Peter Zijlstra e32542e9ed objtool: Only rewrite unconditional retpoline thunk calls ...

commit 2d49b721dc upstream.

It turns out that the compilers generate conditional branches to the
retpoline thunks like:

  5d5:   0f 85 00 00 00 00       jne    5db <cpuidle_reflect+0x22>
	5d7: R_X86_64_PLT32     __x86_indirect_thunk_r11-0x4

while the rewrite can only handle JMP/CALL to the thunks. The result
is the alternative wrecking the code. Make sure to skip writing the
alternatives for conditional branches.

Fixes: 9bc0bb5072 ("objtool/x86: Rewrite retpoline thunk calls")
Reported-by: Lukasz Majczak <lma@semihalf.com>
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-07-25 11:26:19 +02:00

..

arch/x86

objtool: Only rewrite unconditional retpoline thunk calls

2022-07-25 11:26:19 +02:00

Documentation

objtool: Support stack layout changes in alternatives

2022-07-25 11:26:06 +02:00

.gitignore

.gitignore: add SPDX License Identifier

2020-03-25 11:50:48 +01:00

arch.h

objtool: Keep track of retpoline call sites

2022-07-25 11:26:17 +02:00

Build

objtool: Enable compilation of objtool for all architectures

2020-05-20 09:17:28 -05:00

builtin-check.c

objtool: Move ORC logic out of check()

2020-09-01 17:19:11 -05:00

builtin-orc.c

objtool: Refactor ORC section generation

2022-07-25 11:26:05 +02:00

builtin.h

objtool: Implement noinstr validation

2020-04-22 10:53:50 +02:00

cfi.h

objtool: Fix !CFI insn_state propagation

2020-04-22 10:53:50 +02:00

check.c

objtool: Support asm jump tables

2022-07-25 11:26:18 +02:00

check.h

objtool: Cache instruction relocs

2022-07-25 11:26:17 +02:00

elf.c

objtool: Fix .symtab_shndx handling for elf_create_undef_symbol()

2022-07-25 11:26:19 +02:00

elf.h

objtool: Add elf_create_undef_symbol()

2022-07-25 11:26:16 +02:00

Makefile

objtool: Refactor ORC section generation

2022-07-25 11:26:05 +02:00

objtool.c

objtool: Keep track of retpoline call sites

2022-07-25 11:26:17 +02:00

objtool.h

objtool: Keep track of retpoline call sites

2022-07-25 11:26:17 +02:00

orc_dump.c

objtool: Make unwind hint definitions available to other architectures

2020-09-10 10:43:13 -05:00

orc_gen.c

objtool: Create reloc sections implicitly

2022-07-25 11:26:15 +02:00

special.c

objtool: Skip magical retpoline .altinstr_replacement

2022-07-25 11:26:18 +02:00

special.h

objtool: Refactor jump table code to support other architectures

2020-09-10 10:43:13 -05:00

sync-check.sh

x86/insn: Add a __ignore_sync_check__ marker

2022-07-25 11:26:11 +02:00

warn.h

objtool: Rename find_containing_func()

2020-03-25 18:28:29 +01:00

weak.c

objtool: Refactor ORC section generation

2022-07-25 11:26:05 +02:00