From patchwork Tue May 14 05:42:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brendan Higgins X-Patchwork-Id: 10942169 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2862D112C for ; Tue, 14 May 2019 05:46:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 14C2C285D6 for ; Tue, 14 May 2019 05:46:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 08ACE285E2; Tue, 14 May 2019 05:46:38 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 510C9285D6 for ; Tue, 14 May 2019 05:46:37 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 4776521275445; Mon, 13 May 2019 22:46:37 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=2607:f8b0:4864:20::349; helo=mail-ot1-x349.google.com; envelope-from=3o1baxa4kdd4gwjsifsmnllnsxlttlqj.htrqnsz2-s0inrrqnxyx.56.twl@flex--brendanhiggins.bounces.google.com; receiver=linux-nvdimm@lists.01.org Received: from mail-ot1-x349.google.com (mail-ot1-x349.google.com [IPv6:2607:f8b0:4864:20::349]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 356D7212746FE for ; Mon, 13 May 2019 22:46:36 -0700 (PDT) Received: by mail-ot1-x349.google.com with SMTP id f92so8617075otb.3 for ; Mon, 13 May 2019 22:46:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=4KJF+Ovjjzqhb4AXWhXMCXmyGdUTqkou6egxCpIxJUE=; b=ufJ7R09drib1DbLFKFdm88ALal8eQ8ux+QRzX6K4qlL26VFgSz0kl9tol662N7UK53 yo3Qrp2QjSiBx/HhkaXBgsflKOxtGd8pTmUvQezzILtj2Nqumr00+SgSpNoM8oSka485 w9ZCoh4EqQXa/nD5aRK57fn6Zu3Hs8FayrCme2MHguzHWErdb406LjS6joy9XRnUZc++ WROJ9HibR1vbyXc6ykmogQk5MGzot89a6Pwhc27OkXQNsmaGjzWo0+UdcaTiJuIyD9RU IqseNctGcX9vLU8RyjQ9/Fda+0FpTML6T+TOmMT523SSnNjRo7dMP9TxWVO29rB2oQWj Fjdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=4KJF+Ovjjzqhb4AXWhXMCXmyGdUTqkou6egxCpIxJUE=; b=UmbpgZsur9qDJl+1Mhea4vaS1PS4ZKe7VOssCEGdZtM5kO0JsLF7gOohiAcHEfqVh7 b00RnZaEAdPQuJ3lDeEpSBUdAkilFu4bsBxhJx5dMefSv2+wXFiVyFvy70wk7LMXZhBt cw400s3vstLcB+T4k/fqasODzH9a7JepfVlJV+KGbz0VD/7y+M19U02OBzKw+08P5fgi B/NzjTOpiuQhgw+rZXALSdNeh1fSXecRhu/Qc//QXIt4pZBVb0vykJ8JsAf4Z/G2kq7j uX41w2NsY5leDpAneFT5FBIFutNME/KZTTogy8JDvVaxmuoTdzn3x6BzMEejIQbcip9c GBFw== X-Gm-Message-State: APjAAAVwhc6ZcWfLI3hv+eODnzIK0bA34LGOFhpQkTfO67yc7hSWu8V+ 9BQ+T81cMJ3zcrFm4HbdqHr23zSxhaAsXepMKX2BHQ== X-Google-Smtp-Source: APXvYqx3JDi02P47CK8QRD5+B38yuHneb/5HzpSvk7mbXolSuJPjerG6Sls3fZCAbtPUdKvr+bfDjDg7kwlcmfISQkvyaw== X-Received: by 2002:aca:3114:: with SMTP id x20mr1922850oix.168.1557812795309; Mon, 13 May 2019 22:46:35 -0700 (PDT) Date: Mon, 13 May 2019 22:42:51 -0700 In-Reply-To: <20190514054251.186196-1-brendanhiggins@google.com> Message-Id: <20190514054251.186196-18-brendanhiggins@google.com> Mime-Version: 1.0 References: <20190514054251.186196-1-brendanhiggins@google.com> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog Subject: [PATCH v3 17/18] kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec() From: Brendan Higgins To: frowand.list@gmail.com, gregkh@linuxfoundation.org, keescook@google.com, kieran.bingham@ideasonboard.com, mcgrof@kernel.org, robh@kernel.org, sboyd@kernel.org, shuah@kernel.org, tytso@mit.edu, yamada.masahiro@socionext.com X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pmladek@suse.com, linux-doc@vger.kernel.org, amir73il@gmail.com, Brendan Higgins , dri-devel@lists.freedesktop.org, Alexander.Levin@microsoft.com, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, khilman@baylibre.com, knut.omang@oracle.com, wfg@linux.intel.com, joel@jms.id.au, rientjes@google.com, Iurii Zaikin , jdike@addtoit.com, dan.carpenter@oracle.com, devicetree@vger.kernel.org, linux-kbuild@vger.kernel.org, Tim.Bird@sony.com, linux-um@lists.infradead.org, rostedt@goodmis.org, julia.lawall@lip6.fr, kunit-dev@googlegroups.com, richard@nod.at, rdunlap@infradead.org, linux-kernel@vger.kernel.org, daniel@ffwll.ch, mpe@ellerman.id.au, linux-fsdevel@vger.kernel.org Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP From: Iurii Zaikin KUnit tests for initialized data behavior of proc_dointvec that is explicitly checked in the code. Includes basic parsing tests including int min/max overflow. Signed-off-by: Iurii Zaikin Signed-off-by: Brendan Higgins Reviewed-by: Greg Kroah-Hartman Reviewed-by: Logan Gunthorpe --- Changes Since Last Revision: - Fixed integer overflow discovered by kbuild bot. --- kernel/Makefile | 2 + kernel/sysctl-test.c | 293 +++++++++++++++++++++++++++++++++++++++++++ lib/Kconfig.debug | 6 + 3 files changed, 301 insertions(+) create mode 100644 kernel/sysctl-test.c diff --git a/kernel/Makefile b/kernel/Makefile index 6c57e78817dad..c81a8976b6a4b 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -112,6 +112,8 @@ obj-$(CONFIG_HAS_IOMEM) += iomem.o obj-$(CONFIG_ZONE_DEVICE) += memremap.o obj-$(CONFIG_RSEQ) += rseq.o +obj-$(CONFIG_SYSCTL_KUNIT_TEST) += sysctl-test.o + obj-$(CONFIG_GCC_PLUGIN_STACKLEAK) += stackleak.o KASAN_SANITIZE_stackleak.o := n KCOV_INSTRUMENT_stackleak.o := n diff --git a/kernel/sysctl-test.c b/kernel/sysctl-test.c new file mode 100644 index 0000000000000..fe0f2bae66085 --- /dev/null +++ b/kernel/sysctl-test.c @@ -0,0 +1,293 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test of proc sysctl. + */ + +#include +#include +#include +#include + +static int i_zero; +static int i_one_hundred = 100; + +struct test_sysctl_data { + int int_0001; + int int_0002; + int int_0003[4]; + + unsigned int uint_0001; + + char string_0001[65]; +}; + +static struct test_sysctl_data test_data = { + .int_0001 = 60, + .int_0002 = 1, + + .int_0003[0] = 0, + .int_0003[1] = 1, + .int_0003[2] = 2, + .int_0003[3] = 3, + + .uint_0001 = 314, + + .string_0001 = "(none)", +}; + +static void sysctl_test_dointvec_null_tbl_data(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = NULL, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + void *buffer = kunit_kzalloc(test, sizeof(int), GFP_USER); + size_t len; + loff_t pos; + + len = 1234; + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 0, buffer, &len, &pos)); + KUNIT_EXPECT_EQ(test, 0, len); + len = 1234; + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 1, buffer, &len, &pos)); + KUNIT_EXPECT_EQ(test, 0, len); +} + +static void sysctl_test_dointvec_table_maxlen_unset(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = &test_data.int_0001, + .maxlen = 0, + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + void *buffer = kunit_kzalloc(test, sizeof(int), GFP_USER); + size_t len; + loff_t pos; + + len = 1234; + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 0, buffer, &len, &pos)); + KUNIT_EXPECT_EQ(test, 0, len); + len = 1234; + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 1, buffer, &len, &pos)); + KUNIT_EXPECT_EQ(test, 0, len); +} + +static void sysctl_test_dointvec_table_len_is_zero(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = &test_data.int_0001, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + void *buffer = kunit_kzalloc(test, sizeof(int), GFP_USER); + size_t len; + loff_t pos; + + len = 0; + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 0, buffer, &len, &pos)); + KUNIT_EXPECT_EQ(test, 0, len); + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 1, buffer, &len, &pos)); + KUNIT_EXPECT_EQ(test, 0, len); +} + +static void sysctl_test_dointvec_table_read_but_position_set(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = &test_data.int_0001, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + void *buffer = kunit_kzalloc(test, sizeof(int), GFP_USER); + size_t len; + loff_t pos; + + len = 1234; + pos = 1; + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 0, buffer, &len, &pos)); + KUNIT_EXPECT_EQ(test, 0, len); +} + +static void sysctl_test_dointvec_happy_single_positive(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = &test_data.int_0001, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + char input[] = "9"; + size_t len = sizeof(input) - 1; + loff_t pos = 0; + + table.data = kunit_kzalloc(test, sizeof(int), GFP_USER); + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 1, input, &len, &pos)); + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len); + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, pos); + KUNIT_EXPECT_EQ(test, 9, *(int *)table.data); +} + +static void sysctl_test_dointvec_happy_single_negative(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = &test_data.int_0001, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + char input[] = "-9"; + size_t len = sizeof(input) - 1; + loff_t pos = 0; + + table.data = kunit_kzalloc(test, sizeof(int), GFP_USER); + KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, 1, input, &len, &pos)); + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len); + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, pos); + KUNIT_EXPECT_EQ(test, -9, *(int *)table.data); +} + +static void sysctl_test_dointvec_single_less_int_min(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = &test_data.int_0001, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + char input[32]; + size_t len = sizeof(input) - 1; + loff_t pos = 0; + unsigned long abs_of_less_than_min = (unsigned long)INT_MAX + - (INT_MAX + INT_MIN) + 1; + + KUNIT_EXPECT_LT(test, + snprintf(input, sizeof(input), "-%lu", + abs_of_less_than_min), + sizeof(input)); + + table.data = kunit_kzalloc(test, sizeof(int), GFP_USER); + KUNIT_EXPECT_EQ(test, -EINVAL, + proc_dointvec(&table, 1, input, &len, &pos)); + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len); + KUNIT_EXPECT_EQ(test, 0, *(int *)table.data); +} + +static void sysctl_test_dointvec_single_greater_int_max(struct kunit *test) +{ + struct ctl_table table = { + .procname = "foo", + .data = &test_data.int_0001, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &i_zero, + .extra2 = &i_one_hundred, + }; + char input[32]; + size_t len = sizeof(input) - 1; + loff_t pos = 0; + unsigned long greater_than_max = (unsigned long)INT_MAX + 1; + + KUNIT_EXPECT_GT(test, greater_than_max, INT_MAX); + KUNIT_EXPECT_LT(test, snprintf(input, sizeof(input), "%lu", + greater_than_max), + sizeof(input)); + table.data = kunit_kzalloc(test, sizeof(int), GFP_USER); + KUNIT_EXPECT_EQ(test, -EINVAL, + proc_dointvec(&table, 1, input, &len, &pos)); + KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len); + KUNIT_EXPECT_EQ(test, 0, *(int *)table.data); +} + +static int sysctl_test_init(struct kunit *test) +{ + return 0; +} + +/* + * This is run once after each test case, see the comment on example_test_module + * for more information. + */ +static void sysctl_test_exit(struct kunit *test) +{ +} + +/* + * Here we make a list of all the test cases we want to add to the test module + * below. + */ +static struct kunit_case sysctl_test_cases[] = { + /* + * This is a helper to create a test case object from a test case + * function; its exact function is not important to understand how to + * use KUnit, just know that this is how you associate test cases with a + * test module. + */ + KUNIT_CASE(sysctl_test_dointvec_null_tbl_data), + KUNIT_CASE(sysctl_test_dointvec_table_maxlen_unset), + KUNIT_CASE(sysctl_test_dointvec_table_len_is_zero), + KUNIT_CASE(sysctl_test_dointvec_table_read_but_position_set), + KUNIT_CASE(sysctl_test_dointvec_happy_single_positive), + KUNIT_CASE(sysctl_test_dointvec_happy_single_negative), + KUNIT_CASE(sysctl_test_dointvec_single_less_int_min), + KUNIT_CASE(sysctl_test_dointvec_single_greater_int_max), + {}, +}; + +/* + * This defines a suite or grouping of tests. + * + * Test cases are defined as belonging to the suite by adding them to + * `test_cases`. + * + * Often it is desirable to run some function which will set up things which + * will be used by every test; this is accomplished with an `init` function + * which runs before each test case is invoked. Similarly, an `exit` function + * may be specified which runs after every test case and can be used to for + * cleanup. For clarity, running tests in a test module would behave as follows: + * + * module.init(test); + * module.test_case[0](test); + * module.exit(test); + * module.init(test); + * module.test_case[1](test); + * module.exit(test); + * ...; + */ +static struct kunit_module sysctl_test_module = { + .name = "sysctl_test", + .init = sysctl_test_init, + .exit = sysctl_test_exit, + .test_cases = sysctl_test_cases, +}; + +/* + * This registers the above test module telling KUnit that this is a suite of + * tests that need to be run. + */ +module_test(sysctl_test_module); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index d5a4a4036d2f8..772af4ec70111 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1908,6 +1908,12 @@ config TEST_SYSCTL If unsure, say N. +config SYSCTL_KUNIT_TEST + bool "KUnit test for sysctl" + depends on KUNIT + help + Enables KUnit sysctl test. + config TEST_UDELAY tristate "udelay test driver" help