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[46.193.73.98]) by smtp.gmail.com with ESMTPSA id o20-20020a05600c379400b0039c18d3fe27sm1533956wmr.19.2022.05.31.02.01.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 31 May 2022 02:01:45 -0700 (PDT) Message-ID: Date: Tue, 31 May 2022 03:01:44 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes Content-Language: en-US To: Hao Xu , syzbot , asml.silence@gmail.com, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000f0b26205e04a183b@google.com> <3d3c6b5f-84cd-cb25-812e-dac77e02ddbf@kernel.dk> From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 5/31/22 3:00 AM, Hao Xu wrote: > On 5/31/22 16:45, Jens Axboe wrote: >> On 5/31/22 1:55 AM, syzbot wrote: >>> Hello, >>> >>> syzbot found the following issue on: >>> >>> HEAD commit: 3b46e4e44180 Add linux-next specific files for 20220531 >>> git tree: linux-next >>> console output: https://syzkaller.appspot.com/x/log.txt?x=16e151f5f00000 >>> kernel config: https://syzkaller.appspot.com/x/.config?x=ccb8d66fc9489ef >>> dashboard link: https://syzkaller.appspot.com/bug?extid=b6c9b65b6753d333d833 >>> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 >>> >>> Unfortunately, I don't have any reproducer for this issue yet. >>> >>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>> Reported-by: syzbot+b6c9b65b6753d333d833@syzkaller.appspotmail.com >>> >>> ================================================================================ >>> ================================================================================ >>> UBSAN: array-index-out-of-bounds in fs/io_uring.c:8860:19 >>> index 75 is out of range for type 'io_op_def [47]' >> >> 'def' is just set here, it's not actually used after 'opcode' has been >> verified. >> > > Maybe we can move it to be below the opcode check to comfort UBSAN. Yeah that's what I did, just rebased it to get rid of it: https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.19&id=fcde59feb1affb6d56aecadc3868df4631480da5 -- Jens Axboe