From f43b9876e857c739d407bc56df288b0ebe1a9164 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 27 Jun 2022 22:21:17 +0000 Subject: x86/retbleed: Add fine grained Kconfig knobs Do fine-grained Kconfig for all the various retbleed parts. NOTE: if your compiler doesn't support return thunks this will silently 'upgrade' your mitigation to IBPB, you might not like this. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov --- tools/objtool/check.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'tools/objtool/check.c') diff --git a/tools/objtool/check.c b/tools/objtool/check.c index ddfdd138cc2a..7bebdb8867cd 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -3732,8 +3732,11 @@ static int validate_retpoline(struct objtool_file *file) continue; if (insn->type == INSN_RETURN) { - WARN_FUNC("'naked' return found in RETPOLINE build", - insn->sec, insn->offset); + if (opts.rethunk) { + WARN_FUNC("'naked' return found in RETHUNK build", + insn->sec, insn->offset); + } else + continue; } else { WARN_FUNC("indirect %s found in RETPOLINE build", insn->sec, insn->offset, @@ -4264,7 +4267,9 @@ int check(struct objtool_file *file) if (ret < 0) goto out; warnings += ret; + } + if (opts.rethunk) { ret = create_return_sites_sections(file); if (ret < 0) goto out; -- cgit v1.2.3