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// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <lib/fdio/directory.h>
#include <lib/zx/vmo.h>
#include <fs-management/format.h>
#include <ramdevice-client/ramdisk.h>
#include <zxtest/zxtest.h>
namespace {
static constexpr uint8_t kGptMagic[] = {0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54,
0x00, 0x00, 0x01, 0x00, 0x5c, 0x00, 0x00, 0x00};
void CreateEmptyRamdisk(zx::vmo vmo, ramdisk_client **client) {
zx::channel local, remote;
ASSERT_OK(zx::channel::create(0, &local, &remote));
ASSERT_OK(
fdio_service_connect("/svc/fuchsia.fsmanagement.devmgr.IsolatedDevmgr", remote.release()));
int fd;
fdio_fd_create(local.release(), &fd);
ASSERT_OK(ramdisk_create_at_from_vmo(fd, vmo.release(), client));
}
TEST(FormatDetectionTest, TestInvalidGptIgnored) {
ramdisk_client *client;
zx::vmo vmo;
ASSERT_OK(zx::vmo::create(2 * ZX_PAGE_SIZE, 0, &vmo));
vmo.write(kGptMagic, 0x200, sizeof(kGptMagic));
ASSERT_NO_FATAL_FAILURES(CreateEmptyRamdisk(std::move(vmo), &client));
int fd = ramdisk_get_block_fd(client);
ASSERT_EQ(detect_disk_format(fd), DISK_FORMAT_UNKNOWN);
ASSERT_EQ(ramdisk_destroy(client), ZX_OK);
}
TEST(FormatDetectionTest, TestGptWithUnusualBlockSize) {
ramdisk_client *client;
zx::vmo vmo;
ASSERT_OK(zx::vmo::create(2 * ZX_PAGE_SIZE, 0, &vmo));
vmo.write(kGptMagic, ZX_PAGE_SIZE, sizeof(kGptMagic));
ASSERT_NO_FATAL_FAILURES(CreateEmptyRamdisk(std::move(vmo), &client));
int fd = ramdisk_get_block_fd(client);
ASSERT_EQ(detect_disk_format(fd), DISK_FORMAT_GPT);
ASSERT_EQ(ramdisk_destroy(client), ZX_OK);
}
TEST(FormatDetectionTest, TestVbmetaRecognised) {
ramdisk_client *client;
zx::vmo vmo;
ASSERT_OK(zx::vmo::create(2 * ZX_PAGE_SIZE, 0, &vmo));
// Write the vbmeta magic string at the start of the device.
const unsigned char kVbmetaMagic[] = {'A','V','B','0'};
vmo.write(kVbmetaMagic, /*offset=*/0x0, sizeof(kVbmetaMagic));
// Add the MBR magic string to the end of the first sector. These bytes in
// vbmeta tend to be randomish, and previously we've had bugs where if these
// bytes happened to match the MBR magic, we would misrecognise the partition.
// (c.f. fxbug.dev/59374)
const unsigned char kMbrMagic[] = {0x55, 0xaa};
vmo.write(kMbrMagic, /*offset=*/510, sizeof(kMbrMagic));
ASSERT_NO_FATAL_FAILURES(CreateEmptyRamdisk(std::move(vmo), &client));
int fd = ramdisk_get_block_fd(client);
ASSERT_EQ(detect_disk_format(fd), DISK_FORMAT_VBMETA);
ASSERT_EQ(ramdisk_destroy(client), ZX_OK);
}
} // namespace