Security update for xen

This update for xen fixes several issues.

These security issues were fixed:

- CVE-2017-10912: Page transfer might have allowed PV guest to elevate privilege (XSA-217, bsc#1042882)
- CVE-2017-10913 CVE-2017-10914: Races in the grant table unmap code allowed for informations leaks and potentially privilege escalation (XSA-218, bsc#1042893)
- CVE-2017-10915: Insufficient reference counts during shadow emulation allowed a malicious pair of guest to elevate their privileges to the privileges that XEN runs under (XSA-219, bsc#1042915)
- CVE-2017-10917: Missing NULL pointer check in event channel poll allows guests to DoS the host (XSA-221, bsc#1042924)
- CVE-2017-10918: Stale P2M mappings due to insufficient error checking allowed malicious guest to leak information or elevate privileges (XSA-222, bsc#1042931)
- CVE-2017-10920, CVE-2017-10921, CVE-2017-10922: Grant table operations mishandled reference counts allowing malicious guests to escape (XSA-224, bsc#1042938)
- CVE-2017-9330: USB OHCI Emulation in qemu allowed local guest OS users to cause a denial of service (infinite loop) by leveraging an incorrect return value (bsc#1042160)
- CVE-2017-8309: Memory leak in the audio/audio.c allowed remote attackers to cause a denial of service (memory consumption) by repeatedly starting and stopping audio capture (bsc#1037243)
- PKRU and BND* leakage between vCPU-s might have leaked information to other guests (XSA-220, bsc#1042923)

These non-security issues were fixed:

- bsc#1027519: Included various upstream patches
- bsc#1035642: Ensure that rpmbuild works

This update was imported from the SUSE:SLE-12-SP2:Update update project.

Fixed bugs
bnc#1042893
VUL-0: xen: Races in the grant table unmap code (XSA-218)
bnc#1042882
VUL-0: xen: page transfer may allow PV guest to elevate privilege (XSA-217)
bnc#1042924
VUL-0: xen: NULL pointer deref in event channel poll (XSA-221)
bnc#1042923
VUL-0: xen: x86: PKRU and BND* leakage between vCPU-s (XSA-220)
bnc#1042931
VUL-0: xen: stale P2M mappings due to insufficient error checking (XSA-222)
bnc#1037243
VUL-1: CVE-2017-8309: xen: audio: host memory leakage via capture buffer
bnc#1042915
VUL-0: xen: x86: insufficient reference counts during shadow emulation (XSA-219)
bnc#1042938
VUL-0: xen: grant table operations mishandle reference counts (XSA-224)
bnc#1027519
Xen: Missing upstream bug fixes
bnc#1042160
VUL-1: CVE-2017-9330: xen: usb: ohci: infinite loop due to incorrect return value
bnc#1035642
rpmbuild -bc with xen-4.7.0_12-23.4.src.rpm failed
Selected Binaries
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