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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, 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 A9C93C54EEB for ; Sun, 22 Mar 2020 22:10:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D42320722 for ; Sun, 22 Mar 2020 22:10:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726945AbgCVWKP (ORCPT ); Sun, 22 Mar 2020 18:10:15 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:40171 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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MIME-Version: 1.0 X-Received: by 2002:a92:6b0f:: with SMTP id g15mr12326695ilc.69.1584915013914; Sun, 22 Mar 2020 15:10:13 -0700 (PDT) Date: Sun, 22 Mar 2020 15:10:13 -0700 In-Reply-To: <000000000000e9e518059fd84189@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006758f505a178c84f@google.com> Subject: Re: KASAN: use-after-free Write in hci_sock_bind (2) From: syzbot To: davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" 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: 770fbb32 Add linux-next specific files for 20200228 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=108618ade00000 kernel config: https://syzkaller.appspot.com/x/.config?x=576314276bce4ad5 dashboard link: https://syzkaller.appspot.com/bug?extid=04e804c8c2224b6a9497 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11fc5e75e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10707013e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+04e804c8c2224b6a9497@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] BUG: KASAN: use-after-free in hci_sock_bind+0x591/0x1140 net/bluetooth/hci_sock.c:1250 Write of size 4 at addr ffff888089679078 by task syz-executor918/10028 CPU: 1 PID: 10028 Comm: syz-executor918 Not tainted 5.6.0-rc3-next-20200228-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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:618 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x128/0x190 mm/kasan/generic.c:192 instrument_atomic_write include/linux/instrumented.h:71 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] hci_sock_bind+0x591/0x1140 net/bluetooth/hci_sock.c:1250 __sys_bind+0x20e/0x250 net/socket.c:1662 __do_sys_bind net/socket.c:1673 [inline] __se_sys_bind net/socket.c:1671 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1671 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4435a9 Code: e8 1c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 ab 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd328c7b48 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004435a9 RDX: 0000000000000006 RSI: 0000000020000080 RDI: 0000000000000006 RBP: 0000000000000005 R08: 00000000000003e8 R09: 00000000000003e8 R10: 00000000000003e8 R11: 0000000000000246 R12: 0000000000dc6914 R13: 000000000000000b R14: 0000000000000000 R15: 0000000000000000 Allocated by task 10029: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:492 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:465 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] hci_alloc_dev+0x3e/0x1e20 net/bluetooth/hci_core.c:3249 __vhci_create_device+0x100/0x5b0 drivers/bluetooth/hci_vhci.c:99 vhci_create_device drivers/bluetooth/hci_vhci.c:148 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:205 [inline] vhci_write+0x2bf/0x450 drivers/bluetooth/hci_vhci.c:285 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write+0x49c/0x700 fs/read_write.c:483 __vfs_write+0xc9/0x100 fs/read_write.c:496 vfs_write+0x262/0x5c0 fs/read_write.c:558 ksys_write+0x127/0x250 fs/read_write.c:611 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 10029: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:314 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:453 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 bt_host_release+0x15/0x20 net/bluetooth/hci_sysfs.c:86 device_release+0x71/0x200 drivers/base/core.c:1358 kobject_cleanup lib/kobject.c:693 [inline] kobject_release lib/kobject.c:722 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e7/0x2e0 lib/kobject.c:739 put_device+0x1b/0x30 drivers/base/core.c:2586 vhci_release+0x78/0xe0 drivers/bluetooth/hci_vhci.c:341 __fput+0x2da/0x850 fs/file_table.c:280 task_work_run+0x13f/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2fa/0x360 arch/x86/entry/common.c:165 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x672/0x790 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888089678000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4216 bytes inside of 8192-byte region [ffff888089678000, ffff88808967a000) The buggy address belongs to the page: page:ffffea0002259e00 refcount:1 mapcount:0 mapping:00000000baf255d8 index:0x0 head:ffffea0002259e00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0002a19608 ffffea0002500e08 ffff8880aa0021c0 raw: 0000000000000000 ffff888089678000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888089678f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888089678f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888089679000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888089679080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888089679100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================