From patchwork Mon Jun 29 20:08:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Eric W. Biederman" X-Patchwork-Id: 11632103 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B644C913 for ; Mon, 29 Jun 2020 20:13:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A81C9206A1 for ; Mon, 29 Jun 2020 20:13:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731467AbgF2UNR (ORCPT ); Mon, 29 Jun 2020 16:13:17 -0400 Received: from out03.mta.xmission.com ([166.70.13.233]:41870 "EHLO out03.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731185AbgF2UNQ (ORCPT ); Mon, 29 Jun 2020 16:13:16 -0400 Received: from in02.mta.xmission.com ([166.70.13.52]) by out03.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jq09N-0006mI-1L; Mon, 29 Jun 2020 14:13:09 -0600 Received: from ip68-227-160-95.om.om.cox.net ([68.227.160.95] helo=x220.xmission.com) by in02.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.87) (envelope-from ) id 1jq09M-0004y7-3b; Mon, 29 Jun 2020 14:13:08 -0600 From: ebiederm@xmission.com (Eric W. Biederman) To: Cc: David Miller , Greg Kroah-Hartman , Tetsuo Handa , Alexei Starovoitov , Kees Cook , Andrew Morton , Alexei Starovoitov , Al Viro , bpf , linux-fsdevel , Daniel Borkmann , Jakub Kicinski , Masahiro Yamada , Gary Lin , Bruno Meneguele , LSM List , Casey Schaufler , Luis Chamberlain , Linus Torvalds References: <20200625095725.GA3303921@kroah.com> <778297d2-512a-8361-cf05-42d9379e6977@i-love.sakura.ne.jp> <20200625120725.GA3493334@kroah.com> <20200625.123437.2219826613137938086.davem@davemloft.net> <87pn9mgfc2.fsf_-_@x220.int.ebiederm.org> <87y2oac50p.fsf@x220.int.ebiederm.org> <87bll17ili.fsf_-_@x220.int.ebiederm.org> Date: Mon, 29 Jun 2020 15:08:36 -0500 In-Reply-To: <87bll17ili.fsf_-_@x220.int.ebiederm.org> (Eric W. Biederman's message of "Mon, 29 Jun 2020 14:55:05 -0500") Message-ID: <87sged3a9n.fsf_-_@x220.int.ebiederm.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 X-XM-SPF: eid=1jq09M-0004y7-3b;;;mid=<87sged3a9n.fsf_-_@x220.int.ebiederm.org>;;;hst=in02.mta.xmission.com;;;ip=68.227.160.95;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1+cqHAFjSvF5nxXSqbZnPcbIo/0ve3+EU8= X-SA-Exim-Connect-IP: 68.227.160.95 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on sa06.xmission.com X-Spam-Level: X-Spam-Status: No, score=-0.2 required=8.0 tests=ALL_TRUSTED,BAYES_50, DCC_CHECK_NEGATIVE,T_TooManySym_01 autolearn=disabled version=3.4.2 X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.8 BAYES_50 BODY: Bayes spam probability is 40 to 60% * [score: 0.4996] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa06 0; Body=1 Fuz1=1 Fuz2=1] * 0.0 T_TooManySym_01 4+ unique symbols in subject X-Spam-DCC: ; sa06 0; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ; X-Spam-Relay-Country: X-Spam-Timing: total 558 ms - load_scoreonly_sql: 0.05 (0.0%), signal_user_changed: 10 (1.8%), b_tie_ro: 9 (1.6%), parse: 1.37 (0.2%), extract_message_metadata: 17 (3.0%), get_uri_detail_list: 1.65 (0.3%), tests_pri_-1000: 20 (3.6%), tests_pri_-950: 1.80 (0.3%), tests_pri_-900: 1.44 (0.3%), tests_pri_-90: 214 (38.4%), check_bayes: 212 (38.0%), b_tokenize: 13 (2.4%), b_tok_get_all: 8 (1.4%), b_comp_prob: 3.2 (0.6%), b_tok_touch_all: 184 (33.0%), b_finish: 1.01 (0.2%), tests_pri_0: 279 (50.0%), check_dkim_signature: 0.55 (0.1%), check_dkim_adsp: 2.2 (0.4%), poll_dns_idle: 0.58 (0.1%), tests_pri_10: 2.2 (0.4%), tests_pri_500: 6 (1.1%), rewrite_mail: 0.00 (0.0%) Subject: [PATCH v2 15/15] umd: Stop using split_argv X-Spam-Flag: No X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: There is exactly one argument so there is nothing to split. All split_argv does now is cause confusion and avoid the need for a cast when passing a "const char *" string to call_usermodehelper_setup. So avoid confusion and the possibility of an odd driver name causing problems by just using a fixed argv array with a cast in the call to call_usermodehelper_setup. Signed-off-by: "Eric W. Biederman" --- kernel/umd.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/kernel/umd.c b/kernel/umd.c index 4188b71de267..ff79fb16d738 100644 --- a/kernel/umd.c +++ b/kernel/umd.c @@ -160,27 +160,21 @@ static void umd_cleanup(struct subprocess_info *info) int fork_usermode_driver(struct umd_info *info) { struct subprocess_info *sub_info; - char **argv = NULL; + const char *argv[] = { info->driver_name, NULL }; int err; if (WARN_ON_ONCE(info->tgid)) return -EBUSY; err = -ENOMEM; - argv = argv_split(GFP_KERNEL, info->driver_name, NULL); - if (!argv) - goto out; - - sub_info = call_usermodehelper_setup(info->driver_name, argv, NULL, - GFP_KERNEL, + sub_info = call_usermodehelper_setup(info->driver_name, + (char **)argv, NULL, GFP_KERNEL, umd_setup, umd_cleanup, info); if (!sub_info) goto out; err = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC); out: - if (argv) - argv_free(argv); return err; } EXPORT_SYMBOL_GPL(fork_usermode_driver);