| // SPDX-License-Identifier: GPL-2.0 |
| #define _GNU_SOURCE |
| #define __SANE_USERSPACE_TYPES__ // Use ll64 |
| |
| #include <fcntl.h> |
| #include <sched.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/mount.h> |
| #include <unistd.h> |
| |
| #include "../../kselftest_harness.h" |
| #include "log.h" |
| #include "wrappers.h" |
| |
| FIXTURE(set_layers_via_fds) { |
| }; |
| |
| FIXTURE_SETUP(set_layers_via_fds) |
| { |
| ASSERT_EQ(mkdir("/set_layers_via_fds", 0755), 0); |
| } |
| |
| FIXTURE_TEARDOWN(set_layers_via_fds) |
| { |
| umount2("/set_layers_via_fds", 0); |
| ASSERT_EQ(rmdir("/set_layers_via_fds"), 0); |
| } |
| |
| TEST_F(set_layers_via_fds, set_layers_via_fds) |
| { |
| int fd_context, fd_tmpfs, fd_overlay; |
| int layer_fds[] = { [0 ... 8] = -EBADF }; |
| bool layers_found[] = { [0 ... 8] = false }; |
| size_t len = 0; |
| char *line = NULL; |
| FILE *f_mountinfo; |
| |
| ASSERT_EQ(unshare(CLONE_NEWNS), 0); |
| ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); |
| |
| fd_context = sys_fsopen("tmpfs", 0); |
| ASSERT_GE(fd_context, 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); |
| fd_tmpfs = sys_fsmount(fd_context, 0, 0); |
| ASSERT_GE(fd_tmpfs, 0); |
| ASSERT_EQ(close(fd_context), 0); |
| |
| ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "l1", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "l2", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "l3", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "l4", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "d1", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "d2", 0755), 0); |
| ASSERT_EQ(mkdirat(fd_tmpfs, "d3", 0755), 0); |
| |
| layer_fds[0] = openat(fd_tmpfs, "w", O_DIRECTORY); |
| ASSERT_GE(layer_fds[0], 0); |
| |
| layer_fds[1] = openat(fd_tmpfs, "u", O_DIRECTORY); |
| ASSERT_GE(layer_fds[1], 0); |
| |
| layer_fds[2] = openat(fd_tmpfs, "l1", O_DIRECTORY); |
| ASSERT_GE(layer_fds[2], 0); |
| |
| layer_fds[3] = openat(fd_tmpfs, "l2", O_DIRECTORY); |
| ASSERT_GE(layer_fds[3], 0); |
| |
| layer_fds[4] = openat(fd_tmpfs, "l3", O_DIRECTORY); |
| ASSERT_GE(layer_fds[4], 0); |
| |
| layer_fds[5] = openat(fd_tmpfs, "l4", O_DIRECTORY); |
| ASSERT_GE(layer_fds[5], 0); |
| |
| layer_fds[6] = openat(fd_tmpfs, "d1", O_DIRECTORY); |
| ASSERT_GE(layer_fds[6], 0); |
| |
| layer_fds[7] = openat(fd_tmpfs, "d2", O_DIRECTORY); |
| ASSERT_GE(layer_fds[7], 0); |
| |
| layer_fds[8] = openat(fd_tmpfs, "d3", O_DIRECTORY); |
| ASSERT_GE(layer_fds[8], 0); |
| |
| ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); |
| ASSERT_EQ(close(fd_tmpfs), 0); |
| |
| fd_context = sys_fsopen("overlay", 0); |
| ASSERT_GE(fd_context, 0); |
| |
| ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir", NULL, layer_fds[2]), 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, layer_fds[0]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, layer_fds[1]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[2]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[3]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[4]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[5]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[6]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[7]), 0); |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[8]), 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_STRING, "metacopy", "on", 0), 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); |
| |
| fd_overlay = sys_fsmount(fd_context, 0, 0); |
| ASSERT_GE(fd_overlay, 0); |
| |
| ASSERT_EQ(sys_move_mount(fd_overlay, "", -EBADF, "/set_layers_via_fds", MOVE_MOUNT_F_EMPTY_PATH), 0); |
| |
| f_mountinfo = fopen("/proc/self/mountinfo", "r"); |
| ASSERT_NE(f_mountinfo, NULL); |
| |
| while (getline(&line, &len, f_mountinfo) != -1) { |
| char *haystack = line; |
| |
| if (strstr(haystack, "workdir=/tmp/w")) |
| layers_found[0] = true; |
| if (strstr(haystack, "upperdir=/tmp/u")) |
| layers_found[1] = true; |
| if (strstr(haystack, "lowerdir+=/tmp/l1")) |
| layers_found[2] = true; |
| if (strstr(haystack, "lowerdir+=/tmp/l2")) |
| layers_found[3] = true; |
| if (strstr(haystack, "lowerdir+=/tmp/l3")) |
| layers_found[4] = true; |
| if (strstr(haystack, "lowerdir+=/tmp/l4")) |
| layers_found[5] = true; |
| if (strstr(haystack, "datadir+=/tmp/d1")) |
| layers_found[6] = true; |
| if (strstr(haystack, "datadir+=/tmp/d2")) |
| layers_found[7] = true; |
| if (strstr(haystack, "datadir+=/tmp/d3")) |
| layers_found[8] = true; |
| } |
| free(line); |
| |
| for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { |
| ASSERT_EQ(layers_found[i], true); |
| ASSERT_EQ(close(layer_fds[i]), 0); |
| } |
| |
| ASSERT_EQ(close(fd_context), 0); |
| ASSERT_EQ(close(fd_overlay), 0); |
| ASSERT_EQ(fclose(f_mountinfo), 0); |
| } |
| |
| TEST_F(set_layers_via_fds, set_500_layers_via_fds) |
| { |
| int fd_context, fd_tmpfs, fd_overlay, fd_work, fd_upper, fd_lower; |
| int layer_fds[500] = { [0 ... 499] = -EBADF }; |
| |
| ASSERT_EQ(unshare(CLONE_NEWNS), 0); |
| ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); |
| |
| fd_context = sys_fsopen("tmpfs", 0); |
| ASSERT_GE(fd_context, 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); |
| fd_tmpfs = sys_fsmount(fd_context, 0, 0); |
| ASSERT_GE(fd_tmpfs, 0); |
| ASSERT_EQ(close(fd_context), 0); |
| |
| for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { |
| char path[100]; |
| |
| sprintf(path, "l%d", i); |
| ASSERT_EQ(mkdirat(fd_tmpfs, path, 0755), 0); |
| layer_fds[i] = openat(fd_tmpfs, path, O_DIRECTORY); |
| ASSERT_GE(layer_fds[i], 0); |
| } |
| |
| ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); |
| fd_work = openat(fd_tmpfs, "w", O_DIRECTORY); |
| ASSERT_GE(fd_work, 0); |
| |
| ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); |
| fd_upper = openat(fd_tmpfs, "u", O_DIRECTORY); |
| ASSERT_GE(fd_upper, 0); |
| |
| ASSERT_EQ(mkdirat(fd_tmpfs, "l501", 0755), 0); |
| fd_lower = openat(fd_tmpfs, "l501", O_DIRECTORY); |
| ASSERT_GE(fd_lower, 0); |
| |
| ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); |
| ASSERT_EQ(close(fd_tmpfs), 0); |
| |
| fd_context = sys_fsopen("overlay", 0); |
| ASSERT_GE(fd_context, 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, fd_work), 0); |
| ASSERT_EQ(close(fd_work), 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, fd_upper), 0); |
| ASSERT_EQ(close(fd_upper), 0); |
| |
| for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[i]), 0); |
| ASSERT_EQ(close(layer_fds[i]), 0); |
| } |
| |
| ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower), 0); |
| ASSERT_EQ(close(fd_lower), 0); |
| |
| ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); |
| |
| fd_overlay = sys_fsmount(fd_context, 0, 0); |
| ASSERT_GE(fd_overlay, 0); |
| ASSERT_EQ(close(fd_context), 0); |
| ASSERT_EQ(close(fd_overlay), 0); |
| } |
| |
| TEST_HARNESS_MAIN |
