From: syzbot <syzbot+d6d011bc17bb751d4aa2@syzkaller.appspotmail.com>
To: bp@alien8.de, dave.hansen@linux.intel.com, glider@google.com,
hpa@zytor.com, jarkko@kernel.org, jmattson@google.com,
joro@8bytes.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org,
mingo@redhat.com, pbonzini@redhat.com, seanjc@google.com,
syzkaller-bugs@googlegroups.com, tglx@linutronix.de,
vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org
Subject: [syzbot] KMSAN: uninit-value in kvm_cpuid
Date: Thu, 30 Sep 2021 23:47:19 -0700 [thread overview]
Message-ID: <00000000000048342f05cd44efc0@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: cd2c05533838 DO-NOT-SUBMIT: kmsan: suppress a report in ke..
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=11373b17300000
kernel config: https://syzkaller.appspot.com/x/.config?x=978f1b2d7a5aad3e
dashboard link: https://syzkaller.appspot.com/bug?extid=d6d011bc17bb751d4aa2
compiler: clang version 14.0.0 (git@github.com:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b6c4cb300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fdb00f300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d6d011bc17bb751d4aa2@syzkaller.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 cpuid_entry2_find arch/x86/kvm/cpuid.c:68 [inline]
BUG: KMSAN: uninit-value in kvm_find_cpuid_entry arch/x86/kvm/cpuid.c:1103 [inline]
BUG: KMSAN: uninit-value in kvm_cpuid+0x456/0x28f0 arch/x86/kvm/cpuid.c:1183
cpuid_entry2_find arch/x86/kvm/cpuid.c:68 [inline]
kvm_find_cpuid_entry arch/x86/kvm/cpuid.c:1103 [inline]
kvm_cpuid+0x456/0x28f0 arch/x86/kvm/cpuid.c:1183
kvm_vcpu_reset+0x13fb/0x1c20 arch/x86/kvm/x86.c:10885
kvm_apic_accept_events+0x58f/0x8c0 arch/x86/kvm/lapic.c:2923
vcpu_enter_guest+0xfd2/0x6d80 arch/x86/kvm/x86.c:9534
vcpu_run+0x7f5/0x18d0 arch/x86/kvm/x86.c:9788
kvm_arch_vcpu_ioctl_run+0x245b/0x2d10 arch/x86/kvm/x86.c:10020
kvm_vcpu_ioctl+0x1055/0x1e00 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3749
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0x2df/0x4a0 fs/ioctl.c:860
__x64_sys_ioctl+0xd8/0x110 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x44/0xae
Local variable ----dummy@kvm_vcpu_reset created at:
kvm_vcpu_reset+0x1fb/0x1c20 arch/x86/kvm/x86.c:10812
kvm_apic_accept_events+0x58f/0x8c0 arch/x86/kvm/lapic.c:2923
=====================================================
Kernel panic - not syncing: panic_on_kmsan set ...
CPU: 1 PID: 6364 Comm: syz-executor072 Tainted: G B 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106
dump_stack+0x25/0x28 lib/dump_stack.c:113
panic+0x44f/0xdeb kernel/panic.c:232
kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186
__msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208
cpuid_entry2_find arch/x86/kvm/cpuid.c:68 [inline]
kvm_find_cpuid_entry arch/x86/kvm/cpuid.c:1103 [inline]
kvm_cpuid+0x456/0x28f0 arch/x86/kvm/cpuid.c:1183
kvm_vcpu_reset+0x13fb/0x1c20 arch/x86/kvm/x86.c:10885
kvm_apic_accept_events+0x58f/0x8c0 arch/x86/kvm/lapic.c:2923
vcpu_enter_guest+0xfd2/0x6d80 arch/x86/kvm/x86.c:9534
vcpu_run+0x7f5/0x18d0 arch/x86/kvm/x86.c:9788
kvm_arch_vcpu_ioctl_run+0x245b/0x2d10 arch/x86/kvm/x86.c:10020
kvm_vcpu_ioctl+0x1055/0x1e00 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3749
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0x2df/0x4a0 fs/ioctl.c:860
__x64_sys_ioctl+0xd8/0x110 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f51eb544a19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe2fe74dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f51eb544a19
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe2fe74f68
R10: 0000000000009120 R11: 0000000000000246 R12: 00007f51eb507c80
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
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syzbot can test patches for this issue, for details see:
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next reply other threads:[~2021-10-01 6:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 6:47 syzbot [this message]
2021-10-01 15:13 ` [syzbot] KMSAN: uninit-value in kvm_cpuid Sean Christopherson
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