@@ -26,7 +26,6 @@ test_tcpnotify_user
test_libbpf
test_tcp_check_syncookie_user
test_sysctl
-test_current_pid_tgid_new_ns
xdping
test_cpp
*.skel.h
@@ -35,8 +35,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
test_sock test_sockmap get_cgroup_id_user test_socket_cookie \
test_cgroup_storage \
test_netcnt test_tcpnotify_user test_sysctl \
- test_progs-no_alu32 \
- test_current_pid_tgid_new_ns
+ test_progs-no_alu32
# Also test bpf-gcc, if present
ifneq ($(BPF_GCC),)
@@ -1,85 +1,126 @@
// 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 void test_ns_current_pid_tgid_global_ns(void)
{
- 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, duration = 0;
struct stat st;
- __u64 id;
+ pid_t tgid, pid;
- 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");
- id = (__u64) tid << 32 | pid;
- bss.user_pid_tgid = id;
+cleanup:
+ test_ns_current_pid_tgid__destroy(skel);
+}
+
+static int newns_pidtgid(void *arg)
+{
+ struct test_ns_current_pid_tgid__bss *bss;
+ int err = 0, duration = 0;
+ struct test_ns_current_pid_tgid *skel;
+ pid_t pid, tgid;
+ struct stat st;
- if (CHECK_FAIL(stat("/proc/self/ns/pid", &st))) {
- perror("Failed to stat /proc/self/ns/pid");
+ skel = test_ns_current_pid_tgid__open_and_load();
+ if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n"))
goto cleanup;
- }
- bss.dev = st.st_dev;
- bss.ino = st.st_ino;
+ pid = syscall(SYS_gettid);
+ tgid = getpid();
- 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))
+ err = stat("/proc/self/ns/pid", &st);
+ if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", 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))) {
- link = NULL;
+ 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;
- }
- /* trigger some syscalls */
+ /* trigger tracepoint */
usleep(1);
+ ASSERT_EQ(bss->user_pid, pid, "pid");
+ ASSERT_EQ(bss->user_tgid, tgid, "tgid");
- 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(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);
+ test_ns_current_pid_tgid__destroy(skel);
+
+ return err;
+}
+
+static void test_ns_current_pid_tgid_new_ns(void)
+{
+ int wstatus, duration = 0;
+ pid_t cpid;
+ /* 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(newns_pidtgid,
+ child_stack + STACK_SIZE,
+ CLONE_NEWPID | SIGCHLD, NULL);
+
+ if (CHECK(cpid == -1, "clone", strerror(errno)))
+ exit(EXIT_FAILURE);
+
+ if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid",
+ strerror(errno)))
+ exit(EXIT_FAILURE);
+
+ if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid",
+ "failed"))
+ exit(EXIT_FAILURE);
+}
+
+void test_ns_current_pid_tgid(void)
+{
+ if (test__start_subtest("ns_current_pid_tgid_global_ns"))
+ test_ns_current_pid_tgid_global_ns();
+ if (test__start_subtest("ns_current_pid_tgid_new_ns"))
+ test_ns_current_pid_tgid_new_ns();
}
@@ -5,31 +5,22 @@
#include <stdint.h>
#include <bpf/bpf_helpers.h>
-static volatile struct {
- __u64 dev;
- __u64 ino;
- __u64 pid_tgid;
- __u64 user_pid_tgid;
-} res;
+__u64 user_pid = 0;
+__u64 user_tgid = 0;
+__u64 dev = 0;
+__u64 ino = 0;
-SEC("raw_tracepoint/sys_enter")
-int trace(void *ctx)
+SEC("tracepoint/syscalls/sys_enter_nanosleep")
+int handler(const void *ctx)
{
- __u64 ns_pid_tgid, expected_pid;
struct bpf_pidns_info nsdata;
- __u32 key = 0;
- if (bpf_get_ns_current_pid_tgid(res.dev, res.ino, &nsdata,
- sizeof(struct bpf_pidns_info)))
+ if (bpf_get_ns_current_pid_tgid(dev, ino, &nsdata,
+ sizeof(struct bpf_pidns_info)))
return 0;
- ns_pid_tgid = (__u64)nsdata.tgid << 32 | nsdata.pid;
- expected_pid = res.user_pid_tgid;
-
- if (expected_pid != ns_pid_tgid)
- return 0;
-
- res.pid_tgid = ns_pid_tgid;
+ user_pid = nsdata.pid;
+ user_tgid = nsdata.tgid;
return 0;
}
deleted file mode 100644
@@ -1,160 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
-#define _GNU_SOURCE
-#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 "test_progs.h"
-
-#define CHECK_NEWNS(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; \
-})
-
-struct bss {
- __u64 dev;
- __u64 ino;
- __u64 pid_tgid;
- __u64 user_pid_tgid;
-};
-
-int main(int argc, char **argv)
-{
- pid_t pid;
- int exit_code = 1;
- struct stat st;
-
- printf("Testing bpf_get_ns_current_pid_tgid helper in new ns\n");
-
- if (stat("/proc/self/ns/pid", &st)) {
- perror("stat failed on /proc/self/ns/pid ns\n");
- printf("%s:FAILED\n", argv[0]);
- return exit_code;
- }
-
- if (CHECK_NEWNS(unshare(CLONE_NEWPID | CLONE_NEWNS),
- "unshare CLONE_NEWPID | CLONE_NEWNS", "error errno=%d\n", errno))
- return exit_code;
-
- pid = fork();
- if (pid == -1) {
- perror("Fork() failed\n");
- printf("%s:FAILED\n", argv[0]);
- return exit_code;
- }
-
- if (pid > 0) {
- int status;
-
- usleep(5);
- waitpid(pid, &status, 0);
- return 0;
- } else {
-
- pid = fork();
- if (pid == -1) {
- perror("Fork() failed\n");
- printf("%s:FAILED\n", argv[0]);
- return exit_code;
- }
-
- if (pid > 0) {
- int status;
- waitpid(pid, &status, 0);
- return 0;
- } else {
- if (CHECK_NEWNS(mount("none", "/proc", NULL, MS_PRIVATE|MS_REC, NULL),
- "Unmounting proc", "Cannot umount proc! errno=%d\n", errno))
- return exit_code;
-
- if (CHECK_NEWNS(mount("proc", "/proc", "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL),
- "Mounting proc", "Cannot mount proc! errno=%d\n", errno))
- return exit_code;
-
- const char *probe_name = "raw_tracepoint/sys_enter";
- const char *file = "test_ns_current_pid_tgid.o";
- struct bpf_link *link = NULL;
- struct bpf_program *prog;
- struct bpf_map *bss_map;
- struct bpf_object *obj;
- int exit_code = 1;
- int err, key = 0;
- struct bss bss;
- struct stat st;
- __u64 id;
-
- obj = bpf_object__open_file(file, NULL);
- if (CHECK_NEWNS(IS_ERR(obj), "obj_open", "err %ld\n", PTR_ERR(obj)))
- return exit_code;
-
- err = bpf_object__load(obj);
- if (CHECK_NEWNS(err, "obj_load", "err %d errno %d\n", err, errno))
- goto cleanup;
-
- bss_map = bpf_object__find_map_by_name(obj, "test_ns_.bss");
- if (CHECK_NEWNS(!bss_map, "find_bss_map", "failed\n"))
- goto cleanup;
-
- prog = bpf_object__find_program_by_title(obj, probe_name);
- if (CHECK_NEWNS(!prog, "find_prog", "prog '%s' not found\n",
- probe_name))
- goto cleanup;
-
- memset(&bss, 0, sizeof(bss));
- pid_t tid = syscall(SYS_gettid);
- pid_t pid = getpid();
-
- id = (__u64) tid << 32 | pid;
- bss.user_pid_tgid = id;
-
- if (CHECK_NEWNS(stat("/proc/self/ns/pid", &st),
- "stat new ns", "Failed to stat /proc/self/ns/pid errno=%d\n", errno))
- goto cleanup;
-
- bss.dev = st.st_dev;
- bss.ino = st.st_ino;
-
- err = bpf_map_update_elem(bpf_map__fd(bss_map), &key, &bss, 0);
- if (CHECK_NEWNS(err, "setting_bss", "failed to set bss : %d\n", err))
- goto cleanup;
-
- link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
- if (CHECK_NEWNS(IS_ERR(link), "attach_raw_tp", "err %ld\n",
- PTR_ERR(link))) {
- link = NULL;
- goto cleanup;
- }
-
- /* trigger some syscalls */
- usleep(1);
-
- err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &key, &bss);
- if (CHECK_NEWNS(err, "set_bss", "failed to get bss : %d\n", err))
- goto cleanup;
-
- if (CHECK_NEWNS(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;
-
- exit_code = 0;
- printf("%s:PASS\n", argv[0]);
-cleanup:
- if (!link) {
- bpf_link__destroy(link);
- link = NULL;
- }
- bpf_object__close(obj);
- }
- }
- return 0;
-}
Currently tests for bpf_get_ns_current_pid_tgid() are outside test_progs. This change folds test cases into test_progs. Changes from v9: - Added test in root namespace. - Fixed changed tracepoint from sys_enter to sys_usleep. - Fixed pid, tgid values were inverted. - Used CLONE(2) for namespaced test, the new process pid will be 1. - Used ASSERTEQ on pid/tgid validation. - Added comment on CLONE(2) call Signed-off-by: Carlos Neira <cneirabustos@gmail.com> --- tools/testing/selftests/bpf/.gitignore | 1 - tools/testing/selftests/bpf/Makefile | 3 +- .../bpf/prog_tests/ns_current_pid_tgid.c | 149 ++++++++++------ .../bpf/progs/test_ns_current_pid_tgid.c | 29 ++-- .../bpf/test_current_pid_tgid_new_ns.c | 160 ------------------ 5 files changed, 106 insertions(+), 236 deletions(-) delete mode 100644 tools/testing/selftests/bpf/test_current_pid_tgid_new_ns.c