From patchwork Tue Dec 13 23:36:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Marzinski X-Patchwork-Id: 13072578 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A211EC4332F for ; Tue, 13 Dec 2022 23:36:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670974586; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=YBBsydTQsElHmqOulJBLLiFEubpnJsvhm/Tib+stcpg=; b=ZaMzTxmRTHB6nlhDM51ABYQV5cPOPRXwrF0yQluWF8/aTWvon3PiQsw/CVPTonyIkv7LWc p41+iGaWxXG+kOyB6UtYD8KKL4uKH8i3L23bwnQ65R2i6LMMf//xmi08elMVsO9VX8RdN6 Md5ezQgbh2lCxTkcWSGM2Y7fqOcVNeE= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-459-hSRfcdmXM2Kq33iSSFEmzg-1; Tue, 13 Dec 2022 18:36:25 -0500 X-MC-Unique: hSRfcdmXM2Kq33iSSFEmzg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id F0A15381494A; Tue, 13 Dec 2022 23:36:22 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com [10.30.29.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id DFAE82026D76; Tue, 13 Dec 2022 23:36:22 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (localhost [IPv6:::1]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 1DBAC1946A6C; Tue, 13 Dec 2022 23:36:20 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 8F4131946A46 for ; Tue, 13 Dec 2022 23:36:14 +0000 (UTC) Received: by smtp.corp.redhat.com (Postfix) id 6622F4085720; Tue, 13 Dec 2022 23:36:14 +0000 (UTC) Received: from octiron.msp.redhat.com (octiron.msp.redhat.com [10.15.80.209]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4817B4085722; Tue, 13 Dec 2022 23:36:14 +0000 (UTC) Received: from octiron.msp.redhat.com (localhost.localdomain [127.0.0.1]) by octiron.msp.redhat.com (8.14.9/8.14.9) with ESMTP id 2BDNaCVx008056; Tue, 13 Dec 2022 17:36:13 -0600 Received: (from bmarzins@localhost) by octiron.msp.redhat.com (8.14.9/8.14.9/Submit) id 2BDNaC2O008055; Tue, 13 Dec 2022 17:36:12 -0600 From: Benjamin Marzinski To: Christophe Varoqui Date: Tue, 13 Dec 2022 17:36:07 -0600 Message-Id: <1670974567-8005-4-git-send-email-bmarzins@redhat.com> In-Reply-To: <1670974567-8005-1-git-send-email-bmarzins@redhat.com> References: <1670974567-8005-1-git-send-email-bmarzins@redhat.com> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Subject: [dm-devel] [PATCH 3/3] libmutipath: validate the argument count of config strings X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: device-mapper development , Martin Wilck MIME-Version: 1.0 Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com The features, path_selector, and hardware_handler config options pass their strings directly into the kernel. If users omit the argument counts from these strings, or use the wrong value, the kernel's table parsing gets completely messed up, and the error messages it prints don't reflect what actully went wrong. To avoid messing up the kernel table parsing, verify that these strings correctly set the argument count to the number of arguments they have. Signed-off-by: Benjamin Marzinski --- libmultipath/dict.c | 110 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 101 insertions(+), 9 deletions(-) diff --git a/libmultipath/dict.c b/libmultipath/dict.c index f4233882..6645de49 100644 --- a/libmultipath/dict.c +++ b/libmultipath/dict.c @@ -116,6 +116,58 @@ set_str(vector strvec, void *ptr, const char *file, int line_nr) return 0; } +static int +set_arg_str(vector strvec, void *ptr, int count_idx, const char *file, + int line_nr) +{ + char **str_ptr = (char **)ptr; + char *old_str = *str_ptr; + const char *spaces = " \f\n\r\t\v"; + char *p, *end; + int idx = -1; + long int count = -1; + + *str_ptr = set_value(strvec); + if (!*str_ptr) { + free(old_str); + return 1; + } + p = *str_ptr; + while (*p != '\0') { + p += strspn(p, spaces); + if (*p == '\0') + break; + idx += 1; + if (idx == count_idx) { + errno = 0; + count = strtol(p, &end, 10); + if (errno == ERANGE || end == p || + !(isspace(*end) || *end == '\0')) { + count = -1; + break; + } + } + p += strcspn(p, spaces); + } + if (count < 0) { + condlog(1, "%s line %d, missing argument count for %s", + file, line_nr, (char*)VECTOR_SLOT(strvec, 0)); + goto fail; + } + if (count != idx - count_idx) { + condlog(1, "%s line %d, invalid argument count for %s:, got '%ld' expected '%d'", + file, line_nr, (char*)VECTOR_SLOT(strvec, 0), count, + idx - count_idx); + goto fail; + } + free(old_str); + return 0; +fail: + free(*str_ptr); + *str_ptr = old_str; + return 0; +} + static int set_path(vector strvec, void *ptr, const char *file, int line_nr) { @@ -288,6 +340,14 @@ def_ ## option ## _handler (struct config *conf, vector strvec, \ return set_int(strvec, &conf->option, minval, maxval, file, line_nr); \ } +#define declare_def_arg_str_handler(option, count_idx) \ +static int \ +def_ ## option ## _handler (struct config *conf, vector strvec, \ + const char *file, int line_nr) \ +{ \ + return set_arg_str(strvec, &conf->option, count_idx, file, line_nr); \ +} + #define declare_def_snprint(option, function) \ static int \ snprint_def_ ## option (struct config *conf, struct strbuf *buff, \ @@ -340,6 +400,17 @@ hw_ ## option ## _handler (struct config *conf, vector strvec, \ return set_int(strvec, &hwe->option, minval, maxval, file, line_nr); \ } +#define declare_hw_arg_str_handler(option, count_idx) \ +static int \ +hw_ ## option ## _handler (struct config *conf, vector strvec, \ + const char *file, int line_nr) \ +{ \ + struct hwentry * hwe = VECTOR_LAST_SLOT(conf->hwtable); \ + if (!hwe) \ + return 1; \ + return set_arg_str(strvec, &hwe->option, count_idx, file, line_nr); \ +} + #define declare_hw_snprint(option, function) \ static int \ @@ -371,6 +442,16 @@ ovr_ ## option ## _handler (struct config *conf, vector strvec, \ file, line_nr); \ } +#define declare_ovr_arg_str_handler(option, count_idx) \ +static int \ +ovr_ ## option ## _handler (struct config *conf, vector strvec, \ + const char *file, int line_nr) \ +{ \ + if (!conf->overrides) \ + return 1; \ + return set_arg_str(strvec, &conf->overrides->option, count_idx, file, line_nr); \ +} + #define declare_ovr_snprint(option, function) \ static int \ snprint_ovr_ ## option (struct config *conf, struct strbuf *buff, \ @@ -401,6 +482,17 @@ mp_ ## option ## _handler (struct config *conf, vector strvec, \ return set_int(strvec, &mpe->option, minval, maxval, file, line_nr); \ } +#define declare_mp_arg_str_handler(option, count_idx) \ +static int \ +mp_ ## option ## _handler (struct config *conf, vector strvec, \ + const char *file, int line_nr) \ +{ \ + struct mpentry * mpe = VECTOR_LAST_SLOT(conf->mptable); \ + if (!mpe) \ + return 1; \ + return set_arg_str(strvec, &mpe->option, count_idx, file, line_nr); \ +} + #define declare_mp_snprint(option, function) \ static int \ snprint_mp_ ## option (struct config *conf, struct strbuf *buff, \ @@ -584,13 +676,13 @@ snprint_def_marginal_pathgroups(struct config *conf, struct strbuf *buff, } -declare_def_handler(selector, set_str) +declare_def_arg_str_handler(selector, 1) declare_def_snprint_defstr(selector, print_str, DEFAULT_SELECTOR) -declare_hw_handler(selector, set_str) +declare_hw_arg_str_handler(selector, 1) declare_hw_snprint(selector, print_str) -declare_ovr_handler(selector, set_str) +declare_ovr_arg_str_handler(selector, 1) declare_ovr_snprint(selector, print_str) -declare_mp_handler(selector, set_str) +declare_mp_arg_str_handler(selector, 1) declare_mp_snprint(selector, print_str) static int snprint_uid_attrs(struct config *conf, struct strbuf *buff, @@ -663,13 +755,13 @@ declare_hw_snprint(prio_args, print_str) declare_mp_handler(prio_args, set_str) declare_mp_snprint(prio_args, print_str) -declare_def_handler(features, set_str) +declare_def_arg_str_handler(features, 0) declare_def_snprint_defstr(features, print_str, DEFAULT_FEATURES) -declare_ovr_handler(features, set_str) +declare_ovr_arg_str_handler(features, 0) declare_ovr_snprint(features, print_str) -declare_hw_handler(features, set_str) +declare_hw_arg_str_handler(features, 0) declare_hw_snprint(features, print_str) -declare_mp_handler(features, set_str) +declare_mp_arg_str_handler(features, 0) declare_mp_snprint(features, print_str) declare_def_handler(checker_name, set_str) @@ -1821,7 +1913,7 @@ declare_hw_snprint(revision, print_str) declare_hw_handler(bl_product, set_str) declare_hw_snprint(bl_product, print_str) -declare_hw_handler(hwhandler, set_str) +declare_hw_arg_str_handler(hwhandler, 0) declare_hw_snprint(hwhandler, print_str) /*