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 59E22CD8CB6 for ; Tue, 10 Oct 2023 20:07:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234730AbjJJUHO (ORCPT ); Tue, 10 Oct 2023 16:07:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53394 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234421AbjJJUGy (ORCPT ); Tue, 10 Oct 2023 16:06:54 -0400 Received: from mail.alien8.de (mail.alien8.de [IPv6:2a01:4f9:3051:3f93::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E3BAB93 for ; Tue, 10 Oct 2023 13:04:45 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id B2B6B40E014B; Tue, 10 Oct 2023 20:04:42 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id KGg7Umx757r3; Tue, 10 Oct 2023 20:04:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1696968281; bh=BDKdSZWI1t4rPS1G0WEtrLn+R5W1McIc6NS5rdPWBYo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XXrESqsNZb+oI+9Em3rNQHFUgFwk8Ia+3gekXb7BpntVGHMAWHxxcEIiUsQp5RHJ4 msKRfmQd/xPW0g96dJjl9yW+gLJzQO0Dv+zY7HoxDv+nO5lMjSG6QFVv+nnQtKnFoR LD6PlMxymWFxUKP15mE+lqgT60MbOSU8Sv3cw/sppUFXn07aOjgFVTCUaEPR/1M0V9 3+nI7l35GWkN27jWMxRj8f++eyB7FcFNBLuTieXPw4v67MHXJ4k31T2Qwz66u6V4ay WjWm/zBHv0xnYG326YWQrDNuwXl8/ZCnLPcd3rjTV0qRJ1HSAMPrOsByBOG2yW0GnZ 8ErDhLwxgIO5DkuE8L4UInAUeAA+H9ZmGT7TCYhpsjagFdLWAIFLTsK/Bdl45fEr7/ J8DmGDpz5XDv6vYSAzd659rdW2v6daEhFSUCuDrQ/E7CqUqxgIpuwLIbBln89g2Vus Gk6Axy7av8NH/FtWGwugiTMGGWi9Evl97Wq3XwtIwi9RZ2VGGzH2D+4U2giiEVIXFm w89JvoIuL2005FACZKF8H96WnhesTdCYg7qkBNRY/+7n52jb5Wko7kQonbElsWBjPA J13MntSFWfSrMNiv5Drowr7gYnFIXVsR2HypLUrNz7190fYRVSQ0kETuujo5LZVLal e7Z5CVUVZKlbyDbIky8DawPw= Received: from zn.tnic (pd953036a.dip0.t-ipconnect.de [217.83.3.106]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id E5DAB40E0187; Tue, 10 Oct 2023 20:04:34 +0000 (UTC) Date: Tue, 10 Oct 2023 22:04:29 +0200 From: Borislav Petkov To: Josh Poimboeuf Cc: Peter Zijlstra , David Kaplan , x86@kernel.org, luto@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] Revert "x86/retpoline: Remove .text..__x86.return_thunk section" Message-ID: <20231010200429.GIZSWuTWSUM9aId7a6@fat_crate.local> References: <20231010171020.462211-1-david.kaplan@amd.com> <20231010171020.462211-2-david.kaplan@amd.com> <20231010174833.GG14330@noisy.programming.kicks-ass.net> <20231010195721.p5pb273kevg7ydxz@treble> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20231010195721.p5pb273kevg7ydxz@treble> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 10, 2023 at 12:57:21PM -0700, Josh Poimboeuf wrote: > Also we could make objtool properly detect the non-relocated jump > target. I was wondering about that... I guess it can compute the JMP target and compare it to the address of __x86_return_thunk? -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette