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-rw-r--r--src/test/test-loop-block.c338
1 files changed, 338 insertions, 0 deletions
diff --git a/src/test/test-loop-block.c b/src/test/test-loop-block.c
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+++ b/src/test/test-loop-block.c
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+/* 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);