1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 #define _GNU_SOURCE 4 #include <stdio.h> 5 #include <sched.h> 6 #include <sys/mount.h> 7 #include <sys/stat.h> 8 #include <sys/types.h> 9 #include <test_progs.h> 10 11 #define TDIR "/sys/kernel/debug" 12 13 static int read_iter(char *file) 14 { 15 /* 1024 should be enough to get contiguous 4 "iter" letters at some point */ 16 char buf[1024]; 17 int fd, len; 18 19 fd = open(file, 0); 20 if (fd < 0) 21 return -1; 22 while ((len = read(fd, buf, sizeof(buf))) > 0) 23 if (strstr(buf, "iter")) { 24 close(fd); 25 return 0; 26 } 27 close(fd); 28 return -1; 29 } 30 31 static int fn(void) 32 { 33 struct stat a, b, c; 34 int err, map; 35 36 err = unshare(CLONE_NEWNS); 37 if (!ASSERT_OK(err, "unshare")) 38 goto out; 39 40 err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL); 41 if (!ASSERT_OK(err, "mount /")) 42 goto out; 43 44 err = umount(TDIR); 45 if (!ASSERT_OK(err, "umount " TDIR)) 46 goto out; 47 48 err = mount("none", TDIR, "tmpfs", 0, NULL); 49 if (!ASSERT_OK(err, "mount tmpfs")) 50 goto out; 51 52 err = mkdir(TDIR "/fs1", 0777); 53 if (!ASSERT_OK(err, "mkdir " TDIR "/fs1")) 54 goto out; 55 err = mkdir(TDIR "/fs2", 0777); 56 if (!ASSERT_OK(err, "mkdir " TDIR "/fs2")) 57 goto out; 58 59 err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL); 60 if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs1")) 61 goto out; 62 err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL); 63 if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs2")) 64 goto out; 65 66 err = read_iter(TDIR "/fs1/maps.debug"); 67 if (!ASSERT_OK(err, "reading " TDIR "/fs1/maps.debug")) 68 goto out; 69 err = read_iter(TDIR "/fs2/progs.debug"); 70 if (!ASSERT_OK(err, "reading " TDIR "/fs2/progs.debug")) 71 goto out; 72 73 err = mkdir(TDIR "/fs1/a", 0777); 74 if (!ASSERT_OK(err, "creating " TDIR "/fs1/a")) 75 goto out; 76 err = mkdir(TDIR "/fs1/a/1", 0777); 77 if (!ASSERT_OK(err, "creating " TDIR "/fs1/a/1")) 78 goto out; 79 err = mkdir(TDIR "/fs1/b", 0777); 80 if (!ASSERT_OK(err, "creating " TDIR "/fs1/b")) 81 goto out; 82 83 map = bpf_create_map(BPF_MAP_TYPE_ARRAY, 4, 4, 1, 0); 84 if (!ASSERT_GT(map, 0, "create_map(ARRAY)")) 85 goto out; 86 err = bpf_obj_pin(map, TDIR "/fs1/c"); 87 if (!ASSERT_OK(err, "pin map")) 88 goto out; 89 close(map); 90 91 /* Check that RENAME_EXCHANGE works for directories. */ 92 err = stat(TDIR "/fs1/a", &a); 93 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/a)")) 94 goto out; 95 err = renameat2(0, TDIR "/fs1/a", 0, TDIR "/fs1/b", RENAME_EXCHANGE); 96 if (!ASSERT_OK(err, "renameat2(/fs1/a, /fs1/b, RENAME_EXCHANGE)")) 97 goto out; 98 err = stat(TDIR "/fs1/b", &b); 99 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/b)")) 100 goto out; 101 if (!ASSERT_EQ(a.st_ino, b.st_ino, "b should have a's inode")) 102 goto out; 103 err = access(TDIR "/fs1/b/1", F_OK); 104 if (!ASSERT_OK(err, "access(" TDIR "/fs1/b/1)")) 105 goto out; 106 107 /* Check that RENAME_EXCHANGE works for mixed file types. */ 108 err = stat(TDIR "/fs1/c", &c); 109 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/map)")) 110 goto out; 111 err = renameat2(0, TDIR "/fs1/c", 0, TDIR "/fs1/b", RENAME_EXCHANGE); 112 if (!ASSERT_OK(err, "renameat2(/fs1/c, /fs1/b, RENAME_EXCHANGE)")) 113 goto out; 114 err = stat(TDIR "/fs1/b", &b); 115 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/b)")) 116 goto out; 117 if (!ASSERT_EQ(c.st_ino, b.st_ino, "b should have c's inode")) 118 goto out; 119 err = access(TDIR "/fs1/c/1", F_OK); 120 if (!ASSERT_OK(err, "access(" TDIR "/fs1/c/1)")) 121 goto out; 122 123 /* Check that RENAME_NOREPLACE works. */ 124 err = renameat2(0, TDIR "/fs1/b", 0, TDIR "/fs1/a", RENAME_NOREPLACE); 125 if (!ASSERT_ERR(err, "renameat2(RENAME_NOREPLACE)")) { 126 err = -EINVAL; 127 goto out; 128 } 129 err = access(TDIR "/fs1/b", F_OK); 130 if (!ASSERT_OK(err, "access(" TDIR "/fs1/b)")) 131 goto out; 132 133 out: 134 umount(TDIR "/fs1"); 135 umount(TDIR "/fs2"); 136 rmdir(TDIR "/fs1"); 137 rmdir(TDIR "/fs2"); 138 umount(TDIR); 139 exit(err); 140 } 141 142 void test_test_bpffs(void) 143 { 144 int err, duration = 0, status = 0; 145 pid_t pid; 146 147 pid = fork(); 148 if (CHECK(pid == -1, "clone", "clone failed %d", errno)) 149 return; 150 if (pid == 0) 151 fn(); 152 err = waitpid(pid, &status, 0); 153 if (CHECK(err == -1 && errno != ECHILD, "waitpid", "failed %d", errno)) 154 return; 155 if (CHECK(WEXITSTATUS(status), "bpffs test ", "failed %d", WEXITSTATUS(status))) 156 return; 157 } 158