forked from MarcoBuster/Magisk
309 lines
8.3 KiB
C
309 lines
8.3 KiB
C
#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "bootimg.h"
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#include "magiskboot.h"
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#include "utils.h"
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#include "logging.h"
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#define INSUF_BLOCK_RET 2
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#define CHROMEOS_RET 3
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#define ELF32_RET 4
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#define ELF64_RET 5
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static void dump(void *buf, size_t size, const char *filename) {
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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(const char *filename, int fd) {
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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, NULL, 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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static void print_hdr(const boot_img_hdr *hdr) {
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fprintf(stderr, "KERNEL [%d] @ 0x%08x\n", hdr->kernel_size, hdr->kernel_addr);
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fprintf(stderr, "RAMDISK [%d] @ 0x%08x\n", hdr->ramdisk_size, hdr->ramdisk_addr);
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fprintf(stderr, "SECOND [%d] @ 0x%08x\n", hdr->second_size, hdr->second_addr);
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fprintf(stderr, "EXTRA [%d] @ 0x%08x\n", hdr->extra_size, hdr->tags_addr);
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fprintf(stderr, "PAGESIZE [%d]\n", hdr->page_size);
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if (hdr->os_version != 0) {
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int a,b,c,y,m = 0;
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int os_version, os_patch_level;
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os_version = hdr->os_version >> 11;
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os_patch_level = hdr->os_version & 0x7ff;
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a = (os_version >> 14) & 0x7f;
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b = (os_version >> 7) & 0x7f;
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c = os_version & 0x7f;
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fprintf(stderr, "OS_VERSION [%d.%d.%d]\n", a, b, c);
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y = (os_patch_level >> 4) + 2000;
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m = os_patch_level & 0xf;
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fprintf(stderr, "PATCH_LEVEL [%d-%02d]\n", y, m);
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}
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fprintf(stderr, "NAME [%s]\n", hdr->name);
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fprintf(stderr, "CMDLINE [%s]\n", hdr->cmdline);
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}
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int parse_img(const char *image, boot_img *boot) {
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memset(boot, 0, sizeof(*boot));
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int is_blk = mmap_ro(image, &boot->map_addr, &boot->map_size);
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// Parse image
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fprintf(stderr, "Parsing boot image: [%s]\n", image);
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for (void *head = boot->map_addr; head < boot->map_addr + boot->map_size; head += 256) {
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size_t pos = 0;
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switch (check_type(head)) {
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case CHROMEOS:
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// The caller should know it's chromeos, as it needs additional signing
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boot->flags |= CHROMEOS_FLAG;
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continue;
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case ELF32:
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exit(ELF32_RET);
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case ELF64:
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exit(ELF64_RET);
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case AOSP:
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// Read the header
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memcpy(&boot->hdr, head + pos, sizeof(boot->hdr));
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pos += boot->hdr.page_size;
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print_hdr(&boot->hdr);
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boot->kernel = head + pos;
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pos += boot->hdr.kernel_size;
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mem_align(&pos, boot->hdr.page_size);
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boot->ramdisk = head + pos;
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pos += boot->hdr.ramdisk_size;
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mem_align(&pos, boot->hdr.page_size);
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if (boot->hdr.second_size) {
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boot->second = head + pos;
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pos += boot->hdr.second_size;
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mem_align(&pos, boot->hdr.page_size);
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}
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if (boot->hdr.extra_size) {
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boot->extra = head + pos;
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pos += boot->hdr.extra_size;
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mem_align(&pos, boot->hdr.page_size);
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}
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if (pos < boot->map_size) {
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boot->tail = head + pos;
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boot->tail_size = boot->map_size - pos;
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}
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// Search for dtb in kernel
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for (uint32_t i = 0; i < boot->hdr.kernel_size; ++i) {
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if (memcmp(boot->kernel + i, DTB_MAGIC, 4) == 0) {
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boot->dtb = boot->kernel + i;
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boot->dt_size = boot->hdr.kernel_size - i;
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boot->hdr.kernel_size = i;
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fprintf(stderr, "DTB [%u]\n", boot->dt_size);
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}
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}
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boot->ramdisk_type = check_type(boot->ramdisk);
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boot->kernel_type = check_type(boot->kernel);
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// Check MTK
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if (boot->kernel_type == MTK) {
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fprintf(stderr, "MTK_KERNEL_HDR [512]\n");
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boot->flags |= MTK_KERNEL;
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memcpy(&boot->mtk_kernel_hdr, boot->kernel, sizeof(mtk_hdr));
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boot->kernel += 512;
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boot->hdr.kernel_size -= 512;
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boot->kernel_type = check_type(boot->kernel);
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}
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if (boot->ramdisk_type == MTK) {
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fprintf(stderr, "MTK_RAMDISK_HDR [512]\n");
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boot->flags |= MTK_RAMDISK;
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memcpy(&boot->mtk_ramdisk_hdr, boot->ramdisk, sizeof(mtk_hdr));
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boot->ramdisk += 512;
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boot->hdr.ramdisk_size -= 512;
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boot->ramdisk_type = check_type(boot->ramdisk);
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}
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char fmt[16];
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get_type_name(boot->kernel_type, fmt);
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fprintf(stderr, "KERNEL_FMT [%s]\n", fmt);
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get_type_name(boot->ramdisk_type, fmt);
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fprintf(stderr, "RAMDISK_FMT [%s]\n", fmt);
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return boot->flags & CHROMEOS_FLAG ? CHROMEOS_RET :
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((is_blk && boot->tail_size < 500 * 1024) ? INSUF_BLOCK_RET : 0);
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default:
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continue;
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}
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}
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LOGE("No boot image magic found!\n");
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}
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void unpack(const char* image) {
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boot_img boot;
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int ret = parse_img(image, &boot);
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int fd;
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// Dump kernel
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if (COMPRESSED(boot.kernel_type)) {
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fd = creat(KERNEL_FILE, 0644);
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decomp(boot.kernel_type, 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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if (boot.dt_size) {
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// Dump dtb
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dump(boot.dtb, boot.dt_size, DTB_FILE);
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}
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// Dump ramdisk
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if (COMPRESSED(boot.ramdisk_type)) {
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fd = creat(RAMDISK_FILE, 0644);
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decomp(boot.ramdisk_type, 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 ".raw");
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LOGE("Unknown ramdisk format! Dumped to %s\n", RAMDISK_FILE ".raw");
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}
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if (boot.hdr.second_size) {
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// Dump second
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dump(boot.second, boot.hdr.second_size, SECOND_FILE);
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}
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if (boot.hdr.extra_size) {
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// Dump extra
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dump(boot.extra, boot.hdr.extra_size, EXTRA_FILE);
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}
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munmap(boot.map_addr, boot.map_size);
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exit(ret);
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}
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void repack(const char* orig_image, const char* out_image) {
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boot_img boot;
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// There are possible two MTK headers
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size_t mtk_kernel_off, mtk_ramdisk_off;
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// Parse original image
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parse_img(orig_image, &boot);
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fprintf(stderr, "Repack to boot image: [%s]\n", out_image);
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// Create new image
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int fd = creat(out_image, 0644);
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// Skip a page for header
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write_zero(fd, boot.hdr.page_size);
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if (boot.flags & MTK_KERNEL) {
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// Record position and skip MTK header
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mtk_kernel_off = lseek(fd, 0, SEEK_CUR);
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write_zero(fd, 512);
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}
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if (COMPRESSED(boot.kernel_type)) {
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size_t raw_size;
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void *kernel_raw;
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mmap_ro(KERNEL_FILE, &kernel_raw, &raw_size);
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boot.hdr.kernel_size = comp(boot.kernel_type, fd, kernel_raw, raw_size);
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munmap(kernel_raw, raw_size);
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} else {
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boot.hdr.kernel_size = restore(KERNEL_FILE, fd);
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}
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// Restore dtb
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if (boot.dt_size && access(DTB_FILE, R_OK) == 0) {
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boot.hdr.kernel_size += restore(DTB_FILE, fd);
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}
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file_align(fd, boot.hdr.page_size, 1);
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if (boot.flags & MTK_RAMDISK) {
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// Record position and skip MTK header
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mtk_ramdisk_off = lseek(fd, 0, SEEK_CUR);
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write_zero(fd, 512);
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}
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if (access(RAMDISK_FILE, R_OK) == 0) {
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// If we found raw cpio, compress to original format
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size_t cpio_size;
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void *cpio;
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mmap_ro(RAMDISK_FILE, &cpio, &cpio_size);
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boot.hdr.ramdisk_size = comp(boot.ramdisk_type, fd, cpio, cpio_size);
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munmap(cpio, cpio_size);
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} else {
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// Find compressed ramdisk
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char name[PATH_MAX];
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int found = 0;
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for (int i = 0; SUP_EXT_LIST[i]; ++i) {
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sprintf(name, "%s.%s", RAMDISK_FILE, SUP_EXT_LIST[i]);
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if (access(name, R_OK) == 0) {
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found = 1;
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break;
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}
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}
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if (!found)
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LOGE("No ramdisk exists!\n");
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boot.hdr.ramdisk_size = restore(name, fd);
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}
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file_align(fd, boot.hdr.page_size, 1);
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// Restore second
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if (boot.hdr.second_size && access(SECOND_FILE, R_OK) == 0) {
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boot.hdr.second_size = restore(SECOND_FILE, fd);
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file_align(fd, boot.hdr.page_size, 1);
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}
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// Restore extra
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if (boot.hdr.extra_size && access(EXTRA_FILE, R_OK) == 0) {
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boot.hdr.extra_size = restore(EXTRA_FILE, fd);
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file_align(fd, boot.hdr.page_size, 1);
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}
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// Check tail info, currently only for LG Bump and Samsung SEANDROIDENFORCE
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if (boot.tail_size >= 16) {
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if (memcmp(boot.tail, "SEANDROIDENFORCE", 16) == 0 ||
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memcmp(boot.tail, LG_BUMP_MAGIC, 16) == 0 ) {
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restore_buf(fd, boot.tail, 16);
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}
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}
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// Write MTK headers back
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if (boot.flags & MTK_KERNEL) {
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lseek(fd, mtk_kernel_off, SEEK_SET);
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boot.mtk_kernel_hdr.size = boot.hdr.kernel_size;
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boot.hdr.kernel_size += 512;
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restore_buf(fd, &boot.mtk_kernel_hdr, sizeof(mtk_hdr));
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}
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if (boot.flags & MTK_RAMDISK) {
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lseek(fd, mtk_ramdisk_off, SEEK_SET);
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boot.mtk_ramdisk_hdr.size = boot.hdr.ramdisk_size;
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boot.hdr.ramdisk_size += 512;
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restore_buf(fd, &boot.mtk_ramdisk_hdr, sizeof(mtk_hdr));
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}
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// Main header
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lseek(fd, 0, SEEK_SET);
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restore_buf(fd, &boot.hdr, sizeof(boot.hdr));
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// Print new image info
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print_hdr(&boot.hdr);
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munmap(boot.map_addr, boot.map_size);
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close(fd);
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}
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