From owner-freebsd-security@freebsd.org Thu Jan 4 18:18:12 2018 Return-Path: Delivered-To: freebsd-security@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5BBC3EAB3FE for ; Thu, 4 Jan 2018 18:18:12 +0000 (UTC) (envelope-from gordon@tetlows.org) Received: from mail-ua0-x242.google.com (mail-ua0-x242.google.com [IPv6:2607:f8b0:400c:c08::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 19203773F9 for ; Thu, 4 Jan 2018 18:18:11 +0000 (UTC) (envelope-from gordon@tetlows.org) Received: by mail-ua0-x242.google.com with SMTP id a25so1647761uak.3 for ; Thu, 04 Jan 2018 10:18:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tetlows.org; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=r8uw/Opto3qhdKnVGzZokPkmMMpqw44STheIPRxu/XQ=; b=BLELdj8x+Bbo1a3sIXTPtCN0pFQenFYpbW2xtn2xIixRQeEuwZwZmzzt/pTOcDLe0O BS6d0V1RBdjYWSIZHe+t6f8fbRsLt+7RaXwOoe33XJuWaOpGLE/+7vVWCZztWdkCwDB5 fLg/LSqEttSmbutGHzyiN52nTYz+RhDowG8LI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=r8uw/Opto3qhdKnVGzZokPkmMMpqw44STheIPRxu/XQ=; b=BchQlJ6+DyvNN/8fABSpwJckShT9URHbF68GXkdHNAfcZVcv102yL0WrL9kFINVTFd Bg/15Y4lozNE0Sh/hk5WaApz9ZU5qjlDOPE5Yf8BFmHWVfE9gDG6uxBU15S1ajoYkLnz DVgkXS21XwC3407rN/ChfsmFavJmEpMNXlhfbzRgnqCV+CcBHodlwiEl42rScm+tERCt /KcLRVsFZcnHBbecUQB36eeyTf55X9yW1nBgs4UgqczW1lgbb9yOUZTfZN4WQiio+fXZ NghU7imMaREroUbc2QLBzJdH2TNEgIC0d147o4CSE7UsFOaQiYrpjj/oh7/6HMUDrPRh NvwQ== X-Gm-Message-State: AKwxyteSI30LUpyEUVtmwT1Trh6IcrQFMDpbnwNHhetZSYb7IDKrZm48 UVMrahqVwssXryq/BP9foolpE1fEzqvxRpy97Cap X-Google-Smtp-Source: ACJfBosP72kZ/nHotluTyX4WlzPXcDjScwCW+7kk55NchQWeeppCoNCoEz/7pGC5FxdfD4W9ZEjBEBH5DU0JJ9GxktE= X-Received: by 10.159.36.246 with SMTP id 109mr484806uar.111.1515089890752; Thu, 04 Jan 2018 10:18:10 -0800 (PST) MIME-Version: 1.0 Received: by 10.176.81.101 with HTTP; Thu, 4 Jan 2018 10:18:10 -0800 (PST) In-Reply-To: <43417734-d420-5be9-333b-8d0d02d7a58a@freebsd.org> References: <291645341.20180104190237@serebryakov.spb.ru> <43417734-d420-5be9-333b-8d0d02d7a58a@freebsd.org> From: Gordon Tetlow Date: Thu, 4 Jan 2018 11:18:10 -0700 Message-ID: Subject: Re: clang way to patch for Spectre? To: Julian Elischer Cc: Lev Serebryakov , "freebsd-security@freebsd.org" Content-Type: text/plain; charset="UTF-8" X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Jan 2018 18:18:12 -0000 On Thu, Jan 4, 2018 at 10:49 AM, Julian Elischer wrote: > On 5/1/18 12:02 am, Lev Serebryakov wrote: >> >> Hello Freebsd-security, >> >> https://reviews.llvm.org/D41723 >> >> > not really.. > > What's to stop an unprivileged used bringing his own compiler? or a > precompiled binary? If I'm reading this right (and there is a good chance I'm not), since unprivileged users don't bring the kernel or system libraries to the system, the mitigations would still work. Gordon