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Diffstat (limited to 'results/classifier/105/instruction/646')
| -rw-r--r-- | results/classifier/105/instruction/646 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/results/classifier/105/instruction/646 b/results/classifier/105/instruction/646 new file mode 100644 index 00000000..8e9c27a1 --- /dev/null +++ b/results/classifier/105/instruction/646 @@ -0,0 +1,31 @@ +instruction: 0.840 +device: 0.832 +graphic: 0.723 +network: 0.717 +socket: 0.713 +vnc: 0.701 +other: 0.618 +boot: 0.543 +semantic: 0.541 +KVM: 0.334 +assembly: 0.243 +mistranslation: 0.230 + +Infinite loop in xhci_ring_chain_length() in hw/usb/hcd-xhci.c (CVE-2020-14394) +Description of problem: +An infinite loop issue was found in the USB xHCI controller emulation of QEMU. Specifically, function `xhci_ring_chain_length()` in hw/usb/hcd-xhci.c may get stuck while fetching empty TRBs from guest memory, since the exit conditions of the loop depend on values that are fully controlled by guest. A privileged guest user may exploit this issue to hang the QEMU process on the host, resulting in a denial of service. +Steps to reproduce: +Build and load `xhci.ko` from within the guest: + +1) make +2) insmod xhci.ko + +[Makefile](/uploads/98dbf7b4facc9b100817b3c8f63b5cb2/Makefile) + +[usb-xhci.h](/uploads/f225524b1553d8cf6c1dfa89369b6edc/usb-xhci.h) + +[xhci.c](/uploads/c635f742d12a2bba6ea472ddfe006d56/xhci.c) +Additional information: +This issue was reported by Gaoning Pan (Zhejiang University) and Xingwei Li (Ant Security Light-Year Lab). + +RH bug: https://bugzilla.redhat.com/show_bug.cgi?id=1908004. |