================================================================== BUG: KASAN: invalid-access in __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:161 [inline] BUG: KASAN: invalid-access in __kvm_pgtable_walk+0x110/0x2d0 arch/arm64/kvm/hyp/pgtable.c:237 Read at addr faf000000b04f000 by task syz.1.6/3473 Pointer tag: [fa], memory tag: [fe] CPU: 0 UID: 0 PID: 3473 Comm: syz.1.6 Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x108/0x61c mm/kasan/report.c:482 kasan_report+0x88/0xac mm/kasan/report.c:595 report_tag_fault arch/arm64/mm/fault.c:326 [inline] do_tag_recovery arch/arm64/mm/fault.c:338 [inline] __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:380 do_bad_area+0x68/0x78 arch/arm64/mm/fault.c:480 do_tag_check_fault+0x34/0x44 arch/arm64/mm/fault.c:853 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:929 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:481 el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:597 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:591 __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:161 [inline] (P) __kvm_pgtable_walk+0x110/0x2d0 arch/arm64/kvm/hyp/pgtable.c:237 (P) _kvm_pgtable_walk arch/arm64/kvm/hyp/pgtable.c:260 [inline] kvm_pgtable_walk+0xd0/0x164 arch/arm64/kvm/hyp/pgtable.c:283 kvm_pgtable_stage2_destroy_range+0x3c/0x70 arch/arm64/kvm/hyp/pgtable.c:1563 stage2_destroy_range arch/arm64/kvm/mmu.c:924 [inline] kvm_stage2_destroy+0x74/0xd0 arch/arm64/kvm/mmu.c:935 kvm_free_stage2_pgd+0x4c/0x84 arch/arm64/kvm/mmu.c:1112 kvm_uninit_stage2_mmu+0x1c/0x34 arch/arm64/kvm/mmu.c:1023 kvm_arch_flush_shadow_all+0x6c/0x84 arch/arm64/kvm/nested.c:1113 kvm_flush_shadow_all virt/kvm/kvm_main.c:343 [inline] kvm_mmu_notifier_release+0x30/0x84 virt/kvm/kvm_main.c:884 mmu_notifier_unregister+0x5c/0x11c mm/mmu_notifier.c:815 kvm_destroy_vm+0x148/0x2b0 virt/kvm/kvm_main.c:1287 kvm_put_kvm virt/kvm/kvm_main.c:1344 [inline] kvm_vcpu_release+0x70/0x9c virt/kvm/kvm_main.c:4091 __fput+0xcc/0x2dc fs/file_table.c:468 ____fput+0x14/0x20 fs/file_table.c:496 task_work_run+0x78/0xd4 kernel/task_work.c:227 get_signal+0xc8/0x848 kernel/signal.c:2807 do_signal+0xf0/0x3ec arch/arm64/kernel/signal.c:1618 do_notify_resume+0xe0/0x16c arch/arm64/kernel/entry-common.c:152 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0x108/0x10c arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4b04f flags: 0x1ffd40000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x5) raw: 01ffd40000000000 ffffc1ffc0224708 ffffc1ffc02c2b88 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff000000b04ee00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fff000000b04ef00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >fff000000b04f000: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ fff000000b04f100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fff000000b04f200: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ================================================================== Unable to handle kernel paging request at virtual address fff401fdc0000000 Mem abort info: ESR = 0x000000009600002b EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x2b: level -1 translation fault Data abo Data abort info: ISV = 0, ISS = 0x0000002b, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 52-bit VAs, pgdp=0000000042978000 [fff401fdc0000000] pgd=0000000000000000 Internal error: Oops: 000000009600002b [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 3473 Comm: syz.1.6 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: linux,dummy-virt (DT) pstate: 20402009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:163 [inline] pc : __kvm_pgtable_walk+0x110/0x2d0 arch/arm64/kvm/hyp/pgtable.c:237 lr : __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:207 [inline] lr : __kvm_pgtable_walk+0xb4/0x2d0 arch/arm64/kvm/hyp/pgtable.c:237 sp : ffff8000892cb940 x29: ffff8000892cb940 x28: f9f000000a763780 x27: 0000000000000000 x26: 0000000000000001 x25: 0000000000000002 x24: ffffffffc0000000 x23: 0000000040000000 x22: ffff80008292e9c8 x21: fff401fdc0001000 x20: ffff8000892cbac8 x19: fff401fdc0000000 x18: 0000000000000000 x17: fff07ffffcfe1000 x16: ffff800080000000 x15: 0000aaaac6e9e750 x14: 0000000000000361 x13: 0000000000000000 x12: 0000000000000006 x11: 00000000000000c0 x10: 49535a030b45c645 x9 : 0000000000000005 x8 : 0000000000000080 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000008000000000 x4 : fff401fdc0000008 x3 : 0000008040000000 x2 : ffff8000892cbb00 x1 : 0000008000000000 x0 : 000000000000001e Call trace: __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:161 [inline] (P) __kvm_pgtable_walk+0x110/0x2d0 arch/arm64/kvm/hyp/pgtable.c:237 (P) __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:207 [inline] __kvm_pgtable_walk+0xb4/0x2d0 arch/arm64/kvm/hyp/pgtable.c:237 _kvm_pgtable_walk arch/arm64/kvm/hyp/pgtable.c:260 [inline] kvm_pgtable_walk+0xd0/0x164 arch/arm64/kvm/hyp/pgtable.c:283 kvm_pgtable_stage2_destroy_range+0x3c/0x70 arch/arm64/kvm/hyp/pgtable.c:1563 stage2_destroy_range arch/arm64/kvm/mmu.c:924 [inline] kvm_stage2_destroy+0x74/0xd0 arch/arm64/kvm/mmu.c:935 kvm_free_stage2_pgd+0x4c/0x84 arch/arm64/kvm/mmu.c:1112 kvm_uninit_stage2_mmu+0x1c/0x34 arch/arm64/kvm/mmu.c:1023 kvm_arch_flush_shadow_all+0x6c/0x84 arch/arm64/kvm/nested.c:1113 kvm_flush_shadow_all virt/kvm/kvm_main.c:343 [inline] kvm_mmu_notifier_release+0x30/0x84 virt/kvm/kvm_main.c:884 mmu_notifier_unregister+0x5c/0x11c mm/mmu_notifier.c:815 kvm_destroy_vm+0x148/0x2b0 virt/kvm/kvm_main.c:1287 kvm_put_kvm virt/kvm/kvm_main.c:1344 [inline] kvm_vcpu_release+0x70/0x9c virt/kvm/kvm_main.c:4091 __fput+0xcc/0x2dc fs/file_table.c:468 ____fput+0x14/0x20 fs/file_table.c:496 task_work_run+0x78/0xd4 kernel/task_work.c:227 get_signal+0xc8/0x848 kernel/signal.c:2807 do_signal+0xf0/0x3ec arch/arm64/kernel/signal.c:1618 do_notify_resume+0xe0/0x16c arch/arm64/kernel/entry-common.c:152 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0x108/0x10c arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596 Code: f9400e83 eb01007f 54000789 a9401682 (f9400260) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f9400e83 ldr x3, [x20, #24] 4: eb01007f cmp x3, x1 8: 54000789 b.ls 0xf8 // b.plast c: a9401682 ldp x2, x5, [x20] * 10: f9400260 ldr x0, [x19] <-- trapping instruction