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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 5A251C3A5A2 for ; Fri, 20 Sep 2019 15:41:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 274BE208C0 for ; Fri, 20 Sep 2019 15:41:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393234AbfITPld (ORCPT ); Fri, 20 Sep 2019 11:41:33 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:48176 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393069AbfITPlc (ORCPT ); Fri, 20 Sep 2019 11:41:32 -0400 Received: by mail-io1-f71.google.com with SMTP id w16so11155985ioc.15 for ; Fri, 20 Sep 2019 08:41:31 -0700 (PDT) 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:cc; bh=eQctSkHe+j1MPGH3L/46q4Fwfa7SyPui4T2DB+cOb+0=; b=fw8yMoOX2uumYbVl3ghkhkqHIvQG/vuN/hEMotJk95wASLB4pVCoNIh/3a8UIs8ZCD BcVSuqUkl/jvyjPTw0p96VXIPoB/myfynS1sVDl2Ovh6dQyohwXlpIs13P0NqDuo9c69 /tLdf5Ej2nKeiOp9SLxyhUN1cQKEEoPl+b3S4VUphxgBw/TeIyLp78DhabZMb6SR5orW yVhD+Q4Pw+s+BnRnnQBBDxWBHAEoyG9AGnmuOScD0V+DL7xOVegjmktfy8cKhaucl39x C5PCh+tTpkvWx+ehJO4eLhr3nlL05YWKIJKou+QMLw73y9HCmHuWIpm2cwwOXWWvcfT/ C5Bg== X-Gm-Message-State: APjAAAVmjmnBzGXIicumG3rFD01NU+2dDagv8l7j50Yn/HPxGFBI0JTE jqdyDC1bG1YWVnywc79EtQc6v3m6uMaqACAXKzswvkwECilV X-Google-Smtp-Source: APXvYqwzZmO0rtiCceVWXdCc/eZvTbzGsKHvtULi0RKCvlLXxKkvo3aLqgMJGkqhoYeQVJ6qAzirco0yKwlrubDbMXqy4JUpuOHl MIME-Version: 1.0 X-Received: by 2002:a5e:9319:: with SMTP id k25mr20492666iom.290.1568994091374; Fri, 20 Sep 2019 08:41:31 -0700 (PDT) Date: Fri, 20 Sep 2019 08:41:31 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000078a22f0592fde7cd@google.com> Subject: Re: Re: KASAN: use-after-free Read in wdm_out_callback From: syzbot To: Andrey Konovalov Cc: andreyknvl@google.com, baijiaju1990@gmail.com, bigeasy@linutronix.de, colin.king@canonical.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, yuehaibing@huawei.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org > On Mon, Aug 19, 2019 at 4:48 PM syzbot > wrote: >> Hello, >> syzbot found the following crash on: >> HEAD commit: d0847550 usb-fuzzer: main usb gadget fuzzer driver >> git tree: https://github.com/google/kasan.git usb-fuzzer >> console output: https://syzkaller.appspot.com/x/log.txt?x=136553ba600000 >> kernel config: >> https://syzkaller.appspot.com/x/.config?x=dbc9c80cc095da19 >> dashboard link: >> https://syzkaller.appspot.com/bug?extid=9a22af9cbb07280ce9cf >> compiler: gcc (GCC) 9.0.0 20181231 (experimental) >> 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+9a22af9cbb07280ce9cf@syzkaller.appspotmail.com >> cdc_wdm 1-1:118.0: nonzero urb status received: -71 >> cdc_wdm 1-1:118.0: wdm_int_callback - 0 bytes >> ================================================================== >> BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50 >> kernel/locking/lockdep.c:3753 >> Read of size 8 at addr ffff8881cbdca8e8 by task swapper/0/0 >> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc4+ #26 >> 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+0xca/0x13e lib/dump_stack.c:113 >> print_address_description+0x6a/0x32c mm/kasan/report.c:351 >> __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 >> kasan_report+0xe/0x12 mm/kasan/common.c:612 >> __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753 >> lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412 >> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] >> _raw_spin_lock_irqsave+0x32/0x50 kernel/locking/spinlock.c:159 >> wdm_out_callback+0x45/0x170 drivers/usb/class/cdc-wdm.c:148 >> __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1657 >> usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1722 >> dummy_timer+0x120f/0x2fa2 drivers/usb/gadget/udc/dummy_hcd.c:1965 >> call_timer_fn+0x179/0x650 kernel/time/timer.c:1322 >> expire_timers kernel/time/timer.c:1366 [inline] >> __run_timers kernel/time/timer.c:1685 [inline] >> __run_timers kernel/time/timer.c:1653 [inline] >> run_timer_softirq+0x5cc/0x14b0 kernel/time/timer.c:1698 >> __do_softirq+0x221/0x912 kernel/softirq.c:292 >> invoke_softirq kernel/softirq.c:373 [inline] >> irq_exit+0x178/0x1a0 kernel/softirq.c:413 >> exiting_irq arch/x86/include/asm/apic.h:537 [inline] >> smp_apic_timer_interrupt+0x12f/0x500 arch/x86/kernel/apic/apic.c:1095 >> apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 >> >> RIP: 0010:default_idle+0x28/0x2e0 arch/x86/kernel/process.c:581 >> Code: 90 90 41 56 41 55 65 44 8b 2d 64 ea 93 7a 41 54 55 53 0f 1f 44 00 >> 00 >> e8 96 5b d5 fb e9 07 00 00 00 0f 00 2d 7a 8f 54 00 fb f4 <65> 44 8b 2d 40 >> ea 93 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3 >> RSP: 0018:ffffffff86c07da8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 >> RAX: 0000000000000007 RBX: ffffffff86c2b200 RCX: 0000000000000000 >> RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff86c2ba44 >> RBP: fffffbfff0d85640 R08: ffffffff86c2b200 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 >> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 >> cpuidle_idle_call kernel/sched/idle.c:154 [inline] >> do_idle+0x3c2/0x4f0 kernel/sched/idle.c:263 >> cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:354 >> start_kernel+0x838/0x872 init/main.c:785 >> secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 >> Allocated by task 83: >> save_stack+0x1b/0x80 mm/kasan/common.c:69 >> set_track mm/kasan/common.c:77 [inline] >> __kasan_kmalloc mm/kasan/common.c:487 [inline] >> __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460 >> kmalloc include/linux/slab.h:552 [inline] >> kzalloc include/linux/slab.h:748 [inline] >> wdm_create+0x56/0x1720 drivers/usb/class/cdc-wdm.c:786 >> wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922 >> usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 >> really_probe+0x281/0x6d0 drivers/base/dd.c:548 >> driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 >> __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 >> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 >> __device_attach+0x217/0x360 drivers/base/dd.c:894 >> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 >> device_add+0xae6/0x16f0 drivers/base/core.c:2165 >> usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 >> generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 >> usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 >> really_probe+0x281/0x6d0 drivers/base/dd.c:548 >> driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 >> __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 >> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 >> __device_attach+0x217/0x360 drivers/base/dd.c:894 >> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 >> device_add+0xae6/0x16f0 drivers/base/core.c:2165 >> usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 >> hub_port_connect drivers/usb/core/hub.c:5098 [inline] >> hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] >> port_event drivers/usb/core/hub.c:5359 [inline] >> hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 >> process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 >> worker_thread+0x96/0xe20 kernel/workqueue.c:2415 >> kthread+0x318/0x420 kernel/kthread.c:255 >> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 >> Freed by task 83: >> save_stack+0x1b/0x80 mm/kasan/common.c:69 >> set_track mm/kasan/common.c:77 [inline] >> __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449 >> slab_free_hook mm/slub.c:1423 [inline] >> slab_free_freelist_hook mm/slub.c:1474 [inline] >> slab_free mm/slub.c:3016 [inline] >> kfree+0xe4/0x2f0 mm/slub.c:3957 >> wdm_create+0x542/0x1720 drivers/usb/class/cdc-wdm.c:884 >> wdm_probe+0x220/0x2d0 drivers/usb/class/cdc-wdm.c:922 >> usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 >> really_probe+0x281/0x6d0 drivers/base/dd.c:548 >> driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 >> __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 >> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 >> __device_attach+0x217/0x360 drivers/base/dd.c:894 >> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 >> device_add+0xae6/0x16f0 drivers/base/core.c:2165 >> usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 >> generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 >> usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 >> really_probe+0x281/0x6d0 drivers/base/dd.c:548 >> driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 >> __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 >> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 >> __device_attach+0x217/0x360 drivers/base/dd.c:894 >> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 >> device_add+0xae6/0x16f0 drivers/base/core.c:2165 >> usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 >> hub_port_connect drivers/usb/core/hub.c:5098 [inline] >> hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] >> port_event drivers/usb/core/hub.c:5359 [inline] >> hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 >> process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 >> worker_thread+0x96/0xe20 kernel/workqueue.c:2415 >> kthread+0x318/0x420 kernel/kthread.c:255 >> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 >> The buggy address belongs to the object at ffff8881cbdca880 >> which belongs to the cache kmalloc-1k of size 1024 >> The buggy address is located 104 bytes inside of >> 1024-byte region [ffff8881cbdca880, ffff8881cbdcac80) >> The buggy address belongs to the page: >> page:ffffea00072f7200 refcount:1 mapcount:0 mapping:ffff8881da002280 >> index:0x0 compound_mapcount: 0 >> flags: 0x200000000010200(slab|head) >> raw: 0200000000010200 ffffea000719ca00 0000000400000004 ffff8881da002280 >> raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000 >> page dumped because: kasan: bad access detected >> Memory state around the buggy address: >> ffff8881cbdca780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ffff8881cbdca800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >> > ffff8881cbdca880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ^ >> ffff8881cbdca900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ffff8881cbdca980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ================================================================== >> --- >> 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. > Most probably the same issue as: > https://syzkaller.appspot.com/bug?id=07a5f1529b95adcb80cbf8729f9cb499b980991d > #syz dup: KASAN: use-after-free Read in wdm_out_callback Can't dup bug to itself.