From patchwork Thu Jul 25 13:51:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9?= X-Patchwork-Id: 13741961 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 039EC19B3D6; Thu, 25 Jul 2024 13:52:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.200 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721915555; cv=none; b=D4dyQcYuggnf1SDnGZ6qCmdzvqgVyD0BxN56UKS3iimxWeL0ikl7eYbENTMwnORTcooKL09VrF31RmxKAi3A7hJnaPyUpS+HHQGoVbJue9H/3Eb9Xw4NW3L/dSOXbxLLR4nDn9t72eb3SWDvigsH4ERybtVFeJJgg2lBrjFWQh8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721915555; c=relaxed/simple; bh=bFng46TywWA1qcwiXCQr+6wwB4FqtiDuuvEwXl3opRU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=mTi8NJU2XMIZJP54G9+bo5WHGFscfVVBoAeLaLoPRNSDrve4KDxICe8kNbiZZvecSupxtwY7zg8KIdMspONjZ7Aucd0PzrrVfcuAmj3nK1wX9Enfn9+JTxfZKw5VDiYkXGTtBkvg8Lqy4HkCAo3rDIxgh5dSjgHX5ZVyqOf+grU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=ECZ/GG7+; arc=none smtp.client-ip=217.70.183.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="ECZ/GG7+" Received: by mail.gandi.net (Postfix) with ESMTPSA id 9FAE520005; Thu, 25 Jul 2024 13:52:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1721915551; h=from:from: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; bh=hnKLsdQUhtO0HXqkcJaopxOibAnUmKmSBAHLuOVe3/0=; b=ECZ/GG7+ex4qJKBrkUY4liyV/BpXMZEb220ZTcJLE/nzrhxldtuy/jWn1N1ITqpPPFYdQW bmxizjkgopXFxjYsw9CcaTLRMYywE0tLfGdYTYwBLiVIlMxuNQMNhlPxYgV158jduSwHz7 E6FS4eAdv3si0sI6B7eilC9po2N3mrSYF8VJs6A6SAD0rJBM/seaZDYyj8kYiQzPonlro0 5qEG/1qakf2M5tkA3zGXFejlVVxa9a5hqpsecJ1cru+nkM/Qopjvo/WzpXiKLia5LMat9w AUoeUs2sH4IDZuxTZHF9qVRdGABVebwvwOvIEy3ILKqgN9RQFqffs9+rbGRoTg== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Thu, 25 Jul 2024 15:51:09 +0200 Subject: [PATCH 1/3] selftests/bpf: do not disable /dev/null device access in cgroup dev test Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240725-convert_dev_cgroup-v1-1-2c8cbd487c44@bootlin.com> References: <20240725-convert_dev_cgroup-v1-0-2c8cbd487c44@bootlin.com> In-Reply-To: <20240725-convert_dev_cgroup-v1-0-2c8cbd487c44@bootlin.com> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?A?= =?utf-8?q?lexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Mailer: b4 0.13.0 X-GND-Sasl: alexis.lothore@bootlin.com test_dev_cgroup currently loads a small bpf program allowing any access on urandom and zero devices, disabling access to any other device. It makes migrating this test to test_progs impossible, since this one manipulates extensively /dev/null. Allow /dev/null manipulation in dev_cgroup program to make its usage in test_progs framework possible. Update test_dev_cgroup.c as well to match this change while it has not been removed. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- tools/testing/selftests/bpf/progs/dev_cgroup.c | 4 ++-- tools/testing/selftests/bpf/test_dev_cgroup.c | 18 +++++++++--------- 2 files changed, 11 insertions(+), 11 deletions(-) diff --git a/tools/testing/selftests/bpf/progs/dev_cgroup.c b/tools/testing/selftests/bpf/progs/dev_cgroup.c index 79b54a4fa244..c1dfbd2b56fc 100644 --- a/tools/testing/selftests/bpf/progs/dev_cgroup.c +++ b/tools/testing/selftests/bpf/progs/dev_cgroup.c @@ -41,14 +41,14 @@ int bpf_prog1(struct bpf_cgroup_dev_ctx *ctx) bpf_trace_printk(fmt, sizeof(fmt), ctx->major, ctx->minor); #endif - /* Allow access to /dev/zero and /dev/random. + /* Allow access to /dev/null and /dev/urandom. * Forbid everything else. */ if (ctx->major != 1 || type != BPF_DEVCG_DEV_CHAR) return 0; switch (ctx->minor) { - case 5: /* 1:5 /dev/zero */ + case 3: /* 1:3 /dev/null */ case 9: /* 1:9 /dev/urandom */ return 1; } diff --git a/tools/testing/selftests/bpf/test_dev_cgroup.c b/tools/testing/selftests/bpf/test_dev_cgroup.c index adeaf63cb6fa..33f544f0005a 100644 --- a/tools/testing/selftests/bpf/test_dev_cgroup.c +++ b/tools/testing/selftests/bpf/test_dev_cgroup.c @@ -54,25 +54,25 @@ int main(int argc, char **argv) goto err; } - /* All operations with /dev/zero and and /dev/urandom are allowed, + /* All operations with /dev/null and /dev/urandom are allowed, * everything else is forbidden. */ - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - assert(system("mknod /tmp/test_dev_cgroup_null c 1 3")); - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - - /* /dev/zero is whitelisted */ assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5") == 0); + assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5")); assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("dd if=/dev/urandom of=/dev/zero count=64") == 0); + /* /dev/null is whitelisted */ + assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); + assert(system("mknod /tmp/test_dev_cgroup_null c 1 3") == 0); + assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); + + assert(system("dd if=/dev/urandom of=/dev/null count=64") == 0); /* src is allowed, target is forbidden */ assert(system("dd if=/dev/urandom of=/dev/full count=64")); /* src is forbidden, target is allowed */ - assert(system("dd if=/dev/random of=/dev/zero count=64")); + assert(system("dd if=/dev/random of=/dev/null count=64")); error = 0; printf("test_dev_cgroup:PASS\n"); From patchwork Thu Jul 25 13:51:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9?= X-Patchwork-Id: 13741962 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7260419B3F9; Thu, 25 Jul 2024 13:52:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.200 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721915557; cv=none; b=th2OynhxEu1rrlyLBGkiG88vnraLn8yZGjAk+SBw4aIucB8npe4TEi0w9KnMqtIntoCaymUxeAnmQ2U3+IxBF3S1m7ZHJiegbVIfdRRp36gn/y4/5A5pU4DsULu2BZQbckK9QC9TI9Acve/fPRin6b9D6wCd/pwgTiyBRCvmy8k= ARC-Message-Signature: i=1; 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Thu, 25 Jul 2024 13:52:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1721915552; h=from:from: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; bh=IQ83ztEGoqsWGcCUKuX+N4cmCcu3i0ntpa9PAB9DADs=; b=lKMWRAZyta/sR0DVSmVIWottkPRSMUKiaoly6IwIPFNNAVap+scIb1fRiKzMq+e81m4izl 3GTUCUSqOAJohedC792yMHLvSH84f/+LIdSeQ82mLO4aLAPjETnR/PQmE/ktxDN8d8/Tg1 nRjTfX+WTqAU1iv9z5rBCnLQnXeXQ0d1QaEYzO5v83LOmWhIE5cKyhr2LXs/iuMXjfjkcs oC4lUT0QQslndRSiQC7UVbM3gPGfULF2Mhs/3jC6ZqkkUagAQZ1BZImaFNmiErwmkFXCOe 6tWwcGT/E6AxmmPUmVNEInbzNrKF9ZFIDvGfd2JU26pEqbVXreHYT0kYCX8wAw== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Thu, 25 Jul 2024 15:51:10 +0200 Subject: [PATCH 2/3] selftests/bpf: convert test_dev_cgroup to test_progs Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240725-convert_dev_cgroup-v1-2-2c8cbd487c44@bootlin.com> References: <20240725-convert_dev_cgroup-v1-0-2c8cbd487c44@bootlin.com> In-Reply-To: <20240725-convert_dev_cgroup-v1-0-2c8cbd487c44@bootlin.com> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?A?= =?utf-8?q?lexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Mailer: b4 0.13.0 X-GND-Sasl: alexis.lothore@bootlin.com test_dev_cgroup is defined as a standalone test program, and so is not executed in CI. Convert it to test_progs framework so it is tested automatically in CI, and remove the old test. In order to be able to run it in test_progs, /dev/null must remain usable, so change the new test to test operations on devices 1:3 as valid, and operations on devices 1:5 (/dev/zero) as invalid. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- tools/testing/selftests/bpf/.gitignore | 1 - tools/testing/selftests/bpf/Makefile | 2 - .../testing/selftests/bpf/prog_tests/cgroup_dev.c | 120 +++++++++++++++++++++ tools/testing/selftests/bpf/test_dev_cgroup.c | 85 --------------- 4 files changed, 120 insertions(+), 88 deletions(-) diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore index 4e4aae8aa7ec..8f14d8faeb0b 100644 --- a/tools/testing/selftests/bpf/.gitignore +++ b/tools/testing/selftests/bpf/.gitignore @@ -9,7 +9,6 @@ test_lpm_map test_tag FEATURE-DUMP.libbpf fixdep -test_dev_cgroup /test_progs /test_progs-no_alu32 /test_progs-bpf_gcc diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index aeada478e37a..2a9ba2246f80 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -69,7 +69,6 @@ endif # Order correspond to 'make run_tests' order TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \ - test_dev_cgroup \ test_sock test_sockmap get_cgroup_id_user \ test_cgroup_storage \ test_tcpnotify_user test_sysctl \ @@ -295,7 +294,6 @@ JSON_WRITER := $(OUTPUT)/json_writer.o CAP_HELPERS := $(OUTPUT)/cap_helpers.o NETWORK_HELPERS := $(OUTPUT)/network_helpers.o -$(OUTPUT)/test_dev_cgroup: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS) diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c new file mode 100644 index 000000000000..5112b99213ad --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include "test_progs.h" +#include "cgroup_helpers.h" +#include "dev_cgroup.skel.h" + +#define TEST_CGROUP "/test-bpf-based-device-cgroup/" +#define TEST_BUFFER_SIZE 64 + +static void test_mknod(const char *path, mode_t mode, int dev_major, + int dev_minor, int should_fail) +{ + int ret; + + unlink(path); + ret = mknod(path, mode, makedev(dev_major, dev_minor)); + if (should_fail) + ASSERT_ERR(ret, "mknod"); + else + ASSERT_OK(ret, "mknod"); + unlink(path); +} + +static void test_read(const char *path, int should_fail) +{ + char buf[TEST_BUFFER_SIZE]; + int ret, fd; + + fd = open(path, O_RDONLY); + + /* A bare open on unauthorized device should fail */ + if (should_fail) { + ASSERT_ERR(fd, "open file for read"); + if (fd) + close(fd); + return; + } + + if (!ASSERT_OK_FD(fd, "open file for read")) + return; + + ret = read(fd, buf, TEST_BUFFER_SIZE); + if (should_fail) + ASSERT_ERR(ret, "read"); + else + ASSERT_EQ(ret, TEST_BUFFER_SIZE, "read"); + + close(fd); +} + +static void test_write(const char *path, int should_fail) +{ + char buf[] = "some random test data"; + int ret, fd; + + fd = open(path, O_WRONLY); + + /* A bare open on unauthorized device should fail */ + if (should_fail) { + ASSERT_ERR(fd, "open file for write"); + if (fd) + close(fd); + return; + } + + if (!ASSERT_OK_FD(fd, "open file for write")) + return; + + ret = write(fd, buf, sizeof(buf)); + if (should_fail) + ASSERT_ERR(ret, "write"); + else + ASSERT_EQ(ret, sizeof(buf), "write"); + + close(fd); +} + +void test_cgroup_dev(void) +{ + struct dev_cgroup *skel; + int cgroup_fd; + + cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); + if (!ASSERT_OK_FD(cgroup_fd, "cgroup switch")) + return; + + skel = dev_cgroup__open_and_load(); + if (!ASSERT_OK_PTR(skel, "load program")) + goto cleanup_cgroup; + + if (!ASSERT_OK(bpf_prog_attach(bpf_program__fd(skel->progs.bpf_prog1), + cgroup_fd, BPF_CGROUP_DEVICE, 0), + "attach_program")) + goto cleanup_progs; + + if (test__start_subtest("deny-mknod")) + test_mknod("/dev/test_dev_cgroup_zero", S_IFCHR, 1, 5, 1); + + if (test__start_subtest("allow-mknod")) + test_mknod("/dev/test_dev_cgroup_null", S_IFCHR, 1, 3, 0); + + if (test__start_subtest("allow-read")) + test_read("/dev/urandom", 0); + + if (test__start_subtest("allow-write")) + test_write("/dev/null", 0); + + if (test__start_subtest("deny-read")) + test_read("/dev/random", 1); + + if (test__start_subtest("deny-write")) + test_write("/dev/zero", 1); + +cleanup_progs: + dev_cgroup__destroy(skel); +cleanup_cgroup: + cleanup_cgroup_environment(); +} diff --git a/tools/testing/selftests/bpf/test_dev_cgroup.c b/tools/testing/selftests/bpf/test_dev_cgroup.c deleted file mode 100644 index 33f544f0005a..000000000000 --- a/tools/testing/selftests/bpf/test_dev_cgroup.c +++ /dev/null @@ -1,85 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* Copyright (c) 2017 Facebook - */ - -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -#include "cgroup_helpers.h" -#include "testing_helpers.h" - -#define DEV_CGROUP_PROG "./dev_cgroup.bpf.o" - -#define TEST_CGROUP "/test-bpf-based-device-cgroup/" - -int main(int argc, char **argv) -{ - struct bpf_object *obj; - int error = EXIT_FAILURE; - int prog_fd, cgroup_fd; - __u32 prog_cnt; - - /* Use libbpf 1.0 API mode */ - libbpf_set_strict_mode(LIBBPF_STRICT_ALL); - - if (bpf_prog_test_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE, - &obj, &prog_fd)) { - printf("Failed to load DEV_CGROUP program\n"); - goto out; - } - - cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); - if (cgroup_fd < 0) { - printf("Failed to create test cgroup\n"); - goto out; - } - - /* Attach bpf program */ - if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_DEVICE, 0)) { - printf("Failed to attach DEV_CGROUP program"); - goto err; - } - - if (bpf_prog_query(cgroup_fd, BPF_CGROUP_DEVICE, 0, NULL, NULL, - &prog_cnt)) { - printf("Failed to query attached programs"); - goto err; - } - - /* All operations with /dev/null and /dev/urandom are allowed, - * everything else is forbidden. - */ - assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5")); - assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - - /* /dev/null is whitelisted */ - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - assert(system("mknod /tmp/test_dev_cgroup_null c 1 3") == 0); - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - - assert(system("dd if=/dev/urandom of=/dev/null count=64") == 0); 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spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="k/o2ryKA" Received: by mail.gandi.net (Postfix) with ESMTPSA id A9D822000B; Thu, 25 Jul 2024 13:52:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1721915553; h=from:from: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; bh=82Al0sPEZdS4t7rN57VPIR42+MxT3sjYqEuVz/Qs2Xc=; b=k/o2ryKAmKDcaGvTD+5k8DYKdLqF58lv32hu5Nl5xm4TtQPFad+kszn5JoXfpjYtMtIKqM RMebd23Prd1+HvBMukIm+/busPZU3MHpRNW2yKgoVFAD7zHtNxIKpfJif56gWd0GhlooO2 87l8OL40bSkVPhYbqPqXSJZPmkyV4sPsFSlOqR41gvo/Rnb3Wfr3VfYmzUI+nE68jBPMGA GOtY3UZ89MNgMT7BQ86Loq7yEczv5qanofS/p6davYTlJT4FEB8sjX7Xm3NYjbcrvT0xhH MIyd4HWx+d+x2jLqNE4FADzV0wxxTkoYRzLbgChQNTEaN7jlKeiPuSwKjIrm0g== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Thu, 25 Jul 2024 15:51:11 +0200 Subject: [PATCH 3/3] selftests/bpf: add wrong type test to cgroup dev Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240725-convert_dev_cgroup-v1-3-2c8cbd487c44@bootlin.com> References: <20240725-convert_dev_cgroup-v1-0-2c8cbd487c44@bootlin.com> In-Reply-To: <20240725-convert_dev_cgroup-v1-0-2c8cbd487c44@bootlin.com> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?A?= =?utf-8?q?lexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Mailer: b4 0.13.0 X-GND-Sasl: alexis.lothore@bootlin.com Current cgroup_dev test mostly tests that device operation is accepted or refused base on passed major/minor (and so, any operation performed during test involves only char device) Add a small subtest ensuring that the device type passed to bpf program allows it to take decisions as well. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- tools/testing/selftests/bpf/prog_tests/cgroup_dev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c index 5112b99213ad..f0b6e5d9604b 100644 --- a/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c @@ -101,6 +101,9 @@ void test_cgroup_dev(void) if (test__start_subtest("allow-mknod")) test_mknod("/dev/test_dev_cgroup_null", S_IFCHR, 1, 3, 0); + if (test__start_subtest("deny-mknod-wrong-type")) + test_mknod("/dev/test_dev_cgroup_null_block", S_IFBLK, 1, 3, 1); + if (test__start_subtest("allow-read")) test_read("/dev/urandom", 0);