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Add DHTB header support

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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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135
native/jni/magiskboot/bootimg.c
View File

@@ -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);
// 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);
close(fd);
}

32
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 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
@@ -114,9 +120,9 @@ typedef struct boot_img {
size_t map_size;
// Headers
void *hdr; /* Either boot_img_hdr or pxa_boot_img_hdr */
mtk_hdr *k_hdr; /* MTK kernel header */
mtk_hdr *r_hdr; /* MTK ramdisk header */
void *hdr; /* Either boot_img_hdr or pxa_boot_img_hdr */
mtk_hdr *k_hdr; /* MTK kernel header */
mtk_hdr *r_hdr; /* MTK ramdisk header */
// Flags to indicate the state of current boot image
uint8_t flags;

2
native/jni/magiskboot/format.c
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@@ -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;
}

31
native/jni/magiskboot/format.h
View File

@@ -2,20 +2,21 @@
#define _FORMAT_H_
typedef enum {
UNKNOWN,
CHROMEOS,
AOSP,
ELF32,
ELF64,
GZIP,
LZOP,
XZ,
LZMA,
BZIP2,
LZ4,
LZ4_LEGACY,
MTK,
DTB
UNKNOWN,
CHROMEOS,
AOSP,
ELF32,
ELF64,
GZIP,
LZOP,
XZ,
LZMA,
BZIP2,
LZ4,
LZ4_LEGACY,
MTK,
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 })