From owner-freebsd-bugs@freebsd.org Fri Aug 16 13:24:12 2019 Return-Path: Delivered-To: freebsd-bugs@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 49E31CC405 for ; Fri, 16 Aug 2019 13:24:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4693v01KL6z4GK1 for ; Fri, 16 Aug 2019 13:24:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 29FA1CC404; Fri, 16 Aug 2019 13:24:12 +0000 (UTC) Delivered-To: bugs@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 29C0ACC403 for ; Fri, 16 Aug 2019 13:24:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4693v00GKwz4GJy for ; Fri, 16 Aug 2019 13:24:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id E0C1219A2 for ; Fri, 16 Aug 2019 13:24:11 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id x7GDOB24050095 for ; Fri, 16 Aug 2019 13:24:11 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id x7GDOBim050091 for bugs@FreeBSD.org; Fri, 16 Aug 2019 13:24:11 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 239894] security.bsd.stack_guard_page default causes Java to crash Date: Fri, 16 Aug 2019 13:24:11 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 12.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: kurt@intricatesoftware.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Aug 2019 13:24:12 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D239894 Kurt Miller changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |kurt@intricatesoftware.com --- Comment #1 from Kurt Miller --- I'd like to additionally point out the current implementation of kernel pla= ced guard pages for MAP_STACK has issues that result in three bugs not specific= ally related to the jvm: 1) pthread_attr_setguardsize(3) is not working when its size !=3D security.bsd.stack_guard_page size. 2) pthread_create(3) will fail if security.bsd.stack_guard_page is set to number that is greater than pthread_attr_setstacksize(3) size in pages. 3) mprotect(2) of MAP_STACK pages has no effect unless the pages have been touched previously. Test programs for #1 and #2 can be found here: https://github.com/battleblow/openjdk-jdk11u/issues/51#issuecomment-5220059= 54 #3 is demonstrated by test the program pthread_attr_setguardsize_test.c when security.bsd.stack_guard_page is set to 1. libthr uses mprotect(3) to set i= ts guard pages and is the reason this test fails. --=20 You are receiving this mail because: You are the assignee for the bug.=