CVS commit: src/sys/arch

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Tue May  8 17:20:44 UTC 2018

Modified Files:
        src/sys/arch/amd64/amd64: amd64_trap.S machdep.c
        src/sys/arch/x86/include: pmap.h

Log Message:
Mitigation for the SS bug, CVE-2018-8897. We disabled dbregs a month ago
in -current and -8 so we are not particularly affected anymore.

The #DB handler runs on ist3, if we decide to process the exception we
copy the iret frame on the correct non-ist stack and continue as usual.


To generate a diff of this commit:
cvs rdiff -u -r1.40 -r1.41 src/sys/arch/amd64/amd64/amd64_trap.S
cvs rdiff -u -r1.303 -r1.304 src/sys/arch/amd64/amd64/machdep.c
cvs rdiff -u -r1.76 -r1.77 src/sys/arch/x86/include/pmap.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.