Looking at the changelog for the updated kernel RPMs released today I see
35 fixes for x86 relating to placing barriers to speculative execution and
53 for Kaiser (separating kernel/user address spaces). There are no
comments for s390 specifically but a few relating to Spectre for all
arches (or those that support certain device drivers):
- [misc] locking/barriers: prevent speculative execution based on Coverity
scan results (Josh Poimboeuf) [1519788 1519786] {CVE-2017-5753}
- [fs] udf: prevent speculative execution (Josh Poimboeuf) [1519788
1519786] {CVE-2017-5753}
- [fs] prevent speculative execution (Josh Poimboeuf) [1519788 1519786]
{CVE-2017-5753}
- [kernel] userns: prevent speculative execution (Josh Poimboeuf) [1519788
1519786] {CVE-2017-5753}
- [scsi] qla2xxx: prevent speculative execution (Josh Poimboeuf) [1519788
1519786] {CVE-2017-5753}
- [netdrv] p54: prevent speculative execution (Josh Poimboeuf) [1519788
1519786] {CVE-2017-5753}
- [netdrv] carl9170: prevent speculative execution (Josh Poimboeuf)
[1519788 1519786] {CVE-2017-5753}
- [media] uvcvideo: prevent speculative execution (Josh Poimboeuf)
[1519788 1519786] {CVE-2017-5753}
I am not sure what this tells us of the vulnerability of s390 and Power to
these attacks - particularly since both have been kaiser-ized since they
were made available.
A search of ibm.com still does not reveal any official statements about
spectre or meltdown wrt s390 and Power.
Neale
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