linux-kernel - [syzbot] KMSAN: uninit-value in kvm_irq_delivery_to_apic

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Date:   Tue, 28 Jun 2022 04:37:24 -0700
From:   syzbot <syzbot+d6caa905917d353f0d07@...kaller.appspotmail.com>
To:     bp@...en8.de, dave.hansen@...ux.intel.com, glider@...gle.com,
        hpa@...or.com, jmattson@...gle.com, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, pbonzini@...hat.com, seanjc@...gle.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vkuznets@...hat.com, wanpengli@...cent.com, x86@...nel.org
Subject: [syzbot] KMSAN: uninit-value in kvm_irq_delivery_to_apic_fast

Hello,

syzbot found the following issue on:

HEAD commit:    4b28366af7d9 x86: kmsan: enable KMSAN builds for x86
git tree:       https://github.com/google/kmsan.git master
console+strace: https://syzkaller.appspot.com/x/log.txt?x=126a4b60080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d14e10a167d1c585
dashboard link: https://syzkaller.appspot.com/bug?extid=d6caa905917d353f0d07
compiler:       clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14d596c4080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10bcf08ff00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d6caa905917d353f0d07@...kaller.appspotmail.com

L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
=====================================================
BUG: KMSAN: uninit-value in kvm_apic_set_irq arch/x86/kvm/lapic.c:634 [inline]
BUG: KMSAN: uninit-value in kvm_irq_delivery_to_apic_fast+0x7a7/0x990 arch/x86/kvm/lapic.c:1044
 kvm_apic_set_irq arch/x86/kvm/lapic.c:634 [inline]
 kvm_irq_delivery_to_apic_fast+0x7a7/0x990 arch/x86/kvm/lapic.c:1044
 kvm_irq_delivery_to_apic+0xdb/0xe40 arch/x86/kvm/irq_comm.c:54
 kvm_pv_kick_cpu_op+0xd1/0x100 arch/x86/kvm/x86.c:9155
 kvm_emulate_hypercall+0xee7/0x1340 arch/x86/kvm/x86.c:9285
 __vmx_handle_exit+0x101f/0x1710 arch/x86/kvm/vmx/vmx.c:6237
 vmx_handle_exit+0x38/0x1f0 arch/x86/kvm/vmx/vmx.c:6254
 vcpu_enter_guest+0x4733/0x52d0 arch/x86/kvm/x86.c:10366
 vcpu_run+0x794/0x1230 arch/x86/kvm/x86.c:10455
 kvm_arch_vcpu_ioctl_run+0x11fe/0x1b30 arch/x86/kvm/x86.c:10659
 kvm_vcpu_ioctl+0xcd4/0x1980 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3948
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856
 __x64_sys_ioctl+0x92/0xd0 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Local variable lapic_irq created at:
 kvm_pv_kick_cpu_op+0x46/0x100 arch/x86/kvm/x86.c:9146
 kvm_emulate_hypercall+0xee7/0x1340 arch/x86/kvm/x86.c:9285

CPU: 1 PID: 3490 Comm: syz-executor407 Not tainted 5.19.0-rc3-syzkaller-30868-g4b28366af7d9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================

---
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