mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-26 11:47:39 +00:00
695 lines
22 KiB
C++
695 lines
22 KiB
C++
#include <sys/mman.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <libfdt.h>
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#include <functional>
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#include <memory>
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#include <mincrypt/sha.h>
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#include <mincrypt/sha256.h>
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#include <utils.hpp>
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#include "bootimg.hpp"
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#include "magiskboot.hpp"
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#include "compress.hpp"
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using namespace std;
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uint32_t dyn_img_hdr::j32 = 0;
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uint64_t dyn_img_hdr::j64 = 0;
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#define PADDING 15
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static void decompress(format_t type, int fd, const void *in, size_t size) {
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auto ptr = get_decoder(type, make_unique<fd_stream>(fd));
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ptr->write(in, size);
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}
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static off_t compress(format_t type, int fd, const void *in, size_t size) {
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auto prev = lseek(fd, 0, SEEK_CUR);
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{
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auto strm = get_encoder(type, make_unique<fd_stream>(fd));
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strm->write(in, size);
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}
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auto now = lseek(fd, 0, SEEK_CUR);
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return now - prev;
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}
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static void dump(void *buf, size_t size, const char *filename) {
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if (size == 0)
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return;
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int fd = creat(filename, 0644);
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xwrite(fd, buf, size);
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close(fd);
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}
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static size_t restore(int fd, const char *filename) {
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int ifd = xopen(filename, O_RDONLY);
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size_t size = lseek(ifd, 0, SEEK_END);
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lseek(ifd, 0, SEEK_SET);
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xsendfile(fd, ifd, nullptr, size);
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close(ifd);
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return size;
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}
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void dyn_img_hdr::print() {
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uint32_t ver = header_version();
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fprintf(stderr, "%-*s [%u]\n", PADDING, "HEADER_VER", ver);
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fprintf(stderr, "%-*s [%u]\n", PADDING, "KERNEL_SZ", kernel_size());
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fprintf(stderr, "%-*s [%u]\n", PADDING, "RAMDISK_SZ", ramdisk_size());
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if (ver < 3)
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fprintf(stderr, "%-*s [%u]\n", PADDING, "SECOND_SZ", second_size());
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if (ver == 0)
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fprintf(stderr, "%-*s [%u]\n", PADDING, "EXTRA_SZ", extra_size());
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if (ver == 1 || ver == 2)
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fprintf(stderr, "%-*s [%u]\n", PADDING, "RECOV_DTBO_SZ", recovery_dtbo_size());
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if (ver == 2)
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fprintf(stderr, "%-*s [%u]\n", PADDING, "DTB_SZ", dtb_size());
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if (uint32_t os_ver = os_version()) {
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int a,b,c,y,m = 0;
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int version = os_ver >> 11;
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int patch_level = os_ver & 0x7ff;
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a = (version >> 14) & 0x7f;
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b = (version >> 7) & 0x7f;
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c = version & 0x7f;
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fprintf(stderr, "%-*s [%d.%d.%d]\n", PADDING, "OS_VERSION", a, b, c);
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y = (patch_level >> 4) + 2000;
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m = patch_level & 0xf;
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fprintf(stderr, "%-*s [%d-%02d]\n", PADDING, "OS_PATCH_LEVEL", y, m);
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}
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fprintf(stderr, "%-*s [%u]\n", PADDING, "PAGESIZE", page_size());
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if (ver < 3) {
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fprintf(stderr, "%-*s [%s]\n", PADDING, "NAME", name());
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}
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fprintf(stderr, "%-*s [%.*s%.*s]\n", PADDING, "CMDLINE",
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BOOT_ARGS_SIZE, cmdline(), BOOT_EXTRA_ARGS_SIZE, extra_cmdline());
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if (auto chksum = reinterpret_cast<uint8_t*>(id())) {
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fprintf(stderr, "%-*s [", PADDING, "CHECKSUM");
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for (int i = 0; i < SHA256_DIGEST_SIZE; ++i)
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fprintf(stderr, "%02hhx", chksum[i]);
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fprintf(stderr, "]\n");
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}
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}
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void dyn_img_hdr::dump_hdr_file() {
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FILE *fp = xfopen(HEADER_FILE, "w");
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fprintf(fp, "pagesize=%u\n", page_size());
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if (name())
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fprintf(fp, "name=%s\n", name());
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fprintf(fp, "cmdline=%.*s%.*s\n", BOOT_ARGS_SIZE, cmdline(), BOOT_EXTRA_ARGS_SIZE, extra_cmdline());
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uint32_t ver = os_version();
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if (ver) {
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int a, b, c, y, m;
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int version, patch_level;
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version = ver >> 11;
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patch_level = ver & 0x7ff;
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a = (version >> 14) & 0x7f;
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b = (version >> 7) & 0x7f;
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c = version & 0x7f;
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fprintf(fp, "os_version=%d.%d.%d\n", a, b, c);
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y = (patch_level >> 4) + 2000;
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m = patch_level & 0xf;
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fprintf(fp, "os_patch_level=%d-%02d\n", y, m);
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}
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fclose(fp);
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}
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void dyn_img_hdr::load_hdr_file() {
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parse_prop_file(HEADER_FILE, [=](string_view key, string_view value) -> bool {
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if (key == "page_size") {
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page_size() = parse_int(value);
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} else if (key == "name" && name()) {
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memset(name(), 0, 16);
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memcpy(name(), value.data(), value.length() > 15 ? 15 : value.length());
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} else if (key == "cmdline") {
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memset(cmdline(), 0, BOOT_ARGS_SIZE);
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memset(extra_cmdline(), 0, BOOT_EXTRA_ARGS_SIZE);
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if (value.length() > BOOT_ARGS_SIZE) {
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memcpy(cmdline(), value.data(), BOOT_ARGS_SIZE);
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auto len = std::min(value.length() - BOOT_ARGS_SIZE, (size_t) BOOT_EXTRA_ARGS_SIZE);
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memcpy(extra_cmdline(), &value[BOOT_ARGS_SIZE], len);
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} else {
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memcpy(cmdline(), value.data(), value.length());
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}
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} else if (key == "os_version") {
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int patch_level = os_version() & 0x7ff;
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int a, b, c;
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sscanf(value.data(), "%d.%d.%d", &a, &b, &c);
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os_version() = (((a << 14) | (b << 7) | c) << 11) | patch_level;
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} else if (key == "os_patch_level") {
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int os_ver = os_version() >> 11;
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int y, m;
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sscanf(value.data(), "%d-%d", &y, &m);
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y -= 2000;
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os_version() = (os_ver << 11) | (y << 4) | m;
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}
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return true;
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});
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}
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boot_img::boot_img(const char *image) {
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mmap_ro(image, map_addr, map_size);
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fprintf(stderr, "Parsing boot image: [%s]\n", image);
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for (uint8_t *addr = map_addr; addr < map_addr + map_size; ++addr) {
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format_t fmt = check_fmt(addr, map_size);
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switch (fmt) {
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case CHROMEOS:
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// chromeos require external signing
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flags[CHROMEOS_FLAG] = true;
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addr += 65535;
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break;
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case DHTB:
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flags[DHTB_FLAG] = true;
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flags[SEANDROID_FLAG] = true;
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fprintf(stderr, "DHTB_HDR\n");
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addr += sizeof(dhtb_hdr) - 1;
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break;
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case BLOB:
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flags[BLOB_FLAG] = true;
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fprintf(stderr, "TEGRA_BLOB\n");
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addr += sizeof(blob_hdr) - 1;
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break;
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case AOSP:
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case AOSP_VENDOR:
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parse_image(addr, fmt);
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return;
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default:
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break;
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}
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}
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exit(1);
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}
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boot_img::~boot_img() {
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munmap(map_addr, map_size);
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delete hdr;
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}
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static int find_dtb_offset(uint8_t *buf, unsigned sz) {
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uint8_t * const end = buf + sz;
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for (uint8_t *curr = buf; curr < end; curr += sizeof(fdt_header)) {
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curr = static_cast<uint8_t*>(memmem(curr, end - curr, DTB_MAGIC, sizeof(fdt32_t)));
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if (curr == nullptr)
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return -1;
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auto fdt_hdr = reinterpret_cast<fdt_header *>(curr);
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// Check that fdt_header.totalsize does not overflow kernel image size
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uint32_t totalsize = fdt32_to_cpu(fdt_hdr->totalsize);
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if (curr + totalsize > end)
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continue;
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// Check that fdt_header.off_dt_struct does not overflow kernel image size
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uint32_t off_dt_struct = fdt32_to_cpu(fdt_hdr->off_dt_struct);
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if (curr + off_dt_struct > end)
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continue;
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// Check that fdt_node_header.tag of first node is FDT_BEGIN_NODE
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auto fdt_node_hdr = reinterpret_cast<fdt_node_header *>(curr + off_dt_struct);
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if (fdt32_to_cpu(fdt_node_hdr->tag) != FDT_BEGIN_NODE)
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continue;
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return curr - buf;
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}
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return -1;
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}
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static format_t check_fmt_lg(uint8_t *buf, unsigned sz) {
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format_t fmt = check_fmt(buf, sz);
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if (fmt == LZ4_LEGACY) {
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// We need to check if it is LZ4_LG
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unsigned off = 4;
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unsigned block_sz;
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while (off + sizeof(block_sz) <= sz) {
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memcpy(&block_sz, buf + off, sizeof(block_sz));
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off += sizeof(block_sz);
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if (off + block_sz > sz)
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return LZ4_LG;
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off += block_sz;
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}
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}
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return fmt;
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}
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#define get_block(name) {\
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name = addr + off; \
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off += hdr->name##_size(); \
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off = do_align(off, hdr->page_size()); \
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}
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#define CMD_MATCH(s) BUFFER_MATCH(hp->cmdline, s)
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void boot_img::parse_image(uint8_t *addr, format_t type) {
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auto hp = reinterpret_cast<boot_img_hdr*>(addr);
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if (type == AOSP_VENDOR) {
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fprintf(stderr, "VENDOR_BOOT_HDR\n");
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hdr = new dyn_img_vnd_v3(addr);
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} else if (hp->page_size >= 0x02000000) {
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fprintf(stderr, "PXA_BOOT_HDR\n");
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hdr = new dyn_img_pxa(addr);
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} else {
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if (CMD_MATCH(NOOKHD_RL_MAGIC) ||
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CMD_MATCH(NOOKHD_GL_MAGIC) ||
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CMD_MATCH(NOOKHD_GR_MAGIC) ||
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CMD_MATCH(NOOKHD_EB_MAGIC) ||
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CMD_MATCH(NOOKHD_ER_MAGIC)) {
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flags[NOOKHD_FLAG] = true;
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fprintf(stderr, "NOOKHD_LOADER\n");
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addr += NOOKHD_PRE_HEADER_SZ;
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} else if (memcmp(hp->name, ACCLAIM_MAGIC, 10) == 0) {
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flags[ACCLAIM_FLAG] = true;
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fprintf(stderr, "ACCLAIM_LOADER\n");
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addr += ACCLAIM_PRE_HEADER_SZ;
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}
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switch (hp->header_version) {
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case 1:
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hdr = new dyn_img_v1(addr);
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break;
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case 2:
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hdr = new dyn_img_v2(addr);
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break;
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case 3:
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hdr = new dyn_img_v3(addr);
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break;
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default:
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hdr = new dyn_img_v0(addr);
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break;
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}
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}
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if (char *id = hdr->id()) {
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for (int i = SHA_DIGEST_SIZE + 4; i < SHA256_DIGEST_SIZE; ++i) {
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if (id[i]) {
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flags[SHA256_FLAG] = true;
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break;
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}
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}
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}
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hdr->print();
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size_t off = hdr->hdr_space();
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hdr_addr = addr;
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get_block(kernel);
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get_block(ramdisk);
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get_block(second);
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get_block(extra);
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get_block(recovery_dtbo);
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get_block(dtb);
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if (int dtb_off = find_dtb_offset(kernel, hdr->kernel_size()); dtb_off > 0) {
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kernel_dtb = kernel + dtb_off;
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hdr->kernel_dt_size = hdr->kernel_size() - dtb_off;
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hdr->kernel_size() = dtb_off;
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fprintf(stderr, "%-*s [%u]\n", PADDING, "KERNEL_DTB_SZ", hdr->kernel_dt_size);
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}
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if (auto size = hdr->kernel_size()) {
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k_fmt = check_fmt_lg(kernel, size);
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if (k_fmt == MTK) {
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fprintf(stderr, "MTK_KERNEL_HDR\n");
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flags[MTK_KERNEL] = true;
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k_hdr = reinterpret_cast<mtk_hdr *>(kernel);
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fprintf(stderr, "%-*s [%u]\n", PADDING, "SIZE", k_hdr->size);
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fprintf(stderr, "%-*s [%s]\n", PADDING, "NAME", k_hdr->name);
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kernel += sizeof(mtk_hdr);
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hdr->kernel_size() -= sizeof(mtk_hdr);
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k_fmt = check_fmt_lg(kernel, hdr->kernel_size());
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}
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fprintf(stderr, "%-*s [%s]\n", PADDING, "KERNEL_FMT", fmt2name[k_fmt]);
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}
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if (auto size = hdr->ramdisk_size()) {
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r_fmt = check_fmt_lg(ramdisk, size);
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if (r_fmt == MTK) {
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fprintf(stderr, "MTK_RAMDISK_HDR\n");
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flags[MTK_RAMDISK] = true;
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r_hdr = reinterpret_cast<mtk_hdr *>(ramdisk);
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fprintf(stderr, "%-*s [%u]\n", PADDING, "SIZE", r_hdr->size);
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fprintf(stderr, "%-*s [%s]\n", PADDING, "NAME", r_hdr->name);
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ramdisk += sizeof(mtk_hdr);
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hdr->ramdisk_size() -= sizeof(mtk_hdr);
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r_fmt = check_fmt_lg(ramdisk, hdr->ramdisk_size());
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}
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fprintf(stderr, "%-*s [%s]\n", PADDING, "RAMDISK_FMT", fmt2name[r_fmt]);
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}
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if (auto size = hdr->extra_size()) {
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e_fmt = check_fmt_lg(extra, size);
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fprintf(stderr, "%-*s [%s]\n", PADDING, "EXTRA_FMT", fmt2name[e_fmt]);
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}
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if (addr + off < map_addr + map_size) {
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tail = addr + off;
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tail_size = map_addr + map_size - tail;
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// Check special flags
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if (tail_size >= 16 && BUFFER_MATCH(tail, SEANDROID_MAGIC)) {
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fprintf(stderr, "SAMSUNG_SEANDROID\n");
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flags[SEANDROID_FLAG] = true;
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} else if (tail_size >= 16 && BUFFER_MATCH(tail, LG_BUMP_MAGIC)) {
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fprintf(stderr, "LG_BUMP_IMAGE\n");
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flags[LG_BUMP_FLAG] = true;
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}
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// Find AVB structures
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void *meta = memmem(tail, tail_size, AVB_MAGIC, AVB_MAGIC_LEN);
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if (meta) {
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// Double check if footer exists
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void *footer = tail + tail_size - sizeof(AvbFooter);
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if (BUFFER_MATCH(footer, AVB_FOOTER_MAGIC)) {
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fprintf(stderr, "VBMETA\n");
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flags[AVB_FLAG] = true;
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avb_meta = reinterpret_cast<AvbVBMetaImageHeader*>(meta);
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avb_footer = reinterpret_cast<AvbFooter*>(footer);
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}
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}
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}
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}
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int split_image_dtb(const char *filename) {
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uint8_t *buf;
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size_t sz;
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mmap_ro(filename, buf, sz);
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run_finally f([=]{ munmap(buf, sz); });
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if (int off = find_dtb_offset(buf, sz); off > 0) {
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format_t fmt = check_fmt_lg(buf, sz);
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if (COMPRESSED(fmt)) {
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int fd = creat(KERNEL_FILE, 0644);
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decompress(fmt, fd, buf, off);
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close(fd);
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} else {
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dump(buf, off, KERNEL_FILE);
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}
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dump(buf + off, sz - off, KER_DTB_FILE);
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return 0;
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} else {
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fprintf(stderr, "Cannot find DTB in %s\n", filename);
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return 1;
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}
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}
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int unpack(const char *image, bool skip_decomp, bool hdr) {
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boot_img boot(image);
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if (hdr)
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boot.hdr->dump_hdr_file();
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// Dump kernel
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if (!skip_decomp && COMPRESSED(boot.k_fmt)) {
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int fd = creat(KERNEL_FILE, 0644);
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decompress(boot.k_fmt, fd, boot.kernel, boot.hdr->kernel_size());
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close(fd);
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} else {
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dump(boot.kernel, boot.hdr->kernel_size(), KERNEL_FILE);
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}
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// Dump kernel_dtb
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dump(boot.kernel_dtb, boot.hdr->kernel_dt_size, KER_DTB_FILE);
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// Dump ramdisk
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if (!skip_decomp && COMPRESSED(boot.r_fmt)) {
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int fd = creat(RAMDISK_FILE, 0644);
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decompress(boot.r_fmt, fd, boot.ramdisk, boot.hdr->ramdisk_size());
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close(fd);
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} else {
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dump(boot.ramdisk, boot.hdr->ramdisk_size(), RAMDISK_FILE);
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}
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// Dump second
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dump(boot.second, boot.hdr->second_size(), SECOND_FILE);
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// Dump extra
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if (!skip_decomp && COMPRESSED(boot.e_fmt)) {
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int fd = creat(EXTRA_FILE, 0644);
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decompress(boot.e_fmt, fd, boot.extra, boot.hdr->extra_size());
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close(fd);
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} else {
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dump(boot.extra, boot.hdr->extra_size(), EXTRA_FILE);
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}
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// Dump recovery_dtbo
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dump(boot.recovery_dtbo, boot.hdr->recovery_dtbo_size(), RECV_DTBO_FILE);
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// Dump dtb
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dump(boot.dtb, boot.hdr->dtb_size(), DTB_FILE);
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return boot.flags[CHROMEOS_FLAG] ? 2 : 0;
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}
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#define file_align() \
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write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR) - off.header, boot.hdr->page_size()))
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void repack(const char *src_img, const char *out_img, bool skip_comp) {
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const boot_img boot(src_img);
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fprintf(stderr, "Repack to boot image: [%s]\n", out_img);
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struct {
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uint32_t header;
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uint32_t kernel;
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uint32_t ramdisk;
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uint32_t second;
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uint32_t extra;
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uint32_t dtb;
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uint32_t total;
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uint32_t vbmeta;
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} off{};
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// Create a new boot header and reset sizes
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auto hdr = boot.hdr->clone();
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hdr->kernel_size() = 0;
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hdr->ramdisk_size() = 0;
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hdr->second_size() = 0;
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hdr->dtb_size() = 0;
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hdr->kernel_dt_size = 0;
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if (access(HEADER_FILE, R_OK) == 0)
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hdr->load_hdr_file();
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/***************
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* Write blocks
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***************/
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// Create new image
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int fd = creat(out_img, 0644);
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if (boot.flags[DHTB_FLAG]) {
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// Skip DHTB header
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write_zero(fd, sizeof(dhtb_hdr));
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} else if (boot.flags[BLOB_FLAG]) {
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xwrite(fd, boot.map_addr, sizeof(blob_hdr));
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} else if (boot.flags[NOOKHD_FLAG]) {
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xwrite(fd, boot.map_addr, NOOKHD_PRE_HEADER_SZ);
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} else if (boot.flags[ACCLAIM_FLAG]) {
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xwrite(fd, boot.map_addr, ACCLAIM_PRE_HEADER_SZ);
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}
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// Copy raw header
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off.header = lseek(fd, 0, SEEK_CUR);
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xwrite(fd, boot.hdr_addr, hdr->hdr_space());
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// kernel
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off.kernel = lseek(fd, 0, SEEK_CUR);
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if (boot.flags[MTK_KERNEL]) {
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// Copy MTK headers
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xwrite(fd, boot.k_hdr, sizeof(mtk_hdr));
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}
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if (access(KERNEL_FILE, R_OK) == 0) {
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size_t raw_size;
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void *raw_buf;
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mmap_ro(KERNEL_FILE, raw_buf, raw_size);
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if (!COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.k_fmt)) {
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hdr->kernel_size() = compress(boot.k_fmt, fd, raw_buf, raw_size);
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} else {
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hdr->kernel_size() = xwrite(fd, raw_buf, raw_size);
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}
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munmap(raw_buf, raw_size);
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}
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// kernel dtb
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if (access(KER_DTB_FILE, R_OK) == 0)
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hdr->kernel_size() += restore(fd, KER_DTB_FILE);
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file_align();
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// ramdisk
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off.ramdisk = lseek(fd, 0, SEEK_CUR);
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if (boot.flags[MTK_RAMDISK]) {
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// Copy MTK headers
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xwrite(fd, boot.r_hdr, sizeof(mtk_hdr));
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}
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if (access(RAMDISK_FILE, R_OK) == 0) {
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size_t raw_size;
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void *raw_buf;
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mmap_ro(RAMDISK_FILE, raw_buf, raw_size);
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if (!skip_comp && !COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.r_fmt)) {
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hdr->ramdisk_size() = compress(boot.r_fmt, fd, raw_buf, raw_size);
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} else {
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hdr->ramdisk_size() = xwrite(fd, raw_buf, raw_size);
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}
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munmap(raw_buf, raw_size);
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file_align();
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}
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// second
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off.second = lseek(fd, 0, SEEK_CUR);
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if (access(SECOND_FILE, R_OK) == 0) {
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hdr->second_size() = restore(fd, SECOND_FILE);
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file_align();
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}
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// extra
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off.extra = lseek(fd, 0, SEEK_CUR);
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if (access(EXTRA_FILE, R_OK) == 0) {
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size_t raw_size;
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void *raw_buf;
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mmap_ro(EXTRA_FILE, raw_buf, raw_size);
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if (!skip_comp && !COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.e_fmt)) {
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hdr->extra_size() = compress(boot.e_fmt, fd, raw_buf, raw_size);
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} else {
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hdr->extra_size() = xwrite(fd, raw_buf, raw_size);
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}
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munmap(raw_buf, raw_size);
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file_align();
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}
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// recovery_dtbo
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if (access(RECV_DTBO_FILE, R_OK) == 0) {
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hdr->recovery_dtbo_offset() = lseek(fd, 0, SEEK_CUR);
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hdr->recovery_dtbo_size() = restore(fd, RECV_DTBO_FILE);
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file_align();
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}
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// dtb
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off.dtb = lseek(fd, 0, SEEK_CUR);
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if (access(DTB_FILE, R_OK) == 0) {
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hdr->dtb_size() = restore(fd, DTB_FILE);
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file_align();
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}
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// Proprietary stuffs
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if (boot.flags[SEANDROID_FLAG]) {
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xwrite(fd, SEANDROID_MAGIC, 16);
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if (boot.flags[DHTB_FLAG]) {
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xwrite(fd, "\xFF\xFF\xFF\xFF", 4);
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}
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} else if (boot.flags[LG_BUMP_FLAG]) {
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xwrite(fd, LG_BUMP_MAGIC, 16);
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}
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off.total = lseek(fd, 0, SEEK_CUR);
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file_align();
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// vbmeta
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off.vbmeta = lseek(fd, 0, SEEK_CUR);
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if (boot.flags[AVB_FLAG]) {
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uint64_t vbmeta_size = __builtin_bswap64(boot.avb_footer->vbmeta_size);
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xwrite(fd, boot.avb_meta, vbmeta_size);
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}
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// Pad image to original size if not chromeos (as it requires post processing)
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if (!boot.flags[CHROMEOS_FLAG]) {
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off_t current = lseek(fd, 0, SEEK_CUR);
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if (current < boot.map_size) {
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write_zero(fd, boot.map_size - current);
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}
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}
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close(fd);
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/******************
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* Patch the image
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******************/
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// Map output image as rw
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uint8_t *new_addr;
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size_t new_size;
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mmap_rw(out_img, new_addr, new_size);
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// MTK headers
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if (boot.flags[MTK_KERNEL]) {
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auto m_hdr = reinterpret_cast<mtk_hdr *>(new_addr + off.kernel);
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m_hdr->size = hdr->kernel_size();
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hdr->kernel_size() += sizeof(mtk_hdr);
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}
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if (boot.flags[MTK_RAMDISK]) {
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auto m_hdr = reinterpret_cast<mtk_hdr *>(new_addr + off.ramdisk);
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m_hdr->size = hdr->ramdisk_size();
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hdr->ramdisk_size() += sizeof(mtk_hdr);
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}
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// Make sure header size matches
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hdr->header_size() = hdr->hdr_size();
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// Update checksum
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if (char *id = hdr->id()) {
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HASH_CTX ctx;
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boot.flags[SHA256_FLAG] ? SHA256_init(&ctx) : SHA_init(&ctx);
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uint32_t size = hdr->kernel_size();
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HASH_update(&ctx, new_addr + off.kernel, size);
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HASH_update(&ctx, &size, sizeof(size));
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size = hdr->ramdisk_size();
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HASH_update(&ctx, new_addr + off.ramdisk, size);
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HASH_update(&ctx, &size, sizeof(size));
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size = hdr->second_size();
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HASH_update(&ctx, new_addr + off.second, size);
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HASH_update(&ctx, &size, sizeof(size));
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size = hdr->extra_size();
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if (size) {
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HASH_update(&ctx, new_addr + off.extra, size);
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HASH_update(&ctx, &size, sizeof(size));
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}
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uint32_t ver = hdr->header_version();
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if (ver == 1 || ver == 2) {
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size = hdr->recovery_dtbo_size();
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HASH_update(&ctx, new_addr + hdr->recovery_dtbo_offset(), size);
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HASH_update(&ctx, &size, sizeof(size));
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}
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if (ver == 2) {
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size = hdr->dtb_size();
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HASH_update(&ctx, new_addr + off.dtb, size);
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HASH_update(&ctx, &size, sizeof(size));
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}
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memset(id, 0, BOOT_ID_SIZE);
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memcpy(id, HASH_final(&ctx), boot.flags[SHA256_FLAG] ? SHA256_DIGEST_SIZE : SHA_DIGEST_SIZE);
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}
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// Print new header info
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hdr->print();
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// Copy main header
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memcpy(new_addr + off.header, hdr->raw_hdr(), hdr->hdr_size());
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if (boot.flags[AVB_FLAG]) {
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// Copy and patch AVB structures
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auto footer = reinterpret_cast<AvbFooter*>(new_addr + new_size - sizeof(AvbFooter));
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auto vbmeta = reinterpret_cast<AvbVBMetaImageHeader*>(new_addr + off.vbmeta);
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memcpy(footer, boot.avb_footer, sizeof(AvbFooter));
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footer->original_image_size = __builtin_bswap64(off.total);
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footer->vbmeta_offset = __builtin_bswap64(off.vbmeta);
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vbmeta->flags = __builtin_bswap32(3);
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}
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if (boot.flags[DHTB_FLAG]) {
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// DHTB header
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auto d_hdr = reinterpret_cast<dhtb_hdr *>(new_addr);
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memcpy(d_hdr, DHTB_MAGIC, 8);
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d_hdr->size = off.total - sizeof(dhtb_hdr);
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SHA256_hash(new_addr + sizeof(dhtb_hdr), d_hdr->size, d_hdr->checksum);
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} else if (boot.flags[BLOB_FLAG]) {
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// Blob header
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auto b_hdr = reinterpret_cast<blob_hdr *>(new_addr);
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b_hdr->size = off.total - sizeof(blob_hdr);
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}
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munmap(new_addr, new_size);
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}
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