1 // SPDX-License-Identifier: GPL-2.0 2 #define _GNU_SOURCE 3 #define __SANE_USERSPACE_TYPES__ // Use ll64 4 5 #include <fcntl.h> 6 #include <sched.h> 7 #include <stdio.h> 8 #include <string.h> 9 #include <sys/stat.h> 10 #include <sys/mount.h> 11 #include <unistd.h> 12 13 #include "../../kselftest_harness.h" 14 #include "log.h" 15 #include "wrappers.h" 16 17 FIXTURE(set_layers_via_fds) { 18 }; 19 20 FIXTURE_SETUP(set_layers_via_fds) 21 { 22 ASSERT_EQ(mkdir("/set_layers_via_fds", 0755), 0); 23 } 24 25 FIXTURE_TEARDOWN(set_layers_via_fds) 26 { 27 umount2("/set_layers_via_fds", 0); 28 ASSERT_EQ(rmdir("/set_layers_via_fds"), 0); 29 } 30 31 TEST_F(set_layers_via_fds, set_layers_via_fds) 32 { 33 int fd_context, fd_tmpfs, fd_overlay; 34 int layer_fds[] = { [0 ... 8] = -EBADF }; 35 bool layers_found[] = { [0 ... 8] = false }; 36 size_t len = 0; 37 char *line = NULL; 38 FILE *f_mountinfo; 39 40 ASSERT_EQ(unshare(CLONE_NEWNS), 0); 41 ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); 42 43 fd_context = sys_fsopen("tmpfs", 0); 44 ASSERT_GE(fd_context, 0); 45 46 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 47 fd_tmpfs = sys_fsmount(fd_context, 0, 0); 48 ASSERT_GE(fd_tmpfs, 0); 49 ASSERT_EQ(close(fd_context), 0); 50 51 ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); 52 ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); 53 ASSERT_EQ(mkdirat(fd_tmpfs, "l1", 0755), 0); 54 ASSERT_EQ(mkdirat(fd_tmpfs, "l2", 0755), 0); 55 ASSERT_EQ(mkdirat(fd_tmpfs, "l3", 0755), 0); 56 ASSERT_EQ(mkdirat(fd_tmpfs, "l4", 0755), 0); 57 ASSERT_EQ(mkdirat(fd_tmpfs, "d1", 0755), 0); 58 ASSERT_EQ(mkdirat(fd_tmpfs, "d2", 0755), 0); 59 ASSERT_EQ(mkdirat(fd_tmpfs, "d3", 0755), 0); 60 61 layer_fds[0] = openat(fd_tmpfs, "w", O_DIRECTORY); 62 ASSERT_GE(layer_fds[0], 0); 63 64 layer_fds[1] = openat(fd_tmpfs, "u", O_DIRECTORY); 65 ASSERT_GE(layer_fds[1], 0); 66 67 layer_fds[2] = openat(fd_tmpfs, "l1", O_DIRECTORY); 68 ASSERT_GE(layer_fds[2], 0); 69 70 layer_fds[3] = openat(fd_tmpfs, "l2", O_DIRECTORY); 71 ASSERT_GE(layer_fds[3], 0); 72 73 layer_fds[4] = openat(fd_tmpfs, "l3", O_DIRECTORY); 74 ASSERT_GE(layer_fds[4], 0); 75 76 layer_fds[5] = openat(fd_tmpfs, "l4", O_DIRECTORY); 77 ASSERT_GE(layer_fds[5], 0); 78 79 layer_fds[6] = openat(fd_tmpfs, "d1", O_DIRECTORY); 80 ASSERT_GE(layer_fds[6], 0); 81 82 layer_fds[7] = openat(fd_tmpfs, "d2", O_DIRECTORY); 83 ASSERT_GE(layer_fds[7], 0); 84 85 layer_fds[8] = openat(fd_tmpfs, "d3", O_DIRECTORY); 86 ASSERT_GE(layer_fds[8], 0); 87 88 ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); 89 ASSERT_EQ(close(fd_tmpfs), 0); 90 91 fd_context = sys_fsopen("overlay", 0); 92 ASSERT_GE(fd_context, 0); 93 94 ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir", NULL, layer_fds[2]), 0); 95 96 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, layer_fds[0]), 0); 97 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, layer_fds[1]), 0); 98 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[2]), 0); 99 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[3]), 0); 100 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[4]), 0); 101 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[5]), 0); 102 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[6]), 0); 103 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[7]), 0); 104 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[8]), 0); 105 106 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_STRING, "metacopy", "on", 0), 0); 107 108 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 109 110 fd_overlay = sys_fsmount(fd_context, 0, 0); 111 ASSERT_GE(fd_overlay, 0); 112 113 ASSERT_EQ(sys_move_mount(fd_overlay, "", -EBADF, "/set_layers_via_fds", MOVE_MOUNT_F_EMPTY_PATH), 0); 114 115 f_mountinfo = fopen("/proc/self/mountinfo", "r"); 116 ASSERT_NE(f_mountinfo, NULL); 117 118 while (getline(&line, &len, f_mountinfo) != -1) { 119 char *haystack = line; 120 121 if (strstr(haystack, "workdir=/tmp/w")) 122 layers_found[0] = true; 123 if (strstr(haystack, "upperdir=/tmp/u")) 124 layers_found[1] = true; 125 if (strstr(haystack, "lowerdir+=/tmp/l1")) 126 layers_found[2] = true; 127 if (strstr(haystack, "lowerdir+=/tmp/l2")) 128 layers_found[3] = true; 129 if (strstr(haystack, "lowerdir+=/tmp/l3")) 130 layers_found[4] = true; 131 if (strstr(haystack, "lowerdir+=/tmp/l4")) 132 layers_found[5] = true; 133 if (strstr(haystack, "datadir+=/tmp/d1")) 134 layers_found[6] = true; 135 if (strstr(haystack, "datadir+=/tmp/d2")) 136 layers_found[7] = true; 137 if (strstr(haystack, "datadir+=/tmp/d3")) 138 layers_found[8] = true; 139 } 140 free(line); 141 142 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 143 ASSERT_EQ(layers_found[i], true); 144 ASSERT_EQ(close(layer_fds[i]), 0); 145 } 146 147 ASSERT_EQ(close(fd_context), 0); 148 ASSERT_EQ(close(fd_overlay), 0); 149 ASSERT_EQ(fclose(f_mountinfo), 0); 150 } 151 152 TEST_F(set_layers_via_fds, set_500_layers_via_fds) 153 { 154 int fd_context, fd_tmpfs, fd_overlay, fd_work, fd_upper, fd_lower; 155 int layer_fds[500] = { [0 ... 499] = -EBADF }; 156 157 ASSERT_EQ(unshare(CLONE_NEWNS), 0); 158 ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); 159 160 fd_context = sys_fsopen("tmpfs", 0); 161 ASSERT_GE(fd_context, 0); 162 163 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 164 fd_tmpfs = sys_fsmount(fd_context, 0, 0); 165 ASSERT_GE(fd_tmpfs, 0); 166 ASSERT_EQ(close(fd_context), 0); 167 168 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 169 char path[100]; 170 171 sprintf(path, "l%d", i); 172 ASSERT_EQ(mkdirat(fd_tmpfs, path, 0755), 0); 173 layer_fds[i] = openat(fd_tmpfs, path, O_DIRECTORY); 174 ASSERT_GE(layer_fds[i], 0); 175 } 176 177 ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); 178 fd_work = openat(fd_tmpfs, "w", O_DIRECTORY); 179 ASSERT_GE(fd_work, 0); 180 181 ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); 182 fd_upper = openat(fd_tmpfs, "u", O_DIRECTORY); 183 ASSERT_GE(fd_upper, 0); 184 185 ASSERT_EQ(mkdirat(fd_tmpfs, "l501", 0755), 0); 186 fd_lower = openat(fd_tmpfs, "l501", O_DIRECTORY); 187 ASSERT_GE(fd_lower, 0); 188 189 ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); 190 ASSERT_EQ(close(fd_tmpfs), 0); 191 192 fd_context = sys_fsopen("overlay", 0); 193 ASSERT_GE(fd_context, 0); 194 195 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, fd_work), 0); 196 ASSERT_EQ(close(fd_work), 0); 197 198 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, fd_upper), 0); 199 ASSERT_EQ(close(fd_upper), 0); 200 201 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 202 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[i]), 0); 203 ASSERT_EQ(close(layer_fds[i]), 0); 204 } 205 206 ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower), 0); 207 ASSERT_EQ(close(fd_lower), 0); 208 209 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 210 211 fd_overlay = sys_fsmount(fd_context, 0, 0); 212 ASSERT_GE(fd_overlay, 0); 213 ASSERT_EQ(close(fd_context), 0); 214 ASSERT_EQ(close(fd_overlay), 0); 215 } 216 217 TEST_HARNESS_MAIN 218