MarcoBuster/Magisk
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Magisk/native/jni/magiskboot/bootimg.cpp
topjohnwu aec06a6f61 Get proper total image size
2021-01-14 03:55:27 -08:00

655 lines
21 KiB
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#include <sys/mman.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <libfdt.h>
#include <functional>
#include <memory>
#include <mincrypt/sha.h>
#include <mincrypt/sha256.h>
#include <utils.hpp>
#include "bootimg.hpp"
#include "magiskboot.hpp"
#include "compress.hpp"
using namespace std;
uint32_t dyn_img_hdr::j32 = 0;
uint64_t dyn_img_hdr::j64 = 0;
#define PADDING 15
static void decompress(format_t type, int fd, const void *in, size_t size) {
auto ptr = get_decoder(type, make_unique<fd_stream>(fd));
ptr->write(in, size);
}
static off_t compress(format_t type, int fd, const void *in, size_t size) {
auto prev = lseek(fd, 0, SEEK_CUR);
{
auto strm = get_encoder(type, make_unique<fd_stream>(fd));
strm->write(in, size);
}
auto now = lseek(fd, 0, SEEK_CUR);
return now - prev;
}
static void dump(void *buf, size_t size, const char *filename) {
if (size == 0)
return;
int fd = creat(filename, 0644);
xwrite(fd, buf, size);
close(fd);
}
static size_t restore(int fd, const char *filename) {
int ifd = xopen(filename, O_RDONLY);
size_t size = lseek(ifd, 0, SEEK_END);
lseek(ifd, 0, SEEK_SET);
xsendfile(fd, ifd, nullptr, size);
close(ifd);
return size;
}
static void restore_buf(int fd, const void *buf, size_t size) {
xwrite(fd, buf, size);
}
void dyn_img_hdr::print() {
uint32_t ver = header_version();
fprintf(stderr, "%-*s [%u]\n", PADDING, "HEADER_VER", ver);
fprintf(stderr, "%-*s [%u]\n", PADDING, "KERNEL_SZ", kernel_size());
fprintf(stderr, "%-*s [%u]\n", PADDING, "RAMDISK_SZ", ramdisk_size());
if (ver < 3)
fprintf(stderr, "%-*s [%u]\n", PADDING, "SECOND_SZ", second_size());
if (ver == 0)
fprintf(stderr, "%-*s [%u]\n", PADDING, "EXTRA_SZ", extra_size());
if (ver == 1 || ver == 2)
fprintf(stderr, "%-*s [%u]\n", PADDING, "RECOV_DTBO_SZ", recovery_dtbo_size());
if (ver == 2)
fprintf(stderr, "%-*s [%u]\n", PADDING, "DTB_SZ", dtb_size());
if (uint32_t os_ver = os_version()) {
int a,b,c,y,m = 0;
int version = os_ver >> 11;
int patch_level = os_ver & 0x7ff;
a = (version >> 14) & 0x7f;
b = (version >> 7) & 0x7f;
c = version & 0x7f;
fprintf(stderr, "%-*s [%d.%d.%d]\n", PADDING, "OS_VERSION", a, b, c);
y = (patch_level >> 4) + 2000;
m = patch_level & 0xf;
fprintf(stderr, "%-*s [%d-%02d]\n", PADDING, "OS_PATCH_LEVEL", y, m);
}
fprintf(stderr, "%-*s [%u]\n", PADDING, "PAGESIZE", page_size());
if (ver < 3) {
fprintf(stderr, "%-*s [%s]\n", PADDING, "NAME", name());
}
fprintf(stderr, "%-*s [%.*s%.*s]\n", PADDING, "CMDLINE",
BOOT_ARGS_SIZE, cmdline(), BOOT_EXTRA_ARGS_SIZE, extra_cmdline());
if (auto chksum = reinterpret_cast<uint8_t*>(id())) {
fprintf(stderr, "%-*s [", PADDING, "CHECKSUM");
for (int i = 0; i < SHA256_DIGEST_SIZE; ++i)
fprintf(stderr, "%02hhx", chksum[i]);
fprintf(stderr, "]\n");
}
}
void dyn_img_hdr::dump_hdr_file() {
FILE *fp = xfopen(HEADER_FILE, "w");
fprintf(fp, "pagesize=%u\n", page_size());
if (name())
fprintf(fp, "name=%s\n", name());
fprintf(fp, "cmdline=%.*s%.*s\n", BOOT_ARGS_SIZE, cmdline(), BOOT_EXTRA_ARGS_SIZE, extra_cmdline());
uint32_t ver = os_version();
if (ver) {
int a, b, c, y, m;
int version, patch_level;
version = ver >> 11;
patch_level = ver & 0x7ff;
a = (version >> 14) & 0x7f;
b = (version >> 7) & 0x7f;
c = version & 0x7f;
fprintf(fp, "os_version=%d.%d.%d\n", a, b, c);
y = (patch_level >> 4) + 2000;
m = patch_level & 0xf;
fprintf(fp, "os_patch_level=%d-%02d\n", y, m);
}
fclose(fp);
}
void dyn_img_hdr::load_hdr_file() {
parse_prop_file(HEADER_FILE, [=](string_view key, string_view value) -> bool {
if (key == "page_size") {
page_size() = parse_int(value);
} else if (key == "name" && name()) {
memset(name(), 0, 16);
memcpy(name(), value.data(), value.length() > 15 ? 15 : value.length());
} else if (key == "cmdline") {
memset(cmdline(), 0, BOOT_ARGS_SIZE);
memset(extra_cmdline(), 0, BOOT_EXTRA_ARGS_SIZE);
if (value.length() > BOOT_ARGS_SIZE) {
memcpy(cmdline(), value.data(), BOOT_ARGS_SIZE);
auto len = std::min(value.length() - BOOT_ARGS_SIZE, (size_t) BOOT_EXTRA_ARGS_SIZE);
memcpy(extra_cmdline(), &value[BOOT_ARGS_SIZE], len);
} else {
memcpy(cmdline(), value.data(), value.length());
}
} else if (key == "os_version") {
int patch_level = os_version() & 0x7ff;
int a, b, c;
sscanf(value.data(), "%d.%d.%d", &a, &b, &c);
os_version() = (((a << 14) | (b << 7) | c) << 11) | patch_level;
} else if (key == "os_patch_level") {
int os_ver = os_version() >> 11;
int y, m;
sscanf(value.data(), "%d-%d", &y, &m);
y -= 2000;
os_version() = (os_ver << 11) | (y << 4) | m;
}
return true;
});
}
boot_img::boot_img(const char *image) {
mmap_ro(image, map_addr, map_size);
fprintf(stderr, "Parsing boot image: [%s]\n", image);
for (uint8_t *addr = map_addr; addr < map_addr + map_size; ++addr) {
format_t fmt = check_fmt(addr, map_size);
switch (fmt) {
case CHROMEOS:
// chromeos require external signing
flags |= CHROMEOS_FLAG;
addr += 65535;
break;
case DHTB:
flags |= (DHTB_FLAG | SEANDROID_FLAG);
fprintf(stderr, "DHTB_HDR\n");
addr += sizeof(dhtb_hdr) - 1;
break;
case BLOB:
flags |= BLOB_FLAG;
fprintf(stderr, "TEGRA_BLOB\n");
addr += sizeof(blob_hdr) - 1;
break;
case AOSP:
case AOSP_VENDOR:
parse_image(addr, fmt);
return;
default:
break;
}
}
exit(1);
}
boot_img::~boot_img() {
munmap(map_addr, map_size);
delete hdr;
}
static int find_dtb_offset(uint8_t *buf, unsigned sz) {
for (int off = 0; off + sizeof(fdt_header) < sz; ++off) {
auto fdt_hdr = reinterpret_cast<fdt_header *>(buf + off);
if (fdt32_to_cpu(fdt_hdr->magic) != FDT_MAGIC)
continue;
// Check that fdt_header.totalsize does not overflow kernel image size
uint32_t totalsize = fdt32_to_cpu(fdt_hdr->totalsize);
if (totalsize + off > sz)
continue;
// Check that fdt_header.off_dt_struct does not overflow kernel image size
uint32_t off_dt_struct = fdt32_to_cpu(fdt_hdr->off_dt_struct);
if (off_dt_struct + off > sz)
continue;
// Check that fdt_node_header.tag of first node is FDT_BEGIN_NODE
auto fdt_node_hdr = reinterpret_cast<fdt_node_header *>(buf + off + off_dt_struct);
if (fdt32_to_cpu(fdt_node_hdr->tag) != FDT_BEGIN_NODE)
continue;
return off;
}
return -1;
}
static format_t check_fmt_lg(uint8_t *buf, unsigned sz) {
format_t fmt = check_fmt(buf, sz);
if (fmt == LZ4_LEGACY) {
// We need to check if it is LZ4_LG
unsigned off = 4;
unsigned block_sz;
while (off + sizeof(block_sz) <= sz) {
memcpy(&block_sz, buf + off, sizeof(block_sz));
off += sizeof(block_sz);
if (off + block_sz > sz)
return LZ4_LG;
off += block_sz;
}
}
return fmt;
}
#define get_block(name) {\
name = addr + off; \
off += hdr->name##_size(); \
off = do_align(off, hdr->page_size()); \
}
void boot_img::parse_image(uint8_t *addr, format_t type) {
auto hp = reinterpret_cast<boot_img_hdr*>(addr);
if (type == AOSP_VENDOR) {
fprintf(stderr, "VENDOR_BOOT_HDR\n");
hdr = new dyn_img_vnd_v3(addr);
} else if (hp->page_size >= 0x02000000) {
fprintf(stderr, "PXA_BOOT_HDR\n");
hdr = new dyn_img_pxa(addr);
} else {
if (memcmp(hp->cmdline, NOOKHD_RL_MAGIC, 10) == 0 ||
memcmp(hp->cmdline, NOOKHD_GL_MAGIC, 12) == 0 ||
memcmp(hp->cmdline, NOOKHD_GR_MAGIC, 14) == 0 ||
memcmp(hp->cmdline, NOOKHD_EB_MAGIC, 26) == 0 ||
memcmp(hp->cmdline, NOOKHD_ER_MAGIC, 30) == 0) {
flags |= NOOKHD_FLAG;
fprintf(stderr, "NOOKHD_LOADER\n");
addr += NOOKHD_PRE_HEADER_SZ;
} else if (memcmp(hp->name, ACCLAIM_MAGIC, 10) == 0) {
flags |= ACCLAIM_FLAG;
fprintf(stderr, "ACCLAIM_LOADER\n");
addr += ACCLAIM_PRE_HEADER_SZ;
}
switch (hp->header_version) {
case 1:
hdr = new dyn_img_v1(addr);
break;
case 2:
hdr = new dyn_img_v2(addr);
break;
case 3:
hdr = new dyn_img_v3(addr);
break;
default:
hdr = new dyn_img_v0(addr);
break;
}
}
if (char *id = hdr->id()) {
for (int i = SHA_DIGEST_SIZE + 4; i < SHA256_DIGEST_SIZE; ++i) {
if (id[i]) {
flags |= SHA256_FLAG;
break;
}
}
}
hdr->print();
size_t off = hdr->hdr_space();
hdr_addr = addr;
get_block(kernel);
get_block(ramdisk);
get_block(second);
get_block(extra);
get_block(recovery_dtbo);
get_block(dtb);
if (addr + off < map_addr + map_size) {
tail = addr + off;
tail_size = map_size - (tail - map_addr);
}
// Check tail info, currently only for LG Bump and Samsung SEANDROIDENFORCE
if (tail_size >= 16 && memcmp(tail, SEANDROID_MAGIC, 16) == 0) {
flags |= SEANDROID_FLAG;
} else if (tail_size >= 16 && memcmp(tail, LG_BUMP_MAGIC, 16) == 0) {
flags |= LG_BUMP_FLAG;
}
if (int dtb_off = find_dtb_offset(kernel, hdr->kernel_size()); dtb_off > 0) {
kernel_dtb = kernel + dtb_off;
kernel_dt_size = hdr->kernel_size() - dtb_off;
hdr->kernel_size() = dtb_off;
fprintf(stderr, "%-*s [%u]\n", PADDING, "KERNEL_DTB", kernel_dt_size);
}
if (auto size = hdr->kernel_size()) {
k_fmt = check_fmt_lg(kernel, size);
if (k_fmt == MTK) {
fprintf(stderr, "MTK_KERNEL_HDR\n");
flags |= MTK_KERNEL;
k_hdr = reinterpret_cast<mtk_hdr *>(kernel);
fprintf(stderr, "%-*s [%u]\n", PADDING, "KERNEL", k_hdr->size);
fprintf(stderr, "%-*s [%s]\n", PADDING, "NAME", k_hdr->name);
kernel += sizeof(mtk_hdr);
hdr->kernel_size() -= sizeof(mtk_hdr);
k_fmt = check_fmt_lg(kernel, hdr->kernel_size());
}
fprintf(stderr, "%-*s [%s]\n", PADDING, "KERNEL_FMT", fmt2name[k_fmt]);
}
if (auto size = hdr->ramdisk_size()) {
r_fmt = check_fmt_lg(ramdisk, size);
if (r_fmt == MTK) {
fprintf(stderr, "MTK_RAMDISK_HDR\n");
flags |= MTK_RAMDISK;
r_hdr = reinterpret_cast<mtk_hdr *>(ramdisk);
fprintf(stderr, "%-*s [%u]\n", PADDING, "RAMDISK", r_hdr->size);
fprintf(stderr, "%-*s [%s]\n", PADDING, "NAME", r_hdr->name);
ramdisk += sizeof(mtk_hdr);
hdr->ramdisk_size() -= sizeof(mtk_hdr);
r_fmt = check_fmt_lg(ramdisk, hdr->ramdisk_size());
}
fprintf(stderr, "%-*s [%s]\n", PADDING, "RAMDISK_FMT", fmt2name[r_fmt]);
}
if (auto size = hdr->extra_size()) {
e_fmt = check_fmt_lg(extra, size);
fprintf(stderr, "%-*s [%s]\n", PADDING, "EXTRA_FMT", fmt2name[e_fmt]);
}
}
int split_image_dtb(const char *filename) {
uint8_t *buf;
size_t sz;
mmap_ro(filename, buf, sz);
run_finally f([=]{ munmap(buf, sz); });
if (int off = find_dtb_offset(buf, sz); off > 0) {
format_t fmt = check_fmt_lg(buf, sz);
if (COMPRESSED(fmt)) {
int fd = creat(KERNEL_FILE, 0644);
decompress(fmt, fd, buf, off);
close(fd);
} else {
dump(buf, off, KERNEL_FILE);
}
dump(buf + off, sz - off, KER_DTB_FILE);
return 0;
} else {
fprintf(stderr, "Cannot find DTB in %s\n", filename);
return 1;
}
}
int unpack(const char *image, bool skip_decomp, bool hdr) {
boot_img boot(image);
if (hdr)
boot.hdr->dump_hdr_file();
// Dump kernel
if (!skip_decomp && COMPRESSED(boot.k_fmt)) {
int fd = creat(KERNEL_FILE, 0644);
decompress(boot.k_fmt, fd, boot.kernel, boot.hdr->kernel_size());
close(fd);
} else {
dump(boot.kernel, boot.hdr->kernel_size(), KERNEL_FILE);
}
// Dump kernel_dtb
dump(boot.kernel_dtb, boot.kernel_dt_size, KER_DTB_FILE);
// Dump ramdisk
if (!skip_decomp && COMPRESSED(boot.r_fmt)) {
int fd = creat(RAMDISK_FILE, 0644);
decompress(boot.r_fmt, fd, boot.ramdisk, boot.hdr->ramdisk_size());
close(fd);
} else {
dump(boot.ramdisk, boot.hdr->ramdisk_size(), RAMDISK_FILE);
}
// Dump second
dump(boot.second, boot.hdr->second_size(), SECOND_FILE);
// Dump extra
if (!skip_decomp && COMPRESSED(boot.e_fmt)) {
int fd = creat(EXTRA_FILE, 0644);
decompress(boot.e_fmt, fd, boot.extra, boot.hdr->extra_size());
close(fd);
} else {
dump(boot.extra, boot.hdr->extra_size(), EXTRA_FILE);
}
// Dump recovery_dtbo
dump(boot.recovery_dtbo, boot.hdr->recovery_dtbo_size(), RECV_DTBO_FILE);
// Dump dtb
dump(boot.dtb, boot.hdr->dtb_size(), DTB_FILE);
return (boot.flags & CHROMEOS_FLAG) ? 2 : 0;
}
#define file_align() \
write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR) - off.header, boot.hdr->page_size()))
void repack(const char* src_img, const char* out_img, bool skip_comp) {
boot_img boot(src_img);
auto is_flag = [&](unsigned flag) -> bool { return (boot.flags & flag); };
struct {
uint32_t header;
uint32_t kernel;
uint32_t ramdisk;
uint32_t second;
uint32_t extra;
uint32_t dtb;
uint32_t total;
} off;
fprintf(stderr, "Repack to boot image: [%s]\n", out_img);
// Reset sizes
boot.hdr->kernel_size() = 0;
boot.hdr->ramdisk_size() = 0;
boot.hdr->second_size() = 0;
boot.hdr->dtb_size() = 0;
boot.kernel_dt_size = 0;
if (access(HEADER_FILE, R_OK) == 0)
boot.hdr->load_hdr_file();
/*****************
* Writing blocks
*****************/
// Create new image
int fd = creat(out_img, 0644);
if (is_flag(DHTB_FLAG)) {
// Skip DHTB header
write_zero(fd, sizeof(dhtb_hdr));
} else if (is_flag(BLOB_FLAG)) {
restore_buf(fd, boot.map_addr, sizeof(blob_hdr));
} else if (is_flag(NOOKHD_FLAG)) {
restore_buf(fd, boot.map_addr, NOOKHD_PRE_HEADER_SZ);
} else if (is_flag(ACCLAIM_FLAG)) {
restore_buf(fd, boot.map_addr, ACCLAIM_PRE_HEADER_SZ);
}
// Copy header
off.header = lseek(fd, 0, SEEK_CUR);
restore_buf(fd, boot.hdr_addr, boot.hdr->hdr_space());
// kernel
off.kernel = lseek(fd, 0, SEEK_CUR);
if (is_flag(MTK_KERNEL)) {
// Copy MTK headers
restore_buf(fd, boot.k_hdr, sizeof(mtk_hdr));
}
if (access(KERNEL_FILE, R_OK) == 0) {
size_t raw_size;
void *raw_buf;
mmap_ro(KERNEL_FILE, raw_buf, raw_size);
if (!COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.k_fmt)) {
boot.hdr->kernel_size() = compress(boot.k_fmt, fd, raw_buf, raw_size);
} else {
boot.hdr->kernel_size() = xwrite(fd, raw_buf, raw_size);
}
munmap(raw_buf, raw_size);
}
// kernel dtb
if (access(KER_DTB_FILE, R_OK) == 0)
boot.hdr->kernel_size() += restore(fd, KER_DTB_FILE);
file_align();
// ramdisk
off.ramdisk = lseek(fd, 0, SEEK_CUR);
if (is_flag(MTK_RAMDISK)) {
// Copy MTK headers
restore_buf(fd, boot.r_hdr, sizeof(mtk_hdr));
}
if (access(RAMDISK_FILE, R_OK) == 0) {
size_t raw_size;
void *raw_buf;
mmap_ro(RAMDISK_FILE, raw_buf, raw_size);
if (!skip_comp && !COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.r_fmt)) {
boot.hdr->ramdisk_size() = compress(boot.r_fmt, fd, raw_buf, raw_size);
} else {
boot.hdr->ramdisk_size() = xwrite(fd, raw_buf, raw_size);
}
munmap(raw_buf, raw_size);
file_align();
}
// second
off.second = lseek(fd, 0, SEEK_CUR);
if (access(SECOND_FILE, R_OK) == 0) {
boot.hdr->second_size() = restore(fd, SECOND_FILE);
file_align();
}
// extra
off.extra = lseek(fd, 0, SEEK_CUR);
if (access(EXTRA_FILE, R_OK) == 0) {
size_t raw_size;
void *raw_buf;
mmap_ro(EXTRA_FILE, raw_buf, raw_size);
if (!skip_comp && !COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.e_fmt)) {
boot.hdr->extra_size() = compress(boot.e_fmt, fd, raw_buf, raw_size);
} else {
boot.hdr->extra_size() = xwrite(fd, raw_buf, raw_size);
}
munmap(raw_buf, raw_size);
file_align();
}
// recovery_dtbo
if (access(RECV_DTBO_FILE, R_OK) == 0) {
boot.hdr->recovery_dtbo_offset() = lseek(fd, 0, SEEK_CUR);
boot.hdr->recovery_dtbo_size() = restore(fd, RECV_DTBO_FILE);
file_align();
}
// dtb
off.dtb = lseek(fd, 0, SEEK_CUR);
if (access(DTB_FILE, R_OK) == 0) {
boot.hdr->dtb_size() = restore(fd, DTB_FILE);
file_align();
}
// Append tail info
if (is_flag(SEANDROID_FLAG)) {
restore_buf(fd, SEANDROID_MAGIC "\xFF\xFF\xFF\xFF", 20);
}
if (is_flag(LG_BUMP_FLAG)) {
restore_buf(fd, LG_BUMP_MAGIC, 16);
}
off.total = lseek(fd, 0, SEEK_CUR);
// Pad image to at least original size if not chromeos (as it requires post processing)
if (!is_flag(CHROMEOS_FLAG)) {
if (off.total < boot.map_size) {
int padding = boot.map_size - off.total;
write_zero(fd, padding);
}
}
close(fd);
/*********************
* Patching the image
*********************/
// Map output image as rw
munmap(boot.map_addr, boot.map_size);
mmap_rw(out_img, boot.map_addr, boot.map_size);
// MTK headers
if (is_flag(MTK_KERNEL)) {
auto hdr = reinterpret_cast<mtk_hdr *>(boot.map_addr + off.kernel);
hdr->size = boot.hdr->kernel_size();
boot.hdr->kernel_size() += sizeof(*hdr);
}
if (is_flag(MTK_RAMDISK)) {
auto hdr = reinterpret_cast<mtk_hdr *>(boot.map_addr + off.ramdisk);
hdr->size = boot.hdr->ramdisk_size();
boot.hdr->ramdisk_size() += sizeof(*hdr);
}
// Make sure header size matches
boot.hdr->header_size() = boot.hdr->hdr_size();
// Update checksum
if (char *id = boot.hdr->id()) {
HASH_CTX ctx;
is_flag(SHA256_FLAG) ? SHA256_init(&ctx) : SHA_init(&ctx);
uint32_t size = boot.hdr->kernel_size();
HASH_update(&ctx, boot.map_addr + off.kernel, size);
HASH_update(&ctx, &size, sizeof(size));
size = boot.hdr->ramdisk_size();
HASH_update(&ctx, boot.map_addr + off.ramdisk, size);
HASH_update(&ctx, &size, sizeof(size));
size = boot.hdr->second_size();
HASH_update(&ctx, boot.map_addr + off.second, size);
HASH_update(&ctx, &size, sizeof(size));
size = boot.hdr->extra_size();
if (size) {
HASH_update(&ctx, boot.map_addr + off.extra, size);
HASH_update(&ctx, &size, sizeof(size));
}
uint32_t ver = boot.hdr->header_version();
if (ver == 1 || ver == 2) {
size = boot.hdr->recovery_dtbo_size();
HASH_update(&ctx, boot.map_addr + boot.hdr->recovery_dtbo_offset(), size);
HASH_update(&ctx, &size, sizeof(size));
}
if (ver == 2) {
size = boot.hdr->dtb_size();
HASH_update(&ctx, boot.map_addr + off.dtb, size);
HASH_update(&ctx, &size, sizeof(size));
}
memset(id, 0, BOOT_ID_SIZE);
memcpy(id, HASH_final(&ctx), is_flag(SHA256_FLAG) ? SHA256_DIGEST_SIZE : SHA_DIGEST_SIZE);
}
// Print new image info
boot.hdr->print();
// Main header
memcpy(boot.map_addr + off.header, boot.hdr->raw_hdr(), boot.hdr->hdr_size());
if (is_flag(DHTB_FLAG)) {
// DHTB header
auto hdr = reinterpret_cast<dhtb_hdr *>(boot.map_addr);
memcpy(hdr, DHTB_MAGIC, 8);
hdr->size = off.total - sizeof(dhtb_hdr);
SHA256_hash(boot.map_addr + sizeof(dhtb_hdr), hdr->size, hdr->checksum);
} else if (is_flag(BLOB_FLAG)) {
// Blob header
auto hdr = reinterpret_cast<blob_hdr *>(boot.map_addr);
hdr->size = off.total - sizeof(blob_hdr);
}
}
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