forked from MarcoBuster/Magisk
552 lines
15 KiB
C++
552 lines
15 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.h>
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#include <logging.h>
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#include "bootimg.h"
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#include "magiskboot.h"
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#include "compress.h"
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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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static int64_t one_step(unique_ptr<Compression> &&ptr, int fd, const void *in, size_t size) {
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ptr->setOut(make_unique<FDOutStream>(fd));
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if (!ptr->write(in, size))
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return -1;
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return ptr->finalize();
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}
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static int64_t decompress(format_t type, int fd, const void *in, size_t size) {
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return one_step(unique_ptr<Compression>(get_decoder(type)), fd, in, size);
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}
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static int64_t compress(format_t type, int fd, const void *in, size_t size) {
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return one_step(unique_ptr<Compression>(get_encoder(type)), fd, in, size);
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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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static void restore_buf(int fd, const void *buf, size_t size) {
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xwrite(fd, buf, 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, "HEADER_VER [%u]\n", ver);
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fprintf(stderr, "KERNEL_SZ [%u]\n", kernel_size());
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fprintf(stderr, "RAMDISK_SZ [%u]\n", ramdisk_size());
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fprintf(stderr, "SECOND_SZ [%u]\n", second_size());
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if (ver) {
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fprintf(stderr, "RECOV_DTBO_SZ [%u]\n", recovery_dtbo_size());
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fprintf(stderr, "DTB [%u]\n", dtb_size());
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} else {
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fprintf(stderr, "EXTRA_SZ [%u]\n", extra_size());
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}
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ver = os_version();
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if (ver) {
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int a,b,c,y,m = 0;
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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(stderr, "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(stderr, "OS_PATCH_LEVEL [%d-%02d]\n", y, m);
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}
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fprintf(stderr, "PAGESIZE [%u]\n", page_size());
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fprintf(stderr, "NAME [%s]\n", name());
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fprintf(stderr, "CMDLINE [%.512s%.1024s]\n", cmdline(), extra_cmdline());
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fprintf(stderr, "CHECKSUM [");
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for (int i = 0; id()[i]; ++i)
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fprintf(stderr, "%02x", id()[i]);
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fprintf(stderr, "]\n");
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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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fprintf(fp, "name=%s\n", name());
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fprintf(fp, "cmdline=%.512s%.1024s\n", cmdline(), 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 = 0;
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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") {
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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, 512);
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memset(extra_cmdline(), 0, 1024);
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if (value.length() > 512) {
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memcpy(cmdline(), value.data(), 512);
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memcpy(extra_cmdline(), &value[512], value.length() - 511);
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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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switch (check_fmt(addr, map_size)) {
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case CHROMEOS:
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// chromeos require external signing
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flags |= CHROMEOS_FLAG;
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addr += 65535;
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break;
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case DHTB:
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flags |= (DHTB_FLAG | SEANDROID_FLAG);
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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;
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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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parse_image(addr);
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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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#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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void boot_img::parse_image(uint8_t *addr) {
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auto hp = reinterpret_cast<boot_img_hdr*>(addr);
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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 (memcmp(hp->cmdline, NOOKHD_RL_MAGIC, 10) == 0 ||
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memcmp(hp->cmdline, NOOKHD_GL_MAGIC, 12) == 0 ||
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memcmp(hp->cmdline, NOOKHD_GR_MAGIC, 14) == 0 ||
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memcmp(hp->cmdline, NOOKHD_EB_MAGIC, 26) == 0 ||
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memcmp(hp->cmdline, NOOKHD_ER_MAGIC, 30) == 0) {
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flags |= NOOKHD_FLAG;
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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;
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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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if (hp->header_version == 1)
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hdr = new dyn_img_v1(addr);
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else if (hp->header_version == 2)
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hdr = new dyn_img_v2(addr);
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else
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hdr = new dyn_img_v0(addr);
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}
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img_start = addr;
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flags |= hdr->id()[SHA_DIGEST_SIZE] ? SHA256_FLAG : 0;
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hdr->print();
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size_t off = hdr->page_size();
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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 (addr + off < map_addr + map_size) {
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tail = addr + off;
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tail_size = map_size - (tail - map_addr);
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}
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// Check tail info, currently only for LG Bump and Samsung SEANDROIDENFORCE
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if (tail_size >= 16 && memcmp(tail, SEANDROID_MAGIC, 16) == 0) {
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flags |= SEANDROID_FLAG;
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} else if (tail_size >= 16 && memcmp(tail, LG_BUMP_MAGIC, 16) == 0) {
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flags |= LG_BUMP_FLAG;
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}
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find_kernel_dtb();
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k_fmt = check_fmt(kernel, hdr->kernel_size());
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r_fmt = check_fmt(ramdisk, hdr->ramdisk_size());
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// Check MTK
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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;
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k_hdr = reinterpret_cast<mtk_hdr *>(kernel);
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fprintf(stderr, "KERNEL [%u]\n", k_hdr->size);
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fprintf(stderr, "NAME [%s]\n", 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(kernel, hdr->kernel_size());
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}
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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;
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r_hdr = reinterpret_cast<mtk_hdr *>(ramdisk);
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fprintf(stderr, "RAMDISK [%u]\n", r_hdr->size);
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fprintf(stderr, "NAME [%s]\n", 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(ramdisk, hdr->ramdisk_size());
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}
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fprintf(stderr, "KERNEL_FMT [%s]\n", fmt2name[k_fmt]);
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fprintf(stderr, "RAMDISK_FMT [%s]\n", fmt2name[r_fmt]);
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}
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void boot_img::find_kernel_dtb() {
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const int eof = static_cast<int>(hdr->kernel_size());
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for (int i = 0; i < eof - (int) sizeof(fdt_header); ++i) {
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auto fdt_hdr = reinterpret_cast<fdt_header *>(kernel + i);
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if (fdt32_to_cpu(fdt_hdr->magic) != FDT_MAGIC)
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continue;
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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 (totalsize + i > eof)
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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 (off_dt_struct + i > eof)
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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 *>(kernel + i + 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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kernel_dtb = kernel + i;
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kernel_dt_size = eof - i;
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hdr->kernel_size() = i;
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fprintf(stderr, "KERNEL_DTB [%u]\n", kernel_dt_size);
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break;
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}
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}
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int unpack(const char *image, 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 (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.kernel_dt_size, KER_DTB_FILE);
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// Dump ramdisk
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if (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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dump(boot.extra, boot.hdr->extra_size(), EXTRA_FILE);
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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 nocomp) {
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boot_img boot(src_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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} off;
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fprintf(stderr, "Repack to boot image: [%s]\n", out_img);
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// Reset sizes
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boot.hdr->kernel_size() = 0;
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boot.hdr->ramdisk_size() = 0;
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boot.hdr->second_size() = 0;
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boot.hdr->dtb_size() = 0;
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boot.kernel_dt_size = 0;
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if (access(HEADER_FILE, R_OK) == 0)
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boot.hdr->load_hdr_file();
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/*****************
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* Writing 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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restore_buf(fd, boot.map_addr, sizeof(blob_hdr));
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} else if (boot.flags & NOOKHD_FLAG) {
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restore_buf(fd, boot.map_addr, NOOKHD_PRE_HEADER_SZ);
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} else if (boot.flags & ACCLAIM_FLAG) {
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restore_buf(fd, boot.map_addr, ACCLAIM_PRE_HEADER_SZ);
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}
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// Copy a page for header
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off.header = lseek(fd, 0, SEEK_CUR);
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restore_buf(fd, boot.img_start, boot.hdr->page_size());
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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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restore_buf(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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boot.hdr->kernel_size() = compress(boot.k_fmt, fd, raw_buf, raw_size);
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} else {
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boot.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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boot.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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restore_buf(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 (!COMPRESSED_ANY(check_fmt(raw_buf, raw_size)) && COMPRESSED(boot.r_fmt) && !nocomp) {
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boot.hdr->ramdisk_size() = compress(boot.r_fmt, fd, raw_buf, raw_size);
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} else {
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boot.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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boot.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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boot.hdr->extra_size() = restore(fd, EXTRA_FILE);
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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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boot.hdr->recovery_dtbo_offset() = lseek(fd, 0, SEEK_CUR);
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boot.hdr->recovery_dtbo_size() = restore(fd, RECV_DTBO_FILE);
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file_align();
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}
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// 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 (boot.flags & SEANDROID_FLAG) {
|
|
restore_buf(fd, SEANDROID_MAGIC "\xFF\xFF\xFF\xFF", 20);
|
|
}
|
|
if (boot.flags & LG_BUMP_FLAG) {
|
|
restore_buf(fd, LG_BUMP_MAGIC, 16);
|
|
}
|
|
|
|
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 (boot.flags & 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 (boot.flags & 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);
|
|
}
|
|
|
|
// Update checksum
|
|
HASH_CTX ctx;
|
|
(boot.flags & 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));
|
|
}
|
|
if (boot.hdr->header_version()) {
|
|
size = boot.hdr->recovery_dtbo_size();
|
|
HASH_update(&ctx, boot.map_addr + boot.hdr->recovery_dtbo_offset(), size);
|
|
HASH_update(&ctx, &size, sizeof(size));
|
|
size = boot.hdr->dtb_size();
|
|
if (size) {
|
|
HASH_update(&ctx, boot.map_addr + off.dtb, size);
|
|
HASH_update(&ctx, &size, sizeof(size));
|
|
}
|
|
|
|
boot.hdr->header_size() = boot.hdr->hdr_size();
|
|
}
|
|
memset(boot.hdr->id(), 0, 32);
|
|
memcpy(boot.hdr->id(), HASH_final(&ctx),
|
|
(boot.flags & 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, boot.hdr->hdr_size());
|
|
|
|
if (boot.flags & DHTB_FLAG) {
|
|
// DHTB header
|
|
auto hdr = reinterpret_cast<dhtb_hdr *>(boot.map_addr);
|
|
memcpy(hdr, DHTB_MAGIC, 8);
|
|
hdr->size = boot.map_size - sizeof(dhtb_hdr);
|
|
SHA256_hash(boot.map_addr + sizeof(dhtb_hdr), hdr->size, hdr->checksum);
|
|
} else if (boot.flags & BLOB_FLAG) {
|
|
// Blob header
|
|
auto hdr = reinterpret_cast<blob_hdr *>(boot.map_addr);
|
|
hdr->size = boot.map_size - sizeof(blob_hdr);
|
|
}
|
|
}
|