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 a b c d e 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 static 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 /* Loads an eBPF object calling bpf_snprintf with up to 10 characters of fmt */
87 static int load_single_snprintf(char *fmt)
88 {
89 struct test_snprintf_single *skel;
90 int ret;
91
92 skel = test_snprintf_single__open();
93 if (!skel)
94 return -EINVAL;
95
96 memcpy(skel->rodata->fmt, fmt, MIN(strlen(fmt) + 1, 10));
97
98 ret = test_snprintf_single__load(skel);
99 test_snprintf_single__destroy(skel);
100
101 return ret;
102 }
103
104 static void test_snprintf_negative(void)
105 {
106 ASSERT_OK(load_single_snprintf("valid %d"), "valid usage");
107
108 ASSERT_ERR(load_single_snprintf("0123456789"), "no terminating zero");
109 ASSERT_ERR(load_single_snprintf("%d %d"), "too many specifiers");
110 ASSERT_ERR(load_single_snprintf("%pi5"), "invalid specifier 1");
111 ASSERT_ERR(load_single_snprintf("%a"), "invalid specifier 2");
112 ASSERT_ERR(load_single_snprintf("%"), "invalid specifier 3");
113 ASSERT_ERR(load_single_snprintf("%12345678"), "invalid specifier 4");
114 ASSERT_ERR(load_single_snprintf("%--------"), "invalid specifier 5");
115 ASSERT_ERR(load_single_snprintf("%lc"), "invalid specifier 6");
116 ASSERT_ERR(load_single_snprintf("%llc"), "invalid specifier 7");
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
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