Messages in this thread Patch in this message | | | From | Josh Poimboeuf <> | Subject | [PATCH v2 04/20] objtool: Support retpoline jump detection for vmlinux.o | Date | Thu, 21 Jan 2021 15:29:20 -0600 |
| |
Objtool converts direct retpoline jumps to type INSN_JUMP_DYNAMIC, since that's what they are semantically.
That conversion doesn't work in vmlinux.o validation because the indirect thunk function is present in the object, so the intra-object jump check succeeds before the retpoline jump check gets a chance.
Rearrange the checks: check for a retpoline jump before checking for an intra-object jump.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> --- tools/objtool/check.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index c964cd56b557..5f5949951ca7 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -781,10 +781,6 @@ static int add_jump_destinations(struct objtool_file *file) } else if (reloc->sym->type == STT_SECTION) { dest_sec = reloc->sym->sec; dest_off = arch_dest_reloc_offset(reloc->addend); - } else if (reloc->sym->sec->idx) { - dest_sec = reloc->sym->sec; - dest_off = reloc->sym->sym.st_value + - arch_dest_reloc_offset(reloc->addend); } else if (!strncmp(reloc->sym->name, "__x86_indirect_thunk_", 21) || !strncmp(reloc->sym->name, "__x86_retpoline_", 16)) { /* @@ -798,6 +794,10 @@ static int add_jump_destinations(struct objtool_file *file) insn->retpoline_safe = true; continue; + } else if (reloc->sym->sec->idx) { + dest_sec = reloc->sym->sec; + dest_off = reloc->sym->sym.st_value + + arch_dest_reloc_offset(reloc->addend); } else { /* external sibling call */ insn->call_dest = reloc->sym; -- 2.29.2
| |