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Peter Zijlstra e9925a4584 x86: Add straight-line-speculation mitigation 
commit e463a09af2 upstream.

Make use of an upcoming GCC feature to mitigate
straight-line-speculation for x86:

  https://gcc.gnu.org/g:53a643f8568067d7700a9f2facc8ba39974973d3
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102952
  https://bugs.llvm.org/show_bug.cgi?id=52323

It's built tested on x86_64-allyesconfig using GCC-12 and GCC-11.

Maintenance overhead of this should be fairly low due to objtool
validation.

Size overhead of all these additional int3 instructions comes to:

     text	   data	    bss	    dec	    hex	filename
  22267751	6933356	2011368	31212475	1dc43bb	defconfig-build/vmlinux
  22804126	6933356	1470696	31208178	1dc32f2	defconfig-build/vmlinux.sls

Or roughly 2.4% additional text.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211204134908.140103474@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 5.10:
 - In scripts/Makefile.build, add the objtool option with an ifdef
   block, same as for other options
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-07-25 11:26:30 +02:00
..
atomic
Merge branch 'kcsan' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into locking/core
2020-10-09 08:56:02 +02:00
basic
kbuild: introduce hostprogs-always-y and userprogs-always-y
2020-08-10 01:32:59 +09:00
clang-tools
gen_compile_commands: fix missing 'sys' package
2021-09-22 12:27:58 +02:00
coccinelle
Merge branch 'for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux
2020-10-18 14:20:35 -07:00
dtc
scripts/dtc: Call pkg-config POSIXly correct
2022-04-08 14:40:15 +02:00
dummy-tools
kbuild: simplify GCC_PLUGINS enablement in dummy-tools/gcc
2021-12-14 11:32:46 +01:00
gcc-plugins
gcc-plugins: latent_entropy: use /dev/urandom
2022-04-20 09:23:26 +02:00
gdb
scripts/gdb: change kernel config dumping method
2022-06-14 18:32:45 +02:00
genksyms
genksyms: keywords: Use __restrict not _restrict
2020-08-18 20:16:46 +09:00
kconfig
kconfig: fix failing to generate auto.conf
2022-02-23 12:01:07 +01:00
ksymoops
…
mod
modpost: fix section mismatch check for exported init/exit sections
2022-06-29 08:59:54 +02:00
package
builddeb: Fix rootless build in setuid/setgid directory
2020-11-02 11:31:00 +09:00
selinux
scripts/selinux,selinux: update mdp to enable policy capabilities
2020-08-17 20:42:00 -04:00
tracing
scripts/tracing: fix the bug that can't parse raw_trace_func
2021-08-12 13:22:12 +02:00
.gitignore
kbuild: preprocess module linker script
2020-09-25 00:36:41 +09:00
adjust_autoksyms.sh
kbuild: split adjust_autoksyms.sh in two parts
2020-03-03 20:49:21 +09:00
asn1_compiler.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
bin2c.c
…
bloat-o-meter
scripts: switch explicitly to Python 3
2021-05-22 11:40:55 +02:00
bootgraph.pl
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 391
2019-06-05 17:37:11 +02:00
bpf_helpers_doc.py
bpf: Add struct bpf_redir_neigh forward declaration to BPF helper defs
2020-10-29 15:19:04 +01:00
cc-can-link.sh
…
check_extable.sh
…
check-sysctl-docs
docs: add a script to check sysctl docs
2020-02-25 03:35:16 -07:00
checkincludes.pl
…
checkkconfigsymbols.py
kconfig: remove '---help---' support
2020-08-14 13:30:03 +09:00
checkpatch.pl
checkpatch: fix unescaped left brace
2020-12-30 11:53:56 +01:00
checkstack.pl
scripts/checkstack.pl: fix arm sp regex
2020-05-26 00:03:16 +09:00
checksyscalls.sh
…
checkversion.pl
…
clang-version.sh
…
cleanfile
…
cleanpatch
…
coccicheck
scripts: coccicheck: Change default condition for parallelism
2020-10-12 10:37:56 +02:00
config
tweewide: Fix most Shebang lines
2021-05-22 11:40:55 +02:00
const_structs.checkpatch
const_structs.checkpatch: add pinctrl_ops and pinmux_ops
2020-10-16 11:11:21 -07:00
decode_stacktrace.sh
scripts/decode_stacktrace.sh: guess path to vmlinux by release name
2020-08-07 11:33:21 -07:00
decodecode
scripts/decodecode: add the capability to supply the program counter
2020-10-13 18:38:26 -07:00
depmod.sh
depmod: handle the case of /sbin/depmod without /sbin in PATH
2021-01-12 20:18:16 +01:00
dev-needs.sh
scripts/dev-needs: Add script to list device dependencies
2020-09-04 18:19:37 +02:00
diffconfig
scripts: switch explicitly to Python 3
2021-05-22 11:40:55 +02:00
documentation-file-ref-check
scripts: documentation-file-ref-check: Add line break before exit
2020-04-15 15:13:13 -06:00
export_report.pl
modpost: move the namespace field in Module.symvers last
2020-03-17 08:59:03 +09:00
extract_xc3028.pl
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 339
2019-06-05 17:37:07 +02:00
extract-cert.c
extract-cert: add static to local data
2020-08-18 20:16:46 +09:00
extract-ikconfig
…
extract-module-sig.pl
…
extract-sys-certs.pl
…
extract-vmlinux
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 378
2019-06-05 17:37:10 +02:00
faddr2line
faddr2line: Fix overlapping text section failures, the sequel
2022-06-22 14:13:17 +02:00
file-size.sh
…
find-unused-docs.sh
scripts/find-unused-docs: Fix massive false positives
2020-01-27 14:25:06 -07:00
gcc-goto.sh
…
gcc-ld
…
gcc-version.sh
…
gcc-x86_32-has-stack-protector.sh
…
gcc-x86_64-has-stack-protector.sh
…
gen_autoksyms.sh
kbuild: fix CONFIG_TRIM_UNUSED_KSYMS build for ppc64
2021-02-26 10:13:01 +01:00
gen_ksymdeps.sh
kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y
2021-09-18 13:40:16 +02:00
get_abi.pl
tweewide: Fix most Shebang lines
2021-05-22 11:40:55 +02:00
get_dvb_firmware
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61
2019-05-24 17:36:45 +02:00
get_maintainer.pl
get_maintainer: exclude MAINTAINERS file(s) from --git-fallback
2020-10-16 11:11:19 -07:00
gfp-translate
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166
2019-05-30 11:26:39 -07:00
headerdep.pl
…
headers_check.pl
…
headers_install.sh
Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 13:29:39 -07:00
insert-sys-cert.c
…
jobserver-exec
docs, parallelism: Rearrange how jobserver reservations are made
2019-11-22 10:35:18 -07:00
kallsyms.c
kallsyms: fix nonconverging kallsyms table with lld
2021-02-17 11:02:24 +01:00
Kbuild.include
kbuild: sink stdout from cmd for silent build
2021-07-25 14:36:12 +02:00
Kconfig.include
kconfig: unify cc-option and as-option
2020-06-17 10:38:42 +09:00
kernel-doc
scripts: kernel-doc: fix parsing function-like typedefs
2020-12-30 11:53:33 +01:00
ld-version.sh
…
leaking_addresses.pl
leaking_addresses: Always print a trailing newline
2021-11-18 14:03:57 +01:00
Lindent
…
link-vmlinux.sh
x86: Add straight-line-speculation mitigation
2022-07-25 11:26:30 +02:00
lld-version.sh
scripts/lld-version.sh: Rewrite based on upstream ld-version.sh
2021-11-21 13:46:37 +01:00
Makefile
certs: Add ability to preload revocation certs
2021-06-30 08:47:30 -04:00
Makefile.asm-generic
kbuild: force all architectures except um to include mandatory-y
2019-03-17 12:56:32 +09:00
Makefile.build
x86: Add straight-line-speculation mitigation
2022-07-25 11:26:30 +02:00
Makefile.clean
kbuild: introduce hostprogs-always-y and userprogs-always-y
2020-08-10 01:32:59 +09:00
Makefile.dtbinst
kbuild: refactor Makefile.dtbinst more
2020-03-25 10:19:43 +09:00
Makefile.extrawarn
Makefile.extrawarn: Move -Wunaligned-access to W=1
2022-02-16 12:54:30 +01:00
Makefile.gcc-plugins
gcc-plugins/structleak: add makefile var for disabling structleak
2021-10-27 09:56:54 +02:00
Makefile.headersinst
kbuild: move headers_check rule to usr/include/Makefile
2019-11-15 00:23:10 +09:00
Makefile.host
kbuild: sort hostprogs before passing it to ifneq
2020-08-10 01:32:59 +09:00
Makefile.kasan
kasan: fix hwasan build for gcc
2021-04-28 13:40:02 +02:00
Makefile.kcov
kbuild: include scripts/Makefile.* only when relevant CONFIG is enabled
2020-08-10 01:32:59 +09:00
Makefile.kcsan
Merge tag 'kbuild-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2020-10-22 13:13:57 -07:00
Makefile.lib
dt-bindings: Use json for processed-schema*
2020-08-19 14:31:57 -06:00
Makefile.modfinal
kbuild: preprocess module linker script
2020-09-25 00:36:41 +09:00
Makefile.modinst
kbuild: modinst: read modules.order instead of $(MODVERDIR)/*.mod
2019-07-17 22:39:27 +09:00
Makefile.modpost
kbuild: generate Module.symvers only when vmlinux exists
2021-05-19 10:12:59 +02:00
Makefile.modsign
kbuild: modsign: read modules.order instead of $(MODVERDIR)/*.mod
2019-07-17 22:39:27 +09:00
Makefile.package
kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables
2020-06-11 20:14:41 +09:00
Makefile.ubsan
ubsan: remove CONFIG_UBSAN_OBJECT_SIZE
2022-04-13 21:01:10 +02:00
Makefile.userprogs
kbuild: add infrastructure to build userspace programs
2020-05-17 18:52:01 +09:00
makelst
…
markup_oops.pl
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 373
2019-06-05 17:37:10 +02:00
mkcompile_h
kbuild: mkcompile_h: consider timestamp if KBUILD_BUILD_TIMESTAMP is set
2021-07-25 14:36:16 +02:00
mkmakefile
kbuild: get rid of $(realpath ...) from scripts/mkmakefile
2019-08-29 23:54:29 +09:00
mksysmap
mksysmap: Fix the mismatch of '.L' symbols in System.map
2020-06-06 23:39:20 +09:00
mkuboot.sh
…
module.lds.S
kbuild: lto: Merge module sections if and only if CONFIG_LTO_CLANG is enabled
2022-02-23 12:01:00 +01:00
modules-check.sh
kbuild: make module name conflict fatal error
2020-05-26 00:03:16 +09:00
nsdeps
scripts: add dummy report mode to add_namespace.cocci
2020-07-10 14:19:58 +02:00
objdiff
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 199
2019-05-30 11:29:23 -07:00
parse-maintainers.pl
parse-maintainers: Do not sort section content by default
2020-03-26 15:08:27 -07:00
patch-kernel
…
profile2linkerlist.pl
…
prune-kernel
…
recordmcount.c
ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount
2021-03-09 11:11:14 +01:00
recordmcount.h
recordmcount: Correct st_shndx handling
2021-06-30 08:47:23 -04:00
recordmcount.pl
recordmcount.pl: fix typo in s390 mcount regex
2022-01-05 12:40:29 +01:00
setlocalversion
scripts/setlocalversion: make git describe output more reliable
2020-09-25 02:28:12 +09:00
show_delta
tweewide: Fix most Shebang lines
2021-05-22 11:40:55 +02:00
sign-file.c
…
sorttable.c
s390/kernel: expand exception table logic to allow new handling options
2020-07-20 10:55:50 +02:00
sorttable.h
scripts/sorttable: Implement build-time ORC unwind table sorting
2019-12-13 10:47:58 +01:00
spdxcheck-test.sh
…
spdxcheck.py
scripts/spdxcheck.py: handle license identifiers in XML comments
2020-10-02 11:31:26 +02:00
spelling.txt
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2020-10-15 15:11:56 -07:00
sphinx-pre-install
scripts: sphinx-pre-install: Fix ctex support on Debian
2022-01-27 10:54:36 +01:00
split-man.pl
tweewide: Fix most Shebang lines
2021-05-22 11:40:55 +02:00
stackdelta
…
stackusage
…
subarch.include
…
tags.sh
Merge branch 'locking/urgent' into locking/core, to pick up fixes
2020-10-09 08:55:17 +02:00
tools-support-relr.sh
Makefile: fix GDB warning with CONFIG_RELR
2021-07-14 16:55:53 +02:00
unifdef.c
…
ver_linux
ver_linux: Query ld cache for versions of libc/libcpp run-time
2020-02-10 13:35:15 -08:00
xen-hypercalls.sh
…
xz_wrap.sh
kbuild: add variables for compression tools
2020-06-06 23:42:01 +09:00