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Linus Torvalds 7001052160 Add support for Intel CET-IBT, available since Tigerlake (11th gen), which is a 
coarse grained, hardware based, forward edge Control-Flow-Integrity mechanism
 where any indirect CALL/JMP must target an ENDBR instruction or suffer #CP.
 
 Additionally, since Alderlake (12th gen)/Sapphire-Rapids, speculation is
 limited to 2 instructions (and typically fewer) on branch targets not starting
 with ENDBR. CET-IBT also limits speculation of the next sequential instruction
 after the indirect CALL/JMP [1].
 
 CET-IBT is fundamentally incompatible with retpolines, but provides, as
 described above, speculation limits itself.
 
 [1] https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/branch-history-injection.html
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Merge tag 'x86_core_for_5.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 CET-IBT (Control-Flow-Integrity) support from Peter Zijlstra:
 "Add support for Intel CET-IBT, available since Tigerlake (11th gen),
  which is a coarse grained, hardware based, forward edge
  Control-Flow-Integrity mechanism where any indirect CALL/JMP must
  target an ENDBR instruction or suffer #CP.

  Additionally, since Alderlake (12th gen)/Sapphire-Rapids, speculation
  is limited to 2 instructions (and typically fewer) on branch targets
  not starting with ENDBR. CET-IBT also limits speculation of the next
  sequential instruction after the indirect CALL/JMP [1].

  CET-IBT is fundamentally incompatible with retpolines, but provides,
  as described above, speculation limits itself"

[1] https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/branch-history-injection.html

* tag 'x86_core_for_5.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (53 commits)
  kvm/emulate: Fix SETcc emulation for ENDBR
  x86/Kconfig: Only allow CONFIG_X86_KERNEL_IBT with ld.lld >= 14.0.0
  x86/Kconfig: Only enable CONFIG_CC_HAS_IBT for clang >= 14.0.0
  kbuild: Fixup the IBT kbuild changes
  x86/Kconfig: Do not allow CONFIG_X86_X32_ABI=y with llvm-objcopy
  x86: Remove toolchain check for X32 ABI capability
  x86/alternative: Use .ibt_endbr_seal to seal indirect calls
  objtool: Find unused ENDBR instructions
  objtool: Validate IBT assumptions
  objtool: Add IBT/ENDBR decoding
  objtool: Read the NOENDBR annotation
  x86: Annotate idtentry_df()
  x86,objtool: Move the ASM_REACHABLE annotation to objtool.h
  x86: Annotate call_on_stack()
  objtool: Rework ASM_REACHABLE
  x86: Mark __invalid_creds() __noreturn
  exit: Mark do_group_exit() __noreturn
  x86: Mark stop_this_cpu() __noreturn
  objtool: Ignore extra-symbol code
  objtool: Rename --duplicate to --lto
  ...
2022-03-27 10:17:23 -07:00
..
accounting delayacct: track delays from memory compact 2022-01-20 08:52:55 +02:00
arch platform-drivers-x86 for v5.18-1 2022-03-25 12:14:39 -07:00
bootconfig
bpf bpftool: Fix a bug in subskeleton code generation 2022-03-21 14:46:10 -07:00
build Merge remote-tracking branch 'torvalds/master' into perf/core 2022-01-13 10:20:59 -03:00
cgroup tools/cgroup/slabinfo: update to work with struct slab 2022-02-21 11:34:49 +01:00
counter
debugging
edid
firewire
firmware
gpio
hv
iio
include Add support for Intel CET-IBT, available since Tigerlake (11th gen), which is a 2022-03-27 10:17:23 -07:00
io_uring
kvm/kvm_stat
laptop
leds
lib Networking changes for 5.18. 2022-03-24 13:13:26 -07:00
memory-model tools/memory-model: Explain syntactic and semantic dependencies 2022-02-01 17:32:30 -08:00
objtool objtool: Find unused ENDBR instructions 2022-03-15 10:32:47 +01:00
pci
pcmcia
perf s390 updates for the 5.18 merge window 2022-03-25 10:01:34 -07:00
power Thermal control updates for 5.18-rc1 2022-03-21 14:35:11 -07:00
rcu
scripts tools: Fix unavoidable GCC call in Clang builds 2022-03-08 23:36:37 +01:00
spi
testing platform-drivers-x86 for v5.18-1 2022-03-25 12:14:39 -07:00
thermal/tmon
time
tracing rtla: Tools main loop cleanup 2022-03-15 14:36:50 -04:00
usb
virtio tools/virtio: handle fallout from folio work 2022-03-06 06:06:50 -05:00
vm tools/vm/page_owner_sort.c: support for user-defined culling rules 2022-03-24 19:06:45 -07:00
wmi
Makefile