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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 EBF86C43387 for ; Fri, 4 Jan 2019 09:46:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF4B42184B for ; Fri, 4 Jan 2019 09:46:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727827AbfADJqE (ORCPT ); Fri, 4 Jan 2019 04:46:04 -0500 Received: from mail-it1-f200.google.com ([209.85.166.200]:54233 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727022AbfADJqE (ORCPT ); Fri, 4 Jan 2019 04:46:04 -0500 Received: by mail-it1-f200.google.com with SMTP id i12so549970ita.3 for ; Fri, 04 Jan 2019 01:46:03 -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=a3DMV1clYHpY3RXXWGtCPAX+8A23FuVFl51zxnc57NI=; b=mP9UTNBJVVbgPzN1rZKkWoVzWJN06kljaiEHDOnbSUSAixrHH+5xZa/D6NIymaN7QP hdH5RapNJAsiDCsEe3NgoRxYEFljOBeik8wuRzcohAk5cTb2FziZEAl4/BXPRpYxXAu/ JsWG4feK68HOZWViwTdQHISPo4+knTzP6EFKUU0ODzeFZg54C5LZ2nkWl0XsfJznP+8f 8nM37D+xLwrqyh0EWNQHJGVkQgrZPju9q6WKUYrAonN1nAMLiqbzXPbAZJ4vBAP4uYhE TwdIcIuIZiHCgY9yrCUBgezFoyB2B8GOfaKGFJSvNI5lMtr1IAyb3FN8GOWqurz/C+LQ Vbew== X-Gm-Message-State: AJcUukc/zFumtW52XWkFdBEb4bRxOsvZRMcKtH3gLh8E3dqIpT9pLUAk k+PMHJIYDmdMe+Fj/FWbxlkCziznc6w/RWecYuG5KBr650Wb X-Google-Smtp-Source: ALg8bN5rMM7PO2deYAQIYpr8nEu1hDXnj0SJowJcuNkyKni9/yClHe0xml1ugnSRnpJWRSXpUtHgyvjIYWO+0Jv1ELxsKlHEm3sz MIME-Version: 1.0 X-Received: by 2002:a6b:680a:: with SMTP id d10mr30523857ioc.35.1546595162720; Fri, 04 Jan 2019 01:46:02 -0800 (PST) Date: Fri, 04 Jan 2019 01:46:02 -0800 In-Reply-To: <000000000000a980e3057896e9df@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000491298057e9ebf6e@google.com> Subject: Re: KASAN: use-after-free Read in kobject_put From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org, 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: 645ff1e8e704 Merge branch 'for-linus' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=172cee4b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=7308e68273924137 dashboard link: https://syzkaller.appspot.com/bug?extid=fdc00003f4efff43bc5b compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15d603e7400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10786f77400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+fdc00003f4efff43bc5b@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in kobject_put+0xca/0xe0 lib/kobject.c:704 Read of size 1 at addr ffff88808f9e9ecc by task syz-executor111/8699 CPU: 1 PID: 8699 Comm: syz-executor111 Not tainted 4.20.0+ #8 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+0x1db/0x2d0 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_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132 kobject_put+0xca/0xe0 lib/kobject.c:704 put_device+0x20/0x30 drivers/base/core.c:2060 hci_free_dev+0x19/0x20 net/bluetooth/hci_core.c:3208 vhci_release+0x7e/0xf0 drivers/bluetooth/hci_vhci.c:355 __fput+0x3c5/0xb10 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x1f4/0x2b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x32a/0x3b0 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+0x696/0x800 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4054f1 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 94 17 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffeb26e56e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004054f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000000 R08: 000000037ffffa00 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000293 R12: 00000000006dbc2c R13: 20c49ba5e353f7cf R14: 000000000000002d R15: 0000000000000005 Allocated by task 8707: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc mm/kasan/common.c:482 [inline] kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3607 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] hci_alloc_dev+0x148/0x21a0 net/bluetooth/hci_core.c:3116 __vhci_create_device+0x101/0x5a0 drivers/bluetooth/hci_vhci.c:114 vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:219 [inline] vhci_write+0x2d0/0x470 drivers/bluetooth/hci_vhci.c:299 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8699: 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:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kfree+0xcf/0x230 mm/slab.c:3804 bt_host_release+0x19/0x30 net/bluetooth/hci_sysfs.c:86 device_release+0x7d/0x210 drivers/base/core.c:919 kobject_cleanup lib/kobject.c:662 [inline] kobject_release lib/kobject.c:691 [inline] kref_put include/linux/kref.h:67 [inline] kobject_put.cold+0x28f/0x2ec lib/kobject.c:708 put_device+0x20/0x30 drivers/base/core.c:2060 hci_dev_put include/net/bluetooth/hci_core.h:1014 [inline] hci_unregister_dev+0x716/0x980 net/bluetooth/hci_core.c:3379 vhci_release+0x76/0xf0 drivers/bluetooth/hci_vhci.c:354 __fput+0x3c5/0xb10 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x1f4/0x2b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x32a/0x3b0 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+0x696/0x800 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808f9e8e00 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4300 bytes inside of 8192-byte region [ffff88808f9e8e00, ffff88808f9eae00) The buggy address belongs to the page: page:ffffea00023e7a00 count:1 mapcount:0 mapping:ffff88812c3f2080 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00023e6808 ffffea00023e8408 ffff88812c3f2080 raw: 0000000000000000 ffff88808f9e8e00 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected kobject: 'rfkill468' (000000007192bbb6): kobject_cleanup, parent (null) Memory state around the buggy address: ffff88808f9e9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808f9e9e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88808f9e9e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808f9e9f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808f9e9f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== kobject: 'rfkill471' (00000000171c66a4): kobject_add_internal: parent: 'hci2', set: 'devices' kobject: 'rfkill471' (00000000171c66a4): kobject_uevent_env kobject: 'hci6' (00000000cea6c5b0): fill_kobj_path: path = '/devices/virtual/bluetooth/hci6' kobject: 'hci5' (00000000d9130f82): kobject_uevent_env kobject: 'rfkill468' (000000007192bbb6): calling ktype release kobject: 'hci5' (00000000d9130f82): fill_kobj_path: path = '/devices/virtual/bluetooth/hci5' kobject: 'rfkill468': free name kobject: 'rfkill471' (00000000171c66a4): fill_kobj_path: path = '/devices/virtual/bluetooth/hci2/rfkill471' kobject: 'hci1' (000000006eef9329): kobject_uevent_env kobject: 'rfkill472' (000000003d2f7a84): kobject_add_internal: parent: 'hci0', set: 'devices' kobject: 'hci1' (000000006eef9329): fill_kobj_path: path = '/devices/virtual/bluetooth/hci1' kobject: 'rfkill469' (0000000043e5b34a): kobject_uevent_env kobject: 'hci1' (000000006eef9329): kobject_cleanup, parent (null) kobject: 'rfkill469' (0000000043e5b34a): fill_kobj_path: path = '/devices/virtual/bluetooth/hci3/rfkill469' kobject: 'hci1' (000000006eef9329): calling ktype release kobject: 'rfkill472' (000000003d2f7a84): kobject_uevent_env kobject: 'rfkill470' (00000000155e553b): kobject_uevent_env kobject: 'rfkill472' (000000003d2f7a84): fill_kobj_path: path = '/devices/virtual/bluetooth/hci0/rfkill472' kobject: 'rfkill470' (00000000155e553b): fill_kobj_path: path = '/devices/virtual/bluetooth/hci4/rfkill470' kobject: 'rfkill473' (0000000082665f74): kobject_add_internal: parent: 'hci6', set: 'devices' kobject: 'hci1': free name kobject: 'rfkill473' (0000000082665f74): kobject_uevent_env kobject: 'hci1' (00000000a68c12d6): kobject_add_internal: parent: 'bluetooth', set: 'devices' kobject: 'rfkill472' (000000003d2f7a84): kobject_uevent_env kobject: 'hci1' (00000000a68c12d6): kobject_uevent_env kobject: 'rfkill472' (000000003d2f7a84): fill_kobj_path: path = '/devices/virtual/bluetooth/hci0/rfkill472' kobject: 'hci1' (00000000a68c12d6): fill_kobj_path: path = '/devices/virtual/bluetooth/hci1' kobject: 'rfkill473' (0000000082665f74): fill_kobj_path: path = '/devices/virtual/bluetooth/hci6/rfkill473'