODEVICE is not a flag ;)
>
>#define SO_BINDTODEVICE    25

Oops, indeed!
Idea persists.
Thx!
-- 
Sent from mobile. Please excuse my brevity.
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