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Message-Id: <20191017150032.14359-5-cneirabustos@gmail.com>
Date: Thu, 17 Oct 2019 12:00:31 -0300
From: Carlos Neira <cneirabustos@...il.com>
To: netdev@...r.kernel.org
Cc: yhs@...com, ebiederm@...ssion.com, brouer@...hat.com,
bpf@...r.kernel.org, cneirabustos@...il.com
Subject: [PATCH v14 4/5] tools/testing/selftests/bpf: Add self-tests for new helper.
Self tests added for new helper
Signed-off-by: Carlos Neira <cneirabustos@...il.com>
---
.../bpf/prog_tests/get_ns_current_pid_tgid.c | 96 +++++++++++++++++++
.../bpf/progs/get_ns_current_pid_tgid_kern.c | 53 ++++++++++
2 files changed, 149 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/get_ns_current_pid_tgid.c
create mode 100644 tools/testing/selftests/bpf/progs/get_ns_current_pid_tgid_kern.c
diff --git a/tools/testing/selftests/bpf/prog_tests/get_ns_current_pid_tgid.c b/tools/testing/selftests/bpf/prog_tests/get_ns_current_pid_tgid.c
new file mode 100644
index 000000000000..48d9785f89d0
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/get_ns_current_pid_tgid.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Carlos Neira cneirabustos@...il.com */
+#include <test_progs.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+struct bss {
+ __u64 dev;
+ __u64 ino;
+ __u64 pidtgid;
+ __u64 userpidtgid;
+} data;
+
+void test_get_ns_current_pid_tgid(void)
+{
+ const char *probe_name = "raw_tracepoint/sys_enter";
+ const char *file = "get_ns_current_pid_tgid_kern.o";
+ struct bpf_object_load_attr load_attr = {};
+ struct bpf_link *link = NULL;
+ struct bpf_program *prog;
+ struct bpf_map *bss_map;
+ struct bpf_object *obj;
+ int err, duration = 0;
+ const __u32 key = 0;
+ struct stat st;
+ __u64 id;
+
+ obj = bpf_object__open(file);
+ if (CHECK(IS_ERR_OR_NULL(obj), "obj_open",
+ "failed to open '%s': %ld\n",
+ file, PTR_ERR(obj)))
+ goto cleanup;
+
+ prog = bpf_object__find_program_by_title(obj, probe_name);
+ if (CHECK(!prog, "find_probe",
+ "prog '%s' not found\n", probe_name))
+ goto cleanup;
+
+ bpf_program__set_type(prog, BPF_PROG_TYPE_RAW_TRACEPOINT);
+
+ load_attr.obj = obj;
+ load_attr.log_level = 0;
+ load_attr.target_btf_path = NULL;
+ err = bpf_object__load_xattr(&load_attr);
+ if (CHECK(err, "obj_load",
+ "failed to load prog '%s': %d\n",
+ probe_name, err))
+ goto cleanup;
+
+ link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
+ if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n",
+ PTR_ERR(link)))
+ goto cleanup;
+
+ bss_map = bpf_object__find_map_by_name(obj, "ns_data_map");
+ if (CHECK(!bss_map, "find_bss_map", "failed\n"))
+ goto cleanup;
+
+ memset(&data, 0, sizeof(data));
+ pid_t tid = syscall(SYS_gettid);
+ pid_t pid = getpid();
+
+ id = (__u64) tid << 32 | pid;
+ data.userpidtgid = id;
+
+ if (CHECK(stat("/proc/self/ns/pid", &st), "stat","failed\n"))
+ goto cleanup;
+
+ data.dev = st.st_dev;
+ data.ino = st.st_ino;
+
+ err = bpf_map_update_elem(bpf_map__fd(bss_map), &key, &data, 0);
+ if (CHECK(err, "setting_bss", "failed to set bss data: %d\n", err))
+ goto cleanup;
+
+ /* trigger some syscalls */
+ usleep(1);
+
+ err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &key, &data);
+ if (CHECK(err, "set_bss", "failed to get bss data: %d\n", err))
+ goto cleanup;
+
+ if (CHECK(id != data.pidtgid, "Compare user pid/tgid vs. bpf pid/tgid",
+ "User pid/tgid %llu EBPF pid/tgid %llu\n", id, data.pidtgid))
+ goto cleanup;
+cleanup:
+
+ if (!IS_ERR_OR_NULL(link)) {
+ bpf_link__destroy(link);
+ link = NULL;
+ }
+ bpf_object__close(obj);
+}
diff --git a/tools/testing/selftests/bpf/progs/get_ns_current_pid_tgid_kern.c b/tools/testing/selftests/bpf/progs/get_ns_current_pid_tgid_kern.c
new file mode 100644
index 000000000000..1fd847b63105
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/get_ns_current_pid_tgid_kern.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Carlos Neira cneirabustos@...il.com */
+
+#include <linux/bpf.h>
+#include <stdint.h>
+#include "bpf_helpers.h"
+#include "bpf_core_read.h"
+
+struct res {
+ __u64 dev;
+ __u64 ino;
+ __u64 pidtgid;
+ __u64 userpidtgid;
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __uint(max_entries, 1);
+ __type(key, __u32);
+ __type(value, struct res);
+} ns_data_map SEC(".maps");
+
+static struct res data;
+
+SEC("raw_tracepoint/sys_enter")
+int trace(void *ctx)
+{
+ __u64 nspidtgid, expected_pid;
+ struct bpf_pidns_info nsdata;
+ const __u32 key = 0;
+ struct res *pres;
+
+ pres = bpf_map_lookup_elem(&ns_data_map, &key);
+ if (!pres)
+ return 0;
+
+ if (bpf_get_ns_current_pid_tgid(pres->dev, pres->ino, &nsdata,
+ sizeof(struct bpf_pidns_info)))
+ return 0;
+
+ nspidtgid = (__u64)nsdata.tgid << 32 | nsdata.pid;
+ expected_pid = pres->userpidtgid;
+
+ if (expected_pid != nspidtgid)
+ return 0;
+
+ data.pidtgid = nspidtgid;
+ bpf_map_update_elem(&ns_data_map, &key, &data, 0);
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.20.1
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