================================================================== 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 ffff88809184f710 by task syz-executor1/21727 CPU: 1 PID: 21727 Comm: syz-executor1 Not tainted 5.0.0-rc1+ #20 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 kvm_vm_compat_ioctl+0x13c/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3301 __do_compat_sys_ioctl fs/compat_ioctl.c:1052 [inline] __se_compat_sys_ioctl fs/compat_ioctl.c:998 [inline] __ia32_compat_sys_ioctl+0x197/0x620 fs/compat_ioctl.c:998 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x333/0xf98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fa0869 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 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:00000000f5f9c0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000c018aec0 RDX: 00000000200000c0 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 21727: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 __do_kmalloc_node mm/slab.c:3673 [inline] __kmalloc_node+0x4e/0x70 mm/slab.c:3680 kmalloc_node include/linux/slab.h:588 [inline] kvmalloc_node+0x68/0x100 mm/util.c:416 kvmalloc include/linux/mm.h:604 [inline] kvzalloc include/linux/mm.h:612 [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 kvm_vm_compat_ioctl+0x13c/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3301 __do_compat_sys_ioctl fs/compat_ioctl.c:1052 [inline] __se_compat_sys_ioctl fs/compat_ioctl.c:998 [inline] __ia32_compat_sys_ioctl+0x197/0x620 fs/compat_ioctl.c:998 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x333/0xf98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 7719: 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:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 apparmor_sk_free_security+0xd9/0x120 security/apparmor/lsm.c:791 security_sk_free+0x47/0x90 security/security.c:1495 sk_prot_free net/core/sock.c:1510 [inline] __sk_destruct+0x6d4/0xa60 net/core/sock.c:1596 sk_destruct+0x7b/0x90 net/core/sock.c:1604 __sk_free+0xce/0x300 net/core/sock.c:1615 sk_free+0x42/0x50 net/core/sock.c:1626 sock_put include/net/sock.h:1707 [inline] tcp_close+0xcb8/0x1200 net/ipv4/tcp.c:2488 inet_release+0x105/0x1f0 net/ipv4/af_inet.c:428 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:461 __sock_release+0xd3/0x250 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1141 __fput+0x3c5/0xb10 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x1f4/0x2b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x32a/0x3b0 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+0xc97/0xf98 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 ffff88809184f700 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff88809184f700, ffff88809184f720) The buggy address belongs to the page: page:ffffea00024613c0 count:1 mapcount:0 mapping:ffff88812c3f01c0 index:0xffff88809184ffc1 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00029148c8 ffffea0002a17688 ffff88812c3f01c0 raw: ffff88809184ffc1 ffff88809184f000 0000000100000033 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809184f600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88809184f680: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc >ffff88809184f700: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff88809184f780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88809184f800: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================