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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
..
preload bpf: Remove redundant slash 2022-03-07 22:19:32 -08:00
arraymap.c bpf: generalise tail call map compatibility check 2022-01-21 14:14:03 -08:00
bloom_filter.c bpf: Add missing map_get_next_key method to bloom filter map. 2021-12-29 09:38:31 -08:00
bpf_inode_storage.c bpf: Enable non-atomic allocations in local storage 2022-03-20 18:55:05 -07:00
bpf_iter.c bpf: Add support for bpf iterator programs to use sleepable helpers 2022-01-24 19:55:40 -08:00
bpf_local_storage.c bpf: Enable non-atomic allocations in local storage 2022-03-20 18:55:05 -07:00
bpf_lru_list.c bpf_lru_list: Read double-checked variable once without lock 2021-02-10 15:54:26 -08:00
bpf_lru_list.h
bpf_lsm.c bpf-lsm: Make bpf_lsm_kernel_read_file() as sleepable 2022-03-10 18:57:55 -08:00
bpf_struct_ops_types.h bpf: Add dummy BPF STRUCT_OPS for test purpose 2021-11-01 14:10:00 -07:00
bpf_struct_ops.c bpf: Rename btf_member accessors. 2021-12-02 11:18:34 -08:00
bpf_task_storage.c bpf: Enable non-atomic allocations in local storage 2022-03-20 18:55:05 -07:00
btf.c bpf: Simplify check in btf_parse_hdr() 2022-03-21 14:49:28 +01:00
cgroup.c bpf: Cleanup comments 2022-02-23 15:17:51 -08:00
core.c bpf: Fix bpf_prog_pack when PMU_SIZE is not defined 2022-03-21 13:53:45 -07:00
cpumap.c bpf: generalise tail call map compatibility check 2022-01-21 14:14:03 -08:00
devmap.c bpf: generalise tail call map compatibility check 2022-01-21 14:14:03 -08:00
disasm.c bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause 2021-09-02 14:49:23 +02:00
disasm.h bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause 2021-09-02 14:49:23 +02:00
dispatcher.c
hashtab.c bpf: Cleanup comments 2022-02-23 15:17:51 -08:00
helpers.c bpf: Replace strncpy() with strscpy() 2022-03-07 22:04:33 -08:00
inode.c bpf: Convert bpf_preload.ko to use light skeleton. 2022-02-10 23:31:51 +01:00
Kconfig bpf: Add "live packet" mode for XDP in BPF_PROG_RUN 2022-03-09 14:19:22 -08:00
local_storage.c bpf: Cleanup comments 2022-02-23 15:17:51 -08:00
lpm_trie.c bpf: Fix typo in a comment in bpf lpm_trie. 2021-12-30 18:42:34 -08:00
Makefile bpf: Prepare relo_core.c for kernel duty. 2021-12-02 11:18:34 -08:00
map_in_map.c bpf: Remember BTF of inner maps. 2021-07-15 22:31:10 +02:00
map_in_map.h
map_iter.c bpf: Introduce MEM_RDONLY flag 2021-12-18 13:27:41 -08:00
mmap_unlock_work.h bpf: Introduce helper bpf_find_vma 2021-11-07 11:54:51 -08:00
net_namespace.c net: Add includes masked by netdevice.h including uapi/bpf.h 2021-12-29 20:03:05 -08:00
offload.c
percpu_freelist.c
percpu_freelist.h
prog_iter.c
queue_stack_maps.c bpf: Eliminate rlimit-based memory accounting for queue_stack_maps maps 2020-12-02 18:32:46 -08:00
reuseport_array.c bpf: Cleanup comments 2022-02-23 15:17:51 -08:00
ringbuf.c bpf: Use VM_MAP instead of VM_ALLOC for ringbuf 2022-02-02 23:15:24 -08:00
stackmap.c bpf: Adjust BPF stack helper functions to accommodate skip > 0 2022-03-20 19:16:23 -07:00
syscall.c bpf: Add cookie support to programs attached with kprobe multi link 2022-03-17 20:17:19 -07:00
sysfs_btf.c bpf: Load and verify kernel module BTFs 2020-11-10 15:25:53 -08:00
task_iter.c bpf: Introduce btf_tracing_ids 2021-11-12 10:19:09 -08:00
tnum.c bpf, tnums: Provably sound, faster, and more precise algorithm for tnum_mul 2021-06-01 13:34:15 +02:00
trampoline.c Add support for Intel CET-IBT, available since Tigerlake (11th gen), which is a 2022-03-27 10:17:23 -07:00
verifier.c bpf: Fix warning for cast from restricted gfp_t in verifier 2022-03-21 13:29:16 -07:00