================================================================== BUG: KASAN: slab-out-of-bounds in kvm_clear_dirty_log_protect+0x8cf/0x970 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1261 Read of size 8 at addr ffff8880a89d5010 by task syz-executor3/29438 CPU: 0 PID: 29438 Comm: syz-executor3 Not tainted 4.20.0+ #10 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 kvm_clear_dirty_log_protect+0x8cf/0x970 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1261 kvm_vm_ioctl_clear_dirty_log+0xff/0x260 arch/x86/kvm/x86.c:4468 kvm_vm_ioctl+0xc19/0x1fe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3126 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fac45ffec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000020000080 RSI: 00000000c018aec0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fac45fff6d4 R13: 00000000004ca068 R14: 00000000004d2b90 R15: 00000000ffffffff Allocated by task 29438: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc mm/kasan/common.c:482 [inline] kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455 __do_kmalloc_node mm/slab.c:3671 [inline] __kmalloc_node+0x4e/0x70 mm/slab.c:3678 kmalloc_node include/linux/slab.h:588 [inline] kvmalloc_node+0x68/0x100 mm/util.c:416 kvmalloc include/linux/mm.h:602 [inline] kvzalloc include/linux/mm.h:610 [inline] kvm_create_dirty_bitmap arch/x86/kvm/../../../virt/kvm/kvm_main.c:792 [inline] __kvm_set_memory_region+0x1da1/0x2c40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1017 kvm_set_memory_region+0x2f/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1083 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1095 [inline] kvm_vm_ioctl+0xafa/0x1fe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3107 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8028: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kfree+0xcf/0x230 mm/slab.c:3804 kvfree+0x61/0x70 mm/util.c:445 translate_table+0xc24/0x1890 net/ipv6/netfilter/ip6_tables.c:732 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline] do_ip6t_set_ctl+0x3cd/0x659 net/ipv6/netfilter/ip6_tables.c:1684 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x7d/0xd0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt net/ipv6/ipv6_sockglue.c:945 [inline] ipv6_setsockopt+0x144/0x170 net/ipv6/ipv6_sockglue.c:929 tcp_setsockopt net/ipv4/tcp.c:3068 [inline] tcp_setsockopt+0x95/0xf0 net/ipv4/tcp.c:3062 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2991 __sys_setsockopt+0x1b0/0x3a0 net/socket.c:1902 __do_sys_setsockopt net/socket.c:1913 [inline] __se_sys_setsockopt net/socket.c:1910 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1910 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a89d5000 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8880a89d5000, ffff8880a89d5020) The buggy address belongs to the page: page:ffffea0002a27540 count:1 mapcount:0 mapping:ffff88812c3f01c0 index:0xffff8880a89d5fc1 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00023f11c8 ffffea0002300208 ffff88812c3f01c0 raw: ffff8880a89d5fc1 ffff8880a89d5000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a89d4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a89d4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 kobject: 'loop4' (00000000ce1d11ba): kobject_uevent_env >ffff8880a89d5000: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8880a89d5080: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a89d5100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================