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Message-ID: <a0fb8d9a-ae4d-4fc0-a921-efaa180e1bd7@collabora.com>
Date: Wed, 21 Feb 2024 19:06:05 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>, Eduard Zingerman
<eddyz87@...il.com>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>,
Shuah Khan <shuah@...nel.org>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>, kernel@...labora.com,
linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v2] selftests/bpf: Move test_dev_cgroup to
prog_tests
On 2/21/24 2:22 PM, Muhammad Usama Anjum wrote:
> Move test_dev_cgroup.c to prog_tests/dev_cgroup.c to be able to run it
> with test_progs. Replace dev_cgroup.bpf.o with skel header file,
> dev_cgroup.skel.h and load program from it accourdingly.
>
> ./test_progs -t test_dev_cgroup
> mknod: /tmp/test_dev_cgroup_null: Operation not permitted
> 64+0 records in
> 64+0 records out
> 32768 bytes (33 kB, 32 KiB) copied, 0.000856684 s, 38.2 MB/s
> dd: failed to open '/dev/full': Operation not permitted
> dd: failed to open '/dev/random': Operation not permitted
> #365 test_dev_cgroup:OK
> Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
>
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
> I've tested the patch with vmtest.sh on bpf-next/for-next and linux
> next. It is passing on both. Not sure why it was failed on BPFCI.
> Test run with vmtest.h:
> sudo LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh ./test_progs -t dev_cgroup
> ./test_progs -t dev_cgroup
> mknod: /tmp/test_dev_cgroup_null: Operation not permitted
> 64+0 records in
> 64+0 records out
> 32768 bytes (33 kB, 32 KiB) copied, 0.000403432 s, 81.2 MB/s
> dd: failed to open '/dev/full': Operation not permitted
> dd: failed to open '/dev/random': Operation not permitted
> #69 dev_cgroup:OK
> Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
Locally this test passes, but fails on BPFCI:
https://github.com/kernel-patches/bpf/actions/runs/7986809998/job/21808178301#step:5:9744
>
> Changes since v1:
> - Rename file from test_dev_cgroup.c to dev_cgroup.c
> - Use ASSERT_* in-place of CHECK
> ---
> .../selftests/bpf/prog_tests/dev_cgroup.c | 58 +++++++++++++
> tools/testing/selftests/bpf/test_dev_cgroup.c | 85 -------------------
> 2 files changed, 58 insertions(+), 85 deletions(-)
> create mode 100644 tools/testing/selftests/bpf/prog_tests/dev_cgroup.c
> delete mode 100644 tools/testing/selftests/bpf/test_dev_cgroup.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/dev_cgroup.c b/tools/testing/selftests/bpf/prog_tests/dev_cgroup.c
> new file mode 100644
> index 0000000000000..980b015a116ff
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/dev_cgroup.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2017 Facebook
> + */
> +
> +#include <test_progs.h>
> +#include <time.h>
> +#include "cgroup_helpers.h"
> +#include "dev_cgroup.skel.h"
> +
> +#define TEST_CGROUP "/test-bpf-based-device-cgroup/"
> +
> +void test_dev_cgroup(void)
> +{
> + struct dev_cgroup *skel;
> + int cgroup_fd, err;
> + __u32 prog_cnt;
> +
> + skel = dev_cgroup__open_and_load();
> + if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
> + goto cleanup;
> +
> + cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
> + if (!ASSERT_GT(cgroup_fd, 0, "cgroup_setup_and_join"))
> + goto cleanup;
> +
> + err = bpf_prog_attach(bpf_program__fd(skel->progs.bpf_prog1), cgroup_fd,
> + BPF_CGROUP_DEVICE, 0);
> + if (!ASSERT_EQ(err, 0, "bpf_attach"))
> + goto cleanup;
> +
> + err = bpf_prog_query(cgroup_fd, BPF_CGROUP_DEVICE, 0, NULL, NULL, &prog_cnt);
> + if (!ASSERT_EQ(err, 0, "bpf_query") || (!ASSERT_EQ(prog_cnt, 1, "bpf_query")))
> + goto cleanup;
> +
> + /* All operations with /dev/zero and /dev/urandom are allowed,
> + * everything else is forbidden.
> + */
> + ASSERT_EQ(system("rm -f /tmp/test_dev_cgroup_null"), 0, "rm");
> + ASSERT_NEQ(system("mknod /tmp/test_dev_cgroup_null c 1 3"), 0, "mknod");
> + ASSERT_EQ(system("rm -f /tmp/test_dev_cgroup_null"), 0, "rm");
> +
> + /* /dev/zero is whitelisted */
> + ASSERT_EQ(system("rm -f /tmp/test_dev_cgroup_zero"), 0, "rm");
> + ASSERT_EQ(system("mknod /tmp/test_dev_cgroup_zero c 1 5"), 0, "mknod");
Access to major number 1 and minor number 5 is allowed. The return code of
0 is expected, but on CI we are getting 256 which indicates error. mknod
help page mentions the same:
> An exit status of zero indicates success, and a nonzero value indicates
failure.
> + ASSERT_EQ(system("rm -f /tmp/test_dev_cgroup_zero"), 0, "rm");
> +
> + ASSERT_EQ(system("dd if=/dev/urandom of=/dev/zero count=64"), 0, "dd");
> +
> + /* src is allowed, target is forbidden */
> + ASSERT_NEQ(system("dd if=/dev/urandom of=/dev/full count=64"), 0, "dd");
> +
> + /* src is forbidden, target is allowed */
> + ASSERT_NEQ(system("dd if=/dev/random of=/dev/zero count=64"), 0, "dd");
> +
> +cleanup:
> + cleanup_cgroup_environment();
> + dev_cgroup__destroy(skel);
> +}
> 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 adeaf63cb6fa3..0000000000000
> --- 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 <stdio.h>
> -#include <stdlib.h>
> -#include <string.h>
> -#include <errno.h>
> -#include <assert.h>
> -#include <sys/time.h>
> -
> -#include <linux/bpf.h>
> -#include <bpf/bpf.h>
> -#include <bpf/libbpf.h>
> -
> -#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/zero and 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("rm -f /tmp/test_dev_cgroup_zero") == 0);
> -
> - assert(system("dd if=/dev/urandom of=/dev/zero 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"));
> -
> - error = 0;
> - printf("test_dev_cgroup:PASS\n");
> -
> -err:
> - cleanup_cgroup_environment();
> -
> -out:
> - return error;
> -}
--
BR,
Muhammad Usama Anjum
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