From: syzbot <syzbot+87cfa083e727a224754b@syzkaller.appspotmail.com>
To: avagin@openvz.org, davem@davemloft.net, dingtianhong@huawei.com,
edumazet@google.com, elena.reshetova@intel.com,
jasowang@redhat.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, matthew@mjdsystems.ca,
mingo@kernel.org, mst@redhat.com, netdev@vger.kernel.org,
pabeni@redhat.com, syzkaller-bugs@googlegroups.com,
viro@zeniv.linux.org.uk,
virtualization@lists.linux-foundation.org, willemb@google.com
Subject: Re: KMSAN: uninit-value in _copy_to_iter (2)
Date: Wed, 25 Apr 2018 12:19:02 -0700 [thread overview]
Message-ID: <000000000000cf4578056ab12452@google.com> (raw)
In-Reply-To: <000000000000a5b2b1056a86e98c@google.com>
syzbot has found reproducer for the following crash on
https://github.com/google/kmsan.git/master commit
d2d741e5d1898dfde1a75ea3d29a9a3e2edf0617 (Sun Apr 22 15:05:22 2018 +0000)
kmsan: add initialization for shmem pages
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=87cfa083e727a224754b
So far this crash happened 3 times on
https://github.com/google/kmsan.git/master.
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5122017598636032
syzkaller reproducer:
https://syzkaller.appspot.com/x/repro.syz?id=6680049734385664
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=5920461749747712
Kernel config: https://syzkaller.appspot.com/x/.config?id=328654897048964367
compiler: clang version 7.0.0 (trunk 329391)
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+87cfa083e727a224754b@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed.
==================================================================
BUG: KMSAN: uninit-value in copyout lib/iov_iter.c:140 [inline]
BUG: KMSAN: uninit-value in _copy_to_iter+0x46d/0x28f0 lib/iov_iter.c:571
CPU: 1 PID: 4516 Comm: syz-executor879 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x185/0x1d0 lib/dump_stack.c:53
kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
kmsan_internal_check_memory+0x135/0x1e0 mm/kmsan/kmsan.c:1157
kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199
copyout lib/iov_iter.c:140 [inline]
_copy_to_iter+0x46d/0x28f0 lib/iov_iter.c:571
copy_to_iter include/linux/uio.h:106 [inline]
vhost_chr_read_iter+0x7ac/0xc50 drivers/vhost/vhost.c:1104
vhost_net_chr_read_iter+0xf6/0x130 drivers/vhost/net.c:1365
call_read_iter include/linux/fs.h:1776 [inline]
aio_read+0x5c1/0x6f0 fs/aio.c:1517
io_submit_one fs/aio.c:1633 [inline]
do_io_submit+0x1bb4/0x2f60 fs/aio.c:1698
SYSC_io_submit+0x98/0xb0 fs/aio.c:1723
SyS_io_submit+0x56/0x80 fs/aio.c:1720
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x4457b9
RSP: 002b:00007ff9343e4da8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00000000006dac44 RCX: 00000000004457b9
RDX: 00000000200001c0 RSI: 0000000000000001 RDI: 00007ff93439a000
RBP: 00000000006dac40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 901aeeff3a98f9ab
R13: 98c94b26f489688e R14: ae1b2dfa3c87200a R15: 0000000000000001
Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
__kmalloc+0x23c/0x350 mm/slub.c:3791
kmalloc include/linux/slab.h:517 [inline]
vhost_new_msg drivers/vhost/vhost.c:2340 [inline]
vhost_iotlb_miss drivers/vhost/vhost.c:1124 [inline]
translate_desc+0xbef/0x1120 drivers/vhost/vhost.c:1829
__vhost_get_user_slow drivers/vhost/vhost.c:812 [inline]
__vhost_get_user drivers/vhost/vhost.c:846 [inline]
vhost_update_used_flags+0x469/0x8d0 drivers/vhost/vhost.c:1715
vhost_vq_init_access+0x173/0xa20 drivers/vhost/vhost.c:1763
vhost_net_set_backend drivers/vhost/net.c:1166 [inline]
vhost_net_ioctl+0x22b0/0x3480 drivers/vhost/net.c:1322
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0xaf0/0x2440 fs/ioctl.c:686
SYSC_ioctl+0x1d2/0x260 fs/ioctl.c:701
SyS_ioctl+0x54/0x80 fs/ioctl.c:692
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Bytes 4-7 of 72 are uninitialized
==================================================================
next prev parent reply other threads:[~2018-04-25 19:19 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-23 16:56 KMSAN: uninit-value in _copy_to_iter (2) syzbot
2018-04-25 19:19 ` syzbot [this message]
2018-06-07 15:38 ` Michael S. Tsirkin
2018-06-07 15:38 ` Michael S. Tsirkin
2018-06-07 15:38 ` syzbot
2018-06-07 16:25 ` Dmitry Vyukov
2018-06-07 16:25 ` Dmitry Vyukov via Virtualization
2018-06-07 17:04 ` syzbot
2018-06-07 17:43 ` Al Viro
2018-06-07 17:43 ` Al Viro
2018-06-07 17:59 ` Michael S. Tsirkin
2018-06-07 17:59 ` Michael S. Tsirkin
2018-06-07 18:04 ` Al Viro
2018-06-07 18:04 ` Al Viro
2018-06-07 19:29 ` Michael S. Tsirkin
2018-06-07 19:29 ` Michael S. Tsirkin
2018-06-07 17:10 ` Michael S. Tsirkin
2018-06-07 17:31 ` syzbot
2018-06-07 17:10 ` Michael S. Tsirkin
2018-04-27 15:45 ` [PATCH net] vhost: Use kzalloc() to allocate vhost_msg_node Kevin Easton
2018-04-27 16:05 ` Michael S. Tsirkin
2018-04-27 16:11 ` Dmitry Vyukov
2018-04-27 16:11 ` Dmitry Vyukov via Virtualization
2018-04-27 16:15 ` Michael S. Tsirkin
2018-04-27 16:15 ` Michael S. Tsirkin
2018-04-27 16:25 ` Dmitry Vyukov
2018-04-27 16:29 ` Dmitry Vyukov
2018-04-27 16:29 ` Dmitry Vyukov via Virtualization
2018-04-27 16:25 ` Dmitry Vyukov via Virtualization
2018-04-27 19:36 ` Michael S. Tsirkin
2018-04-27 19:36 ` Michael S. Tsirkin
2018-04-29 8:10 ` Dmitry Vyukov
2018-04-29 8:10 ` Dmitry Vyukov via Virtualization
2018-04-28 1:07 ` Kevin Easton
2018-04-28 1:51 ` Kevin Easton
2018-04-28 2:23 ` Jason Wang
2018-04-28 2:23 ` Jason Wang
2018-04-27 16:05 ` Michael S. Tsirkin
2018-05-07 13:03 ` Michael S. Tsirkin
2018-05-07 13:12 ` Dmitry Vyukov via Virtualization
2018-05-07 13:12 ` Dmitry Vyukov
2018-05-08 8:27 ` Kevin Easton
2018-05-07 13:03 ` Michael S. Tsirkin
2018-05-29 22:19 ` [net] " Guenter Roeck
2018-05-29 22:19 ` Guenter Roeck
2018-05-30 3:01 ` Michael S. Tsirkin
2018-05-30 3:01 ` Michael S. Tsirkin
2018-05-30 3:42 ` Guenter Roeck
2018-05-30 3:42 ` Guenter Roeck
2018-06-04 12:34 ` Dmitry Vyukov
2018-06-04 12:34 ` Dmitry Vyukov via Virtualization
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