acrn-kernel/arch/x86/lib
Petr Pavlu c8b056a3b4 x86/retpoline,kprobes: Fix position of thunk sections with CONFIG_LTO_CLANG
commit 79cd2a1122 upstream.

The linker script arch/x86/kernel/vmlinux.lds.S matches the thunk
sections ".text.__x86.*" from arch/x86/lib/retpoline.S as follows:

  .text {
    [...]
    TEXT_TEXT
    [...]
    __indirect_thunk_start = .;
    *(.text.__x86.*)
    __indirect_thunk_end = .;
    [...]
  }

Macro TEXT_TEXT references TEXT_MAIN which normally expands to only
".text". However, with CONFIG_LTO_CLANG, TEXT_MAIN becomes
".text .text.[0-9a-zA-Z_]*" which wrongly matches also the thunk
sections. The output layout is then different than expected. For
instance, the currently defined range [__indirect_thunk_start,
__indirect_thunk_end] becomes empty.

Prevent the problem by using ".." as the first separator, for example,
".text..__x86.indirect_thunk". This pattern is utilized by other
explicit section names which start with one of the standard prefixes,
such as ".text" or ".data", and that need to be individually selected in
the linker script.

  [ nathan: Fix conflicts with SRSO and fold in fix issue brought up by
    Andrew Cooper in post-review:
    https://lore.kernel.org/20230803230323.1478869-1-andrew.cooper3@citrix.com ]

Fixes: dc5723b02e ("kbuild: add support for Clang LTO")
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230711091952.27944-2-petr.pavlu@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-08-26 13:27:00 +02:00
..
.gitignore
Makefile x86: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN 2022-10-03 14:03:24 -07:00
atomic64_32.c
atomic64_386_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
atomic64_cx8_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
cache-smp.c
checksum_32.S x86/checksum_32: Remove .fixup usage 2021-12-11 09:09:49 +01:00
clear_page_64.S x86: fix clear_user_rep_good() exception handling annotation 2023-05-17 11:53:59 +02:00
cmdline.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
cmpxchg8b_emu.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
cmpxchg16b_emu.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
copy_mc.c x86, libnvdimm/test: Remove COPY_MC_TEST 2020-10-26 18:08:35 +01:00
copy_mc_64.S x86/copy_mc_64: Remove .fixup usage 2021-12-11 09:09:46 +01:00
copy_page_64.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
copy_user_64.S x86/uaccess: Don't jump between functions 2022-04-19 21:58:53 +02:00
cpu.c
csum-copy_64.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
csum-partial_64.c uml/x86: use x86 load_unaligned_zeropad() 2022-01-30 21:26:39 -05:00
csum-wrappers_64.c net: unexport csum_and_copy_{from,to}_user 2022-04-29 14:37:59 -07:00
delay.c x86/delay: Fix the wrong asm constraint in delay_loop() 2022-04-05 21:21:57 +02:00
error-inject.c x86/ibt: Annotate text references 2022-03-15 10:32:40 +01:00
getuser.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
hweight.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
inat.c x86/insn: Add a __ignore_sync_check__ marker 2021-03-15 11:00:57 +01:00
insn-eval.c x86/32: Remove lazy GS macros 2022-04-14 14:09:43 +02:00
insn.c x86/insn: Use get_unaligned() instead of memcpy() 2021-10-06 11:56:37 +02:00
iomap_copy_64.S x86/asm: Fix an assembler warning with current binutils 2023-01-24 07:24:31 +01:00
iomem.c x86: kmsan: handle open-coded assembly in lib/iomem.c 2022-10-03 14:03:24 -07:00
kaslr.c x86/kaslr: Fix build warning in KASLR code in boot stub 2022-04-11 09:41:12 +02:00
memcpy_32.c fortify: Detect struct member overflows in memmove() at compile-time 2022-02-13 16:50:06 -08:00
memcpy_64.S x86: Add types to indirectly called assembly functions 2022-09-26 10:13:15 -07:00
memmove_64.S x86: Use return-thunk in asm code 2022-06-27 10:33:58 +02:00
memset_64.S x86: clean up symbol aliasing 2022-02-22 16:21:34 +00:00
misc.c
msr-reg-export.c
msr-reg.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
msr-smp.c x86/msr: Fix wr/rdmsr_safe_regs_on_cpu() prototypes 2021-03-22 21:37:03 +01:00
msr.c x86/msr: Make locally used functions static 2021-04-08 11:57:40 +02:00
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/uaccess: Add ENDBR to __put_user_nocheck*() 2022-04-19 21:58:49 +02:00
retpoline.S x86/retpoline,kprobes: Fix position of thunk sections with CONFIG_LTO_CLANG 2023-08-26 13:27:00 +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
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/clear_user: Make it faster 2022-08-18 12:36:42 +02:00
x86-opcode-map.txt x86/insn: Add AVX512-FP16 instructions to the x86 instruction decoder 2022-01-23 20:38:01 +01:00