From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 441A8C433E0 for ; Thu, 18 Mar 2021 12:22:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F86364F4D for ; Thu, 18 Mar 2021 12:22:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229854AbhCRMVv (ORCPT ); Thu, 18 Mar 2021 08:21:51 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:14397 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229703AbhCRMVY (ORCPT ); Thu, 18 Mar 2021 08:21:24 -0400 Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4F1R0z5n77zkYmq; Thu, 18 Mar 2021 20:19:47 +0800 (CST) Received: from [10.174.177.244] (10.174.177.244) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Thu, 18 Mar 2021 20:21:15 +0800 Subject: Re: [syzbot] KASAN: slab-out-of-bounds Read in riscv_intc_irq To: Dmitry Vyukov , syzbot CC: Albert Ou , LKML , linux-riscv , Marc Zyngier , Palmer Dabbelt , Paul Walmsley , syzkaller-bugs , Thomas Gleixner References: <00000000000056b18b05bd7c6511@google.com> From: Kefeng Wang Message-ID: Date: Thu, 18 Mar 2021 20:21:15 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [10.174.177.244] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/3/14 18:47, Dmitry Vyukov wrote: > On Sun, Mar 14, 2021 at 11:14 AM syzbot > wrote: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: 0d7588ab riscv: process: Fix no prototype for arch_dup_tas.. >> git tree: git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes >> console output: https://syzkaller.appspot.com/x/log.txt?x=15a35756d00000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=81c0b708b31626cc >> dashboard link: https://syzkaller.appspot.com/bug?extid=005654dd9b8f26bd4c07 >> userspace arch: riscv64 >> >> 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+005654dd9b8f26bd4c07@syzkaller.appspotmail.com >> >> ================================================================== >> BUG: KASAN: slab-out-of-bounds in riscv_intc_irq+0x24/0xcc drivers/irqchip/irq-riscv-intc.c:24 >> Read of size 8 at addr ffffffe00c963bd0 by task kworker/1:1/4388 >> >> CPU: 1 PID: 4388 Comm: kworker/1:1 Not tainted 5.12.0-rc2-syzkaller-00467-g0d7588ab9ef9 #0 >> Hardware name: riscv-virtio,qemu (DT) >> Workqueue: events nsim_dev_trap_report_work >> Call Trace: >> [] walk_stackframe+0x0/0x23c arch/riscv/kernel/traps.c:201 >> >> Allocated by task 76347056: >> (stack is not available) >> >> Last potentially related work creation: > There seems to be some issue with riscv stack unwinder. > This does not have stacks. Hi, could you test with the following  patch about the no stack issue(from v5.11-rc4), I made a mistake when do some cleanup... https://lore.kernel.org/linux-riscv/ce5b3533-b75d-c31c-4319-9d29769bbbd5@huawei.com/T/#t > "BUG: unable to handle kernel access to user memory in schedule_tail" > does not have proper stacks: > https://syzkaller.appspot.com/bug?id=9de8c24d24004fd5e482555f5ad8314da2fb1cee > > I also found 2 riscv reports in "KASAN: use-after-free Read in > idr_for_each (2)": > https://syzkaller.appspot.com/bug?id=7f84dfc3902878befc22e52eb5c7298d0ad70cf3 > > both don't have any stacks: > > ================================================================== > BUG: KASAN: use-after-free in radix_tree_next_slot > include/linux/radix-tree.h:422 [inline] > BUG: KASAN: use-after-free in idr_for_each+0xf4/0x160 lib/idr.c:202 > Read of size 8 at addr ffffffe010c00878 by task syz-executor.1/4828 > > CPU: 0 PID: 4828 Comm: syz-executor.1 Not tainted > 5.12.0-rc2-syzkaller-00467-g0d7588ab9ef9 #0 > Hardware name: riscv-virtio,qemu (DT) > Call Trace: > [] walk_stackframe+0x0/0x23c arch/riscv/kernel/traps.c:201 > > Allocated by task 4828: > (stack is not available) > > Freed by task 4473: > (stack is not available) > > >> --- >> This report is generated by a bot. It may contain errors. >> See https://goo.gl/tpsmEJ for more information about syzbot. >> syzbot engineers can be reached at syzkaller@googlegroups.com. >> >> syzbot will keep track of this issue. See: >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv > . >