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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 0E701C7618B for ; Thu, 25 Jul 2019 09:44:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CAA1D2190F for ; Thu, 25 Jul 2019 09:44:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390660AbfGYJoO convert rfc822-to-8bit (ORCPT ); Thu, 25 Jul 2019 05:44:14 -0400 Received: from coyote.holtmann.net ([212.227.132.17]:41049 "EHLO mail.holtmann.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727601AbfGYJoO (ORCPT ); Thu, 25 Jul 2019 05:44:14 -0400 Received: from marcel-macbook.fritz.box (p5B3D2BA7.dip0.t-ipconnect.de [91.61.43.167]) by mail.holtmann.org (Postfix) with ESMTPSA id 596F3CED29; Thu, 25 Jul 2019 11:52:49 +0200 (CEST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: KASAN: use-after-free Read in h5_rx_3wire_hdr From: Marcel Holtmann In-Reply-To: Date: Thu, 25 Jul 2019 11:44:12 +0200 Cc: Johan Hedberg , linux-bluetooth , LKML , syzkaller-bugs , syzbot Content-Transfer-Encoding: 8BIT Message-Id: <500EB100-0253-4934-80FD-689C32ED310C@holtmann.org> References: <0000000000003fd4ab058e46951f@google.com> To: Dmitry Vyukov X-Mailer: Apple Mail (2.3445.104.11) Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Hi Dmitry, >> syzbot found the following crash on: >> >> HEAD commit: 6d21a41b Add linux-next specific files for 20190718 >> git tree: linux-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=1377958fa00000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=3430a151e1452331 >> dashboard link: https://syzkaller.appspot.com/bug?extid=0abbda0523882250a97a >> compiler: gcc (GCC) 9.0.0 20181231 (experimental) >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=113e2bb7a00000 > > +drivers/bluetooth/hci_h5.c maintainers > >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+0abbda0523882250a97a@syzkaller.appspotmail.com >> >> ================================================================== >> BUG: KASAN: use-after-free in h5_rx_3wire_hdr+0x35d/0x3c0 >> /drivers/bluetooth/hci_h5.c:438 >> Read of size 1 at addr ffff8880a161d1c8 by task syz-executor.4/12040 >> >> CPU: 1 PID: 12040 Comm: syz-executor.4 Not tainted 5.2.0-next-20190718 #41 >> 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+0x172/0x1f0 /lib/dump_stack.c:113 >> print_address_description.cold+0xd4/0x306 /mm/kasan/report.c:351 >> __kasan_report.cold+0x1b/0x36 /mm/kasan/report.c:482 >> kasan_report+0x12/0x17 /mm/kasan/common.c:612 >> __asan_report_load1_noabort+0x14/0x20 /mm/kasan/generic_report.c:129 >> h5_rx_3wire_hdr+0x35d/0x3c0 /drivers/bluetooth/hci_h5.c:438 >> h5_recv+0x32f/0x500 /drivers/bluetooth/hci_h5.c:563 >> hci_uart_tty_receive+0x279/0x790 /drivers/bluetooth/hci_ldisc.c:600 >> tiocsti /drivers/tty/tty_io.c:2197 [inline] >> tty_ioctl+0x949/0x14f0 /drivers/tty/tty_io.c:2573 >> vfs_ioctl /fs/ioctl.c:46 [inline] >> file_ioctl /fs/ioctl.c:509 [inline] >> do_vfs_ioctl+0xdb6/0x13e0 /fs/ioctl.c:696 >> ksys_ioctl+0xab/0xd0 /fs/ioctl.c:713 >> __do_sys_ioctl /fs/ioctl.c:720 [inline] >> __se_sys_ioctl /fs/ioctl.c:718 [inline] >> __x64_sys_ioctl+0x73/0xb0 /fs/ioctl.c:718 >> do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 >> entry_SYSCALL_64_after_hwframe+0x49/0xbe >> RIP: 0033:0x459819 >> Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 >> RSP: 002b:00007f7a3b459c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 >> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459819 >> RDX: 0000000020000080 RSI: 0000000000005412 RDI: 0000000000000003 >> RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7a3b45a6d4 >> R13: 00000000004c408a R14: 00000000004d7ff0 R15: 00000000ffffffff Is this happening on specific hardware? Regards Marcel