1 FILE: drivers/vhost/vhost.c 2 3 ================================================================== 4 BUG: KASAN: use-after-free in __list_add_valid+0xb1/0xd0 lib/list_debug.c:23 5 Read of size 8 at addr ffff8801bb5893d0 by task syz-executor1/28911 6 7 CPU: 0 PID: 28911 Comm: syz-executor1 Not tainted 4.15.0-rc9+ #277 8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 9 Call Trace: 10 __dump_stack lib/dump_stack.c:17 [inline] 11 dump_stack+0x194/0x257 lib/dump_stack.c:53 12 print_address_description+0x73/0x250 mm/kasan/report.c:252 13 kasan_report_error mm/kasan/report.c:351 [inline] 14 kasan_report+0x25b/0x340 mm/kasan/report.c:409 15 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 16 __list_add_valid+0xb1/0xd0 lib/list_debug.c:23 17 __list_add include/linux/list.h:60 [inline] 18 list_add include/linux/list.h:79 [inline] 19 __add_wait_queue include/linux/wait.h:156 [inline] 20 add_wait_queue+0xcf/0x290 kernel/sched/wait.c:30 21 vhost_poll_func+0x3d/0x50 drivers/vhost/vhost.c:165 22 poll_wait include/linux/poll.h:46 [inline] 23 eventfd_poll+0xe8/0x1f0 fs/eventfd.c:123 24 vhost_poll_start+0x97/0x1c0 drivers/vhost/vhost.c:212 25 vhost_vring_ioctl+0xe28/0x19b0 drivers/vhost/vhost.c:1556 26 vhost_net_ioctl+0x9df/0x1910 drivers/vhost/net.c:1320 27 vfs_ioctl fs/ioctl.c:46 [inline] 28 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 29 SYSC_ioctl fs/ioctl.c:701 [inline] 30 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 31 entry_SYSCALL_64_fastpath+0x29/0xa0 32 RIP: 0033:0x452f19 33 RSP: 002b:00007f33da20dc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 34 RAX: ffffffffffffffda RBX: 00007f33da20e700 RCX: 0000000000452f19 35 RDX: 00000000208ffff8 RSI: 000000004008af20 RDI: 0000000000000017 36 RBP: 0000000000a2f850 R08: 0000000000000000 R09: 0000000000000000 37 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 38 R13: 0000000000a2f7cf R14: 00007f33da20e9c0 R15: 0000000000000006 39 40 Allocated by task 28878: 41 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 42 set_track mm/kasan/kasan.c:459 [inline] 43 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 44 __do_kmalloc_node mm/slab.c:3672 [inline] 45 __kmalloc_node+0x47/0x70 mm/slab.c:3679 46 kmalloc_node include/linux/slab.h:541 [inline] 47 kvmalloc_node+0x64/0xd0 mm/util.c:397 48 kvmalloc include/linux/mm.h:541 [inline] 49 vhost_net_open+0x27/0x670 drivers/vhost/net.c:902 50 misc_open+0x382/0x500 drivers/char/misc.c:154 51 chrdev_open+0x257/0x730 fs/char_dev.c:417 52 do_dentry_open+0x667/0xd40 fs/open.c:752 53 vfs_open+0x107/0x220 fs/open.c:866 54 do_last fs/namei.c:3379 [inline] 55 path_openat+0x1151/0x3530 fs/namei.c:3519 56 do_filp_open+0x25b/0x3b0 fs/namei.c:3554 57 do_sys_open+0x502/0x6d0 fs/open.c:1059 58 SYSC_openat fs/open.c:1086 [inline] 59 SyS_openat+0x30/0x40 fs/open.c:1080 60 entry_SYSCALL_64_fastpath+0x29/0xa0 61 62 Freed by task 28878: 63 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 64 set_track mm/kasan/kasan.c:459 [inline] 65 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 66 __cache_free mm/slab.c:3488 [inline] 67 kfree+0xd6/0x260 mm/slab.c:3803 68 kvfree+0x36/0x60 mm/util.c:416 69 vhost_net_release+0x159/0x190 drivers/vhost/net.c:1012 70 __fput+0x327/0x7e0 fs/file_table.c:210 71 ____fput+0x15/0x20 fs/file_table.c:244 72 task_work_run+0x199/0x270 kernel/task_work.c:113 73 tracehook_notify_resume include/linux/tracehook.h:191 [inline] 74 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162 75 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] 76 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 77 entry_SYSCALL_64_fastpath+0x9e/0xa0 78 79 The buggy address belongs to the object at ffff8801bb589140 80 which belongs to the cache kmalloc-65536 of size 65536 81 The buggy address is located 656 bytes inside of 82 65536-byte region [ffff8801bb589140, ffff8801bb599140) 83 The buggy address belongs to the page: 84 page:ffffea0006ed6000 count:1 mapcount:0 mapping:ffff8801bb589140 index:0x0 compound_mapcount: 0 85 flags: 0x2fffc0000008100(slab|head) 86 raw: 02fffc0000008100 ffff8801bb589140 0000000000000000 0000000100000001 87 raw: ffffea00068b0820 ffffea000693d020 ffff8801dac02500 0000000000000000 88 page dumped because: kasan: bad access detected 89 90 Memory state around the buggy address: 91 ffff8801bb589280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 92 ffff8801bb589300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 93 ffff8801bb589380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 94 ^ 95 ffff8801bb589400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 96 ffff8801bb589480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 97 ================================================================== 98
