diff options
Diffstat (limited to 'src/test/test-loop-block.c')
| -rw-r--r-- | src/test/test-loop-block.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/src/test/test-loop-block.c b/src/test/test-loop-block.c new file mode 100644 index 0000000..b06ab0d --- /dev/null +++ b/src/test/test-loop-block.c @@ -0,0 +1,338 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <fcntl.h> +#include <linux/loop.h> +#include <pthread.h> +#include <sys/file.h> +#include <sys/ioctl.h> +#include <sys/mount.h> + +#include "alloc-util.h" +#include "capability-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 "path-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 verify_dissected_image(DissectedImage *dissected) { + 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); +} + +static void verify_dissected_image_harder(DissectedImage *dissected) { + verify_dissected_image(dissected); + + assert_se(streq(dissected->partitions[PARTITION_ESP].fstype, "vfat")); + assert_se(streq(dissected->partitions[PARTITION_XBOOTLDR].fstype, "vfat")); + assert_se(streq(dissected->partitions[PARTITION_ROOT].fstype, "ext4")); + assert_se(streq(dissected->partitions[PARTITION_HOME].fstype, "ext4")); +} + +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, 0, LO_FLAGS_PARTSCAN, LOCK_SH, &loop); + if (r < 0) + log_error_errno(r, "Failed to allocate loopback device: %m"); + assert_se(r >= 0); + assert_se(loop->dev); + assert_se(loop->backing_file); + + log_notice("Acquired loop device %s, will mount on %s", loop->node, mounted); + + r = dissect_loop_device(loop, NULL, NULL, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_ADD_PARTITION_DEVICES|DISSECT_IMAGE_PIN_PARTITION_DEVICES, &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)); + } + + verify_dissected_image(dissected); + + 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 SD_GPT_ROOT_NATIVE + return true; +#else + return false; +#endif +} + +static int run(int argc, char *argv[]) { +#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; +#endif + _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()) + return log_tests_skipped("No root partition GPT defined for this architecture"); + + r = find_executable("sfdisk", NULL); + if (r < 0) + return log_tests_skipped_errno(r, "Could not find sfdisk command"); + + 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 SD_GPT_ROOT_NATIVE + fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_GPT_ROOT_NATIVE)); +#else + fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_GPT_ROOT_X86_64)); +#endif + + fputs("\n" + "size=32M, type=933AC7E1-2EB4-4F13-B844-0E14E2AEF915\n", sfdisk); + + assert_se(pclose(sfdisk) == 0); + sfdisk = NULL; + +#if HAVE_BLKID + assert_se(dissect_image_file(p, NULL, NULL, 0, &dissected) >= 0); + verify_dissected_image(dissected); + dissected = dissected_image_unref(dissected); +#endif + + if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0) { + log_tests_skipped("not running privileged"); + return 0; + } + + if (detect_container() > 0) { + log_tests_skipped("Test not supported in a container, requires udev/uevent notifications"); + return 0; + } + + assert_se(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, LO_FLAGS_PARTSCAN, LOCK_EX, &loop) >= 0); + +#if HAVE_BLKID + assert_se(dissect_loop_device(loop, NULL, NULL, DISSECT_IMAGE_ADD_PARTITION_DEVICES|DISSECT_IMAGE_PIN_PARTITION_DEVICES, &dissected) >= 0); + verify_dissected_image(dissected); + + FOREACH_STRING(fs, "vfat", "ext4") { + r = mkfs_exists(fs); + assert_se(r >= 0); + if (!r) { + log_tests_skipped("mkfs.{vfat|ext4} not installed"); + return 0; + } + } + assert_se(r >= 0); + + assert_se(sd_id128_randomize(&id) >= 0); + assert_se(make_filesystem(dissected->partitions[PARTITION_ESP].node, "vfat", "EFI", NULL, id, true) >= 0); + + assert_se(sd_id128_randomize(&id) >= 0); + assert_se(make_filesystem(dissected->partitions[PARTITION_XBOOTLDR].node, "vfat", "xbootldr", NULL, id, true) >= 0); + + assert_se(sd_id128_randomize(&id) >= 0); + assert_se(make_filesystem(dissected->partitions[PARTITION_ROOT].node, "ext4", "root", NULL, id, true) >= 0); + + assert_se(sd_id128_randomize(&id) >= 0); + assert_se(make_filesystem(dissected->partitions[PARTITION_HOME].node, "ext4", "home", NULL, id, true) >= 0); + + dissected = dissected_image_unref(dissected); + + /* We created the file systems now via the per-partition block devices. But the dissection code might + * probe them via the whole block device. These block devices have separate buffer caches though, + * hence what was written via the partition device might not appear on the whole block device + * yet. Let's hence explicitly flush the whole block device, so that the read-back definitely + * works. */ + assert_se(ioctl(loop->fd, BLKFLSBUF, 0) >= 0); + + /* Try to read once, without pinning or adding partitions, i.e. by only accessing the whole block + * device. */ + assert_se(dissect_loop_device(loop, NULL, NULL, 0, &dissected) >= 0); + verify_dissected_image_harder(dissected); + dissected = dissected_image_unref(dissected); + + /* Now go via the loopback device after all, but this time add/pin, because now we want to mount it. */ + assert_se(dissect_loop_device(loop, NULL, NULL, DISSECT_IMAGE_ADD_PARTITION_DEVICES|DISSECT_IMAGE_PIN_PARTITION_DEVICES, &dissected) >= 0); + verify_dissected_image_harder(dissected); + + 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 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. */ + assert_se(detach_mount_namespace() >= 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); + + 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); |