1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include <network_helpers.h>
#include "file_reader.skel.h"
#include "file_reader_fail.skel.h"
#include <dlfcn.h>
#include <sys/mman.h>
#include <sys/stat.h>
const char *user_ptr = "hello world";
char file_contents[256000];
void *addr;
__u64 beyond_eof_offset;
void *get_executable_base_addr(void)
{
Dl_info info;
if (!dladdr((void *)&get_executable_base_addr, &info)) {
fprintf(stderr, "dladdr failed\n");
return NULL;
}
return info.dli_fbase;
}
static int initialize_file_contents(void)
{
struct stat st;
int fd, page_sz = sysconf(_SC_PAGESIZE);
ssize_t n = 0, cur;
fd = open("/proc/self/exe", O_RDONLY);
if (!ASSERT_OK_FD(fd, "Open /proc/self/exe\n"))
return 1;
if (!ASSERT_OK(fstat(fd, &st), "fstat /proc/self/exe")) {
close(fd);
return 1;
}
beyond_eof_offset = st.st_size + (1ULL << 30);
do {
cur = read(fd, file_contents + n, sizeof(file_contents) - n);
if (!ASSERT_GT(cur, 0, "read success"))
break;
n += cur;
} while (n < sizeof(file_contents));
close(fd);
if (!ASSERT_EQ(n, sizeof(file_contents), "Read /proc/self/exe\n"))
return 1;
addr = get_executable_base_addr();
if (!ASSERT_NEQ(addr, NULL, "get executable address"))
return 1;
/* page-align base file address */
addr = (void *)((unsigned long)addr & ~(page_sz - 1));
return 0;
}
static void run_test(const char *prog_name)
{
struct file_reader *skel;
struct bpf_program *prog;
int err, fd;
err = initialize_file_contents();
if (!ASSERT_OK(err, "initialize file contents"))
return;
skel = file_reader__open();
if (!ASSERT_OK_PTR(skel, "file_reader__open"))
return;
bpf_object__for_each_program(prog, skel->obj) {
bpf_program__set_autoload(prog, strcmp(bpf_program__name(prog), prog_name) == 0);
}
memcpy(skel->bss->user_buf, file_contents, sizeof(file_contents));
skel->bss->pid = getpid();
skel->bss->beyond_eof_offset = beyond_eof_offset;
err = file_reader__load(skel);
if (!ASSERT_OK(err, "file_reader__load"))
goto cleanup;
/*
* Page out range 0..512K, use 0..256K for positive tests and
* 256K..512K for negative tests expecting page faults
*/
if (!ASSERT_OK(madvise(addr, sizeof(file_contents) * 2, MADV_PAGEOUT),
"madvise pageout"))
goto cleanup;
err = file_reader__attach(skel);
if (!ASSERT_OK(err, "file_reader__attach"))
goto cleanup;
fd = open("/proc/self/exe", O_RDONLY);
if (fd >= 0)
close(fd);
ASSERT_EQ(skel->bss->err, 0, "err");
ASSERT_EQ(skel->bss->run_success, 1, "run_success");
cleanup:
file_reader__destroy(skel);
}
void test_file_reader(void)
{
if (test__start_subtest("on_open_expect_fault"))
run_test("on_open_expect_fault");
if (test__start_subtest("on_open_validate_file_read"))
run_test("on_open_validate_file_read");
if (test__start_subtest("on_open_non_sleepable_first"))
run_test("on_open_non_sleepable_first");
if (test__start_subtest("on_open_sleepable_first"))
run_test("on_open_sleepable_first");
if (test__start_subtest("negative"))
RUN_TESTS(file_reader_fail);
}
|
