[LU-10455] kernel update [RHEL7.4 3.10.0-693.11.6.el7]

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.11.0, Lustre 2.10.3
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

Security Fix(es):

An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimization). There are three primary variants of the issue which differ in the way the speculative execution can be exploited.

Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty. Please refer to References section for further information about this issue and the performance impact.

Variant CVE-2017-5753 triggers the speculative execution by performing a bounds-check bypass. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to cross the syscall boundary and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5753, Important)

Variant CVE-2017-5715 triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5715, Important)

Variant CVE-2017-5754 relies on the fact that, on impacted microprocessors, during speculative execution of instruction permission faults, exception generation triggered by a faulting access is suppressed until the retirement of the whole instruction block. In a combination with the fact that memory accesses may populate the cache even when the block is being dropped and never committed (executed), an unprivileged local attacker could use this flaw to read privileged (kernel space) memory by conducting targeted cache side-channel attacks. (CVE-2017-5754, Important)

Note: CVE-2017-5754 affects Intel x86-64 microprocessors. AMD x86-64 microprocessors are not affected by this issue.

References

https://access.redhat.com/security/vulnerabilities/speculativeexecution
https://access.redhat.com/security/cve/CVE-2017-5753
https://access.redhat.com/security/cve/CVE-2017-5715
https://access.redhat.com/security/cve/CVE-2017-5754

Issue Links

• is related to: LU-10563 kernel update [RHEL7.4 3.10.0-693.17.1.el7]
• is related to: LU-10301 kernel update [RHEL7.4 3.10.0-693.11.1.el7]

Comments

[Peter Jones]

Landed for 2.11

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/30734/
Subject: LU-10455 kernel: kernel update RHEL7.4 [3.10.0-693.11.6.el7]
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: ac24d42d44e651a5e1cea7c9477ace2b1eba198a

[Trent Geerdes (Inactive)]

Is there a timeline when this would be included in a release version?

[Gerrit Updater]

James Nunez ([e-mail]) uploaded a new patch: https://review.whamcloud.com/30783
Subject: LU-10455 kernel: Test Only Revert kernel update RHEL7.4
Project: fs/lustre-release
Branch: b2_10
Current Patch Set: 1
Commit: bfaa1f572b05aa5a0721d92b714cbc3c77ec4ab4

[Gerrit Updater]

John L. Hammond ([e-mail]) merged in patch https://review.whamcloud.com/30735/
Subject: LU-10455 kernel: kernel update RHEL7.4 [3.10.0-693.11.6.el7]
Project: fs/lustre-release
Branch: b2_10
Current Patch Set:
Commit: 812416bfdeca0b50ba9e251c40a2188ff31345bd

[Gerrit Updater]

Bob Glossman ([e-mail]) uploaded a new patch: https://review.whamcloud.com/30735
Subject: LU-10455 kernel: kernel update RHEL7.4 [3.10.0-693.11.6.el7]
Project: fs/lustre-release
Branch: b2_10
Current Patch Set: 1
Commit: 10eae1d28d852fa3505df2e39b4c3c9ea6e73ec6

[Gerrit Updater]

Bob Glossman ([e-mail]) uploaded a new patch: https://review.whamcloud.com/30734
Subject: LU-10455 kernel: kernel update RHEL7.4 [3.10.0-693.11.6.el7]
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 331ce26d45fa1e3671a23912ba5cf64089ebc7cb