From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B8BE42638AF for ; Tue, 9 Sep 2025 21:52:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757454725; cv=none; b=SMsAy+bCRgP0CjhZ0IZM8GZ8VWXt3KuTSrb0MIg5H2ErG9TU+SVboEWRD1jHdSMNW3j8sxvWprxHHcmwa/iNqxoWiTwfiLVKguRWNwTH2IYJHe+n7Y/SAksCaXhccXHA40/ztQh70F/A3CBQONNYIVbf0VaQGhiH3vHu8ZKFtmU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757454725; c=relaxed/simple; bh=VRKGqPYdPm2RiNkLDyzrA8n4qc370r0yadDPgwWixCs=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2198:b0:405:b792:32f0 with SMTP id e9e14a558f8ab-405b79234cemr140795505ab.32.1757454722899; Tue, 09 Sep 2025 14:52:02 -0700 (PDT) Date: Tue, 09 Sep 2025 14:52:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68c0a182.050a0220.2ff435.0005.GAE@google.com> Subject: Re: [syzbot] [kvmarm?] KASAN: invalid-access Read in __kvm_pgtable_walk From: syzbot To: catalin.marinas@arm.com, joey.gouly@arm.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, suzuki.poulose@arm.com, syzkaller-bugs@googlegroups.com, will@kernel.org, yuzenghui@huawei.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: invalid-access Read in __kvm_pgtable_walk ================================================================== 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 f0f0000007d02000 by task syz.2.17/4041 Pointer tag: [f0], memory tag: [fe] CPU: 1 UID: 0 PID: 4041 Comm: syz.2.17 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:1584 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+0x5c/0xc0 arch/arm64/kvm/mmu.c:1116 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_vm_release+0x80/0xb0 virt/kvm/kvm_main.c:1367 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x13c/0x16c arch/arm64/kernel/entry-common.c:155 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:0xfaf0000007d026c0 pfn:0x47d02 flags: 0x1fffc0000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0xf) raw: 01fffc0000000000 ffffc1ffc0375788 ffffc1ffc0374788 0000000000000000 raw: faf0000007d026c0 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff0000007d01e00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 fa fa fff0000007d01f00: fa fa fa fa fa fc fc fc fc fc fc fc fe fe fe fe >fff0000007d02000: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ fff0000007d02100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fff0000007d02200: 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 fff6011cc11c0000 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 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 [fff6011cc11c0000] pgd=0000000000000000 Internal error: Oops: 000000009600002b [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 4041 Comm: syz.2.17 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: linux,dummy-virt (DT) pstate: 21402009 (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 : ffff8000897ab910 x29: ffff8000897ab910 x28: f9f0000012c1dc80 x27: 0000000000000000 x26: 0000000000000003 x25: 0000000000000004 x24: fffffffffffff000 x23: 0000000000001000 x22: ffff80008292e9c8 x21: fff6011cc11c1000 x20: ffff8000897abbd8 x19: fff6011cc11c0000 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: ffff800081b63cd0 x14: fbf0000003145d00 x13: 0000000000000001 x12: 0000000000000001 x11: 00000042f216d964 x10: fbf0000003145d00 x9 : 0000000000000005 x8 : 0000000000000070 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000004e80000000 x4 : fff6011cc11c0008 x3 : 0000004ec0000000 x2 : ffff8000897abc10 x1 : 0000004e80800000 x0 : 000000000000000c 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_visit arch/arm64/kvm/hyp/pgtable.c:207 [inline] __kvm_pgtable_walk+0xb4/0x2d0 arch/arm64/kvm/hyp/pgtable.c:237 __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:1584 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+0x5c/0xc0 arch/arm64/kvm/mmu.c:1116 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_vm_release+0x80/0xb0 virt/kvm/kvm_main.c:1367 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x13c/0x16c arch/arm64/kernel/entry-common.c:155 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 Tested on: commit: 2d047827 KVM: arm64: vgic: fix incorrect spinlock API .. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git fixes console output: https://syzkaller.appspot.com/x/log.txt?x=12a4b562580000 kernel config: https://syzkaller.appspot.com/x/.config?x=58f92aa8be80d71 dashboard link: https://syzkaller.appspot.com/bug?extid=31156cb24a340d8e2c05 compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Note: no patches were applied.