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  1. Bug #1790457
  2. Comment #5

Comment 5 for bug 1790457

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2018-09-04 06:28 EDT-------
The extra patch is a follow-up for de5cb6eb51 ("s390: use expoline thunks in
the BPF JIT"), but the extra patch can not go upstream as the code it patches
is not present anymore. See git commit e1cf4befa2 ("bpf, s390x: remove
ld_abs/ld_ind").

The patch 26f8438 ("s390: fix br_r1_trampoline for machines without exrl")
has just been picked up by Greg for stable-4.4, see [PATCH 4.4 71/80] in
his latest patch series. This patch is only required when building for
machines prio to z10.

All of these patches are related to the original spectre-v2 CVE-2017-5715,
CVE-2018-3639 is speculative store bypass aka spectre variant 4, no ?