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linux/arch/x86/lib
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Pawan Gupta 5100004723 x86/its: Add support for ITS-safe return thunk 
commit a75bf27fe4 upstream.

RETs in the lower half of cacheline may be affected by ITS bug,
specifically when the RSB-underflows. Use ITS-safe return thunk for such
RETs.

RETs that are not patched:

- RET in retpoline sequence does not need to be patched, because the
  sequence itself fills an RSB before RET.
- RET in Call Depth Tracking (CDT) thunks __x86_indirect_{call|jump}_thunk
  and call_depth_return_thunk are not patched because CDT by design
  prevents RSB-underflow.
- RETs in .init section are not reachable after init.
- RETs that are explicitly marked safe with ANNOTATE_UNRET_SAFE.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-05-18 08:24:59 +02:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
atomic64_32.c x86: Adjust asm constraints in atomic64 wrappers 2012-01-20 17:29:31 -08:00
atomic64_386_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
atomic64_cx8_32.S locking/atomic/x86: Introduce the read64_nonatomic macro to x86_32 with cx8 2024-07-17 16:28:11 +02:00
cache-smp.c x86: fix missing includes/forward declarations 2023-12-20 16:40:30 -05:00
checksum_32.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
clear_page_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
cmdline.c x86/setup: Parse the builtin command line before merging 2024-07-31 21:46:35 +02:00
cmpxchg8b_emu.S Linux 6.8-rc4 2024-02-14 10:45:07 +01:00
cmpxchg16b_emu.S x86/percpu: Introduce %rip-relative addressing to PER_CPU_VAR() 2023-10-20 12:19:51 +02:00
copy_mc.c x86: call instrumentation hooks from copy_mc.c 2024-04-25 21:07:02 -07:00
copy_mc_64.S x86/copy_mc_64: Remove .fixup usage 2021-12-11 09:09:46 +01:00
copy_page_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
copy_user_64.S x86/uaccess: Improve performance by aligning writes to 8 bytes in copy_user_generic(), on non-FSRM/ERMS CPUs 2025-04-10 14:39:32 +02:00
copy_user_uncached_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
cpu.c x86/lib/cpu: Address missing prototypes warning 2019-08-08 08:25:53 +02:00
csum-copy_64.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
csum-partial_64.c x86/csum: clean up `csum_partial' further 2024-01-04 15:42:30 -08:00
csum-wrappers_64.c x86/lib: Address kernel-doc warnings 2023-10-03 22:46:47 +02:00
delay.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
error-inject.c x86/error_inject: Align function properly 2022-10-17 16:40:59 +02:00
getuser.S x86: fix user address masking non-canonical speculation issue 2024-10-25 09:53:03 -07:00
hweight.S x86 assembly code improvements for v6.7 are: 2023-10-30 14:18:00 -10:00
inat.c x86/insn: Add a __ignore_sync_check__ marker 2021-03-15 11:00:57 +01:00
insn-eval.c x86/insn-eval: Fix function param name in get_eff_addr_sib() 2024-02-13 22:41:25 +01:00
insn.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
iomem.c x86/kmsan: Fix hook for unaligned accesses 2024-06-25 11:37:21 +02:00
kaslr.c x86/kaslr: Fix build warning in KASLR code in boot stub 2022-04-11 09:41:12 +02:00
Makefile x86: Stop using weak symbols for __iowrite32_copy() 2024-04-22 17:11:19 -03:00
memcpy_32.c x86/mem: Move memmove to out of line assembler 2022-11-01 15:44:07 -07:00
memcpy_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
memmove_32.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
memmove_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
memset_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
misc.c x86/lib: Fix overflow when counting digits 2023-11-17 06:26:14 -08:00
msr-reg-export.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
msr-reg.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
msr-smp.c x86/msr: Add missing __percpu annotations 2024-03-04 12:01:54 +01:00
msr.c x86/msr: Add missing __percpu annotations 2024-03-04 12:01:54 +01:00
pc-conf-reg.c x86: Add support for 0x22/0x23 port I/O configuration space 2021-08-10 23:31:43 +02:00
putuser.S x86/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups 2024-01-29 11:40:41 +01:00
retpoline.S x86/its: Add support for ITS-safe return thunk 2025-05-18 08:24:59 +02:00
string_32.c lib/string: Move helper functions out of string.c 2021-09-25 08:20:49 -07:00
strstr_32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
usercopy.c x86/uaccess: instrument copy_from_user_nmi() 2022-11-08 15:57:24 -08:00
usercopy_32.c x86/usercopy: Remove .fixup usage 2021-12-11 09:09:50 +01:00
usercopy_64.c x86/usercopy: Include arch_wb_cache_pmem() declaration 2023-05-18 11:56:18 -07:00
x86-opcode-map.txt x86/insn: Fix CTEST instruction decoding 2025-05-02 07:59:07 +02:00