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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-05-05 23:48:17 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-22 10:40:32 +0200 |
| commit | eeebfa16b60107c8959189738914381327715ebc (patch) | |
| tree | 3dd8b2fe9102db2ef971576ad451444ef6e31ad1 | |
| parent | c4307d4d058801352cf3fa57db097ad4106b9231 (diff) | |
| download | linux-eeebfa16b60107c8959189738914381327715ebc.tar.gz linux-eeebfa16b60107c8959189738914381327715ebc.tar.bz2 linux-eeebfa16b60107c8959189738914381327715ebc.zip | |
KVM: x86: Cancel pvclock_gtod_work on module removal
commit 594b27e677b35f9734b1969d175ebc6146741109 upstream.
Nothing prevents the following:
pvclock_gtod_notify()
queue_work(system_long_wq, &pvclock_gtod_work);
...
remove_module(kvm);
...
work_queue_run()
pvclock_gtod_work() <- UAF
Ditto for any other operation on that workqueue list head which touches
pvclock_gtod_work after module removal.
Cancel the work in kvm_arch_exit() to prevent that.
Fixes: 16e8d74d2da9 ("KVM: x86: notifier for clocksource changes")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Message-Id: <87czu4onry.ffs@nanos.tec.linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 98fb3a724037..b945f362771f 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6268,6 +6268,7 @@ void kvm_arch_exit(void) cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE); #ifdef CONFIG_X86_64 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier); + cancel_work_sync(&pvclock_gtod_work); #endif kvm_x86_ops = NULL; kvm_mmu_module_exit(); |