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[142.162.115.133]) by smtp.gmail.com with ESMTPSA id p186sm10304929qka.66.2021.04.19.10.50.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Apr 2021 10:50:56 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1lYY2x-008dEP-MI; Mon, 19 Apr 2021 14:50:55 -0300 Date: Mon, 19 Apr 2021 14:50:55 -0300 From: Jason Gunthorpe To: Hao Sun Cc: dledford@redhat.com, linux-rdma@vger.kernel.org, leon@kernel.org, linux-kernel@vger.kernel.org Subject: Re: KASAN: use-after-free Read in cma_cancel_operation, rdma_listen Message-ID: <20210419175055.GA2047089@ziepe.ca> References: <20210413133359.GG227011@ziepe.ca> <20210413134458.GI227011@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 13, 2021 at 10:19:25PM +0800, Hao Sun wrote: > Jason Gunthorpe 于2021年4月13日周二 下午9:45写道： > > > > On Tue, Apr 13, 2021 at 09:42:43PM +0800, Hao Sun wrote: > > > Jason Gunthorpe 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. > > > > Do you have this in the C format? > > > > Just tried to use syz-prog2c to convert the repro-prog to C format. > The repro program of rdma_listen was successfully reproduced > (uploaded in attachment), the other one failed. it looks like > syz-prog2c may not be able to do the equivalent conversion. > You can use syz-execprog to execute the reprogram directly, this > method can reproduce both crashes, I have tried it. I tried this program and it reliably deadlocks my kernel :| So there is certainly something here Jason