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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS 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 32C17C43381 for ; Tue, 19 Feb 2019 04:09:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 029D6217D9 for ; Tue, 19 Feb 2019 04:09:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726213AbfBSEJF (ORCPT ); Mon, 18 Feb 2019 23:09:05 -0500 Received: from mail-it1-f200.google.com ([209.85.166.200]:42737 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725764AbfBSEJF (ORCPT ); Mon, 18 Feb 2019 23:09:05 -0500 Received: by mail-it1-f200.google.com with SMTP id j127so88261itj.7 for ; Mon, 18 Feb 2019 20:09:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=YjnQ9Zus/FCA+7QdLz3Th3HUkorcnehB56B8l35aOdI=; b=ad053Z+PFgJKnycc5AdW7zGePOtBglaOmLmCYYEk/U754N41ProAYVRDsgah+f2g// I0u82FGhwNCJNZETg+7JNQnoFosB/CpoFlt58co8uHzY+85ARF+3qxwSpvg8RkalGO4/ WN/6EV9cwRvq/wDme6YF9Sf16VwpLLNUjFk6sy0UaU+VBlR2XuYkOQueEQA+m0aR5VMY tRYGxBH10wVF9j5S+mmoicUaodg/ShL8s9t/hROacQOW9alWibaAxt1icb+Sw81XYn94 U9ATDMAVR646FxRVXE9G1pFdKSqs4MGpGJGXnFgWjxUKfBRMUTYy68tX7SQkxQM8AEx6 WqTw== X-Gm-Message-State: AHQUAuYhS2emArx7Q3fwseDc2zkNZq4jPvmIGH/I7J0LfGPtRD0jAn6W 0hoRn+gsifbEgAkICA/fe0J9AcwTIp5408xhuPbcGxNtXJ8G X-Google-Smtp-Source: AHgI3IbLynI9H0sVKeEI4T4ibbrMWkkxPhkGH9S2YLjkL5l1hT55bdhlVuDff1yfCQgoGfSovu8VbNwVlYtoTEMhF16lCeA++LyC MIME-Version: 1.0 X-Received: by 2002:a05:660c:708:: with SMTP id l8mr1306300itk.14.1550549343847; Mon, 18 Feb 2019 20:09:03 -0800 (PST) Date: Mon, 18 Feb 2019 20:09:03 -0800 In-Reply-To: <00000000000055ee31057ce8f277@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d8cfe60582376608@google.com> Subject: Re: KASAN: use-after-free Read in addr_handler From: syzbot To: danielj@mellanox.com, dledford@redhat.com, jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, parav@mellanox.com, swise@opengridcomputing.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: a3b22b9f11d9 Linux 5.0-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14c5df58c00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f dashboard link: https://syzkaller.appspot.com/bug?extid=b358909d8d01556b790b compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1493d4d0c00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b358909d8d01556b790b@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x30e0/0x4700 kernel/locking/lockdep.c:3215 Read of size 8 at addr ffff88808bfc1150 by task kworker/u4:5/7685 CPU: 1 PID: 7685 Comm: kworker/u4:5 Not tainted 5.0.0-rc7 #77 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ib_addr process_one_req Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 __lock_acquire+0x30e0/0x4700 kernel/locking/lockdep.c:3215 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 addr_handler+0xa5/0x300 drivers/infiniband/core/cma.c:2970 process_one_req+0x109/0x680 drivers/infiniband/core/addr.c:643 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173 worker_thread+0x98/0xe40 kernel/workqueue.c:2319 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 27464: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] __rdma_create_id+0x5f/0x4e0 drivers/infiniband/core/cma.c:879 ucma_create_id+0x1de/0x640 drivers/infiniband/core/ucma.c:506 ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x116/0x8e0 fs/read_write.c:485 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 27463: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 rdma_destroy_id+0x723/0xab0 drivers/infiniband/core/cma.c:1849 ucma_close+0x115/0x320 drivers/infiniband/core/ucma.c:1770 __fput+0x2df/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808bfc0dc0 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 912 bytes inside of 2048-byte region [ffff88808bfc0dc0, ffff88808bfc15c0) The buggy address belongs to the page: page:ffffea00022ff000 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea000281a888 ffffea0002999e08 ffff88812c3f0c40 raw: 0000000000000000 ffff88808bfc0540 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808bfc1000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808bfc1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88808bfc1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808bfc1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808bfc1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================