linux-kernel - Re: KASAN: use-after-free Read in cma_cancel_operation, rdma

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Message-ID: <CACkBjsb2QU3+J3mhOT2nb0YRB0XodzKoNTwF3RCufFbSoXNm6A@mail.gmail.com>
Date:   Tue, 13 Apr 2021 21:42:43 +0800
From:   Hao Sun <sunhao.th@...il.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     dledford@...hat.com, linux-rdma@...r.kernel.org, leon@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: KASAN: use-after-free Read in cma_cancel_operation, rdma_listen

Jason Gunthorpe <jgg@...pe.ca> 于2021年4月13日周二 下午9:34写道：
>
> On Tue, Apr 13, 2021 at 11:36:41AM +0800, Hao Sun wrote:
> > Hi
> >
> > When using Healer(https://github.com/SunHao-0/healer/tree/dev) to fuzz
> > the Linux kernel, I found two use-after-free bugs which have been
> > reported a long time ago by Syzbot.
> > Although the corresponding patches have been merged into upstream,
> > these two bugs can still be triggered easily.
> > The original information about Syzbot report can be found here:
> > https://syzkaller.appspot.com/bug?id=8dc0bcd9dd6ec915ba10b3354740eb420884acaa
> > https://syzkaller.appspot.com/bug?id=95f89b8fb9fdc42e28ad586e657fea074e4e719b
>
> Then why hasn't syzbot seen this in a year's time? Seems strange
>

Seems strange to me too, but the fact is that the reproduction program
in attachment can trigger these two bugs quickly.

> > Current report Information:
> > commit:   89698becf06d341a700913c3d89ce2a914af69a2
>
> What commit is this?

The latest commit in the master branch,
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/