On Tue, Aug 28, 2018 at 11:11:21AM -0400, Michael S. Tsirkin wrote: > On Tue, Aug 28, 2018 at 07:44:03AM -0700, syzbot wrote: > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 33e17876ea4e Merge branch 'akpm' (patches from Andrew) > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=12d8a20a400000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=40e5d6b26b73cd5b > > dashboard link: https://syzkaller.appspot.com/bug?extid=d5a0a170c5069658b141 > > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > userspace arch: i386 > > > > 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+d5a0a170c5069658b141@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > ================================================================== > > BUG: KASAN: use-after-free in vhost_work_queue+0xc3/0xe0 > > drivers/vhost/vhost.c:258 > > Read of size 8 at addr ffff880193862068 by task syz-executor7/22100 > > > > CPU: 0 PID: 22100 Comm: syz-executor7 Not tainted 4.18.0+ #108 > > 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+0x1c9/0x2b4 lib/dump_stack.c:113 > > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > > kasan_report_error mm/kasan/report.c:354 [inline] > > kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 > > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > > vhost_work_queue+0xc3/0xe0 drivers/vhost/vhost.c:258 > > vhost_transport_send_pkt+0x28a/0x380 drivers/vhost/vsock.c:227 > > virtio_transport_send_pkt_info+0x31d/0x460 > > net/vmw_vsock/virtio_transport_common.c:190 > > virtio_transport_shutdown+0x1b1/0x270 > > net/vmw_vsock/virtio_transport_common.c:604 > > vsock_send_shutdown net/vmw_vsock/af_vsock.c:451 [inline] > > vsock_shutdown+0x229/0x290 net/vmw_vsock/af_vsock.c:849 > > __sys_shutdown+0x15c/0x2c0 net/socket.c:1964 > > __do_sys_shutdown net/socket.c:1972 [inline] > > __se_sys_shutdown net/socket.c:1970 [inline] > > __ia32_sys_shutdown+0x54/0x80 net/socket.c:1970 > > do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] > > do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 > > entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 > > RIP: 0023:0xf7fa4ca9 > > Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b > > 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 > > 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 > > RSP: 002b:00000000f5f7f0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000175 > > RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000000000000 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > > > > Allocated by task 22094: > > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > > set_track mm/kasan/kasan.c:460 [inline] > > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > > __do_kmalloc_node mm/slab.c:3682 [inline] > > __kmalloc_node+0x47/0x70 mm/slab.c:3689 > > kmalloc_node include/linux/slab.h:555 [inline] > > kvmalloc_node+0xb9/0xf0 mm/util.c:423 > > kvmalloc include/linux/mm.h:577 [inline] > > vhost_vsock_dev_open+0xa2/0x5a0 drivers/vhost/vsock.c:511 > > misc_open+0x3ca/0x560 drivers/char/misc.c:141 > > chrdev_open+0x25a/0x770 fs/char_dev.c:417 > > do_dentry_open+0x49c/0x1140 fs/open.c:771 > > vfs_open+0xa0/0xd0 fs/open.c:880 > > do_last fs/namei.c:3418 [inline] > > path_openat+0x12fb/0x5300 fs/namei.c:3534 > > do_filp_open+0x255/0x380 fs/namei.c:3564 > > do_sys_open+0x584/0x720 fs/open.c:1063 > > __do_compat_sys_openat fs/open.c:1109 [inline] > > __se_compat_sys_openat fs/open.c:1107 [inline] > > __ia32_compat_sys_openat+0x98/0xf0 fs/open.c:1107 > > do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] > > do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 > > entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 > > > > Freed by task 22093: > > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > > set_track mm/kasan/kasan.c:460 [inline] > > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 > > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > > __cache_free mm/slab.c:3498 [inline] > > kfree+0xd9/0x210 mm/slab.c:3813 > > kvfree+0x61/0x70 mm/util.c:449 > > vhost_vsock_free drivers/vhost/vsock.c:499 [inline] > > vhost_vsock_dev_release+0x4fd/0x750 drivers/vhost/vsock.c:604 > > __fput+0x36e/0x8c0 fs/file_table.c:278 > > ____fput+0x15/0x20 fs/file_table.c:309 > > task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 > > tracehook_notify_resume include/linux/tracehook.h:193 [inline] > > exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 > > prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] > > syscall_return_slowpath arch/x86/entry/common.c:268 [inline] > > do_syscall_32_irqs_on arch/x86/entry/common.c:341 [inline] > > do_fast_syscall_32+0xcd5/0xfb2 arch/x86/entry/common.c:397 > > entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 > > > > The buggy address belongs to the object at ffff880193861fc0 > > which belongs to the cache kmalloc-65536 of size 65536 > > The buggy address is located 168 bytes inside of > > 65536-byte region [ffff880193861fc0, ffff880193871fc0) > > The buggy address belongs to the page: > > page:ffffea00064e1800 count:1 mapcount:0 mapping:ffff8801dac02500 index:0x0 > > compound_mapcount: 0 > > flags: 0x2fffc0000008100(slab|head) > > raw: 02fffc0000008100 ffffea00064c7008 ffffea00064e5008 ffff8801dac02500 > > raw: 0000000000000000 ffff880193861fc0 0000000100000001 0000000000000000 > > page dumped because: kasan: bad access detected > > > > Memory state around the buggy address: > > ffff880193861f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > ffff880193861f80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb > > > ffff880193862000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ^ > > ffff880193862080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff880193862100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ================================================================== > > Seems like a duplicate of the bug Stefan's working on now. I am currently away on leave and not working on fixes. Please contact Cathy about vsock syzkaller bugs while I'm away. Stefan
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