mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 10:35:26 +00:00
311 lines
7.3 KiB
C
311 lines
7.3 KiB
C
#include "bootimg.h"
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#include "magiskboot.h"
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static unsigned char *kernel, *ramdisk, *second, *dtb, *extra;
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static boot_img_hdr hdr;
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static int mtk_kernel = 0, mtk_ramdisk = 0;
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static file_t ramdisk_type;
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static void dump(unsigned char *buf, size_t size, const char *filename) {
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int fd = open_new(filename);
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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_info() {
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printf("KERNEL [%d] @ 0x%08x\n", hdr.kernel_size, hdr.kernel_addr);
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printf("RAMDISK [%d] @ 0x%08x\n", hdr.ramdisk_size, hdr.ramdisk_addr);
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printf("SECOND [%d] @ 0x%08x\n", hdr.second_size, hdr.second_addr);
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printf("DTB [%d] @ 0x%08x\n", hdr.dt_size, hdr.tags_addr);
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printf("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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printf("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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printf("PATCH_LEVEL [%d-%02d]\n", y, m);
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}
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printf("NAME [%s]\n", hdr.name);
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printf("CMDLINE [%s]\n", hdr.cmdline);
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switch (ramdisk_type) {
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case GZIP:
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printf("COMPRESSION [%s]\n", "gzip");
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break;
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case XZ:
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printf("COMPRESSION [%s]\n", "xz");
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break;
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case LZMA:
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printf("COMPRESSION [%s]\n", "lzma");
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break;
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case BZIP2:
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printf("COMPRESSION [%s]\n", "bzip2");
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break;
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case LZ4:
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printf("COMPRESSION [%s]\n", "lz4");
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break;
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case LZ4_LEGACY:
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printf("COMPRESSION [%s]\n", "lz4_legacy");
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break;
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default:
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fprintf(stderr, "Unknown ramdisk format!\n");
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}
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printf("\n");
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}
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int parse_img(unsigned char *orig, size_t size) {
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unsigned char *base, *end;
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size_t pos = 0;
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int ret = 0;
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for(base = orig, end = orig + size; base < end; base += 256, size -= 256) {
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switch (check_type(base)) {
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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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ret = 2;
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continue;
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case ELF32:
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exit(3);
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case ELF64:
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exit(4);
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case AOSP:
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// Read the header
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memcpy(&hdr, base, sizeof(hdr));
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pos += hdr.page_size;
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// Kernel position
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kernel = base + pos;
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pos += hdr.kernel_size;
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mem_align(&pos, hdr.page_size);
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// Ramdisk position
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ramdisk = base + pos;
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pos += hdr.ramdisk_size;
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mem_align(&pos, hdr.page_size);
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if (hdr.second_size) {
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// Second position
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second = base + pos;
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pos += hdr.second_size;
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mem_align(&pos, hdr.page_size);
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}
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if (hdr.dt_size) {
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// dtb position
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dtb = base + pos;
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pos += hdr.dt_size;
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mem_align(&pos, hdr.page_size);
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}
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if (pos < size) {
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extra = base + pos;
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}
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// Check ramdisk compression type
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ramdisk_type = check_type(ramdisk);
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// Check MTK
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if (check_type(kernel) == MTK) {
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printf("MTK header found in kernel\n");
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mtk_kernel = 1;
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}
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if (ramdisk_type == MTK) {
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printf("MTK header found in ramdisk\n");
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mtk_ramdisk = 1;
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ramdisk_type = check_type(ramdisk + 512);
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}
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// Print info
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print_info();
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return ret;
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default:
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continue;
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}
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}
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LOGE(1, "No boot image magic found!\n");
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}
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void unpack(const char* image) {
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size_t size;
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unsigned char *orig;
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mmap_ro(image, &orig, &size);
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// Parse image
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printf("Parsing boot image: [%s]\n\n", image);
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int ret = parse_img(orig, size);
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// Dump kernel
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if (mtk_kernel) {
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kernel += 512;
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hdr.kernel_size -= 512;
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}
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dump(kernel, hdr.kernel_size, KERNEL_FILE);
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// Dump ramdisk
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if (mtk_ramdisk) {
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ramdisk += 512;
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hdr.ramdisk_size -= 512;
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}
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if (decomp(ramdisk_type, RAMDISK_FILE, ramdisk, hdr.ramdisk_size)) {
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// Dump the compressed ramdisk
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dump(ramdisk, hdr.ramdisk_size, RAMDISK_FILE ".unsupport");
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LOGE(1, "Unsupported ramdisk format! Dumped to %s\n", RAMDISK_FILE ".unsupport");
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}
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if (hdr.second_size) {
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// Dump second
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dump(second, hdr.second_size, SECOND_FILE);
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}
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if (hdr.dt_size) {
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// Dump dtb
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dump(dtb, hdr.dt_size, DTB_FILE);
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}
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munmap(orig, 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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size_t size;
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unsigned char *orig;
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char name[PATH_MAX];
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// There are possible two MTK headers
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mtk_hdr mtk_kernel_hdr, mtk_ramdisk_hdr;
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size_t mtk_kernel_off, mtk_ramdisk_off;
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// Load original image
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mmap_ro(orig_image, &orig, &size);
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// Parse original image
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printf("Parsing boot image: [%s]\n\n", orig_image);
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parse_img(orig, size);
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printf("Repack to boot image: [%s]\n\n", out_image);
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// Create new image
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int fd = open_new(out_image);
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// Set all sizes to 0
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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.dt_size = 0;
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// Skip a page for header
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write_zero(fd, hdr.page_size);
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// Restore kernel
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if (mtk_kernel) {
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mtk_kernel_off = lseek(fd, 0, SEEK_CUR);
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restore_buf(fd, kernel, 512);
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memcpy(&mtk_kernel_hdr, kernel, sizeof(mtk_kernel_hdr));
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}
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hdr.kernel_size = restore(KERNEL_FILE, fd);
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file_align(fd, hdr.page_size, 1);
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// Restore ramdisk
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if (mtk_ramdisk) {
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mtk_ramdisk_off = lseek(fd, 0, SEEK_CUR);
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restore_buf(fd, ramdisk, 512);
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memcpy(&mtk_ramdisk_hdr, ramdisk, sizeof(mtk_ramdisk_hdr));
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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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// Before we start, clean up previous compressed files
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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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unlink(name);
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}
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size_t cpio_size;
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unsigned char *cpio;
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mmap_ro(RAMDISK_FILE, &cpio, &cpio_size);
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if (comp(ramdisk_type, RAMDISK_FILE, cpio, cpio_size))
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LOGE(1, "Unsupported ramdisk format!\n");
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munmap(cpio, cpio_size);
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}
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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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ramdisk_type = SUP_TYPE_LIST[i];
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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(1, "No ramdisk exists!\n");
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hdr.ramdisk_size = restore(name, fd);
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file_align(fd, hdr.page_size, 1);
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// Restore second
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if (access(SECOND_FILE, R_OK) == 0) {
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hdr.second_size = restore(SECOND_FILE, fd);
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file_align(fd, hdr.page_size, 1);
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}
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// Restore dtb
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if (access(DTB_FILE, R_OK) == 0) {
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hdr.dt_size = restore(DTB_FILE, fd);
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file_align(fd, hdr.page_size, 1);
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}
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// Check extra info, currently only for LG Bump and Samsung SEANDROIDENFORCE
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if (extra) {
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if (memcmp(extra, "SEANDROIDENFORCE", 16) == 0 ||
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memcmp(extra, "\x41\xa9\xe4\x67\x74\x4d\x1d\x1b\xa4\x29\xf2\xec\xea\x65\x52\x79", 16) == 0 ) {
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restore_buf(fd, extra, 16);
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}
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}
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// Write headers back
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if (mtk_kernel) {
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lseek(fd, mtk_kernel_off, SEEK_SET);
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mtk_kernel_hdr.size = hdr.kernel_size;
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hdr.kernel_size += 512;
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restore_buf(fd, &mtk_kernel_hdr, sizeof(mtk_kernel_hdr));
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}
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if (mtk_ramdisk) {
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lseek(fd, mtk_ramdisk_off, SEEK_SET);
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mtk_ramdisk_hdr.size = hdr.ramdisk_size;
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hdr.ramdisk_size += 512;
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restore_buf(fd, &mtk_ramdisk_hdr, sizeof(mtk_ramdisk_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, &hdr, sizeof(hdr));
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// Print new image info
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print_info();
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munmap(orig, size);
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close(fd);
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}
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