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Peter Zijlstra 370d33da35 x86: Add straight-line-speculation mitigation 
[ Upstream commit e463a09af2f0677b9485a7e8e4e70b396b2ffb6f ]

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>
2022-05-15 20:18:51 +02:00
..
alpha
rtc: Check return value from mc146818_get_time()
2022-04-13 20:59:14 +02:00
arc
ARC: entry: fix syscall_trace_exit argument
2022-04-27 14:39:00 +02:00
arm
ARM: dts: at91: sama7g5ek: enable pull-up on flexcom3 console lines
2022-05-09 09:14:42 +02:00
arm64
ARM: dts: imx8mm-venice-gw{71xx,72xx,73xx}: fix OTG controller OC mode
2022-05-09 09:14:42 +02:00
csky
uaccess: fix type mismatch warnings from access_ok()
2022-04-08 14:24:01 +02:00
h8300
Merge branch 'akpm' (patches from Andrew)
2021-09-08 12:55:35 -07:00
hexagon
uaccess: fix integer overflow on access_ok()
2022-03-28 09:58:45 +02:00
ia64
PCI/sysfs: Find shadow ROM before static attribute initialization
2022-02-01 17:27:05 +01:00
m68k
m68k: coldfire/device.c: only build for MCF_EDMA when h/w macros are defined
2022-04-08 14:23:20 +02:00
microblaze
uaccess: fix nios2 and microblaze get_user_8()
2022-04-08 14:23:18 +02:00
mips
MIPS: Fix CP0 counter erratum detection for R4k CPUs
2022-05-12 12:30:00 +02:00
nds32
nds32: fix access_ok() checks in get/put_user
2022-03-28 09:58:46 +02:00
nios2
uaccess: fix type mismatch warnings from access_ok()
2022-04-08 14:24:01 +02:00
openrisc
openrisc: Add clone3 ABI wrapper
2022-01-27 11:04:10 +01:00
parisc
Revert "parisc: Mark sched_clock unstable only if clocks are not syncronized"
2022-05-12 12:30:26 +02:00
powerpc
powerpc/64: Add UADDR64 relocation support
2022-05-09 09:14:44 +02:00
riscv
RISC-V: relocate DTB if it's outside memory region
2022-05-12 12:30:04 +02:00
s390
s390/extable: fix exception table sorting
2022-03-08 19:12:48 +01:00
sh
Documentation, arch: Remove leftovers from CIFS_WEAK_PW_HASH
2022-01-27 11:05:21 +01:00
sparc
uaccess: fix type mismatch warnings from access_ok()
2022-04-08 14:24:01 +02:00
um
um: fix and optimize xor select template for CONFIG64 and timetravel mode
2022-04-13 20:58:59 +02:00
x86
x86: Add straight-line-speculation mitigation
2022-05-15 20:18:51 +02:00
xtensa
arch: xtensa: platforms: Fix deadlock in rs_close()
2022-05-09 09:14:40 +02:00
.gitignore
…
Kconfig
stack: Constrain and fix stack offset randomization with Clang builds
2022-04-08 14:23:06 +02:00