1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Google LLC. */
3 
4 #include <test_progs.h>
5 #include "test_snprintf.skel.h"
6 #include "test_snprintf_single.skel.h"
7 
8 #define EXP_NUM_OUT  "-8 9 96 -424242 1337 DABBAD00"
9 #define EXP_NUM_RET  sizeof(EXP_NUM_OUT)
10 
11 #define EXP_IP_OUT   "127.000.000.001 0000:0000:0000:0000:0000:0000:0000:0001"
12 #define EXP_IP_RET   sizeof(EXP_IP_OUT)
13 
14 /* The third specifier, %pB, depends on compiler inlining so don't check it */
15 #define EXP_SYM_OUT  "schedule schedule+0x0/"
16 #define MIN_SYM_RET  sizeof(EXP_SYM_OUT)
17 
18 /* The third specifier, %p, is a hashed pointer which changes on every reboot */
19 #define EXP_ADDR_OUT "0000000000000000 ffff00000add4e55 "
20 #define EXP_ADDR_RET sizeof(EXP_ADDR_OUT "unknownhashedptr")
21 
22 #define EXP_STR_OUT  "str1 longstr"
23 #define EXP_STR_RET  sizeof(EXP_STR_OUT)
24 
25 #define EXP_OVER_OUT "%over"
26 #define EXP_OVER_RET 10
27 
28 #define EXP_PAD_OUT "    4 000"
29 #define EXP_PAD_RET 900007
30 
31 #define EXP_NO_ARG_OUT "simple case"
32 #define EXP_NO_ARG_RET 12
33 
34 #define EXP_NO_BUF_RET 29
35 
36 void test_snprintf_positive(void)
37 {
38 	char exp_addr_out[] = EXP_ADDR_OUT;
39 	char exp_sym_out[]  = EXP_SYM_OUT;
40 	struct test_snprintf *skel;
41 
42 	skel = test_snprintf__open_and_load();
43 	if (!ASSERT_OK_PTR(skel, "skel_open"))
44 		return;
45 
46 	skel->bss->pid = getpid();
47 
48 	if (!ASSERT_OK(test_snprintf__attach(skel), "skel_attach"))
49 		goto cleanup;
50 
51 	/* trigger tracepoint */
52 	usleep(1);
53 
54 	ASSERT_STREQ(skel->bss->num_out, EXP_NUM_OUT, "num_out");
55 	ASSERT_EQ(skel->bss->num_ret, EXP_NUM_RET, "num_ret");
56 
57 	ASSERT_STREQ(skel->bss->ip_out, EXP_IP_OUT, "ip_out");
58 	ASSERT_EQ(skel->bss->ip_ret, EXP_IP_RET, "ip_ret");
59 
60 	ASSERT_OK(memcmp(skel->bss->sym_out, exp_sym_out,
61 			 sizeof(exp_sym_out) - 1), "sym_out");
62 	ASSERT_LT(MIN_SYM_RET, skel->bss->sym_ret, "sym_ret");
63 
64 	ASSERT_OK(memcmp(skel->bss->addr_out, exp_addr_out,
65 			 sizeof(exp_addr_out) - 1), "addr_out");
66 	ASSERT_EQ(skel->bss->addr_ret, EXP_ADDR_RET, "addr_ret");
67 
68 	ASSERT_STREQ(skel->bss->str_out, EXP_STR_OUT, "str_out");
69 	ASSERT_EQ(skel->bss->str_ret, EXP_STR_RET, "str_ret");
70 
71 	ASSERT_STREQ(skel->bss->over_out, EXP_OVER_OUT, "over_out");
72 	ASSERT_EQ(skel->bss->over_ret, EXP_OVER_RET, "over_ret");
73 
74 	ASSERT_STREQ(skel->bss->pad_out, EXP_PAD_OUT, "pad_out");
75 	ASSERT_EQ(skel->bss->pad_ret, EXP_PAD_RET, "pad_ret");
76 
77 	ASSERT_STREQ(skel->bss->noarg_out, EXP_NO_ARG_OUT, "no_arg_out");
78 	ASSERT_EQ(skel->bss->noarg_ret, EXP_NO_ARG_RET, "no_arg_ret");
79 
80 	ASSERT_EQ(skel->bss->nobuf_ret, EXP_NO_BUF_RET, "no_buf_ret");
81 
82 cleanup:
83 	test_snprintf__destroy(skel);
84 }
85 
86 #define min(a, b) ((a) < (b) ? (a) : (b))
87 
88 /* Loads an eBPF object calling bpf_snprintf with up to 10 characters of fmt */
89 static int load_single_snprintf(char *fmt)
90 {
91 	struct test_snprintf_single *skel;
92 	int ret;
93 
94 	skel = test_snprintf_single__open();
95 	if (!skel)
96 		return -EINVAL;
97 
98 	memcpy(skel->rodata->fmt, fmt, min(strlen(fmt) + 1, 10));
99 
100 	ret = test_snprintf_single__load(skel);
101 	test_snprintf_single__destroy(skel);
102 
103 	return ret;
104 }
105 
106 void test_snprintf_negative(void)
107 {
108 	ASSERT_OK(load_single_snprintf("valid %d"), "valid usage");
109 
110 	ASSERT_ERR(load_single_snprintf("0123456789"), "no terminating zero");
111 	ASSERT_ERR(load_single_snprintf("%d %d"), "too many specifiers");
112 	ASSERT_ERR(load_single_snprintf("%pi5"), "invalid specifier 1");
113 	ASSERT_ERR(load_single_snprintf("%a"), "invalid specifier 2");
114 	ASSERT_ERR(load_single_snprintf("%"), "invalid specifier 3");
115 	ASSERT_ERR(load_single_snprintf("%12345678"), "invalid specifier 4");
116 	ASSERT_ERR(load_single_snprintf("%--------"), "invalid specifier 5");
117 	ASSERT_ERR(load_single_snprintf("\x80"), "non ascii character");
118 	ASSERT_ERR(load_single_snprintf("\x1"), "non printable character");
119 }
120 
121 void test_snprintf(void)
122 {
123 	if (test__start_subtest("snprintf_positive"))
124 		test_snprintf_positive();
125 	if (test__start_subtest("snprintf_negative"))
126 		test_snprintf_negative();
127 }
128