From owner-dev-commits-src-all@freebsd.org Mon Jul 19 04:07:15 2021 Return-Path: Delivered-To: dev-commits-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 4DCC5676F91; Mon, 19 Jul 2021 04:07:15 +0000 (UTC) (envelope-from git@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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4GSpFv1SKbz3kVg; Mon, 19 Jul 2021 04:07:15 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 14B1310A40; Mon, 19 Jul 2021 04:07:15 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 16J47Eum055233; Mon, 19 Jul 2021 04:07:14 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 16J47EU3055232; Mon, 19 Jul 2021 04:07:14 GMT (envelope-from git) Date: Mon, 19 Jul 2021 04:07:14 GMT Message-Id: <202107190407.16J47EU3055232@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Kyle Evans Subject: git: 7a129c973b5b - main - kern: add an option for preserving the early kenv MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kevans X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 7a129c973b5ba0fa916dfa658d523bec66dbd02d Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Jul 2021 04:07:15 -0000 The branch main has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=7a129c973b5ba0fa916dfa658d523bec66dbd02d commit 7a129c973b5ba0fa916dfa658d523bec66dbd02d Author: Kyle Evans AuthorDate: 2021-06-20 19:29:31 +0000 Commit: Kyle Evans CommitDate: 2021-07-19 04:05:48 +0000 kern: add an option for preserving the early kenv Some downstream configurations do not store secrets in the early (loader/static) environments and desire a way to preserve these for diagnostic reasons. Provide an option to do so. Reviewed by: imp, jhb (earlier version) Differential Revision: https://reviews.freebsd.org/D30834 --- sys/conf/options | 8 ++++++++ sys/kern/kern_environment.c | 4 ++++ 2 files changed, 12 insertions(+) diff --git a/sys/conf/options b/sys/conf/options index 882460fbf35b..774850158221 100644 --- a/sys/conf/options +++ b/sys/conf/options @@ -1021,3 +1021,11 @@ IICHID_DEBUG opt_hid.h IICHID_SAMPLING opt_hid.h HKBD_DFLT_KEYMAP opt_hkbd.h HIDRAW_MAKE_UHID_ALIAS opt_hid.h + +# kenv options +# The early kernel environment (loader environment, config(8)-provided static) +# is typically cleared after the dynamic environment comes up to ensure that +# we're not inadvertently holding on to 'secret' values in these stale envs. +# This option is insecure except in controlled environments where the static +# environment's contents are known to be safe. +PRESERVE_EARLY_KENV opt_global.h diff --git a/sys/kern/kern_environment.c b/sys/kern/kern_environment.c index 54992e6594ed..8dc345559e95 100644 --- a/sys/kern/kern_environment.c +++ b/sys/kern/kern_environment.c @@ -365,7 +365,11 @@ init_dynamic_kenv_from(char *init_env, int *curpos) kenvp[i] = malloc(len, M_KENV, M_WAITOK); strcpy(kenvp[i++], cp); sanitize: +#ifdef PRESERVE_EARLY_KENV + continue; +#else explicit_bzero(cp, len - 1); +#endif } *curpos = i; }