From owner-svn-src-all@freebsd.org Sat Sep 21 18:00:23 2019 Return-Path: Delivered-To: svn-src-all@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 CCC4912B455; Sat, 21 Sep 2019 18:00:23 +0000 (UTC) (envelope-from kib@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 46bJK34zPdz3KjG; Sat, 21 Sep 2019 18:00:23 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (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 8E2DB19EAD; Sat, 21 Sep 2019 18:00:23 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x8LI0NaI043287; Sat, 21 Sep 2019 18:00:23 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x8LI0Np1043286; Sat, 21 Sep 2019 18:00:23 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201909211800.x8LI0Np1043286@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Sat, 21 Sep 2019 18:00:23 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r352582 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: kib X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 352582 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Sep 2019 18:00:23 -0000 Author: kib Date: Sat Sep 21 18:00:23 2019 New Revision: 352582 URL: https://svnweb.freebsd.org/changeset/base/352582 Log: Make non-ASLR pie base tunable. Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/kern/imgact_elf.c Modified: head/sys/kern/imgact_elf.c ============================================================================== --- head/sys/kern/imgact_elf.c Sat Sep 21 17:59:15 2019 (r352581) +++ head/sys/kern/imgact_elf.c Sat Sep 21 18:00:23 2019 (r352582) @@ -135,6 +135,11 @@ SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_R "enable execution from readable segments"); #endif +static u_long __elfN(pie_base) = ET_DYN_LOAD_ADDR; +SYSCTL_ULONG(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, pie_base, + CTLFLAG_RWTUN, &__elfN(pie_base), 0, + "PIE load base without randomization"); + SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr, CTLFLAG_RW, 0, ""); #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr) @@ -1146,13 +1151,13 @@ __CONCAT(exec_, __elfN(imgact))(struct image_params *i if (baddr == 0) { if ((sv->sv_flags & SV_ASLR) == 0 || (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) - et_dyn_addr = ET_DYN_LOAD_ADDR; + et_dyn_addr = __elfN(pie_base); else if ((__elfN(pie_aslr_enabled) && (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) || (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0) et_dyn_addr = ET_DYN_ADDR_RAND; else - et_dyn_addr = ET_DYN_LOAD_ADDR; + et_dyn_addr = __elfN(pie_base); } }