From owner-freebsd-security@freebsd.org Fri Apr 17 14:04:15 2020 Return-Path: Delivered-To: freebsd-security@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id BE5372BA891 for ; Fri, 17 Apr 2020 14:04:15 +0000 (UTC) (envelope-from carpeddiem@gmail.com) Received: from mail-il1-f177.google.com (mail-il1-f177.google.com [209.85.166.177]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 493dB66NWDz3xjZ for ; Fri, 17 Apr 2020 14:04:14 +0000 (UTC) (envelope-from carpeddiem@gmail.com) Received: by mail-il1-f177.google.com with SMTP id i2so2175718ils.12 for ; Fri, 17 Apr 2020 07:04:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=4hUHWoEDZEeunCW4SzSLZM2Ae4yLjXp90L0m1aJGfkE=; b=Rn8JfSu5szh462hEV6Sm94bNGpourDf5ny1YpWOYP1xtbBQ3QK8jjFcftDcbOxVkTr BtaPdyKH9l3zGPdy5cHf39zRwbEHdeJfBcizlWxuwtq85zcjGIXJBFpabbJvki1pA2zC NBP+dOYia21qsPdYBLw84EWcGRGbW0dWOqjVZxxzkClOwKg+IgWR+kwvwQz4800j5tfD c5lRFNZSRdr+PVgZ7jjCw5V6DXEx9I3lBbtiXeeGtnubmp/bK/gy4S8sZUZzBWX0TASc uUyl8TSjJVjqcEYRAhKhlFyw85cYHI44sEVh3L1Cd8KJkRL6geLGyHovnyWbXEapX8OS Bhuw== X-Gm-Message-State: AGi0PuZAGoAb5OW/fSP0qWBOnfh4JRy2yVRDr9zi72rQ5sqv9/s0u7ux NYUp3pt+59LmFKM3kUPEqr7jXCHXsisZ2wqIfIfnsg== X-Google-Smtp-Source: APiQypJmxN6qUViubEY1S6mweofReR2ndTPMyj0w6+8K5rv4cEWEBn0U/nIj3wN0iVYvDbKL47N44oNf5XBxDMSNrGo= X-Received: by 2002:a05:6e02:141:: with SMTP id j1mr3268858ilr.100.1587132253331; Fri, 17 Apr 2020 07:04:13 -0700 (PDT) MIME-Version: 1.0 References: <20200417130658.wijvhim5ylvgptub@mutt-hbsd> In-Reply-To: <20200417130658.wijvhim5ylvgptub@mutt-hbsd> From: Ed Maste Date: Fri, 17 Apr 2020 10:04:01 -0400 Message-ID: Subject: Re: ASLR/PIE status in FreeBSD HEAD To: Shawn Webb Cc: Marcin Wojtas , freebsd-security@freebsd.org, Rafal Jaworowski Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 493dB66NWDz3xjZ X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of carpeddiem@gmail.com designates 209.85.166.177 as permitted sender) smtp.mailfrom=carpeddiem@gmail.com X-Spamd-Result: default: False [-3.57 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-security@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[177.166.85.209.list.dnswl.org : 127.0.5.0]; IP_SCORE(-1.57)[ip: (-6.96), ipnet: 209.85.128.0/17(-0.40), asn: 15169(-0.43), country: US(-0.05)]; FORGED_SENDER(0.30)[emaste@freebsd.org,carpeddiem@gmail.com]; RWL_MAILSPIKE_POSSIBLE(0.00)[177.166.85.209.rep.mailspike.net : 127.0.0.17]; R_DKIM_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; FROM_NEQ_ENVFROM(0.00)[emaste@freebsd.org,carpeddiem@gmail.com]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 Apr 2020 14:04:15 -0000 On Fri, 17 Apr 2020 at 09:13, Shawn Webb wrote: > > Quick note: paxtest's algorithms for measuring ASLR was meant to test > ASLR, not FreeBSD's ASR implementation. Thus, paxtest results for > FreeBSD's ASR are moot. paxtest's entropy estimate is superficial, and indeed can produce a more or less invalid result depending on the distribution of allocated objects. There are a number of other tools which perform a more rigorous or comprehensive analysis. paxtest is useful in providing basic indication of whether various things are randomized or not.