From: syzbot <syzbot+7416b988c249396c5e2c@syzkaller.appspotmail.com>
To: daniel.vetter@ffwll.ch, ghalat@redhat.com,
gregkh@linuxfoundation.org, jslaby@suse.com,
linux-kernel@vger.kernel.org, nico@fluxnic.net, sam@ravnborg.org,
syzkaller-bugs@googlegroups.com, textshell@uchuujin.de
Subject: KASAN: null-ptr-deref Read in insert_char
Date: Thu, 09 Jan 2020 00:09:11 -0800 [thread overview]
Message-ID: <00000000000038e517059bb08615@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: b07f636f Merge tag 'tpmdd-next-20200108' of git://git.infr..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16214d15e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=18698c0c240ba616
dashboard link: https://syzkaller.appspot.com/bug?extid=7416b988c249396c5e2c
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+7416b988c249396c5e2c@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: null-ptr-deref in memmove include/linux/string.h:395 [inline]
BUG: KASAN: null-ptr-deref in scr_memmovew include/linux/vt_buffer.h:68
[inline]
BUG: KASAN: null-ptr-deref in insert_char+0x206/0x400
drivers/tty/vt/vt.c:839
Read of size 4294967294 at addr 0000000000000010 by task
syz-executor.1/10976
CPU: 0 PID: 10976 Comm: syz-executor.1 Not tainted 5.5.0-rc5-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+0x197/0x210 lib/dump_stack.c:118
__kasan_report.cold+0x5/0x41 mm/kasan/report.c:510
kasan_report+0x12/0x20 mm/kasan/common.c:639
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
memmove+0x24/0x50 mm/kasan/common.c:116
memmove include/linux/string.h:395 [inline]
scr_memmovew include/linux/vt_buffer.h:68 [inline]
insert_char+0x206/0x400 drivers/tty/vt/vt.c:839
csi_at drivers/tty/vt/vt.c:1964 [inline]
do_con_trol+0x41a6/0x61b0 drivers/tty/vt/vt.c:2431
do_con_write.part.0+0xfd9/0x1ef0 drivers/tty/vt/vt.c:2797
do_con_write drivers/tty/vt/vt.c:2565 [inline]
con_write+0x46/0xd0 drivers/tty/vt/vt.c:3135
process_output_block drivers/tty/n_tty.c:595 [inline]
n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333
do_tty_write drivers/tty/tty_io.c:962 [inline]
tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046
__vfs_write+0x8a/0x110 fs/read_write.c:494
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f540b476c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f540b4776d4
R13: 00000000004cce19 R14: 00000000004e81c0 R15: 00000000ffffffff
==================================================================
---
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.
next reply other threads:[~2020-01-09 8:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-09 8:09 syzbot [this message]
2020-01-09 9:04 ` KASAN: null-ptr-deref Read in insert_char syzbot
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