diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c | 118 |
1 files changed, 60 insertions, 58 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c index e74dc501b27f..31a3114906e2 100644 --- a/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c +++ b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c @@ -1,85 +1,87 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */ + +#define _GNU_SOURCE #include <test_progs.h> +#include "test_ns_current_pid_tgid.skel.h" #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> #include <sys/syscall.h> +#include <sched.h> +#include <sys/wait.h> +#include <sys/mount.h> +#include <sys/fcntl.h> -struct bss { - __u64 dev; - __u64 ino; - __u64 pid_tgid; - __u64 user_pid_tgid; -}; +#define STACK_SIZE (1024 * 1024) +static char child_stack[STACK_SIZE]; -void test_ns_current_pid_tgid(void) +static int test_current_pid_tgid(void *args) { - const char *probe_name = "raw_tracepoint/sys_enter"; - const char *file = "test_ns_current_pid_tgid.o"; - int err, key = 0, duration = 0; - struct bpf_link *link = NULL; - struct bpf_program *prog; - struct bpf_map *bss_map; - struct bpf_object *obj; - struct bss bss; + struct test_ns_current_pid_tgid__bss *bss; + struct test_ns_current_pid_tgid *skel; + int err = -1, duration = 0; + pid_t tgid, pid; struct stat st; - __u64 id; - - obj = bpf_object__open_file(file, NULL); - if (CHECK(IS_ERR(obj), "obj_open", "err %ld\n", PTR_ERR(obj))) - return; - err = bpf_object__load(obj); - if (CHECK(err, "obj_load", "err %d errno %d\n", err, errno)) + skel = test_ns_current_pid_tgid__open_and_load(); + if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n")) goto cleanup; - bss_map = bpf_object__find_map_by_name(obj, "test_ns_.bss"); - if (CHECK(!bss_map, "find_bss_map", "failed\n")) + pid = syscall(SYS_gettid); + tgid = getpid(); + + err = stat("/proc/self/ns/pid", &st); + if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", err)) goto cleanup; - prog = bpf_object__find_program_by_title(obj, probe_name); - if (CHECK(!prog, "find_prog", "prog '%s' not found\n", - probe_name)) + bss = skel->bss; + bss->dev = st.st_dev; + bss->ino = st.st_ino; + bss->user_pid = 0; + bss->user_tgid = 0; + + err = test_ns_current_pid_tgid__attach(skel); + if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err)) goto cleanup; - memset(&bss, 0, sizeof(bss)); - pid_t tid = syscall(SYS_gettid); - pid_t pid = getpid(); + /* trigger tracepoint */ + usleep(1); + ASSERT_EQ(bss->user_pid, pid, "pid"); + ASSERT_EQ(bss->user_tgid, tgid, "tgid"); + err = 0; - id = (__u64) tid << 32 | pid; - bss.user_pid_tgid = id; +cleanup: + test_ns_current_pid_tgid__destroy(skel); - if (CHECK_FAIL(stat("/proc/self/ns/pid", &st))) { - perror("Failed to stat /proc/self/ns/pid"); - goto cleanup; - } + return err; +} - bss.dev = st.st_dev; - bss.ino = st.st_ino; +static void test_ns_current_pid_tgid_new_ns(void) +{ + int wstatus, duration = 0; + pid_t cpid; - err = bpf_map_update_elem(bpf_map__fd(bss_map), &key, &bss, 0); - if (CHECK(err, "setting_bss", "failed to set bss : %d\n", err)) - goto cleanup; + /* Create a process in a new namespace, this process + * will be the init process of this new namespace hence will be pid 1. + */ + cpid = clone(test_current_pid_tgid, child_stack + STACK_SIZE, + CLONE_NEWPID | SIGCHLD, NULL); - link = bpf_program__attach_raw_tracepoint(prog, "sys_enter"); - if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", - PTR_ERR(link))) { - link = NULL; - goto cleanup; - } + if (CHECK(cpid == -1, "clone", strerror(errno))) + return; - /* trigger some syscalls */ - usleep(1); + if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", strerror(errno))) + return; - err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &key, &bss); - if (CHECK(err, "set_bss", "failed to get bss : %d\n", err)) - goto cleanup; + if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid", "failed")) + return; +} - if (CHECK(id != bss.pid_tgid, "Compare user pid/tgid vs. bpf pid/tgid", - "User pid/tgid %llu BPF pid/tgid %llu\n", id, bss.pid_tgid)) - goto cleanup; -cleanup: - bpf_link__destroy(link); - bpf_object__close(obj); +void test_ns_current_pid_tgid(void) +{ + if (test__start_subtest("ns_current_pid_tgid_root_ns")) + test_current_pid_tgid(NULL); + if (test__start_subtest("ns_current_pid_tgid_new_ns")) + test_ns_current_pid_tgid_new_ns(); } |