Description
In the Linux kernel, the following vulnerability has been resolved: s390/entry: Scrub r12 register on kernel entry Before commit f33f2d4c7c80 ("s390/bp: remove TIF_ISOLATE_BP"), all entry handlers loaded r12 with the current task pointer (lg %r12,__LC_CURRENT) for use by the BPENTER/BPEXIT macros. That commit removed TIF_ISOLATE_BP, dropping both the branch prediction macros and the r12 load, but did not add r12 to the register clearing sequence. Add the missing xgr %r12,%r12 to make the register scrub consistent across all entry points.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 to < a58d298a83a3a9b7ca99ded9d60a1e77231159efaffectedf33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 to < 95c899cd791803a5bf7b73e5994fbbe1cc1a9c36affectedf33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 to < 7f4e3233faa8470dd0627bc49b2809f2bfebd909affectedf33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 to < 99a8b420f3f0e162eb9c9c9253929d4d23f9bd30affectedf33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 to < 0738d395aab8fae3b5a3ad3fc640630c91693c27affected
Linux Linux
Default version status: affected
6.4affected0 to < 6.4unaffected6.6.131 to ≤ 6.6.*unaffected6.12.80 to ≤ 6.12.*unaffected6.18.21 to ≤ 6.18.*unaffected6.19.11 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef ↗
- https://git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36 ↗
- https://git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909 ↗
- https://git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30 ↗
- https://git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27 ↗