mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
ecb96f7fe1
This is mostly to test kprobe/uprobe which needs kernel headers. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
383 lines
10 KiB
C
383 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
#include <fcntl.h>
|
|
#include <linux/bpf.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "libbpf.h"
|
|
#include "bpf_load.h"
|
|
#include "bpf_util.h"
|
|
#include "perf-sys.h"
|
|
#include "trace_helpers.h"
|
|
|
|
#define CHECK_PERROR_RET(condition) ({ \
|
|
int __ret = !!(condition); \
|
|
if (__ret) { \
|
|
printf("FAIL: %s:\n", __func__); \
|
|
perror(" "); \
|
|
return -1; \
|
|
} \
|
|
})
|
|
|
|
#define CHECK_AND_RET(condition) ({ \
|
|
int __ret = !!(condition); \
|
|
if (__ret) \
|
|
return -1; \
|
|
})
|
|
|
|
static __u64 ptr_to_u64(void *ptr)
|
|
{
|
|
return (__u64) (unsigned long) ptr;
|
|
}
|
|
|
|
#define PMU_TYPE_FILE "/sys/bus/event_source/devices/%s/type"
|
|
static int bpf_find_probe_type(const char *event_type)
|
|
{
|
|
char buf[256];
|
|
int fd, ret;
|
|
|
|
ret = snprintf(buf, sizeof(buf), PMU_TYPE_FILE, event_type);
|
|
CHECK_PERROR_RET(ret < 0 || ret >= sizeof(buf));
|
|
|
|
fd = open(buf, O_RDONLY);
|
|
CHECK_PERROR_RET(fd < 0);
|
|
|
|
ret = read(fd, buf, sizeof(buf));
|
|
close(fd);
|
|
CHECK_PERROR_RET(ret < 0 || ret >= sizeof(buf));
|
|
|
|
errno = 0;
|
|
ret = (int)strtol(buf, NULL, 10);
|
|
CHECK_PERROR_RET(errno);
|
|
return ret;
|
|
}
|
|
|
|
#define PMU_RETPROBE_FILE "/sys/bus/event_source/devices/%s/format/retprobe"
|
|
static int bpf_get_retprobe_bit(const char *event_type)
|
|
{
|
|
char buf[256];
|
|
int fd, ret;
|
|
|
|
ret = snprintf(buf, sizeof(buf), PMU_RETPROBE_FILE, event_type);
|
|
CHECK_PERROR_RET(ret < 0 || ret >= sizeof(buf));
|
|
|
|
fd = open(buf, O_RDONLY);
|
|
CHECK_PERROR_RET(fd < 0);
|
|
|
|
ret = read(fd, buf, sizeof(buf));
|
|
close(fd);
|
|
CHECK_PERROR_RET(ret < 0 || ret >= sizeof(buf));
|
|
CHECK_PERROR_RET(strlen(buf) < strlen("config:"));
|
|
|
|
errno = 0;
|
|
ret = (int)strtol(buf + strlen("config:"), NULL, 10);
|
|
CHECK_PERROR_RET(errno);
|
|
return ret;
|
|
}
|
|
|
|
static int test_debug_fs_kprobe(int prog_fd_idx, const char *fn_name,
|
|
__u32 expected_fd_type)
|
|
{
|
|
__u64 probe_offset, probe_addr;
|
|
__u32 len, prog_id, fd_type;
|
|
char buf[256];
|
|
int err;
|
|
|
|
len = sizeof(buf);
|
|
err = bpf_task_fd_query(getpid(), event_fd[prog_fd_idx], 0, buf, &len,
|
|
&prog_id, &fd_type, &probe_offset,
|
|
&probe_addr);
|
|
if (err < 0) {
|
|
printf("FAIL: %s, for event_fd idx %d, fn_name %s\n",
|
|
__func__, prog_fd_idx, fn_name);
|
|
perror(" :");
|
|
return -1;
|
|
}
|
|
if (strcmp(buf, fn_name) != 0 ||
|
|
fd_type != expected_fd_type ||
|
|
probe_offset != 0x0 || probe_addr != 0x0) {
|
|
printf("FAIL: bpf_trace_event_query(event_fd[%d]):\n",
|
|
prog_fd_idx);
|
|
printf("buf: %s, fd_type: %u, probe_offset: 0x%llx,"
|
|
" probe_addr: 0x%llx\n",
|
|
buf, fd_type, probe_offset, probe_addr);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int test_nondebug_fs_kuprobe_common(const char *event_type,
|
|
const char *name, __u64 offset, __u64 addr, bool is_return,
|
|
char *buf, __u32 *buf_len, __u32 *prog_id, __u32 *fd_type,
|
|
__u64 *probe_offset, __u64 *probe_addr)
|
|
{
|
|
int is_return_bit = bpf_get_retprobe_bit(event_type);
|
|
int type = bpf_find_probe_type(event_type);
|
|
struct perf_event_attr attr = {};
|
|
int fd;
|
|
|
|
if (type < 0 || is_return_bit < 0) {
|
|
printf("FAIL: %s incorrect type (%d) or is_return_bit (%d)\n",
|
|
__func__, type, is_return_bit);
|
|
return -1;
|
|
}
|
|
|
|
attr.sample_period = 1;
|
|
attr.wakeup_events = 1;
|
|
if (is_return)
|
|
attr.config |= 1 << is_return_bit;
|
|
|
|
if (name) {
|
|
attr.config1 = ptr_to_u64((void *)name);
|
|
attr.config2 = offset;
|
|
} else {
|
|
attr.config1 = 0;
|
|
attr.config2 = addr;
|
|
}
|
|
attr.size = sizeof(attr);
|
|
attr.type = type;
|
|
|
|
fd = sys_perf_event_open(&attr, -1, 0, -1, 0);
|
|
CHECK_PERROR_RET(fd < 0);
|
|
|
|
CHECK_PERROR_RET(ioctl(fd, PERF_EVENT_IOC_ENABLE, 0) < 0);
|
|
CHECK_PERROR_RET(ioctl(fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) < 0);
|
|
CHECK_PERROR_RET(bpf_task_fd_query(getpid(), fd, 0, buf, buf_len,
|
|
prog_id, fd_type, probe_offset, probe_addr) < 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int test_nondebug_fs_probe(const char *event_type, const char *name,
|
|
__u64 offset, __u64 addr, bool is_return,
|
|
__u32 expected_fd_type,
|
|
__u32 expected_ret_fd_type,
|
|
char *buf, __u32 buf_len)
|
|
{
|
|
__u64 probe_offset, probe_addr;
|
|
__u32 prog_id, fd_type;
|
|
int err;
|
|
|
|
err = test_nondebug_fs_kuprobe_common(event_type, name,
|
|
offset, addr, is_return,
|
|
buf, &buf_len, &prog_id,
|
|
&fd_type, &probe_offset,
|
|
&probe_addr);
|
|
if (err < 0) {
|
|
printf("FAIL: %s, "
|
|
"for name %s, offset 0x%llx, addr 0x%llx, is_return %d\n",
|
|
__func__, name ? name : "", offset, addr, is_return);
|
|
perror(" :");
|
|
return -1;
|
|
}
|
|
if ((is_return && fd_type != expected_ret_fd_type) ||
|
|
(!is_return && fd_type != expected_fd_type)) {
|
|
printf("FAIL: %s, incorrect fd_type %u\n",
|
|
__func__, fd_type);
|
|
return -1;
|
|
}
|
|
if (name) {
|
|
if (strcmp(name, buf) != 0) {
|
|
printf("FAIL: %s, incorrect buf %s\n", __func__, buf);
|
|
return -1;
|
|
}
|
|
if (probe_offset != offset) {
|
|
printf("FAIL: %s, incorrect probe_offset 0x%llx\n",
|
|
__func__, probe_offset);
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (buf_len != 0) {
|
|
printf("FAIL: %s, incorrect buf %p\n",
|
|
__func__, buf);
|
|
return -1;
|
|
}
|
|
|
|
if (probe_addr != addr) {
|
|
printf("FAIL: %s, incorrect probe_addr 0x%llx\n",
|
|
__func__, probe_addr);
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int test_debug_fs_uprobe(char *binary_path, long offset, bool is_return)
|
|
{
|
|
const char *event_type = "uprobe";
|
|
struct perf_event_attr attr = {};
|
|
char buf[256], event_alias[256];
|
|
__u64 probe_offset, probe_addr;
|
|
__u32 len, prog_id, fd_type;
|
|
int err, res, kfd, efd;
|
|
ssize_t bytes;
|
|
|
|
snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/%s_events",
|
|
event_type);
|
|
kfd = open(buf, O_WRONLY | O_APPEND, 0);
|
|
CHECK_PERROR_RET(kfd < 0);
|
|
|
|
res = snprintf(event_alias, sizeof(event_alias), "test_%d", getpid());
|
|
CHECK_PERROR_RET(res < 0 || res >= sizeof(event_alias));
|
|
|
|
res = snprintf(buf, sizeof(buf), "%c:%ss/%s %s:0x%lx",
|
|
is_return ? 'r' : 'p', event_type, event_alias,
|
|
binary_path, offset);
|
|
CHECK_PERROR_RET(res < 0 || res >= sizeof(buf));
|
|
CHECK_PERROR_RET(write(kfd, buf, strlen(buf)) < 0);
|
|
|
|
close(kfd);
|
|
kfd = -1;
|
|
|
|
snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id",
|
|
event_type, event_alias);
|
|
efd = open(buf, O_RDONLY, 0);
|
|
CHECK_PERROR_RET(efd < 0);
|
|
|
|
bytes = read(efd, buf, sizeof(buf));
|
|
CHECK_PERROR_RET(bytes <= 0 || bytes >= sizeof(buf));
|
|
close(efd);
|
|
buf[bytes] = '\0';
|
|
|
|
attr.config = strtol(buf, NULL, 0);
|
|
attr.type = PERF_TYPE_TRACEPOINT;
|
|
attr.sample_period = 1;
|
|
attr.wakeup_events = 1;
|
|
kfd = sys_perf_event_open(&attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC);
|
|
CHECK_PERROR_RET(kfd < 0);
|
|
CHECK_PERROR_RET(ioctl(kfd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) < 0);
|
|
CHECK_PERROR_RET(ioctl(kfd, PERF_EVENT_IOC_ENABLE, 0) < 0);
|
|
|
|
len = sizeof(buf);
|
|
err = bpf_task_fd_query(getpid(), kfd, 0, buf, &len,
|
|
&prog_id, &fd_type, &probe_offset,
|
|
&probe_addr);
|
|
if (err < 0) {
|
|
printf("FAIL: %s, binary_path %s\n", __func__, binary_path);
|
|
perror(" :");
|
|
return -1;
|
|
}
|
|
if ((is_return && fd_type != BPF_FD_TYPE_URETPROBE) ||
|
|
(!is_return && fd_type != BPF_FD_TYPE_UPROBE)) {
|
|
printf("FAIL: %s, incorrect fd_type %u\n", __func__,
|
|
fd_type);
|
|
return -1;
|
|
}
|
|
if (strcmp(binary_path, buf) != 0) {
|
|
printf("FAIL: %s, incorrect buf %s\n", __func__, buf);
|
|
return -1;
|
|
}
|
|
if (probe_offset != offset) {
|
|
printf("FAIL: %s, incorrect probe_offset 0x%llx\n", __func__,
|
|
probe_offset);
|
|
return -1;
|
|
}
|
|
|
|
close(kfd);
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct rlimit r = {1024*1024, RLIM_INFINITY};
|
|
extern char __executable_start;
|
|
char filename[256], buf[256];
|
|
__u64 uprobe_file_offset;
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
|
|
perror("setrlimit(RLIMIT_MEMLOCK)");
|
|
return 1;
|
|
}
|
|
|
|
if (load_kallsyms()) {
|
|
printf("failed to process /proc/kallsyms\n");
|
|
return 1;
|
|
}
|
|
|
|
if (load_bpf_file(filename)) {
|
|
printf("%s", bpf_log_buf);
|
|
return 1;
|
|
}
|
|
|
|
/* test two functions in the corresponding *_kern.c file */
|
|
CHECK_AND_RET(test_debug_fs_kprobe(0, "blk_start_request",
|
|
BPF_FD_TYPE_KPROBE));
|
|
CHECK_AND_RET(test_debug_fs_kprobe(1, "blk_account_io_completion",
|
|
BPF_FD_TYPE_KRETPROBE));
|
|
|
|
/* test nondebug fs kprobe */
|
|
CHECK_AND_RET(test_nondebug_fs_probe("kprobe", "bpf_check", 0x0, 0x0,
|
|
false, BPF_FD_TYPE_KPROBE,
|
|
BPF_FD_TYPE_KRETPROBE,
|
|
buf, sizeof(buf)));
|
|
#ifdef __x86_64__
|
|
/* set a kprobe on "bpf_check + 0x5", which is x64 specific */
|
|
CHECK_AND_RET(test_nondebug_fs_probe("kprobe", "bpf_check", 0x5, 0x0,
|
|
false, BPF_FD_TYPE_KPROBE,
|
|
BPF_FD_TYPE_KRETPROBE,
|
|
buf, sizeof(buf)));
|
|
#endif
|
|
CHECK_AND_RET(test_nondebug_fs_probe("kprobe", "bpf_check", 0x0, 0x0,
|
|
true, BPF_FD_TYPE_KPROBE,
|
|
BPF_FD_TYPE_KRETPROBE,
|
|
buf, sizeof(buf)));
|
|
CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
|
|
ksym_get_addr("bpf_check"), false,
|
|
BPF_FD_TYPE_KPROBE,
|
|
BPF_FD_TYPE_KRETPROBE,
|
|
buf, sizeof(buf)));
|
|
CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
|
|
ksym_get_addr("bpf_check"), false,
|
|
BPF_FD_TYPE_KPROBE,
|
|
BPF_FD_TYPE_KRETPROBE,
|
|
NULL, 0));
|
|
CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
|
|
ksym_get_addr("bpf_check"), true,
|
|
BPF_FD_TYPE_KPROBE,
|
|
BPF_FD_TYPE_KRETPROBE,
|
|
buf, sizeof(buf)));
|
|
CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
|
|
ksym_get_addr("bpf_check"), true,
|
|
BPF_FD_TYPE_KPROBE,
|
|
BPF_FD_TYPE_KRETPROBE,
|
|
0, 0));
|
|
|
|
/* test nondebug fs uprobe */
|
|
/* the calculation of uprobe file offset is based on gcc 7.3.1 on x64
|
|
* and the default linker script, which defines __executable_start as
|
|
* the start of the .text section. The calculation could be different
|
|
* on different systems with different compilers. The right way is
|
|
* to parse the ELF file. We took a shortcut here.
|
|
*/
|
|
uprobe_file_offset = (__u64)main - (__u64)&__executable_start;
|
|
CHECK_AND_RET(test_nondebug_fs_probe("uprobe", (char *)argv[0],
|
|
uprobe_file_offset, 0x0, false,
|
|
BPF_FD_TYPE_UPROBE,
|
|
BPF_FD_TYPE_URETPROBE,
|
|
buf, sizeof(buf)));
|
|
CHECK_AND_RET(test_nondebug_fs_probe("uprobe", (char *)argv[0],
|
|
uprobe_file_offset, 0x0, true,
|
|
BPF_FD_TYPE_UPROBE,
|
|
BPF_FD_TYPE_URETPROBE,
|
|
buf, sizeof(buf)));
|
|
|
|
/* test debug fs uprobe */
|
|
CHECK_AND_RET(test_debug_fs_uprobe((char *)argv[0], uprobe_file_offset,
|
|
false));
|
|
CHECK_AND_RET(test_debug_fs_uprobe((char *)argv[0], uprobe_file_offset,
|
|
true));
|
|
|
|
return 0;
|
|
}
|