[linux-2.6-block.git] / samples / bpf / task_fd_query_user.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[sizeof("test_1234567890")];
	__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_mq_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;
}
Commit	Line	Data
ecb96f7f YS	1	// SPDX-License-Identifier: GPL-2.0
	2
	3	#include <stdio.h>
	4	#include <stdlib.h>
	5	#include <signal.h>
	6	#include <unistd.h>
	7	#include <stdbool.h>
	8	#include <string.h>
	9	#include <stdint.h>
	10	#include <fcntl.h>
	11	#include <linux/bpf.h>
	12	#include <sys/ioctl.h>
	13	#include <sys/resource.h>
	14	#include <sys/types.h>
	15	#include <sys/stat.h>
	16
	17	#include "libbpf.h"
	18	#include "bpf_load.h"
	19	#include "bpf_util.h"
	20	#include "perf-sys.h"
	21	#include "trace_helpers.h"
	22
	23	#define CHECK_PERROR_RET(condition) ({ \
	24	int __ret = !!(condition); \
	25	if (__ret) { \
	26	printf("FAIL: %s:\n", __func__); \
	27	perror(" "); \
	28	return -1; \
	29	} \
	30	})
	31
	32	#define CHECK_AND_RET(condition) ({ \
	33	int __ret = !!(condition); \
	34	if (__ret) \
	35	return -1; \
	36	})
	37
	38	static __u64 ptr_to_u64(void *ptr)
	39	{
	40	return (__u64) (unsigned long) ptr;
	41	}
	42
	43	#define PMU_TYPE_FILE "/sys/bus/event_source/devices/%s/type"
	44	static int bpf_find_probe_type(const char *event_type)
	45	{
	46	char buf[256];
	47	int fd, ret;
	48
	49	ret = snprintf(buf, sizeof(buf), PMU_TYPE_FILE, event_type);
	50	CHECK_PERROR_RET(ret < 0 \|\| ret >= sizeof(buf));
	51
	52	fd = open(buf, O_RDONLY);
	53	CHECK_PERROR_RET(fd < 0);
	54
	55	ret = read(fd, buf, sizeof(buf));
	56	close(fd);
	57	CHECK_PERROR_RET(ret < 0 \|\| ret >= sizeof(buf));
	58
	59	errno = 0;
	60	ret = (int)strtol(buf, NULL, 10);
	61	CHECK_PERROR_RET(errno);
	62	return ret;
	63	}
	64
65	#define PMU_RETPROBE_FILE "/sys/bus/event_source/devices/%s/format/retprobe"
66	static int bpf_get_retprobe_bit(const char *event_type)
67	{
68	char buf[256];
69	int fd, ret;
70
71	ret = snprintf(buf, sizeof(buf), PMU_RETPROBE_FILE, event_type);
72	CHECK_PERROR_RET(ret < 0 \|\| ret >= sizeof(buf));
73
74	fd = open(buf, O_RDONLY);
75	CHECK_PERROR_RET(fd < 0);
76
77	ret = read(fd, buf, sizeof(buf));
78	close(fd);
79	CHECK_PERROR_RET(ret < 0 \|\| ret >= sizeof(buf));
80	CHECK_PERROR_RET(strlen(buf) < strlen("config:"));
81
82	errno = 0;
83	ret = (int)strtol(buf + strlen("config:"), NULL, 10);
84	CHECK_PERROR_RET(errno);
85	return ret;
86	}
87
88	static int test_debug_fs_kprobe(int prog_fd_idx, const char *fn_name,
89	__u32 expected_fd_type)
90	{
91	__u64 probe_offset, probe_addr;
92	__u32 len, prog_id, fd_type;
93	char buf[256];
94	int err;
95
96	len = sizeof(buf);
97	err = bpf_task_fd_query(getpid(), event_fd[prog_fd_idx], 0, buf, &len,
98	&prog_id, &fd_type, &probe_offset,
99	&probe_addr);
100	if (err < 0) {
101	printf("FAIL: %s, for event_fd idx %d, fn_name %s\n",
102	__func__, prog_fd_idx, fn_name);
103	perror(" :");
104	return -1;
105	}
106	if (strcmp(buf, fn_name) != 0 \|\|
107	fd_type != expected_fd_type \|\|
108	probe_offset != 0x0 \|\| probe_addr != 0x0) {
109	printf("FAIL: bpf_trace_event_query(event_fd[%d]):\n",
110	prog_fd_idx);
111	printf("buf: %s, fd_type: %u, probe_offset: 0x%llx,"
112	" probe_addr: 0x%llx\n",
113	buf, fd_type, probe_offset, probe_addr);
114	return -1;
115	}
116	return 0;
117	}
118
119	static int test_nondebug_fs_kuprobe_common(const char *event_type,
120	const char *name, __u64 offset, __u64 addr, bool is_return,
121	char buf, __u32 buf_len, __u32 prog_id, __u32 fd_type,
122	__u64 probe_offset, __u64 probe_addr)
123	{
124	int is_return_bit = bpf_get_retprobe_bit(event_type);
125	int type = bpf_find_probe_type(event_type);
126	struct perf_event_attr attr = {};
127	int fd;
128
129	if (type < 0 \|\| is_return_bit < 0) {
130	printf("FAIL: %s incorrect type (%d) or is_return_bit (%d)\n",
131	__func__, type, is_return_bit);
132	return -1;
133	}
134
135	attr.sample_period = 1;
136	attr.wakeup_events = 1;
137	if (is_return)
138	attr.config \|= 1 << is_return_bit;
139
140	if (name) {
141	attr.config1 = ptr_to_u64((void *)name);
142	attr.config2 = offset;
143	} else {
144	attr.config1 = 0;
145	attr.config2 = addr;
146	}
147	attr.size = sizeof(attr);
148	attr.type = type;
149
150	fd = sys_perf_event_open(&attr, -1, 0, -1, 0);
151	CHECK_PERROR_RET(fd < 0);
152
153	CHECK_PERROR_RET(ioctl(fd, PERF_EVENT_IOC_ENABLE, 0) < 0);
154	CHECK_PERROR_RET(ioctl(fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) < 0);
155	CHECK_PERROR_RET(bpf_task_fd_query(getpid(), fd, 0, buf, buf_len,
156	prog_id, fd_type, probe_offset, probe_addr) < 0);
157
158	return 0;
159	}
160
161	static int test_nondebug_fs_probe(const char event_type, const char name,
162	__u64 offset, __u64 addr, bool is_return,
163	__u32 expected_fd_type,
164	__u32 expected_ret_fd_type,
165	char *buf, __u32 buf_len)
166	{
167	__u64 probe_offset, probe_addr;
168	__u32 prog_id, fd_type;
169	int err;
170
171	err = test_nondebug_fs_kuprobe_common(event_type, name,
172	offset, addr, is_return,
173	buf, &buf_len, &prog_id,
174	&fd_type, &probe_offset,
175	&probe_addr);
176	if (err < 0) {
177	printf("FAIL: %s, "
178	"for name %s, offset 0x%llx, addr 0x%llx, is_return %d\n",
179	__func__, name ? name : "", offset, addr, is_return);
180	perror(" :");
181	return -1;
182	}
183	if ((is_return && fd_type != expected_ret_fd_type) \|\|
184	(!is_return && fd_type != expected_fd_type)) {
185	printf("FAIL: %s, incorrect fd_type %u\n",
186	__func__, fd_type);
187	return -1;
188	}
189	if (name) {
190	if (strcmp(name, buf) != 0) {
191	printf("FAIL: %s, incorrect buf %s\n", __func__, buf);
192	return -1;
193	}
194	if (probe_offset != offset) {
195	printf("FAIL: %s, incorrect probe_offset 0x%llx\n",
196	__func__, probe_offset);
197	return -1;
198	}
199	} else {
200	if (buf_len != 0) {
201	printf("FAIL: %s, incorrect buf %p\n",
202	__func__, buf);
203	return -1;
204	}
205
206	if (probe_addr != addr) {
207	printf("FAIL: %s, incorrect probe_addr 0x%llx\n",
208	__func__, probe_addr);
209	return -1;
210	}
211	}
212	return 0;
213	}
214
215	static int test_debug_fs_uprobe(char *binary_path, long offset, bool is_return)
216	{
217	const char *event_type = "uprobe";
218	struct perf_event_attr attr = {};
a195ceff	219	char buf[256], event_alias[sizeof("test_1234567890")];
ecb96f7f YS	220	__u64 probe_offset, probe_addr;
	221	__u32 len, prog_id, fd_type;
	222	int err, res, kfd, efd;
	223	ssize_t bytes;
	224
	225	snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/%s_events",
	226	event_type);
	227	kfd = open(buf, O_WRONLY \| O_APPEND, 0);
	228	CHECK_PERROR_RET(kfd < 0);
	229
	230	res = snprintf(event_alias, sizeof(event_alias), "test_%d", getpid());
	231	CHECK_PERROR_RET(res < 0 \|\| res >= sizeof(event_alias));
	232
	233	res = snprintf(buf, sizeof(buf), "%c:%ss/%s %s:0x%lx",
	234	is_return ? 'r' : 'p', event_type, event_alias,
	235	binary_path, offset);
	236	CHECK_PERROR_RET(res < 0 \|\| res >= sizeof(buf));
	237	CHECK_PERROR_RET(write(kfd, buf, strlen(buf)) < 0);
	238
	239	close(kfd);
	240	kfd = -1;
	241
	242	snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id",
	243	event_type, event_alias);
	244	efd = open(buf, O_RDONLY, 0);
	245	CHECK_PERROR_RET(efd < 0);
	246
	247	bytes = read(efd, buf, sizeof(buf));
	248	CHECK_PERROR_RET(bytes <= 0 \|\| bytes >= sizeof(buf));
	249	close(efd);
	250	buf[bytes] = '\0';
	251
	252	attr.config = strtol(buf, NULL, 0);
	253	attr.type = PERF_TYPE_TRACEPOINT;
	254	attr.sample_period = 1;
	255	attr.wakeup_events = 1;
	256	kfd = sys_perf_event_open(&attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC);
	257	CHECK_PERROR_RET(kfd < 0);
	258	CHECK_PERROR_RET(ioctl(kfd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) < 0);
	259	CHECK_PERROR_RET(ioctl(kfd, PERF_EVENT_IOC_ENABLE, 0) < 0);
	260
	261	len = sizeof(buf);
	262	err = bpf_task_fd_query(getpid(), kfd, 0, buf, &len,
	263	&prog_id, &fd_type, &probe_offset,
	264	&probe_addr);
	265	if (err < 0) {
	266	printf("FAIL: %s, binary_path %s\n", __func__, binary_path);
	267	perror(" :");
	268	return -1;
	269	}
	270	if ((is_return && fd_type != BPF_FD_TYPE_URETPROBE) \|\|
	271	(!is_return && fd_type != BPF_FD_TYPE_UPROBE)) {
	272	printf("FAIL: %s, incorrect fd_type %u\n", __func__,
	273	fd_type);
	274	return -1;
	275	}
	276	if (strcmp(binary_path, buf) != 0) {
	277	printf("FAIL: %s, incorrect buf %s\n", __func__, buf);
	278	return -1;
	279	}
	280	if (probe_offset != offset) {
	281	printf("FAIL: %s, incorrect probe_offset 0x%llx\n", __func__,
	282	probe_offset);
	283	return -1;
284	}
285
286	close(kfd);
287	return 0;
288	}
289
290	int main(int argc, char **argv)
291	{
292	struct rlimit r = {1024*1024, RLIM_INFINITY};
293	extern char __executable_start;
294	char filename[256], buf[256];
295	__u64 uprobe_file_offset;
296
297	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
298	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
299	perror("setrlimit(RLIMIT_MEMLOCK)");
300	return 1;
301	}
302
303	if (load_kallsyms()) {
304	printf("failed to process /proc/kallsyms\n");
305	return 1;
306	}
307
308	if (load_bpf_file(filename)) {
309	printf("%s", bpf_log_buf);
310	return 1;
311	}
312
313	/* test two functions in the corresponding _kern.c file /
d2e614cb	314	CHECK_AND_RET(test_debug_fs_kprobe(0, "blk_mq_start_request",
ecb96f7f YS	315	BPF_FD_TYPE_KPROBE));
	316	CHECK_AND_RET(test_debug_fs_kprobe(1, "blk_account_io_completion",
	317	BPF_FD_TYPE_KRETPROBE));
	318
	319	/* test nondebug fs kprobe */
	320	CHECK_AND_RET(test_nondebug_fs_probe("kprobe", "bpf_check", 0x0, 0x0,
	321	false, BPF_FD_TYPE_KPROBE,
	322	BPF_FD_TYPE_KRETPROBE,
	323	buf, sizeof(buf)));
	324	#ifdef __x86_64__
	325	/* set a kprobe on "bpf_check + 0x5", which is x64 specific */
	326	CHECK_AND_RET(test_nondebug_fs_probe("kprobe", "bpf_check", 0x5, 0x0,
	327	false, BPF_FD_TYPE_KPROBE,
	328	BPF_FD_TYPE_KRETPROBE,
	329	buf, sizeof(buf)));
	330	#endif
	331	CHECK_AND_RET(test_nondebug_fs_probe("kprobe", "bpf_check", 0x0, 0x0,
	332	true, BPF_FD_TYPE_KPROBE,
	333	BPF_FD_TYPE_KRETPROBE,
	334	buf, sizeof(buf)));
	335	CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
	336	ksym_get_addr("bpf_check"), false,
	337	BPF_FD_TYPE_KPROBE,
	338	BPF_FD_TYPE_KRETPROBE,
	339	buf, sizeof(buf)));
	340	CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
	341	ksym_get_addr("bpf_check"), false,
	342	BPF_FD_TYPE_KPROBE,
	343	BPF_FD_TYPE_KRETPROBE,
	344	NULL, 0));
	345	CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
	346	ksym_get_addr("bpf_check"), true,
	347	BPF_FD_TYPE_KPROBE,
	348	BPF_FD_TYPE_KRETPROBE,
	349	buf, sizeof(buf)));
	350	CHECK_AND_RET(test_nondebug_fs_probe("kprobe", NULL, 0x0,
	351	ksym_get_addr("bpf_check"), true,
	352	BPF_FD_TYPE_KPROBE,
	353	BPF_FD_TYPE_KRETPROBE,
	354	0, 0));
	355
	356	/* test nondebug fs uprobe */
	357	/* the calculation of uprobe file offset is based on gcc 7.3.1 on x64
	358	* and the default linker script, which defines __executable_start as
	359	* the start of the .text section. The calculation could be different
	360	* on different systems with different compilers. The right way is
	361	* to parse the ELF file. We took a shortcut here.
	362	*/
	363	uprobe_file_offset = (__u64)main - (__u64)&__executable_start;
	364	CHECK_AND_RET(test_nondebug_fs_probe("uprobe", (char *)argv[0],
	365	uprobe_file_offset, 0x0, false,
	366	BPF_FD_TYPE_UPROBE,
	367	BPF_FD_TYPE_URETPROBE,
	368	buf, sizeof(buf)));
	369	CHECK_AND_RET(test_nondebug_fs_probe("uprobe", (char *)argv[0],
	370	uprobe_file_offset, 0x0, true,
	371	BPF_FD_TYPE_UPROBE,
	372	BPF_FD_TYPE_URETPROBE,
	373	buf, sizeof(buf)));
	374
	375	/* test debug fs uprobe */
	376	CHECK_AND_RET(test_debug_fs_uprobe((char *)argv[0], uprobe_file_offset,
	377	false));
	378	CHECK_AND_RET(test_debug_fs_uprobe((char *)argv[0], uprobe_file_offset,
379	true));
380
381	return 0;
382	}