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bpf, selftests: Fold test_current_pid_tgid_new_ns into test_progs.
Currently tests for bpf_get_ns_current_pid_tgid() are outside test_progs. This change folds test cases into test_progs. Changes from v11: - Fixed test failure is not detected. - Removed EXIT(3) call as it will stop test_progs execution. Signed-off-by: Carlos Neira <cneirabustos@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210114141033.GA17348@localhost Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Carlos Neira
Alexei Starovoitov
parent
0fe2f273ab
commit
09c02d553c
1
tools/testing/selftests/bpf/.gitignore
vendored
1
tools/testing/selftests/bpf/.gitignore
vendored
@ -26,7 +26,6 @@ test_tcpnotify_user
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test_libbpf
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test_tcp_check_syncookie_user
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test_sysctl
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test_current_pid_tgid_new_ns
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xdping
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test_cpp
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*.skel.h
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@ -36,8 +36,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
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test_sock test_sockmap get_cgroup_id_user test_socket_cookie \
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test_cgroup_storage \
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test_netcnt test_tcpnotify_user test_sysctl \
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test_progs-no_alu32 \
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test_current_pid_tgid_new_ns
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test_progs-no_alu32
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# Also test bpf-gcc, if present
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ifneq ($(BPF_GCC),)
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@ -1,85 +1,87 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
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#define _GNU_SOURCE
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#include <test_progs.h>
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#include "test_ns_current_pid_tgid.skel.h"
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sched.h>
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#include <sys/wait.h>
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#include <sys/mount.h>
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#include <sys/fcntl.h>
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struct bss {
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__u64 dev;
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__u64 ino;
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__u64 pid_tgid;
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__u64 user_pid_tgid;
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};
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#define STACK_SIZE (1024 * 1024)
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static char child_stack[STACK_SIZE];
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static int test_current_pid_tgid(void *args)
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{
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struct test_ns_current_pid_tgid__bss *bss;
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struct test_ns_current_pid_tgid *skel;
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int err = -1, duration = 0;
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pid_t tgid, pid;
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struct stat st;
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skel = test_ns_current_pid_tgid__open_and_load();
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if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n"))
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goto cleanup;
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pid = syscall(SYS_gettid);
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tgid = getpid();
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err = stat("/proc/self/ns/pid", &st);
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if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", err))
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goto cleanup;
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bss = skel->bss;
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bss->dev = st.st_dev;
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bss->ino = st.st_ino;
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bss->user_pid = 0;
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bss->user_tgid = 0;
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err = test_ns_current_pid_tgid__attach(skel);
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if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
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goto cleanup;
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/* trigger tracepoint */
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usleep(1);
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ASSERT_EQ(bss->user_pid, pid, "pid");
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ASSERT_EQ(bss->user_tgid, tgid, "tgid");
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err = 0;
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cleanup:
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test_ns_current_pid_tgid__destroy(skel);
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return err;
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}
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static void test_ns_current_pid_tgid_new_ns(void)
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{
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int wstatus, duration = 0;
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pid_t cpid;
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/* Create a process in a new namespace, this process
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* will be the init process of this new namespace hence will be pid 1.
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*/
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cpid = clone(test_current_pid_tgid, child_stack + STACK_SIZE,
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CLONE_NEWPID | SIGCHLD, NULL);
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if (CHECK(cpid == -1, "clone", strerror(errno)))
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return;
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if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", strerror(errno)))
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return;
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if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid", "failed"))
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return;
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}
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void test_ns_current_pid_tgid(void)
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{
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const char *probe_name = "raw_tracepoint/sys_enter";
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const char *file = "test_ns_current_pid_tgid.o";
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int err, key = 0, duration = 0;
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struct bpf_link *link = NULL;
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struct bpf_program *prog;
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struct bpf_map *bss_map;
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struct bpf_object *obj;
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struct bss bss;
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struct stat st;
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__u64 id;
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obj = bpf_object__open_file(file, NULL);
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if (CHECK(IS_ERR(obj), "obj_open", "err %ld\n", PTR_ERR(obj)))
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return;
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err = bpf_object__load(obj);
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if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno))
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goto cleanup;
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bss_map = bpf_object__find_map_by_name(obj, "test_ns_.bss");
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if (CHECK(!bss_map, "find_bss_map", "failed\n"))
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goto cleanup;
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prog = bpf_object__find_program_by_title(obj, probe_name);
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if (CHECK(!prog, "find_prog", "prog '%s' not found\n",
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probe_name))
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goto cleanup;
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memset(&bss, 0, sizeof(bss));
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pid_t tid = syscall(SYS_gettid);
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pid_t pid = getpid();
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id = (__u64) tid << 32 | pid;
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bss.user_pid_tgid = id;
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if (CHECK_FAIL(stat("/proc/self/ns/pid", &st))) {
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perror("Failed to stat /proc/self/ns/pid");
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goto cleanup;
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}
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bss.dev = st.st_dev;
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bss.ino = st.st_ino;
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err = bpf_map_update_elem(bpf_map__fd(bss_map), &key, &bss, 0);
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if (CHECK(err, "setting_bss", "failed to set bss : %d\n", err))
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goto cleanup;
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link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
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if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n",
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PTR_ERR(link))) {
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link = NULL;
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goto cleanup;
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}
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/* trigger some syscalls */
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usleep(1);
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err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &key, &bss);
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if (CHECK(err, "set_bss", "failed to get bss : %d\n", err))
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goto cleanup;
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if (CHECK(id != bss.pid_tgid, "Compare user pid/tgid vs. bpf pid/tgid",
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"User pid/tgid %llu BPF pid/tgid %llu\n", id, bss.pid_tgid))
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goto cleanup;
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cleanup:
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bpf_link__destroy(link);
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bpf_object__close(obj);
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if (test__start_subtest("ns_current_pid_tgid_root_ns"))
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test_current_pid_tgid(NULL);
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if (test__start_subtest("ns_current_pid_tgid_new_ns"))
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test_ns_current_pid_tgid_new_ns();
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}
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@ -5,31 +5,21 @@
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#include <stdint.h>
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#include <bpf/bpf_helpers.h>
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static volatile struct {
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__u64 dev;
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__u64 ino;
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__u64 pid_tgid;
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__u64 user_pid_tgid;
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} res;
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__u64 user_pid = 0;
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__u64 user_tgid = 0;
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__u64 dev = 0;
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__u64 ino = 0;
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SEC("raw_tracepoint/sys_enter")
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int trace(void *ctx)
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SEC("tracepoint/syscalls/sys_enter_nanosleep")
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int handler(const void *ctx)
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{
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__u64 ns_pid_tgid, expected_pid;
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struct bpf_pidns_info nsdata;
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__u32 key = 0;
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if (bpf_get_ns_current_pid_tgid(res.dev, res.ino, &nsdata,
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sizeof(struct bpf_pidns_info)))
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if (bpf_get_ns_current_pid_tgid(dev, ino, &nsdata, sizeof(struct bpf_pidns_info)))
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return 0;
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ns_pid_tgid = (__u64)nsdata.tgid << 32 | nsdata.pid;
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expected_pid = res.user_pid_tgid;
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if (expected_pid != ns_pid_tgid)
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return 0;
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res.pid_tgid = ns_pid_tgid;
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user_pid = nsdata.pid;
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user_tgid = nsdata.tgid;
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return 0;
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}
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@ -1,160 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
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#define _GNU_SOURCE
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sched.h>
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#include <sys/wait.h>
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#include <sys/mount.h>
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#include "test_progs.h"
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#define CHECK_NEWNS(condition, tag, format...) ({ \
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int __ret = !!(condition); \
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if (__ret) { \
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printf("%s:FAIL:%s ", __func__, tag); \
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printf(format); \
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} else { \
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printf("%s:PASS:%s\n", __func__, tag); \
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} \
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__ret; \
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})
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struct bss {
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__u64 dev;
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__u64 ino;
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__u64 pid_tgid;
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__u64 user_pid_tgid;
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};
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int main(int argc, char **argv)
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{
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pid_t pid;
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int exit_code = 1;
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struct stat st;
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printf("Testing bpf_get_ns_current_pid_tgid helper in new ns\n");
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if (stat("/proc/self/ns/pid", &st)) {
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perror("stat failed on /proc/self/ns/pid ns\n");
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printf("%s:FAILED\n", argv[0]);
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return exit_code;
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}
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if (CHECK_NEWNS(unshare(CLONE_NEWPID | CLONE_NEWNS),
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"unshare CLONE_NEWPID | CLONE_NEWNS", "error errno=%d\n", errno))
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return exit_code;
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pid = fork();
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if (pid == -1) {
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perror("Fork() failed\n");
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printf("%s:FAILED\n", argv[0]);
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return exit_code;
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}
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if (pid > 0) {
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int status;
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usleep(5);
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waitpid(pid, &status, 0);
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return 0;
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} else {
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pid = fork();
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if (pid == -1) {
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perror("Fork() failed\n");
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printf("%s:FAILED\n", argv[0]);
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return exit_code;
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}
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if (pid > 0) {
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int status;
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waitpid(pid, &status, 0);
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return 0;
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} else {
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if (CHECK_NEWNS(mount("none", "/proc", NULL, MS_PRIVATE|MS_REC, NULL),
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"Unmounting proc", "Cannot umount proc! errno=%d\n", errno))
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return exit_code;
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if (CHECK_NEWNS(mount("proc", "/proc", "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL),
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"Mounting proc", "Cannot mount proc! errno=%d\n", errno))
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return exit_code;
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const char *probe_name = "raw_tracepoint/sys_enter";
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const char *file = "test_ns_current_pid_tgid.o";
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struct bpf_link *link = NULL;
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struct bpf_program *prog;
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struct bpf_map *bss_map;
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struct bpf_object *obj;
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int exit_code = 1;
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int err, key = 0;
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struct bss bss;
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struct stat st;
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__u64 id;
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obj = bpf_object__open_file(file, NULL);
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if (CHECK_NEWNS(IS_ERR(obj), "obj_open", "err %ld\n", PTR_ERR(obj)))
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return exit_code;
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err = bpf_object__load(obj);
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if (CHECK_NEWNS(err, "obj_load", "err %d errno %d\n", err, errno))
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goto cleanup;
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bss_map = bpf_object__find_map_by_name(obj, "test_ns_.bss");
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if (CHECK_NEWNS(!bss_map, "find_bss_map", "failed\n"))
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goto cleanup;
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prog = bpf_object__find_program_by_title(obj, probe_name);
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if (CHECK_NEWNS(!prog, "find_prog", "prog '%s' not found\n",
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probe_name))
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goto cleanup;
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memset(&bss, 0, sizeof(bss));
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pid_t tid = syscall(SYS_gettid);
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pid_t pid = getpid();
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id = (__u64) tid << 32 | pid;
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bss.user_pid_tgid = id;
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if (CHECK_NEWNS(stat("/proc/self/ns/pid", &st),
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"stat new ns", "Failed to stat /proc/self/ns/pid errno=%d\n", errno))
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goto cleanup;
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bss.dev = st.st_dev;
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bss.ino = st.st_ino;
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err = bpf_map_update_elem(bpf_map__fd(bss_map), &key, &bss, 0);
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if (CHECK_NEWNS(err, "setting_bss", "failed to set bss : %d\n", err))
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goto cleanup;
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link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
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if (CHECK_NEWNS(IS_ERR(link), "attach_raw_tp", "err %ld\n",
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PTR_ERR(link))) {
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link = NULL;
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goto cleanup;
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}
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/* trigger some syscalls */
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usleep(1);
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err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &key, &bss);
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if (CHECK_NEWNS(err, "set_bss", "failed to get bss : %d\n", err))
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goto cleanup;
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if (CHECK_NEWNS(id != bss.pid_tgid, "Compare user pid/tgid vs. bpf pid/tgid",
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"User pid/tgid %llu BPF pid/tgid %llu\n", id, bss.pid_tgid))
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goto cleanup;
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exit_code = 0;
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printf("%s:PASS\n", argv[0]);
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cleanup:
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if (!link) {
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bpf_link__destroy(link);
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link = NULL;
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}
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bpf_object__close(obj);
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}
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}
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return 0;
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}
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