1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 #include "test_probe_read_user_str.skel.h" 4 5 static const char str1[] = "mestring"; 6 static const char str2[] = "mestringalittlebigger"; 7 static const char str3[] = "mestringblubblubblubblubblub"; 8 9 static int test_one_str(struct test_probe_read_user_str *skel, const char *str, 10 size_t len) 11 { 12 int err, duration = 0; 13 char buf[256]; 14 15 /* Ensure bytes after string are ones */ 16 memset(buf, 1, sizeof(buf)); 17 memcpy(buf, str, len); 18 19 /* Give prog our userspace pointer */ 20 skel->bss->user_ptr = buf; 21 22 /* Trigger tracepoint */ 23 usleep(1); 24 25 /* Did helper fail? */ 26 if (CHECK(skel->bss->ret < 0, "prog_ret", "prog returned: %ld\n", 27 skel->bss->ret)) 28 return 1; 29 30 /* Check that string was copied correctly */ 31 err = memcmp(skel->bss->buf, str, len); 32 if (CHECK(err, "memcmp", "prog copied wrong string")) 33 return 1; 34 35 /* Now check that no extra trailing bytes were copied */ 36 memset(buf, 0, sizeof(buf)); 37 err = memcmp(skel->bss->buf + len, buf, sizeof(buf) - len); 38 if (CHECK(err, "memcmp", "trailing bytes were not stripped")) 39 return 1; 40 41 return 0; 42 } 43 44 void test_probe_read_user_str(void) 45 { 46 struct test_probe_read_user_str *skel; 47 int err, duration = 0; 48 49 skel = test_probe_read_user_str__open_and_load(); 50 if (CHECK(!skel, "test_probe_read_user_str__open_and_load", 51 "skeleton open and load failed\n")) 52 return; 53 54 /* Give pid to bpf prog so it doesn't read from anyone else */ 55 skel->bss->pid = getpid(); 56 57 err = test_probe_read_user_str__attach(skel); 58 if (CHECK(err, "test_probe_read_user_str__attach", 59 "skeleton attach failed: %d\n", err)) 60 goto out; 61 62 if (test_one_str(skel, str1, sizeof(str1))) 63 goto out; 64 if (test_one_str(skel, str2, sizeof(str2))) 65 goto out; 66 if (test_one_str(skel, str3, sizeof(str3))) 67 goto out; 68 69 out: 70 test_probe_read_user_str__destroy(skel); 71 } 72