/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include "alloc-util.h" #include "dissect-image.h" #include "fd-util.h" #include "fileio.h" #include "fs-util.h" #include "gpt.h" #include "main-func.h" #include "missing_loop.h" #include "mkfs-util.h" #include "mount-util.h" #include "namespace-util.h" #include "parse-util.h" #include "string-util.h" #include "strv.h" #include "tests.h" #include "tmpfile-util.h" #include "user-util.h" #include "virt.h" static unsigned arg_n_threads = 5; static unsigned arg_n_iterations = 3; static usec_t arg_timeout = 0; #if HAVE_BLKID static usec_t end = 0; static void* thread_func(void *ptr) { int fd = PTR_TO_FD(ptr); int r; for (unsigned i = 0; i < arg_n_iterations; i++) { _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL; _cleanup_(umount_and_rmdir_and_freep) char *mounted = NULL; _cleanup_(dissected_image_unrefp) DissectedImage *dissected = NULL; if (now(CLOCK_MONOTONIC) >= end) { log_notice("Time's up, exiting thread's loop"); break; } log_notice("> Thread iteration #%u.", i); assert_se(mkdtemp_malloc(NULL, &mounted) >= 0); r = loop_device_make(fd, O_RDONLY, 0, UINT64_MAX, LO_FLAGS_PARTSCAN, &loop); if (r < 0) log_error_errno(r, "Failed to allocate loopback device: %m"); assert_se(r >= 0); log_notice("Acquired loop device %s, will mount on %s", loop->node, mounted); /* Let's make sure udev doesn't call BLKRRPART in the background, while we try to mount the device. */ assert_se(loop_device_flock(loop, LOCK_SH) >= 0); r = dissect_image(loop->fd, NULL, NULL, loop->diskseq, loop->uevent_seqnum_not_before, loop->timestamp_not_before, DISSECT_IMAGE_READ_ONLY, &dissected); if (r < 0) log_error_errno(r, "Failed dissect loopback device %s: %m", loop->node); assert_se(r >= 0); log_info("Dissected loop device %s", loop->node); for (PartitionDesignator d = 0; d < _PARTITION_DESIGNATOR_MAX; d++) { if (!dissected->partitions[d].found) continue; log_notice("Found node %s fstype %s designator %s", dissected->partitions[d].node, dissected->partitions[d].fstype, partition_designator_to_string(d)); } assert_se(dissected->partitions[PARTITION_ESP].found); assert_se(dissected->partitions[PARTITION_ESP].node); assert_se(dissected->partitions[PARTITION_XBOOTLDR].found); assert_se(dissected->partitions[PARTITION_XBOOTLDR].node); assert_se(dissected->partitions[PARTITION_ROOT].found); assert_se(dissected->partitions[PARTITION_ROOT].node); assert_se(dissected->partitions[PARTITION_HOME].found); assert_se(dissected->partitions[PARTITION_HOME].node); r = dissected_image_mount(dissected, mounted, UID_INVALID, UID_INVALID, DISSECT_IMAGE_READ_ONLY); log_notice_errno(r, "Mounted %s → %s: %m", loop->node, mounted); assert_se(r >= 0); /* Now the block device is mounted, we don't need no manual lock anymore, the devices are now * pinned by the mounts. */ assert_se(loop_device_flock(loop, LOCK_UN) >= 0); log_notice("Unmounting %s", mounted); mounted = umount_and_rmdir_and_free(mounted); log_notice("Unmounted."); dissected = dissected_image_unref(dissected); log_notice("Detaching loop device %s", loop->node); loop = loop_device_unref(loop); log_notice("Detached loop device."); } log_notice("Leaving thread"); return NULL; } #endif static bool have_root_gpt_type(void) { #ifdef GPT_ROOT_NATIVE return true; #else return false; #endif } static int run(int argc, char *argv[]) { _cleanup_free_ char *p = NULL, *cmd = NULL; _cleanup_(pclosep) FILE *sfdisk = NULL; _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL; _cleanup_close_ int fd = -1; int r; test_setup_logging(LOG_DEBUG); log_show_tid(true); log_show_time(true); log_show_color(true); if (argc >= 2) { r = safe_atou(argv[1], &arg_n_threads); if (r < 0) return log_error_errno(r, "Failed to parse first argument (number of threads): %s", argv[1]); if (arg_n_threads <= 0) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Number of threads must be at least 1, refusing."); } if (argc >= 3) { r = safe_atou(argv[2], &arg_n_iterations); if (r < 0) return log_error_errno(r, "Failed to parse second argument (number of iterations): %s", argv[2]); if (arg_n_iterations <= 0) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Number of iterations must be at least 1, refusing."); } if (argc >= 4) { r = parse_sec(argv[3], &arg_timeout); if (r < 0) return log_error_errno(r, "Failed to parse third argument (timeout): %s", argv[3]); } if (argc >= 5) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Too many arguments (expected 3 at max)."); if (!have_root_gpt_type()) { log_tests_skipped("No root partition GPT defined for this architecture, exiting."); return EXIT_TEST_SKIP; } if (detect_container() > 0) { log_tests_skipped("Test not supported in a container, requires udev/uevent notifications."); return EXIT_TEST_SKIP; } /* This is a test for the loopback block device setup code and it's use by the image dissection * logic: since the kernel APIs are hard use and prone to races, let's test this in a heavy duty * test: we open a bunch of threads and repeatedly allocate and deallocate loopback block devices in * them in parallel, with an image file with a number of partitions. */ r = detach_mount_namespace(); if (ERRNO_IS_PRIVILEGE(r)) { log_tests_skipped("Lacking privileges"); return EXIT_TEST_SKIP; } FOREACH_STRING(fs, "vfat", "ext4") { r = mkfs_exists(fs); assert_se(r >= 0); if (!r) { log_tests_skipped("mkfs.{vfat|ext4} not installed"); return EXIT_TEST_SKIP; } } assert_se(r >= 0); assert_se(tempfn_random_child("/var/tmp", "sfdisk", &p) >= 0); fd = open(p, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOFOLLOW, 0666); assert_se(fd >= 0); assert_se(ftruncate(fd, 256*1024*1024) >= 0); assert_se(cmd = strjoin("sfdisk ", p)); assert_se(sfdisk = popen(cmd, "we")); /* A reasonably complex partition table that fits on a 64K disk */ fputs("label: gpt\n" "size=32M, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B\n" "size=32M, type=BC13C2FF-59E6-4262-A352-B275FD6F7172\n" "size=32M, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F\n" "size=32M, type=", sfdisk); #ifdef GPT_ROOT_NATIVE fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(GPT_ROOT_NATIVE)); #else fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(GPT_ROOT_X86_64)); #endif fputs("\n" "size=32M, type=933AC7E1-2EB4-4F13-B844-0E14E2AEF915\n", sfdisk); assert_se(pclose(sfdisk) == 0); sfdisk = NULL; assert_se(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, LO_FLAGS_PARTSCAN, &loop) >= 0); #if HAVE_BLKID _cleanup_(dissected_image_unrefp) DissectedImage *dissected = NULL; _cleanup_(umount_and_rmdir_and_freep) char *mounted = NULL; pthread_t threads[arg_n_threads]; sd_id128_t id; /* Take an explicit lock while we format the file systems, in accordance with * https://systemd.io/BLOCK_DEVICE_LOCKING/. We don't want udev to interfere and probe while we write * or even issue BLKRRPART or similar while we are working on this. */ assert_se(loop_device_flock(loop, LOCK_EX) >= 0); assert_se(dissect_image(loop->fd, NULL, NULL, loop->diskseq, loop->uevent_seqnum_not_before, loop->timestamp_not_before, 0, &dissected) >= 0); assert_se(dissected->partitions[PARTITION_ESP].found); assert_se(dissected->partitions[PARTITION_ESP].node); assert_se(dissected->partitions[PARTITION_XBOOTLDR].found); assert_se(dissected->partitions[PARTITION_XBOOTLDR].node); assert_se(dissected->partitions[PARTITION_ROOT].found); assert_se(dissected->partitions[PARTITION_ROOT].node); assert_se(dissected->partitions[PARTITION_HOME].found); assert_se(dissected->partitions[PARTITION_HOME].node); assert_se(sd_id128_randomize(&id) >= 0); assert_se(make_filesystem(dissected->partitions[PARTITION_ESP].node, "vfat", "EFI", id, true) >= 0); assert_se(sd_id128_randomize(&id) >= 0); assert_se(make_filesystem(dissected->partitions[PARTITION_XBOOTLDR].node, "vfat", "xbootldr", id, true) >= 0); assert_se(sd_id128_randomize(&id) >= 0); assert_se(make_filesystem(dissected->partitions[PARTITION_ROOT].node, "ext4", "root", id, true) >= 0); assert_se(sd_id128_randomize(&id) >= 0); assert_se(make_filesystem(dissected->partitions[PARTITION_HOME].node, "ext4", "home", id, true) >= 0); dissected = dissected_image_unref(dissected); assert_se(dissect_image(loop->fd, NULL, NULL, loop->diskseq, loop->uevent_seqnum_not_before, loop->timestamp_not_before, 0, &dissected) >= 0); assert_se(mkdtemp_malloc(NULL, &mounted) >= 0); /* We are particularly correct here, and now downgrade LOCK → LOCK_SH. That's because we are done * with formatting the file systems, so we don't need the exclusive lock anymore. From now on a * shared one is fine. This way udev can now probe the device if it wants, but still won't call * BLKRRPART on it, and that's good, because that would destroy our partition table while we are at * it. */ assert_se(loop_device_flock(loop, LOCK_SH) >= 0); /* This first (writable) mount will initialize the mount point dirs, so that the subsequent read-only ones can work */ assert_se(dissected_image_mount(dissected, mounted, UID_INVALID, UID_INVALID, 0) >= 0); /* Now we mounted everything, the partitions are pinned. Now it's fine to release the lock * fully. This means udev could now issue BLKRRPART again, but that's OK given this will fail because * we now mounted the device. */ assert_se(loop_device_flock(loop, LOCK_UN) >= 0); assert_se(umount_recursive(mounted, 0) >= 0); loop = loop_device_unref(loop); log_notice("Threads are being started now"); /* zero timeout means pick default: let's make sure we run for 10s on slow systems at max */ if (arg_timeout == 0) arg_timeout = slow_tests_enabled() ? 5 * USEC_PER_SEC : 1 * USEC_PER_SEC; end = usec_add(now(CLOCK_MONOTONIC), arg_timeout); if (arg_n_threads > 1) for (unsigned i = 0; i < arg_n_threads; i++) assert_se(pthread_create(threads + i, NULL, thread_func, FD_TO_PTR(fd)) == 0); log_notice("All threads started now."); if (arg_n_threads == 1) assert_se(thread_func(FD_TO_PTR(fd)) == NULL); else for (unsigned i = 0; i < arg_n_threads; i++) { log_notice("Joining thread #%u.", i); void *k; assert_se(pthread_join(threads[i], &k) == 0); assert_se(k == NULL); log_notice("Joined thread #%u.", i); } log_notice("Threads are all terminated now."); #else log_notice("Cutting test short, since we do not have libblkid."); #endif return 0; } DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);