tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2022 Facebook */
3
4#include <test_progs.h>
5#include "dynptr_fail.skel.h"
6#include "dynptr_success.skel.h"
7
8static size_t log_buf_sz = 1048576; /* 1 MB */
9static char obj_log_buf[1048576];
10
11static struct {
12 const char *prog_name;
13 const char *expected_err_msg;
14} dynptr_tests[] = {
15 /* failure cases */
16 {"ringbuf_missing_release1", "Unreleased reference id=1"},
17 {"ringbuf_missing_release2", "Unreleased reference id=2"},
18 {"ringbuf_missing_release_callback", "Unreleased reference id"},
19 {"use_after_invalid", "Expected an initialized dynptr as arg #3"},
20 {"ringbuf_invalid_api", "type=mem expected=alloc_mem"},
21 {"add_dynptr_to_map1", "invalid indirect read from stack"},
22 {"add_dynptr_to_map2", "invalid indirect read from stack"},
23 {"data_slice_out_of_bounds_ringbuf", "value is outside of the allowed memory range"},
24 {"data_slice_out_of_bounds_map_value", "value is outside of the allowed memory range"},
25 {"data_slice_use_after_release", "invalid mem access 'scalar'"},
26 {"data_slice_missing_null_check1", "invalid mem access 'mem_or_null'"},
27 {"data_slice_missing_null_check2", "invalid mem access 'mem_or_null'"},
28 {"invalid_helper1", "invalid indirect read from stack"},
29 {"invalid_helper2", "Expected an initialized dynptr as arg #3"},
30 {"invalid_write1", "Expected an initialized dynptr as arg #1"},
31 {"invalid_write2", "Expected an initialized dynptr as arg #3"},
32 {"invalid_write3", "Expected an initialized ringbuf dynptr as arg #1"},
33 {"invalid_write4", "arg 1 is an unacquired reference"},
34 {"invalid_read1", "invalid read from stack"},
35 {"invalid_read2", "cannot pass in dynptr at an offset"},
36 {"invalid_read3", "invalid read from stack"},
37 {"invalid_read4", "invalid read from stack"},
38 {"invalid_offset", "invalid write to stack"},
39 {"global", "type=map_value expected=fp"},
40 {"release_twice", "arg 1 is an unacquired reference"},
41 {"release_twice_callback", "arg 1 is an unacquired reference"},
42 {"dynptr_from_mem_invalid_api",
43 "Unsupported reg type fp for bpf_dynptr_from_mem data"},
44
45 /* success cases */
46 {"test_read_write", NULL},
47 {"test_data_slice", NULL},
48 {"test_ringbuf", NULL},
49};
50
51static void verify_fail(const char *prog_name, const char *expected_err_msg)
52{
53 LIBBPF_OPTS(bpf_object_open_opts, opts);
54 struct bpf_program *prog;
55 struct dynptr_fail *skel;
56 int err;
57
58 opts.kernel_log_buf = obj_log_buf;
59 opts.kernel_log_size = log_buf_sz;
60 opts.kernel_log_level = 1;
61
62 skel = dynptr_fail__open_opts(&opts);
63 if (!ASSERT_OK_PTR(skel, "dynptr_fail__open_opts"))
64 goto cleanup;
65
66 prog = bpf_object__find_program_by_name(skel->obj, prog_name);
67 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
68 goto cleanup;
69
70 bpf_program__set_autoload(prog, true);
71
72 bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
73
74 err = dynptr_fail__load(skel);
75 if (!ASSERT_ERR(err, "unexpected load success"))
76 goto cleanup;
77
78 if (!ASSERT_OK_PTR(strstr(obj_log_buf, expected_err_msg), "expected_err_msg")) {
79 fprintf(stderr, "Expected err_msg: %s\n", expected_err_msg);
80 fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
81 }
82
83cleanup:
84 dynptr_fail__destroy(skel);
85}
86
87static void verify_success(const char *prog_name)
88{
89 struct dynptr_success *skel;
90 struct bpf_program *prog;
91 struct bpf_link *link;
92
93 skel = dynptr_success__open();
94 if (!ASSERT_OK_PTR(skel, "dynptr_success__open"))
95 return;
96
97 skel->bss->pid = getpid();
98
99 bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
100
101 dynptr_success__load(skel);
102 if (!ASSERT_OK_PTR(skel, "dynptr_success__load"))
103 goto cleanup;
104
105 prog = bpf_object__find_program_by_name(skel->obj, prog_name);
106 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
107 goto cleanup;
108
109 link = bpf_program__attach(prog);
110 if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
111 goto cleanup;
112
113 usleep(1);
114
115 ASSERT_EQ(skel->bss->err, 0, "err");
116
117 bpf_link__destroy(link);
118
119cleanup:
120 dynptr_success__destroy(skel);
121}
122
123void test_dynptr(void)
124{
125 int i;
126
127 for (i = 0; i < ARRAY_SIZE(dynptr_tests); i++) {
128 if (!test__start_subtest(dynptr_tests[i].prog_name))
129 continue;
130
131 if (dynptr_tests[i].expected_err_msg)
132 verify_fail(dynptr_tests[i].prog_name,
133 dynptr_tests[i].expected_err_msg);
134 else
135 verify_success(dynptr_tests[i].prog_name);
136 }
137}