From patchwork Tue Feb 15 12:40:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12747009 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 367FBC4332F for ; Tue, 15 Feb 2022 12:42:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237848AbiBOMm3 (ORCPT ); Tue, 15 Feb 2022 07:42:29 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:51638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237807AbiBOMmI (ORCPT ); Tue, 15 Feb 2022 07:42:08 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E300140D1; Tue, 15 Feb 2022 04:41:43 -0800 (PST) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Jygg61fqbz67y8P; Tue, 15 Feb 2022 20:40:50 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Tue, 15 Feb 2022 13:41:41 +0100 From: Roberto Sassu To: , , , , , , CC: , , , , , , Roberto Sassu Subject: [PATCH v2 4/6] selftests/bpf: Add test for bpf_ima_file_hash() Date: Tue, 15 Feb 2022 13:40:40 +0100 Message-ID: <20220215124042.186506-5-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220215124042.186506-1-roberto.sassu@huawei.com> References: <20220215124042.186506-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml753-chm.china.huawei.com (10.201.108.203) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Modify the existing IMA test to call bpf_ima_file_hash() and update the expected result accordingly. Signed-off-by: Roberto Sassu --- .../selftests/bpf/prog_tests/test_ima.c | 29 ++++++++++++++++--- tools/testing/selftests/bpf/progs/ima.c | 10 +++++-- 2 files changed, 33 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/test_ima.c b/tools/testing/selftests/bpf/prog_tests/test_ima.c index 97d8a6f84f4a..62bf0e830453 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_ima.c +++ b/tools/testing/selftests/bpf/prog_tests/test_ima.c @@ -13,9 +13,10 @@ #include "ima.skel.h" -static int run_measured_process(const char *measured_dir, u32 *monitored_pid) +static int run_measured_process(const char *measured_dir, u32 *monitored_pid, + bool *use_ima_file_hash) { - int child_pid, child_status; + int err, child_pid, child_status; child_pid = fork(); if (child_pid == 0) { @@ -24,6 +25,21 @@ static int run_measured_process(const char *measured_dir, u32 *monitored_pid) NULL); exit(errno); + } else if (child_pid > 0) { + waitpid(child_pid, &child_status, 0); + err = WEXITSTATUS(child_status); + if (err) + return err; + } + + child_pid = fork(); + if (child_pid == 0) { + *monitored_pid = getpid(); + *use_ima_file_hash = true; + execlp("./ima_setup.sh", "./ima_setup.sh", "run", measured_dir, + NULL); + exit(errno); + } else if (child_pid > 0) { waitpid(child_pid, &child_status, 0); return WEXITSTATUS(child_status); @@ -72,12 +88,17 @@ void test_test_ima(void) if (CHECK(err, "failed to run command", "%s, errno = %d\n", cmd, errno)) goto close_clean; - err = run_measured_process(measured_dir, &skel->bss->monitored_pid); + err = run_measured_process(measured_dir, &skel->bss->monitored_pid, + &skel->bss->use_ima_file_hash); if (CHECK(err, "run_measured_process", "err = %d\n", err)) goto close_clean; err = ring_buffer__consume(ringbuf); - ASSERT_EQ(err, 1, "num_samples_or_err"); + /* + * 1 sample with use_ima_file_hash = false + * 2 samples with use_ima_file_hash = true (./ima_setup.sh, /bin/true) + */ + ASSERT_EQ(err, 3, "num_samples_or_err"); ASSERT_NEQ(ima_hash_from_bpf, 0, "ima_hash"); close_clean: diff --git a/tools/testing/selftests/bpf/progs/ima.c b/tools/testing/selftests/bpf/progs/ima.c index 96060ff4ffc6..9bb63f96cfc0 100644 --- a/tools/testing/selftests/bpf/progs/ima.c +++ b/tools/testing/selftests/bpf/progs/ima.c @@ -18,6 +18,8 @@ struct { char _license[] SEC("license") = "GPL"; +bool use_ima_file_hash; + SEC("lsm.s/bprm_committed_creds") void BPF_PROG(ima, struct linux_binprm *bprm) { @@ -28,8 +30,12 @@ void BPF_PROG(ima, struct linux_binprm *bprm) pid = bpf_get_current_pid_tgid() >> 32; if (pid == monitored_pid) { - ret = bpf_ima_inode_hash(bprm->file->f_inode, &ima_hash, - sizeof(ima_hash)); + if (!use_ima_file_hash) + ret = bpf_ima_inode_hash(bprm->file->f_inode, &ima_hash, + sizeof(ima_hash)); + else + ret = bpf_ima_file_hash(bprm->file, &ima_hash, + sizeof(ima_hash)); if (ret < 0 || ima_hash == 0) return;