MarcoBuster/Magisk
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Add DHTB header support

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This commit is contained in:
topjohnwu 2018-01-29 22:16:02 +08:00
parent a58d3ea04d
commit 7cfc24d68f
7 changed files with 150 additions and 88 deletions
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5
native/jni/include/utils.h
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@ -93,6 +93,9 @@ void wait_till_exists(const char *target);
// file.c
#define align(p, a) (((p) + (a) - 1) / (a) * (a))
#define align_off(p, a) (align(p, a) - (p))
extern char **excl_list;
struct file_attr {
@ -125,8 +128,6 @@ void full_read(const char *filename, void **buf, size_t *size);
void full_read_at(int dirfd, const char *filename, void **buf, size_t *size);
void stream_full_read(int fd, void **buf, size_t *size);
void write_zero(int fd, size_t size);
void mem_align(size_t *pos, size_t align);
void file_align(int fd, size_t align, int out);
// img.c

133
native/jni/magiskboot/bootimg.c
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@ -7,6 +7,8 @@
#include "magiskboot.h"
#include "utils.h"
#include "logging.h"
#include "mincrypt/sha.h"
#include "mincrypt/sha256.h"
#define INSUF_BLOCK_RET 2
#define CHROMEOS_RET 3
@ -68,6 +70,10 @@ static void print_hdr(const boot_img *boot) {
fprintf(stderr, "NAME [%s]\n", header(boot, name));
fprintf(stderr, "CMDLINE [%s]\n", header(boot, cmdline));
fprintf(stderr, "CHECKSUM [");
for (int i = 0; i < ((boot->flags & SHA256_FLAG) ? SHA256_DIGEST_SIZE : SHA_DIGEST_SIZE); ++i)
fprintf(stderr, "%02x", header(boot, id)[i]);
fprintf(stderr, "]\n");
}
static void clean_boot(boot_img *boot) {
@ -78,6 +84,7 @@ static void clean_boot(boot_img *boot) {
memset(boot, 0, sizeof(*boot));
}
#define pos_align() pos = align(pos, header(boot, page_size))
int parse_img(const char *image, boot_img *boot) {
memset(boot, 0, sizeof(*boot));
int is_blk = mmap_ro(image, &boot->map_addr, &boot->map_size);
@ -92,6 +99,11 @@ int parse_img(const char *image, boot_img *boot) {
// The caller should know it's chromeos, as it needs additional signing
boot->flags |= CHROMEOS_FLAG;
continue;
case DHTB:
boot->flags |= DHTB_FLAG;
boot->flags |= SEANDROID_FLAG;
fprintf(stderr, "DHTB_HDR\n");
continue;
case ELF32:
exit(ELF32_RET);
case ELF64:
@ -109,26 +121,33 @@ int parse_img(const char *image, boot_img *boot) {
}
pos += header(boot, page_size);
for (int i = SHA_DIGEST_SIZE; i < SHA256_DIGEST_SIZE; ++i) {
if (header(boot, id)[i]) {
boot->flags |= SHA256_FLAG;
break;
}
}
print_hdr(boot);
boot->kernel = head + pos;
pos += header(boot, kernel_size);
mem_align(&pos, header(boot, page_size));
pos_align();
boot->ramdisk = head + pos;
pos += header(boot, ramdisk_size);
mem_align(&pos, header(boot, page_size));
pos_align();
if (header(boot, second_size)) {
boot->second = head + pos;
pos += header(boot, second_size);
mem_align(&pos, header(boot, page_size));
pos_align();
}
if (header(boot, extra_size)) {
boot->extra = head + pos;
pos += header(boot, extra_size);
mem_align(&pos, header(boot, page_size));
pos_align();
}
if (pos < boot->map_size) {
@ -136,6 +155,13 @@ int parse_img(const char *image, boot_img *boot) {
boot->tail_size = boot->map_size - pos;
}
// Check tail info, currently only for LG Bump and Samsung SEANDROIDENFORCE
if (boot->tail_size >= 16 && memcmp(boot->tail, SEANDROID_MAGIC, 16) == 0) {
boot->flags |= SEANDROID_FLAG;
} else if (boot->tail_size >= 16 && memcmp(boot->tail, LG_BUMP_MAGIC, 16) == 0) {
boot->flags |= LG_BUMP_FLAG;
}
// Search for dtb in kernel
for (uint32_t i = 0; i < header(boot, kernel_size); ++i) {
if (memcmp(boot->kernel + i, DTB_MAGIC, 4) == 0) {
@ -232,11 +258,11 @@ int unpack(const char *image) {
return ret;
}
#define file_align() write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR) - header_off, header(&boot, page_size)))
void repack(const char* orig_image, const char* out_image) {
boot_img boot;
// There are possible two MTK headers
off_t mtk_kernel_off, mtk_ramdisk_off;
off_t header_off, kernel_off, ramdisk_off, second_off, extra_off;
// Parse original image
parse_img(orig_image, &boot);
@ -246,12 +272,19 @@ void repack(const char* orig_image, const char* out_image) {
// Create new image
int fd = creat(out_image, 0644);
if (boot.flags & DHTB_FLAG) {
// Skip DHTB header
write_zero(fd, 512);
}
// Skip a page for header
header_off = lseek(fd, 0, SEEK_CUR);
write_zero(fd, header(&boot, page_size));
// kernel
kernel_off = lseek(fd, 0, SEEK_CUR);
if (boot.flags & MTK_KERNEL) {
// Record position and skip MTK header
mtk_kernel_off = lseek(fd, 0, SEEK_CUR);
// Skip MTK header
write_zero(fd, 512);
}
if (COMPRESSED(boot.k_fmt)) {
@ -263,15 +296,16 @@ void repack(const char* orig_image, const char* out_image) {
} else {
lheader(&boot, kernel_size, = restore(KERNEL_FILE, fd));
}
// Restore dtb
// dtb
if (boot.dt_size && access(DTB_FILE, R_OK) == 0) {
lheader(&boot, kernel_size, += restore(DTB_FILE, fd));
}
file_align(fd, header(&boot, page_size), 1);
file_align();
// ramdisk
ramdisk_off = lseek(fd, 0, SEEK_CUR);
if (boot.flags & MTK_RAMDISK) {
// Record position and skip MTK header
mtk_ramdisk_off = lseek(fd, 0, SEEK_CUR);
// Skip MTK header
write_zero(fd, 512);
}
if (access(RAMDISK_FILE, R_OK) == 0) {
@ -296,48 +330,83 @@ void repack(const char* orig_image, const char* out_image) {
LOGE("No ramdisk exists!\n");
lheader(&boot, ramdisk_size, = restore(name, fd));
}
file_align(fd, header(&boot, page_size), 1);
file_align();
// Restore second
// second
second_off = lseek(fd, 0, SEEK_CUR);
if (header(&boot, second_size) && access(SECOND_FILE, R_OK) == 0) {
lheader(&boot, second_size, = restore(SECOND_FILE, fd));
file_align(fd, header(&boot, page_size), 1);
file_align();
}
// Restore extra
// extra
extra_off = lseek(fd, 0, SEEK_CUR);
if (header(&boot, extra_size) && access(EXTRA_FILE, R_OK) == 0) {
lheader(&boot, extra_size, = restore(EXTRA_FILE, fd));
file_align(fd, header(&boot, page_size), 1);
file_align();
}
// Check tail info, currently only for LG Bump and Samsung SEANDROIDENFORCE
if (boot.tail_size >= 16) {
if (memcmp(boot.tail, "SEANDROIDENFORCE", 16) == 0 ||
memcmp(boot.tail, LG_BUMP_MAGIC, 16) == 0 ) {
restore_buf(fd, boot.tail, 16);
// 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);
}
// Write MTK headers back
close(fd);
// Map output image as rw
munmap(boot.map_addr, boot.map_size);
mmap_rw(out_image, &boot.map_addr, &boot.map_size);
// MTK headers
if (boot.flags & MTK_KERNEL) {
lseek(fd, mtk_kernel_off, SEEK_SET);
boot.k_hdr->size = header(&boot, kernel_size);
lheader(&boot, kernel_size, += 512);
restore_buf(fd, boot.k_hdr, sizeof(mtk_hdr));
memcpy(boot.map_addr + kernel_off, boot.k_hdr, sizeof(mtk_hdr));
}
if (boot.flags & MTK_RAMDISK) {
lseek(fd, mtk_ramdisk_off, SEEK_SET);
boot.r_hdr->size = header(&boot, ramdisk_size);
lheader(&boot, ramdisk_size, += 512);
restore_buf(fd, boot.r_hdr, sizeof(mtk_hdr));
memcpy(boot.map_addr + ramdisk_off, boot.r_hdr, sizeof(mtk_hdr));
}
// Main header
lseek(fd, 0, SEEK_SET);
restore_buf(fd, boot.hdr, (boot.flags & PXA_FLAG) ? sizeof(pxa_boot_img_hdr) : sizeof(boot_img_hdr));
// Update checksum
HASH_CTX ctx;
(boot.flags & SHA256_FLAG) ? SHA256_init(&ctx) : SHA_init(&ctx);
uint32_t size = header(&boot, kernel_size);
HASH_update(&ctx, boot.map_addr + kernel_off, size);
HASH_update(&ctx, &size, sizeof(size));
size = header(&boot, ramdisk_size);
HASH_update(&ctx, boot.map_addr + ramdisk_off, size);
HASH_update(&ctx, &size, sizeof(size));
size = header(&boot, second_size);
HASH_update(&ctx, boot.map_addr + second_off, size);
HASH_update(&ctx, &size, sizeof(size));
size = header(&boot, extra_size);
if (size) {
HASH_update(&ctx, boot.map_addr + extra_off, size);
HASH_update(&ctx, &size, sizeof(size));
}
memset(header(&boot, id), 0, 32);
memcpy(header(&boot, id), HASH_final(&ctx),
(boot.flags & SHA256_FLAG) ? SHA256_DIGEST_SIZE : SHA_DIGEST_SIZE);
// Print new image info
print_hdr(&boot);
clean_boot(&boot);
close(fd);
// Main header
memcpy(boot.map_addr + header_off, boot.hdr,
(boot.flags & PXA_FLAG) ? sizeof(pxa_boot_img_hdr) : sizeof(boot_img_hdr));
// DHTB header
if (boot.flags & DHTB_FLAG) {
dhtb_hdr *hdr = boot.map_addr;
memcpy(hdr, DHTB_MAGIC, 8);
hdr->size = boot.map_size - 512;
SHA256_hash(boot.map_addr + 512, hdr->size, hdr->checksum);
}
clean_boot(&boot);
}

18
native/jni/magiskboot/bootimg.h
View File

@ -28,10 +28,8 @@ typedef struct boot_img_hdr {
uint32_t os_version;
char name[16]; /* asciiz product name */
char cmdline[512];
uint32_t id[8]; /* timestamp / checksum / sha1 / etc */
char id[32]; /* timestamp / checksum / sha1 / etc */
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
@ -56,10 +54,8 @@ typedef struct pxa_boot_img_hdr {
uint32_t page_size; /* flash page size we assume */
char name[24]; /* asciiz product name */
char cmdline[512];
uint32_t id[8]; /* timestamp / checksum / sha1 / etc */
char id[32]; /* timestamp / checksum / sha1 / etc */
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
@ -102,11 +98,21 @@ typedef struct mtk_hdr {
char name[32]; /* The type of the header */
} __attribute__((packed)) mtk_hdr;
typedef struct dhtb_hdr {
char magic[8]; /* DHTB magic */
char checksum[40]; /* Payload SHA256, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
uint32_t size; /* Payload size, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
} __attribute__((packed)) dhtb_hdr;
// Flags
#define MTK_KERNEL 0x01
#define MTK_RAMDISK 0x02
#define CHROMEOS_FLAG 0x04
#define PXA_FLAG 0x08
#define DHTB_FLAG 0x10
#define SEANDROID_FLAG 0x20
#define LG_BUMP_FLAG 0x40
#define SHA256_FLAG 0x80
typedef struct boot_img {
// Memory map of the whole image

2
native/jni/magiskboot/format.c
View File

@ -31,6 +31,8 @@ format_t check_fmt(const void *buf) {
return MTK;
} else if (memcmp(buf, DTB_MAGIC, 4) == 0) {
return DTB;
} else if (memcmp(buf, DHTB_MAGIC, 8) == 0) {
return DHTB;
} else {
return UNKNOWN;
}

5
native/jni/magiskboot/format.h
View File

@ -15,7 +15,8 @@ typedef enum {
LZ4,
LZ4_LEGACY,
MTK,
DTB
DTB,
DHTB
} format_t;
#define COMPRESSED(fmt) (fmt >= GZIP && fmt <= LZ4_LEGACY)
@ -33,6 +34,8 @@ typedef enum {
#define MTK_MAGIC "\x88\x16\x88\x58"
#define DTB_MAGIC "\xd0\x0d\xfe\xed"
#define LG_BUMP_MAGIC "\x41\xa9\xe4\x67\x74\x4d\x1d\x1b\xa4\x29\xf2\xec\xea\x65\x52\x79"
#define DHTB_MAGIC "\x44\x48\x54\x42\x01\x00\x00\x00"
#define SEANDROID_MAGIC "SEANDROIDENFORCE"
#define SUP_LIST ((char *[]) { "gzip", "xz", "lzma", "bzip2", "lz4", "lz4_legacy", NULL })
#define SUP_EXT_LIST ((char *[]) { "gz", "xz", "lzma", "bz2", "lz4", "lz4", NULL })

12
native/jni/utils/cpio.c
View File

@ -56,6 +56,7 @@ void cpio_vec_insert(struct vector *v, cpio_entry *n) {
}
// Parse cpio file to a vector of cpio_entry
#define parse_align() lseek(fd, align(lseek(fd, 0, SEEK_CUR), 4), SEEK_SET)
void parse_cpio(struct vector *v, const char *filename) {
int fd = open(filename, O_RDONLY);
if (fd < 0) return;
@ -79,7 +80,7 @@ void parse_cpio(struct vector *v, const char *filename) {
// f->check = x8u(header.check);
f->filename = xmalloc(namesize);
xxread(fd, f->filename, namesize);
file_align(fd, 4, 0);
parse_align();
if (strcmp(f->filename, ".") == 0 || strcmp(f->filename, "..") == 0) {
cpio_free(f);
continue;
@ -91,13 +92,14 @@ void parse_cpio(struct vector *v, const char *filename) {
if (f->filesize) {
f->data = xmalloc(f->filesize);
xxread(fd, f->data, f->filesize);
file_align(fd, 4, 0);
parse_align();
}
vec_push_back(v, f);
}
close(fd);
}
#define dump_align() write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR), 4))
void dump_cpio(struct vector *v, const char *filename) {
fprintf(stderr, "Dump cpio: [%s]\n", filename);
unsigned inode = 300000;
@ -124,17 +126,17 @@ void dump_cpio(struct vector *v, const char *filename) {
);
xwrite(fd, header, 110);
xwrite(fd, e->filename, strlen(e->filename) + 1);
file_align(fd, 4, 1);
dump_align();
if (e->filesize) {
xwrite(fd, e->data, e->filesize);
file_align(fd, 4, 1);
dump_align();
}
}
// Write trailer
sprintf(header, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x", inode++, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 11, 0);
xwrite(fd, header, 110);
xwrite(fd, "TRAILER!!!\0", 11);
file_align(fd, 4, 1);
dump_align();
close(fd);
}

21
native/jni/utils/file.c
View File

@ -424,24 +424,3 @@ void write_zero(int fd, size_t size) {
ftruncate(fd, pos + size);
lseek(fd, pos + size, SEEK_SET);
}
void mem_align(size_t *pos, size_t align) {
size_t mask = align - 1;
if (*pos & mask) {
*pos += align - (*pos & mask);
}
}
void file_align(int fd, size_t align, int out) {
size_t pos = lseek(fd, 0, SEEK_CUR);
size_t mask = align - 1;
size_t off;
if (pos & mask) {
off = align - (pos & mask);
if (out) {
write_zero(fd, off);
} else {
lseek(fd, pos + off, SEEK_SET);
}
}
}