mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 14:53:58 -04:00
aa181c7d64
Patch 1/2 added PID filtering to the probe_user BPF program to avoid cross-test interference from the global connect() hooks. With the interference removed, drop the serial_ prefix and remove the stale TODO comment so the test can run in parallel. Tested: ./test_progs -t probe_user -v ./test_progs -j$(nproc) -t probe_user Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20260306083330.518627-2-sun.jian.kdev@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <test_progs.h>
|
|
|
|
void test_probe_user(void)
|
|
{
|
|
static const char *const prog_names[] = {
|
|
"handle_sys_connect",
|
|
#if defined(__s390x__)
|
|
"handle_sys_socketcall",
|
|
#endif
|
|
};
|
|
enum { prog_count = ARRAY_SIZE(prog_names) };
|
|
const char *obj_file = "./test_probe_user.bpf.o";
|
|
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, );
|
|
int err, results_map_fd, sock_fd, duration = 0;
|
|
struct sockaddr curr, orig, tmp;
|
|
struct sockaddr_in *in = (struct sockaddr_in *)&curr;
|
|
struct bpf_link *kprobe_links[prog_count] = {};
|
|
struct bpf_program *kprobe_progs[prog_count];
|
|
struct bpf_object *obj;
|
|
static const int zero = 0;
|
|
struct test_pro_bss {
|
|
struct sockaddr_in old;
|
|
__u32 test_pid;
|
|
};
|
|
struct test_pro_bss results = {};
|
|
size_t i;
|
|
|
|
obj = bpf_object__open_file(obj_file, &opts);
|
|
if (!ASSERT_OK_PTR(obj, "obj_open_file"))
|
|
return;
|
|
|
|
for (i = 0; i < prog_count; i++) {
|
|
kprobe_progs[i] =
|
|
bpf_object__find_program_by_name(obj, prog_names[i]);
|
|
if (CHECK(!kprobe_progs[i], "find_probe",
|
|
"prog '%s' not found\n", prog_names[i]))
|
|
goto cleanup;
|
|
}
|
|
|
|
{
|
|
struct bpf_map *bss_map;
|
|
struct test_pro_bss bss_init = {};
|
|
|
|
bss_init.test_pid = getpid();
|
|
bss_map = bpf_object__find_map_by_name(obj, "test_pro.bss");
|
|
if (!ASSERT_OK_PTR(bss_map, "find_bss_map"))
|
|
goto cleanup;
|
|
if (!ASSERT_EQ(bpf_map__value_size(bss_map), sizeof(bss_init),
|
|
"bss_size"))
|
|
goto cleanup;
|
|
err = bpf_map__set_initial_value(bss_map, &bss_init,
|
|
sizeof(bss_init));
|
|
if (!ASSERT_OK(err, "set_bss_init"))
|
|
goto cleanup;
|
|
}
|
|
|
|
err = bpf_object__load(obj);
|
|
if (CHECK(err, "obj_load", "err %d\n", err))
|
|
goto cleanup;
|
|
|
|
results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss");
|
|
if (CHECK(results_map_fd < 0, "find_bss_map",
|
|
"err %d\n", results_map_fd))
|
|
goto cleanup;
|
|
|
|
for (i = 0; i < prog_count; i++) {
|
|
kprobe_links[i] = bpf_program__attach(kprobe_progs[i]);
|
|
if (!ASSERT_OK_PTR(kprobe_links[i], "attach_kprobe"))
|
|
goto cleanup;
|
|
}
|
|
|
|
memset(&curr, 0, sizeof(curr));
|
|
in->sin_family = AF_INET;
|
|
in->sin_port = htons(5555);
|
|
in->sin_addr.s_addr = inet_addr("255.255.255.255");
|
|
memcpy(&orig, &curr, sizeof(curr));
|
|
|
|
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd))
|
|
goto cleanup;
|
|
|
|
connect(sock_fd, &curr, sizeof(curr));
|
|
close(sock_fd);
|
|
|
|
err = bpf_map_lookup_elem(results_map_fd, &zero, &results);
|
|
if (CHECK(err, "get_kprobe_res",
|
|
"failed to get kprobe res: %d\n", err))
|
|
goto cleanup;
|
|
|
|
memcpy(&tmp, &results.old, sizeof(tmp));
|
|
|
|
in = (struct sockaddr_in *)&tmp;
|
|
if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res",
|
|
"wrong kprobe res from probe read: %s:%u\n",
|
|
inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
|
|
goto cleanup;
|
|
|
|
memset(&tmp, 0xab, sizeof(tmp));
|
|
|
|
in = (struct sockaddr_in *)&curr;
|
|
if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res",
|
|
"wrong kprobe res from probe write: %s:%u\n",
|
|
inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
|
|
goto cleanup;
|
|
cleanup:
|
|
for (i = 0; i < prog_count; i++)
|
|
bpf_link__destroy(kprobe_links[i]);
|
|
bpf_object__close(obj);
|
|
}
|