| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 124/141] KVM: x86: Cancel pvclock_gtod_work on module removal | Date | Mon, 17 May 2021 16:02:56 +0200 |
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From: Thomas Gleixner <tglx@linutronix.de>
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> --- arch/x86/kvm/x86.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7356,6 +7356,7 @@ 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();
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