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From 41d2d56a0fda46b582eab0845f064ba85c9c2456 Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Mon, 1 Sep 2014 13:36:52 +0200
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Subject: [PATCH 1/6] vmstate_xhci_event: fix unterminated field list
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Message-id: <1409578613-11909-2-git-send-email-lersek@redhat.com>
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Patchwork-id: 60781
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O-Subject: [PATCH RHEL-7.0.z/RHEL-7.1.0 qemu-kvm 1/2] vmstate_xhci_event: fix unterminated field list
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Bugzilla: 1145055
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RH-Acked-by: Amit Shah <amit.shah@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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"vmstate_xhci_event" was introduced in commit 37352df3 ("xhci: add live
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migration support"), and first released in v1.6.0. The field list in this
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VMSD is not terminated with the VMSTATE_END_OF_LIST() macro.
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During normal use (ie. migration), the issue is practically invisible,
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because the "vmstate_xhci_event" object (with the unterminated field list)
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is only ever referenced -- via "vmstate_xhci_intr" -- if xhci_er_full()
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returns true, for the "ev_buffer" test. Since that field_exists() check
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(apparently) almost always returns false, we almost never traverse
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"vmstate_xhci_event" during migration, which hides the bug.
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However, Amit's vmstate checker forces recursion into this VMSD as well,
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and the lack of VMSTATE_END_OF_LIST() breaks the field list terminator
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check (field->name != NULL) in dump_vmstate_vmsd(). The result is
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undefined behavior, which in my case translates to infinite recursion
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(because the loop happens to overflow into "vmstate_xhci_intr", which then
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links back to "vmstate_xhci_event").
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Add the missing terminator.
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Reviewed-by: Amit Shah <amit.shah@redhat.com>
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Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from commit 3afca1d6d413592c2b78cf28f52fa24a586d8f56)
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RHEL-7 note: this is for CVE-2014-5263.
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/hcd-xhci.c | 1 +
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1 files changed, 1 insertions(+), 0 deletions(-)
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diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
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index 87ba7af..dbdf6b1 100644
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--- a/hw/usb/hcd-xhci.c
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+++ b/hw/usb/hcd-xhci.c
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@@ -3526,6 +3526,7 @@ static const VMStateDescription vmstate_xhci_event = {
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VMSTATE_UINT32(flags, XHCIEvent),
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VMSTATE_UINT8(slotid, XHCIEvent),
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VMSTATE_UINT8(epid, XHCIEvent),
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+ VMSTATE_END_OF_LIST()
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}
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};
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--
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1.7.1
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