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=-7.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 27980C3F2CD for ; Fri, 28 Feb 2020 16:21:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB41A2467B for ; Fri, 28 Feb 2020 16:21:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="Cov8OYp6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726720AbgB1QVL (ORCPT ); Fri, 28 Feb 2020 11:21:11 -0500 Received: from mail-qk1-f195.google.com ([209.85.222.195]:38556 "EHLO mail-qk1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725730AbgB1QVL (ORCPT ); Fri, 28 Feb 2020 11:21:11 -0500 Received: by mail-qk1-f195.google.com with SMTP id z19so3477207qkj.5 for ; Fri, 28 Feb 2020 08:21:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=UkznnMO75zRejh3lSQN1L+vy300yacIDnI3WrUK/1uw=; b=Cov8OYp65FX2yNvATDaf7m7e20ZmwQIqDLeVgweQDlUeJYiCfpicCDYbwQhWxfGLb+ T832RAZi9HQPOP+NwEslplxMgRpnI+F55eKJJkR5dpQBAFYJSaTYKN9qz8V5pT8Hf/1L jY9ftioSmMYIE8FRQJ2RHVk5cEFRpZugmy15dnrMZhHbbqGbr2jP5nYlZrZpYpugXitI NeUHI/kdyWYUAH16bp6jU2nnRh5/aGnNW1qHhQKYzKyFcjJ7AsMWwXSN5ZoTe9rzbNoS dOvJBi8TAUuCTjSfWzA/z77By++YKHUBNsl5UPSDKnHpRKK/GpQePF3cU3SIRvibNbtn zU3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=UkznnMO75zRejh3lSQN1L+vy300yacIDnI3WrUK/1uw=; b=tTRI4MIzEJWjYSNU/i2fue8mvPYLqDbsCCKIzjqUg8UI0zKS3jigUFI56fkDGCQLIQ sFlzPLlS6wm2ISQyVbGoJ+QIrv5WeQyZiyHAFUBiE0xthY3RT3TlToeyce7PuyyYh+JU ilYnZqee40I55XShNn/si1xewhwlSH9waRN3iGyrAnb3Q6AqmFyAvFNzkrEpzIciRby5 hOCICqDknYIWgoGqSFNXTHEVDq4Nq8SMzxoFCTZzM2ZMMhmoiG8VyZArm48Q8WUwFgDk MZACR/Heu9S6fusUBISIe+JWyqekzRE76yswMEGB0SRKIiut1pqp0IcUK7rkK4ZItBzI ao0Q== X-Gm-Message-State: APjAAAUCv26kLjC8NS4GmSu7mX1B9a+qRsRh85jymEqziMf7LCGCiVzb v2VIY1nRT8dHCmCp3wnPDn3Wow== X-Google-Smtp-Source: APXvYqyu+eeF5tKNLM5HFfjayODDprsV20lOU9GMxMMNQJWu4HN0fRAhIoLfmUnTHpzZq9G2trxNGQ== X-Received: by 2002:a05:620a:698:: with SMTP id f24mr5182493qkh.476.1582906869713; Fri, 28 Feb 2020 08:21:09 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-68-57-212.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.68.57.212]) by smtp.gmail.com with ESMTPSA id l25sm5157259qkk.115.2020.02.28.08.21.08 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 28 Feb 2020 08:21:08 -0800 (PST) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1j7iNw-000737-5C; Fri, 28 Feb 2020 12:21:08 -0400 Date: Fri, 28 Feb 2020 12:21:08 -0400 From: Jason Gunthorpe To: syzbot Cc: bmt@zurich.ibm.com, dledford@redhat.com, kamalheib1@gmail.com, krishna2@chelsio.com, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: KASAN: use-after-free Read in iwcm_deref_id Message-ID: <20200228162108.GU31668@ziepe.ca> References: <000000000000e908c5059f752767@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000e908c5059f752767@google.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 25, 2020 at 11:00:13PM -0800, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: f8788d86 Linux 5.6-rc3 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=164503d9e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f > dashboard link: https://syzkaller.appspot.com/bug?extid=cb0c054eabfba4342146 > compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+cb0c054eabfba4342146@syzkaller.appspotmail.com #syz dup KASAN: use-after-free Read in rdma_listen (2) > ================================================================== > BUG: KASAN: use-after-free in dealloc_work_entries drivers/infiniband/core/iwcm.c:162 [inline] > BUG: KASAN: use-after-free in free_cm_id drivers/infiniband/core/iwcm.c:202 [inline] > BUG: KASAN: use-after-free in iwcm_deref_id+0xf6/0x170 drivers/infiniband/core/iwcm.c:215 > Read of size 8 at addr ffff8880a0d05978 by task syz-executor.2/15428 > > CPU: 1 PID: 15428 Comm: syz-executor.2 Not tainted 5.6.0-rc3-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1fb/0x318 lib/dump_stack.c:118 > print_address_description+0x74/0x5c0 mm/kasan/report.c:374 > __kasan_report+0x149/0x1c0 mm/kasan/report.c:506 > kasan_report+0x26/0x50 mm/kasan/common.c:641 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 > dealloc_work_entries drivers/infiniband/core/iwcm.c:162 [inline] > free_cm_id drivers/infiniband/core/iwcm.c:202 [inline] > iwcm_deref_id+0xf6/0x170 drivers/infiniband/core/iwcm.c:215 > destroy_cm_id+0x4b2/0x5b0 drivers/infiniband/core/iwcm.c:442 > iw_destroy_cm_id+0x15/0x20 drivers/infiniband/core/iwcm.c:453 > cma_iw_listen drivers/infiniband/core/cma.c:2453 [inline] > rdma_listen+0x6dc/0x9a0 drivers/infiniband/core/cma.c:3614 > cma_listen_on_dev+0x678/0x8e0 drivers/infiniband/core/cma.c:2501 > cma_listen_on_all drivers/infiniband/core/cma.c:2514 [inline] > rdma_listen+0x43b/0x9a0 drivers/infiniband/core/cma.c:3622 > ucma_listen+0x245/0x300 drivers/infiniband/core/ucma.c:1092 > ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684 > __vfs_write+0xb8/0x740 fs/read_write.c:494 > vfs_write+0x270/0x580 fs/read_write.c:558 > ksys_write+0x117/0x220 fs/read_write.c:611 > __do_sys_write fs/read_write.c:623 [inline] > __se_sys_write fs/read_write.c:620 [inline] > __x64_sys_write+0x7b/0x90 fs/read_write.c:620 > do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x45c449 > Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fe499194c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00007fe4991956d4 RCX: 000000000045c449 > RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 > RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 > R13: 0000000000000cbe R14: 00000000004cea14 R15: 0000000000000007 > > Allocated by task 15428: > save_stack mm/kasan/common.c:72 [inline] > set_track mm/kasan/common.c:80 [inline] > __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:515 > kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529 > kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3551 > kmalloc include/linux/slab.h:555 [inline] > alloc_work_entries drivers/infiniband/core/iwcm.c:172 [inline] > iw_cm_listen+0xdd/0x4a0 drivers/infiniband/core/iwcm.c:571 > cma_iw_listen drivers/infiniband/core/cma.c:2450 [inline] > rdma_listen+0x698/0x9a0 drivers/infiniband/core/cma.c:3614 > cma_listen_on_dev+0x678/0x8e0 drivers/infiniband/core/cma.c:2501 > cma_listen_on_all drivers/infiniband/core/cma.c:2514 [inline] > rdma_listen+0x43b/0x9a0 drivers/infiniband/core/cma.c:3622 > ucma_listen+0x245/0x300 drivers/infiniband/core/ucma.c:1092 > ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684 > __vfs_write+0xb8/0x740 fs/read_write.c:494 > vfs_write+0x270/0x580 fs/read_write.c:558 > ksys_write+0x117/0x220 fs/read_write.c:611 > __do_sys_write fs/read_write.c:623 [inline] > __se_sys_write fs/read_write.c:620 [inline] > __x64_sys_write+0x7b/0x90 fs/read_write.c:620 > do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > Freed by task 15428: > save_stack mm/kasan/common.c:72 [inline] > set_track mm/kasan/common.c:80 [inline] > kasan_set_free_info mm/kasan/common.c:337 [inline] > __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:476 > kasan_slab_free+0xe/0x10 mm/kasan/common.c:485 > __cache_free mm/slab.c:3426 [inline] > kfree+0x10d/0x220 mm/slab.c:3757 > dealloc_work_entries drivers/infiniband/core/iwcm.c:163 [inline] > alloc_work_entries drivers/infiniband/core/iwcm.c:174 [inline] > iw_cm_listen+0x288/0x4a0 drivers/infiniband/core/iwcm.c:571 > cma_iw_listen drivers/infiniband/core/cma.c:2450 [inline] > rdma_listen+0x698/0x9a0 drivers/infiniband/core/cma.c:3614 > cma_listen_on_dev+0x678/0x8e0 drivers/infiniband/core/cma.c:2501 > cma_listen_on_all drivers/infiniband/core/cma.c:2514 [inline] > rdma_listen+0x43b/0x9a0 drivers/infiniband/core/cma.c:3622 > ucma_listen+0x245/0x300 drivers/infiniband/core/ucma.c:1092 > ucma_write+0x2da/0x360 drivers/infiniband/core/ucma.c:1684 > __vfs_write+0xb8/0x740 fs/read_write.c:494 > vfs_write+0x270/0x580 fs/read_write.c:558 > ksys_write+0x117/0x220 fs/read_write.c:611 > __do_sys_write fs/read_write.c:623 [inline] > __se_sys_write fs/read_write.c:620 [inline] > __x64_sys_write+0x7b/0x90 fs/read_write.c:620 > do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > The buggy address belongs to the object at ffff8880a0d05800 > which belongs to the cache kmalloc-512 of size 512 > The buggy address is located 376 bytes inside of > 512-byte region [ffff8880a0d05800, ffff8880a0d05a00) > The buggy address belongs to the page: > page:ffffea0002834140 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 > flags: 0xfffe0000000200(slab) > raw: 00fffe0000000200 ffffea0001019988 ffffea000280e088 ffff8880aa400a80 > raw: 0000000000000000 ffff8880a0d05000 0000000100000004 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8880a0d05800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880a0d05880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > >ffff8880a0d05900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8880a0d05980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880a0d05a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > > This bug 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 bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.