linux-kernel - KMSAN: uninit-value in synaptics

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Thu, 20 Sep 2018 14:04:04 -0700
From:   syzbot <syzbot+13cb3b01d0784e4ffc3f@...kaller.appspotmail.com>
To:     aaron.ma@...onical.com, aduggan@...aptics.com,
        benjamin.tissoires@...hat.com, dmitry.torokhov@...il.com,
        kt.liao@....com.tw, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, peter.hutterer@...-t.net,
        rydberg@...math.org, syzkaller-bugs@...glegroups.com,
        zhenjie.wang@...u.edu.cn
Subject: KMSAN: uninit-value in synaptics_detect

Hello,

syzbot found the following crash on:

HEAD commit:    42a037ca8d9d kmsan: update README.md to reference LLVM r34..
git tree:       https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=1392c149400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3431f03869413153
dashboard link: https://syzkaller.appspot.com/bug?extid=13cb3b01d0784e4ffc3f
compiler:       clang version 8.0.0 (trunk 339414)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14616421400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16a164d1400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+13cb3b01d0784e4ffc3f@...kaller.appspotmail.com

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
psmouse serio2: Failed to reset mouse on : -5
misc userio: Buffer overflowed, userio client isn't keeping up
==================================================================
BUG: KMSAN: uninit-value in synaptics_detect+0x1fa/0x2a0  
drivers/input/mouse/synaptics.c:112
CPU: 1 PID: 41 Comm: kworker/1:2 Not tainted 4.19.0-rc1+ #42
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: events_long serio_handle_event
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x14b/0x190 lib/dump_stack.c:113
  kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956
  __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645
  synaptics_detect+0x1fa/0x2a0 drivers/input/mouse/synaptics.c:112
  psmouse_do_detect drivers/input/mouse/psmouse-base.c:1011 [inline]
  psmouse_extensions+0x10fd/0x3820 drivers/input/mouse/psmouse-base.c:1106
  psmouse_switch_protocol+0x184/0xd90 drivers/input/mouse/psmouse-base.c:1544
  psmouse_connect+0x1387/0x2290 drivers/input/mouse/psmouse-base.c:1634
  serio_connect_driver drivers/input/serio/serio.c:59 [inline]
  serio_driver_probe+0xe3/0x150 drivers/input/serio/serio.c:790
  really_probe+0x19ae/0x2040 drivers/base/dd.c:500
  driver_probe_device+0x1b4/0x4f0 drivers/base/dd.c:662
  __device_attach_driver+0x632/0x750 drivers/base/dd.c:758
  bus_for_each_drv+0x27e/0x390 drivers/base/bus.c:461
  __device_attach+0x381/0x5e0 drivers/base/dd.c:815
  device_initial_probe+0x4a/0x60 drivers/base/dd.c:862
  bus_probe_device+0x137/0x390 drivers/base/bus.c:521
  device_add+0x2687/0x2c70 drivers/base/core.c:1927
  serio_add_port drivers/input/serio/serio.c:554 [inline]
  serio_handle_event+0x1d90/0x2700 drivers/input/serio/serio.c:222
  process_one_work+0x1605/0x1f40 kernel/workqueue.c:2153
  worker_thread+0x11a2/0x2590 kernel/workqueue.c:2296
  kthread+0x465/0x4a0 kernel/kthread.c:247
  ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:416

Local variable description: ----param@...aptics_detect
Variable was created at:
  synaptics_detect+0x50/0x2a0 drivers/input/mouse/synaptics.c:100
  psmouse_do_detect drivers/input/mouse/psmouse-base.c:1011 [inline]
  psmouse_extensions+0x10fd/0x3820 drivers/input/mouse/psmouse-base.c:1106
==================================================================


---
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@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with  
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches