From: Peter Zijlstra peterz@infradead.org
commit bcb1b6ff39da7e8a6a986eb08126fba2b5e13c32 upstream.
Just like JMP handling, convert a direct CALL to a retpoline thunk into a retpoline safe indirect CALL.
Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Borislav Petkov bp@suse.de Signed-off-by: Ingo Molnar mingo@kernel.org Reviewed-by: Miroslav Benes mbenes@suse.cz Link: https://lkml.kernel.org/r/20210326151259.567568238@infradead.org Signed-off-by: Ben Hutchings ben@decadent.org.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/objtool/check.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -953,6 +953,18 @@ static int add_call_destinations(struct dest_off); return -1; } + + } else if (!strncmp(reloc->sym->name, "__x86_indirect_thunk_", 21)) { + /* + * Retpoline calls are really dynamic calls in + * disguise, so convert them accordingly. + */ + insn->type = INSN_CALL_DYNAMIC; + insn->retpoline_safe = true; + + remove_insn_ops(insn); + continue; + } else insn->call_dest = reloc->sym;