From patchwork Tue Aug 13 12:45:05 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: 819641 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (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 9886E1993A7; Tue, 13 Aug 2024 12:45:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723553122; cv=none; b=m9GJ/bM7JKMd/oPO4hkcbvZpoyusNto6NGs41bcwEsAJwis9IDluerjGPdzdkOr0qjH9Wo99oLFOV4R/OaKi3zOAAxQg0/5WWM8ICp975XgssuLEXd+UwvRBP/0o+9n2gNXcDK86PGcAuoR4T2tBK41Cq+QAeu/lTvaWGb9L0Bk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723553122; c=relaxed/simple; bh=MYYGYRKkXEdbsBw7LOyr3lZWyfCyuPGsB8+wqTE9em8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=iCxQtYUpoV3Yb786S+wB7tNA7CbACxR4Gnf+jcH7kALF9yAMWCj7sFiC3zKnyUbXemo2kfAG2VJGJ/JxS+M4MQkwDxb2sBd7SHzUvPrmT/30QFHI3e6EF4PIzGHyKkBaML/G5XA2a2LqOHbzTs+6FY2SGnKKfClQMPlRWEITiP0= 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=Up5llrnF; arc=none smtp.client-ip=217.70.183.198 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="Up5llrnF" Received: by mail.gandi.net (Postfix) with ESMTPSA id 02D98C0002; Tue, 13 Aug 2024 12:45:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1723553111; 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=9kGz1szDpBn/CZxvhoM0F24cwT9uH/dncdiyqqwOY0g=; b=Up5llrnFFT5KOjBYUiiW1280re1UBSeZAWtQrvojBzSQFeyjv+dvRSW9SPBSoNux9s4I79 gRHEpnEpRg87AoWMT5qosN2uURJFkpRduXH1y0weFsNv+sizjBKoXt8/7SdPjsNHZVb2ZK O9DaUo9k+QULLpkY1yQOCVvIPgad+gRQGzo1Ko+k510vhs3tvtsG6TAzHbm97S1raS0hpi viN55dn9E9WhDZaCqFuzOWKZawJczbeoBVdAjCUWVLNsTV/H/hQjIdsSNTJrWS4ydNLIir qPJZHcsa1m4ZOxn046kF/LEYBFjKFHuDTeAMaK9Bsu+QDhVvVTptb++nocnJwA== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Tue, 13 Aug 2024 14:45:05 +0200 Subject: [PATCH bpf-next v4 1/4] selftests/bpf: convert get_current_cgroup_id_user 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: <20240813-convert_cgroup_tests-v4-1-a33c03458cf6@bootlin.com> References: <20240813-convert_cgroup_tests-v4-0-a33c03458cf6@bootlin.com> In-Reply-To: <20240813-convert_cgroup_tests-v4-0-a33c03458cf6@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 , linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Alan Maguire , =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Mailer: b4 0.14.1 X-GND-Sasl: alexis.lothore@bootlin.com get_current_cgroup_id_user allows testing for bpf_get_current_cgroup_id() bpf API but is not integrated into test_progs, and so is not tested automatically in CI. Convert it to the test_progs framework to allow running it automatically. The most notable differences with the old test are the following: - the new test relies on autoattach instead of manually hooking/enabling the targeted tracepoint through perf_event, which reduces quite a lot the test code size - it also accesses bpf prog data through global variables instead of maps - sleep duration passed to nanosleep syscall has been reduced to its minimum to not impact overall CI duration (we only care about the syscall being properly triggered, not about the passed duration) Signed-off-by: Alexis Lothoré (eBPF Foundation) --- Changes in v3: - close leaking cgroup file descriptor Changes in v2: - use global variables instead of maps The new test_progs part has been tested in a local qemu environment: ./test_progs -a cgroup_get_current_cgroup_id 47 cgroup_get_current_cgroup_id:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED --- tools/testing/selftests/bpf/.gitignore | 1 - tools/testing/selftests/bpf/Makefile | 3 +- tools/testing/selftests/bpf/get_cgroup_id_user.c | 151 --------------------- .../bpf/prog_tests/cgroup_get_current_cgroup_id.c | 46 +++++++ .../selftests/bpf/progs/get_cgroup_id_kern.c | 26 +--- 5 files changed, 51 insertions(+), 176 deletions(-) diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore index 8f14d8faeb0b..7d4d5d3e0210 100644 --- a/tools/testing/selftests/bpf/.gitignore +++ b/tools/testing/selftests/bpf/.gitignore @@ -19,7 +19,6 @@ test_sock urandom_read test_sockmap test_lirc_mode2_user -get_cgroup_id_user test_skb_cgroup_id_user test_cgroup_storage test_flow_dissector diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 7e4b107b37b4..7e8f6354c115 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -67,7 +67,7 @@ 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_sock test_sockmap get_cgroup_id_user \ + test_sock test_sockmap \ test_cgroup_storage \ test_tcpnotify_user test_sysctl \ test_progs-no_alu32 @@ -295,7 +295,6 @@ $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_tcpnotify_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(TRACE_HELPERS) -$(OUTPUT)/get_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_cgroup_storage: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sock_fields: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sysctl: $(CGROUP_HELPERS) $(TESTING_HELPERS) diff --git a/tools/testing/selftests/bpf/get_cgroup_id_user.c b/tools/testing/selftests/bpf/get_cgroup_id_user.c deleted file mode 100644 index aefd83ebdcd7..000000000000 --- a/tools/testing/selftests/bpf/get_cgroup_id_user.c +++ /dev/null @@ -1,151 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -// Copyright (c) 2018 Facebook - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -#include "cgroup_helpers.h" -#include "testing_helpers.h" - -#define CHECK(condition, tag, format...) ({ \ - int __ret = !!(condition); \ - if (__ret) { \ - printf("%s:FAIL:%s ", __func__, tag); \ - printf(format); \ - } else { \ - printf("%s:PASS:%s\n", __func__, tag); \ - } \ - __ret; \ -}) - -static int bpf_find_map(const char *test, struct bpf_object *obj, - const char *name) -{ - struct bpf_map *map; - - map = bpf_object__find_map_by_name(obj, name); - if (!map) - return -1; - return bpf_map__fd(map); -} - -#define TEST_CGROUP "/test-bpf-get-cgroup-id/" - -int main(int argc, char **argv) -{ - const char *probe_name = "syscalls/sys_enter_nanosleep"; - const char *file = "get_cgroup_id_kern.bpf.o"; - int err, bytes, efd, prog_fd, pmu_fd; - int cgroup_fd, cgidmap_fd, pidmap_fd; - struct perf_event_attr attr = {}; - struct bpf_object *obj; - __u64 kcgid = 0, ucgid; - __u32 key = 0, pid; - int exit_code = 1; - char buf[256]; - const struct timespec req = { - .tv_sec = 1, - .tv_nsec = 0, - }; - - cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); - if (CHECK(cgroup_fd < 0, "cgroup_setup_and_join", "err %d errno %d\n", cgroup_fd, errno)) - return 1; - - /* Use libbpf 1.0 API mode */ - libbpf_set_strict_mode(LIBBPF_STRICT_ALL); - - err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); - if (CHECK(err, "bpf_prog_test_load", "err %d errno %d\n", err, errno)) - goto cleanup_cgroup_env; - - cgidmap_fd = bpf_find_map(__func__, obj, "cg_ids"); - if (CHECK(cgidmap_fd < 0, "bpf_find_map", "err %d errno %d\n", - cgidmap_fd, errno)) - goto close_prog; - - pidmap_fd = bpf_find_map(__func__, obj, "pidmap"); - if (CHECK(pidmap_fd < 0, "bpf_find_map", "err %d errno %d\n", - pidmap_fd, errno)) - goto close_prog; - - pid = getpid(); - bpf_map_update_elem(pidmap_fd, &key, &pid, 0); - - if (access("/sys/kernel/tracing/trace", F_OK) == 0) { - snprintf(buf, sizeof(buf), - "/sys/kernel/tracing/events/%s/id", probe_name); - } else { - snprintf(buf, sizeof(buf), - "/sys/kernel/debug/tracing/events/%s/id", probe_name); - } - efd = open(buf, O_RDONLY, 0); - if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno)) - goto close_prog; - bytes = read(efd, buf, sizeof(buf)); - close(efd); - if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read", - "bytes %d errno %d\n", bytes, errno)) - goto close_prog; - - attr.config = strtol(buf, NULL, 0); - attr.type = PERF_TYPE_TRACEPOINT; - attr.sample_type = PERF_SAMPLE_RAW; - attr.sample_period = 1; - attr.wakeup_events = 1; - - /* attach to this pid so the all bpf invocations will be in the - * cgroup associated with this pid. - */ - pmu_fd = syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0); - if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd, - errno)) - goto close_prog; - - err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); - if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err, - errno)) - goto close_pmu; - - err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd); - if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err, - errno)) - goto close_pmu; - - /* trigger some syscalls */ - syscall(__NR_nanosleep, &req, NULL); - - err = bpf_map_lookup_elem(cgidmap_fd, &key, &kcgid); - if (CHECK(err, "bpf_map_lookup_elem", "err %d errno %d\n", err, errno)) - goto close_pmu; - - ucgid = get_cgroup_id(TEST_CGROUP); - if (CHECK(kcgid != ucgid, "compare_cgroup_id", - "kern cgid %llx user cgid %llx", kcgid, ucgid)) - goto close_pmu; - - exit_code = 0; - printf("%s:PASS\n", argv[0]); - -close_pmu: - close(pmu_fd); -close_prog: - bpf_object__close(obj); -cleanup_cgroup_env: - cleanup_cgroup_environment(); - return exit_code; -} diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_get_current_cgroup_id.c b/tools/testing/selftests/bpf/prog_tests/cgroup_get_current_cgroup_id.c new file mode 100644 index 000000000000..7a1643b03bf3 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_get_current_cgroup_id.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include "test_progs.h" +#include "cgroup_helpers.h" +#include "get_cgroup_id_kern.skel.h" + +#define TEST_CGROUP "/test-bpf-get-cgroup-id/" + +void test_cgroup_get_current_cgroup_id(void) +{ + struct get_cgroup_id_kern *skel; + const struct timespec req = { + .tv_sec = 0, + .tv_nsec = 1, + }; + int cgroup_fd; + __u64 ucgid; + + cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); + if (!ASSERT_OK_FD(cgroup_fd, "cgroup switch")) + return; + + skel = get_cgroup_id_kern__open_and_load(); + if (!ASSERT_OK_PTR(skel, "load program")) + goto cleanup_cgroup; + + if (!ASSERT_OK(get_cgroup_id_kern__attach(skel), "attach bpf program")) + goto cleanup_progs; + + skel->bss->expected_pid = getpid(); + /* trigger the syscall on which is attached the tested prog */ + if (!ASSERT_OK(syscall(__NR_nanosleep, &req, NULL), "nanosleep")) + goto cleanup_progs; + + ucgid = get_cgroup_id(TEST_CGROUP); + + ASSERT_EQ(skel->bss->cg_id, ucgid, "compare cgroup ids"); + +cleanup_progs: + get_cgroup_id_kern__destroy(skel); +cleanup_cgroup: + close(cgroup_fd); + cleanup_cgroup_environment(); +} diff --git a/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c b/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c index 68587b1de34e..30fd504856c7 100644 --- a/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c +++ b/tools/testing/selftests/bpf/progs/get_cgroup_id_kern.c @@ -4,34 +4,16 @@ #include #include -struct { - __uint(type, BPF_MAP_TYPE_ARRAY); - __uint(max_entries, 1); - __type(key, __u32); - __type(value, __u64); -} cg_ids SEC(".maps"); - -struct { - __uint(type, BPF_MAP_TYPE_ARRAY); - __uint(max_entries, 1); - __type(key, __u32); - __type(value, __u32); -} pidmap SEC(".maps"); +__u64 cg_id; +__u64 expected_pid; SEC("tracepoint/syscalls/sys_enter_nanosleep") int trace(void *ctx) { __u32 pid = bpf_get_current_pid_tgid(); - __u32 key = 0, *expected_pid; - __u64 *val; - - expected_pid = bpf_map_lookup_elem(&pidmap, &key); - if (!expected_pid || *expected_pid != pid) - return 0; - val = bpf_map_lookup_elem(&cg_ids, &key); - if (val) - *val = bpf_get_current_cgroup_id(); + if (expected_pid == pid) + cg_id = bpf_get_current_cgroup_id(); return 0; }