// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
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#include <test_progs.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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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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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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}
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