From nobody Fri Oct 08 06:11:04 2021 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id AE78712D4035; Fri, 8 Oct 2021 06:11:18 +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 4HQd9c53sMz3LVc; Fri, 8 Oct 2021 06:11:16 +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 6C63E21C45; Fri, 8 Oct 2021 06:11:04 +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 1986B4cc007566; Fri, 8 Oct 2021 06:11:04 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1986B4Hm007565; Fri, 8 Oct 2021 06:11:04 GMT (envelope-from git) Date: Fri, 8 Oct 2021 06:11:04 GMT Message-Id: <202110080611.1986B4Hm007565@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Kyle Evans Subject: git: 4d997b340dd7 - stable/12 - When we have a command returned by zfs_nextboot() that is longer than command in the loader.conf, the latter needs to be nul terminated, otherwise garbage trailer left from zfs_nextboot() will be passed to parse_cmd() together with loader.conf command. List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org 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/stable/12 X-Git-Reftype: branch X-Git-Commit: 4d997b340dd7ee561b2f44bbcef3c532108640e6 Auto-Submitted: auto-generated X-Spam: Yes X-ThisMailContainsUnwantedMimeParts: N The branch stable/12 has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=4d997b340dd7ee561b2f44bbcef3c532108640e6 commit 4d997b340dd7ee561b2f44bbcef3c532108640e6 Author: Gleb Smirnoff AuthorDate: 2020-08-20 20:31:47 +0000 Commit: Kyle Evans CommitDate: 2021-10-08 05:24:27 +0000 When we have a command returned by zfs_nextboot() that is longer than command in the loader.conf, the latter needs to be nul terminated, otherwise garbage trailer left from zfs_nextboot() will be passed to parse_cmd() together with loader.conf command. While here, reset cmd to empty string if read() returns error. (cherry picked from commit c7dd069c70d465298f14553d981bfe5e2ffd0459) --- stand/i386/zfsboot/zfsboot.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/stand/i386/zfsboot/zfsboot.c b/stand/i386/zfsboot/zfsboot.c index e387d4a47c9d..81a6d74abc7b 100644 --- a/stand/i386/zfsboot/zfsboot.c +++ b/stand/i386/zfsboot/zfsboot.c @@ -248,7 +248,12 @@ main(void) fd = open(PATH_DOTCONFIG, O_RDONLY); if (fd != -1) { - read(fd, cmd, sizeof (cmd)); + ssize_t cmdlen; + + if ((cmdlen = read(fd, cmd, sizeof(cmd))) > 0) + cmd[cmdlen] = '\0'; + else + *cmd = '\0'; close(fd); }