From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96689C7EE43 for ; Thu, 24 Aug 2023 15:04:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235559AbjHXPEP (ORCPT ); Thu, 24 Aug 2023 11:04:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242076AbjHXPDx (ORCPT ); Thu, 24 Aug 2023 11:03:53 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 690FA19A6 for ; Thu, 24 Aug 2023 08:03:51 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 020D6670D7 for ; Thu, 24 Aug 2023 15:03:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1184CC433C8; Thu, 24 Aug 2023 15:03:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1692889430; bh=9j2RxtlGEKasipT9a2aKQFN2eW4IAM65rAafoRtIcTk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hW5O9RKuFLGYXzHLmBO7iS330ZT9DdTWWLQnSILc7odkmo1IWUtNapYF7PEE5mnvM fhEbLuG4vTAmiaOL7N5zpkwZJufOrUSHLKxkWBKlcDTPw3Th0CMZxebY/1p09x1vH7 gylUNTQQjS9RV+AIvQnrXdOeCbXppfLt83Y6LafM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Peter Zijlstra (Intel)" , "Borislav Petkov (AMD)" , Josh Poimboeuf Subject: [PATCH 5.10 134/135] objtool/x86: Fixup frame-pointer vs rethunk Date: Thu, 24 Aug 2023 16:51:17 +0200 Message-ID: <20230824145032.861156217@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230824145027.008282920@linuxfoundation.org> References: <20230824145027.008282920@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peter Zijlstra commit dbf46008775516f7f25c95b7760041c286299783 upstream. For stack-validation of a frame-pointer build, objtool validates that every CALL instruction is preceded by a frame-setup. The new SRSO return thunks violate this with their RSB stuffing trickery. Extend the __fentry__ exception to also cover the embedded_insn case used for this. This cures: vmlinux.o: warning: objtool: srso_untrain_ret+0xd: call without frame pointer save/setup Fixes: 4ae68b26c3ab ("objtool/x86: Fix SRSO mess") Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov (AMD) Acked-by: Josh Poimboeuf Link: https://lore.kernel.org/r/20230816115921.GH980931@hirez.programming.kicks-ass.net Signed-off-by: Greg Kroah-Hartman --- tools/objtool/check.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2079,12 +2079,17 @@ static int decode_sections(struct objtoo return 0; } -static bool is_fentry_call(struct instruction *insn) +static bool is_special_call(struct instruction *insn) { - if (insn->type == INSN_CALL && - insn->call_dest && - insn->call_dest->fentry) - return true; + if (insn->type == INSN_CALL) { + struct symbol *dest = insn->call_dest; + + if (!dest) + return false; + + if (dest->fentry) + return true; + } return false; } @@ -2958,7 +2963,7 @@ static int validate_branch(struct objtoo if (ret) return ret; - if (!no_fp && func && !is_fentry_call(insn) && + if (!no_fp && func && !is_special_call(insn) && !has_valid_stack_frame(&state)) { WARN_FUNC("call without frame pointer save/setup", sec, insn->offset);