================================================================== BUG: KASAN: slab-out-of-bounds in search_memslots include/linux/kvm_host.h:1051 [inline] BUG: KASAN: slab-out-of-bounds in __gfn_to_memslot include/linux/kvm_host.h:1063 [inline] BUG: KASAN: slab-out-of-bounds in __kvm_gfn_to_hva_cache_init+0x5fb/0x670 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2443 Read of size 8 at addr ffff8880a8063468 by task syz-executor.2/6857 CPU: 1 PID: 6857 Comm: syz-executor.2 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x33/0x50 mm/kasan/common.c:625 search_memslots include/linux/kvm_host.h:1051 [inline] __gfn_to_memslot include/linux/kvm_host.h:1063 [inline] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2443 kvm_lapic_set_vapic_addr+0x88/0x180 arch/x86/kvm/lapic.c:2662 kvm_arch_vcpu_ioctl+0xf0d/0x2c00 arch/x86/kvm/x86.c:4386 kvm_vcpu_ioctl+0x866/0xe60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3291 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa08c918c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e8740 RCX: 000000000045ca29 RDX: 0000000020000000 RSI: 000000004008ae93 RDI: 0000000000000007 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003e4 R14: 00000000004c697c R15: 00007fa08c9196d4 Allocated by task 6857: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:757 [inline] kvzalloc include/linux/mm.h:765 [inline] kvm_dup_memslots arch/x86/kvm/../../../virt/kvm/kvm_main.c:1101 [inline] kvm_set_memslot+0x115/0x1530 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 __kvm_set_memory_region+0xcf7/0x1320 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1300 __x86_set_memory_region+0x2a3/0x5a0 arch/x86/kvm/x86.c:9856 alloc_apic_access_page arch/x86/kvm/vmx/vmx.c:3540 [inline] vmx_create_vcpu+0x2107/0x2b40 arch/x86/kvm/vmx/vmx.c:6799 kvm_arch_vcpu_create+0x6ef/0xb80 arch/x86/kvm/x86.c:9376 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3030 [inline] kvm_vm_ioctl+0x1614/0x2400 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3585 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 5563: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 tty_port_destructor drivers/tty/tty_port.c:264 [inline] kref_put include/linux/kref.h:65 [inline] tty_port_put drivers/tty/tty_port.c:272 [inline] tty_port_put+0x16a/0x1d0 drivers/tty/tty_port.c:269 dlci_put drivers/tty/n_gsm.c:1707 [inline] gsm_dlci_release drivers/tty/n_gsm.c:1735 [inline] gsm_cleanup_mux drivers/tty/n_gsm.c:2107 [inline] gsm_cleanup_mux+0x238/0x500 drivers/tty/n_gsm.c:2078 gsmld_detach_gsm drivers/tty/n_gsm.c:2419 [inline] gsmld_close+0xd1/0x1f0 drivers/tty/n_gsm.c:2487 tty_ldisc_close.isra.0+0x110/0x190 drivers/tty/tty_ldisc.c:489 tty_ldisc_kill+0x94/0x150 drivers/tty/tty_ldisc.c:637 tty_ldisc_release+0xe1/0x2a0 drivers/tty/tty_ldisc.c:809 tty_release_struct+0x16/0x50 drivers/tty/tty_io.c:1614 tty_release+0xbc7/0xe90 drivers/tty/tty_io.c:1785 __fput+0x33e/0x880 fs/file_table.c:280 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xb53/0x2e10 kernel/exit.c:795 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x47b/0x24e0 kernel/signal.c:2735 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff8880a8063000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1128 bytes inside of 2048-byte region [ffff8880a8063000, ffff8880a8063800) The buggy address belongs to the page: page:ffffea0002a018c0 refcount:1 mapcount:0 mapping:00000000aa4c320e index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002921988 ffffea0002a2c408 ffff8880aa000e00 raw: 0000000000000000 ffff8880a8063000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8063300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a8063380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a8063400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ^ ffff8880a8063480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a8063500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================