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KVM: x86: Improve thread safety in pit
authorAndy Honig <ahonig@google.com>
Wed, 27 Aug 2014 21:42:54 +0000 (14:42 -0700)
committerJiri Slaby <jslaby@suse.cz>
Thu, 13 Nov 2014 18:02:27 +0000 (19:02 +0100)
commit5671c6a9229edd1b1587b4ea1014d540a7e74797
tree637662426acad47f2416f2317de2405db36e67b5tree
parent9f9a1ce3932ca0b1bd52932d70929eab6e574d97commit | diff
KVM: x86: Improve thread safety in pit

commit 2febc839133280d5a5e8e1179c94ea674489dae2 upstream.

There's a race condition in the PIT emulation code in KVM.  In
__kvm_migrate_pit_timer the pit_timer object is accessed without
synchronization.  If the race condition occurs at the wrong time this
can crash the host kernel.

This fixes CVE-2014-3611.

Signed-off-by: Andrew Honig <ahonig@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
arch/x86/kvm/i8254.c diff | blob | blame | history
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git