From: Andrew Morton <akpm@linux-foundation.org>
To: Jakub Kicinski <kuba@kernel.org>
Cc: NeilBrown <neilb@suse.de>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Jonathan Corbet <corbet@lwn.net>, Xin Long <lucien.xin@gmail.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Vlad Yasevich <vyasevich@gmail.com>,
Neil Horman <nhorman@tuxdriver.com>,
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
linux-sctp@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH 0/3] Fix some seq_file users that were recently broken
Date: Sun, 7 Feb 2021 13:11:45 -0800 [thread overview]
Message-ID: <20210207131145.ea12b9944c54ad2f10932bc3@linux-foundation.org> (raw)
In-Reply-To: <20210206142924.2bfc3cf5@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
On Sat, 6 Feb 2021 14:29:24 -0800 Jakub Kicinski <kuba@kernel.org> wrote:
> On Fri, 5 Feb 2021 14:35:50 -0800 Andrew Morton wrote:
> > On Fri, 05 Feb 2021 11:36:30 +1100 NeilBrown <neilb@suse.de> wrote:
> >
> > > A recent change to seq_file broke some users which were using seq_file
> > > in a non-"standard" way ... though the "standard" isn't documented, so
> > > they can be excused. The result is a possible leak - of memory in one
> > > case, of references to a 'transport' in the other.
> > >
> > > These three patches:
> > > 1/ document and explain the problem
> > > 2/ fix the problem user in x86
> > > 3/ fix the problem user in net/sctp
> >
> > 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code and
> > interface") was August 2018, so I don't think "recent" applies here?
> >
> > I didn't look closely, but it appears that the sctp procfs file is
> > world-readable. So we gave unprivileged userspace the ability to leak
> > kernel memory?
> >
> > So I'm thinking that we aim for 5.12-rc1 on all three patches with a cc:stable?
>
> I'd rather take the sctp patch sooner, we'll send another batch
> of networking fixes for 5.11, anyway. Would that be okay with you?
Sure.
next prev parent reply other threads:[~2021-02-07 21:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-05 0:36 [PATCH 0/3] Fix some seq_file users that were recently broken NeilBrown
2021-02-05 0:36 ` [PATCH 3/3] net: fix iteration for sctp transport seq_files NeilBrown
2021-02-05 14:32 ` Marcelo Ricardo Leitner
2021-02-05 22:35 ` [PATCH 0/3] Fix some seq_file users that were recently broken Andrew Morton
2021-02-06 22:29 ` Jakub Kicinski
2021-02-07 21:11 ` Andrew Morton [this message]
2021-02-08 19:42 ` Jakub Kicinski
2021-02-07 22:45 ` NeilBrown
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