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Add vendor boot image support to magiskboot

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This commit is contained in:
topjohnwu 2020-10-25 06:09:36 -07:00
parent 1b0b180761
commit 0632b146b8
4 changed files with 74 additions and 19 deletions
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13
native/jni/magiskboot/bootimg.cpp
View File

@ -162,7 +162,8 @@ boot_img::boot_img(const char *image) {
mmap_ro(image, map_addr, map_size);
fprintf(stderr, "Parsing boot image: [%s]\n", image);
for (uint8_t *addr = map_addr; addr < map_addr + map_size; ++addr) {
switch (check_fmt(addr, map_size)) {
format_t fmt = check_fmt(addr, map_size);
switch (fmt) {
case CHROMEOS:
// chromeos require external signing
flags |= CHROMEOS_FLAG;
@ -179,7 +180,8 @@ boot_img::boot_img(const char *image) {
addr += sizeof(blob_hdr) - 1;
break;
case AOSP:
parse_image(addr);
case AOSP_VENDOR:
parse_image(addr, fmt);
return;
default:
break;
@ -242,9 +244,12 @@ off += hdr->name##_size(); \
off = do_align(off, hdr->page_size()); \
}
void boot_img::parse_image(uint8_t *addr) {
void boot_img::parse_image(uint8_t *addr, format_t type) {
auto hp = reinterpret_cast<boot_img_hdr*>(addr);
if (hp->page_size >= 0x02000000) {
if (type == AOSP_VENDOR) {
fprintf(stderr, "VENDOR_BOOT_HDR\n");
hdr = new dyn_img_vnd_v3(addr);
} else if (hp->page_size >= 0x02000000) {
fprintf(stderr, "PXA_BOOT_HDR\n");
hdr = new dyn_img_pxa(addr);
} else {

70
native/jni/magiskboot/bootimg.hpp
View File

@ -50,6 +50,7 @@ struct blob_hdr {
#define BOOT_ID_SIZE 32
#define BOOT_ARGS_SIZE 512
#define BOOT_EXTRA_ARGS_SIZE 1024
#define VENDOR_BOOT_ARGS_SIZE 2048
/*
* +-----------------+
@ -159,6 +160,21 @@ struct boot_img_hdr_pxa : public boot_img_hdr_common {
* n = (ramdisk_size + 4096 - 1) / 4096
*
* Note that in version 3 of the boot image header, page size is fixed at 4096 bytes.
*
* The structure of the vendor boot image (introduced with version 3 and
* required to be present when a v3 boot image is used) is as follows:
*
* +---------------------+
* | vendor boot header | o pages
* +---------------------+
* | vendor ramdisk | p pages
* +---------------------+
* | dtb | q pages
* +---------------------+
*
* o = (2112 + page_size - 1) / page_size
* p = (ramdisk_size + page_size - 1) / page_size
* q = (dtb_size + page_size - 1) / page_size
*/
struct boot_img_hdr_v3 {
@ -175,6 +191,23 @@ struct boot_img_hdr_v3 {
char cmdline[BOOT_ARGS_SIZE + BOOT_EXTRA_ARGS_SIZE];
} __attribute__((packed));
struct boot_img_hdr_vnd_v3 {
// Must be VENDOR_BOOT_MAGIC.
uint8_t magic[BOOT_MAGIC_SIZE];
// Version of the vendor boot image header.
uint32_t header_version;
uint32_t page_size; /* flash page size we assume */
uint32_t kernel_addr; /* physical load addr */
uint32_t ramdisk_addr; /* physical load addr */
uint32_t ramdisk_size; /* size in bytes */
char cmdline[VENDOR_BOOT_ARGS_SIZE];
uint32_t tags_addr; /* physical addr for kernel tags (if required) */
char name[BOOT_NAME_SIZE]; /* asciiz product name */
uint32_t header_size;
uint32_t dtb_size; /* size in bytes for DTB image */
uint64_t dtb_addr; /* physical load address for DTB image */
} __attribute__((packed));
/*******************************
* Polymorphic Universal Header
*******************************/
@ -222,6 +255,7 @@ protected:
boot_img_hdr_v2 *v2_hdr; /* AOSP v2 header */
boot_img_hdr_v3 *v3_hdr; /* AOSP v3 header */
boot_img_hdr_pxa *hdr_pxa; /* Samsung PXA header */
boot_img_hdr_vnd_v3 *vnd; /* AOSP vendor v3 header */
void *raw; /* Raw pointer */
};
@ -243,10 +277,11 @@ name(void *ptr) { \
} \
size_t hdr_size() override { return sizeof(hdr); }
#define impl_cls(ver) __impl_cls(dyn_img_##ver, boot_img_hdr_##ver)
#define __impl_val(name, hdr_name) \
decltype(std::declval<dyn_img_hdr>().name()) name() override { return hdr_name->name; }
#define impl_val(name) \
decltype(std::declval<dyn_img_hdr>().name()) name() override { return v2_hdr->name; }
#define impl_cls(ver) __impl_cls(dyn_img_##ver, boot_img_hdr_##ver)
#define impl_val(name) __impl_val(name, v2_hdr)
struct dyn_img_common : public dyn_img_hdr {
impl_val(kernel_size)
@ -284,8 +319,7 @@ struct dyn_img_v2 : public dyn_img_v1 {
};
#undef impl_val
#define impl_val(name) \
decltype(std::declval<dyn_img_hdr>().name()) name() override { return hdr_pxa->name; }
#define impl_val(name) __impl_val(name, hdr_pxa)
struct dyn_img_pxa : public dyn_img_common {
impl_cls(pxa)
@ -299,8 +333,7 @@ struct dyn_img_pxa : public dyn_img_common {
};
#undef impl_val
#define impl_val(name) \
decltype(std::declval<dyn_img_hdr>().name()) name() override { return v3_hdr->name; }
#define impl_val(name) __impl_val(name, v3_hdr)
struct dyn_img_v3 : public dyn_img_hdr {
impl_cls(v3)
@ -320,7 +353,26 @@ private:
uint32_t page_sz;
};
#undef impl_val
#define impl_val(name) __impl_val(name, vnd)
struct dyn_img_vnd_v3 : public dyn_img_hdr {
impl_cls(vnd_v3)
impl_val(header_version)
impl_val(page_size)
impl_val(ramdisk_size)
impl_val(cmdline)
impl_val(name)
impl_val(header_size)
impl_val(dtb_size)
// Make API compatible
char *extra_cmdline() override { return &vnd->cmdline[BOOT_ARGS_SIZE]; }
};
#undef __impl_cls
#undef __impl_val
#undef impl_cls
#undef impl_val
@ -363,7 +415,7 @@ struct boot_img {
mtk_hdr *k_hdr;
mtk_hdr *r_hdr;
// Pointer to dtb that is appended after kernel
// Pointer to dtb that is embedded in kernel
uint8_t *kernel_dtb;
uint32_t kernel_dt_size = 0;
@ -383,5 +435,5 @@ struct boot_img {
boot_img(const char *);
~boot_img();
void parse_image(uint8_t *addr);
void parse_image(uint8_t *addr, format_t type);
};

8
native/jni/magiskboot/format.cpp
View File

@ -28,6 +28,8 @@ format_t check_fmt(const void *buf, size_t len) {
return CHROMEOS;
} else if (MATCH(BOOT_MAGIC)) {
return AOSP;
} else if (MATCH(VENDOR_BOOT_MAGIC)) {
return AOSP_VENDOR;
} else if (MATCH(GZIP1_MAGIC) || MATCH(GZIP2_MAGIC)) {
return GZIP;
} else if (MATCH(LZOP_MAGIC)) {
@ -58,10 +60,6 @@ format_t check_fmt(const void *buf, size_t len) {
const char *Fmt2Name::operator[](format_t fmt) {
switch (fmt) {
case CHROMEOS:
return "chromeos";
case AOSP:
return "aosp";
case GZIP:
return "gzip";
case LZOP:
@ -78,8 +76,6 @@ const char *Fmt2Name::operator[](format_t fmt) {
return "lz4_legacy";
case LZ4_LG:
return "lz4_lg";
case MTK:
return "mtk";
case DTB:
return "dtb";
default:

2
native/jni/magiskboot/format.hpp
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@ -8,6 +8,7 @@ typedef enum {
/* Boot formats */
CHROMEOS,
AOSP,
AOSP_VENDOR,
DHTB,
BLOB,
/* Compression formats */
@ -29,6 +30,7 @@ typedef enum {
#define COMPRESSED_ANY(fmt) ((fmt) >= GZIP && (fmt) <= LZOP)
#define BOOT_MAGIC "ANDROID!"
#define VENDOR_BOOT_MAGIC "VNDRBOOT"
#define CHROMEOS_MAGIC "CHROMEOS"
#define GZIP1_MAGIC "\x1f\x8b"
#define GZIP2_MAGIC "\x1f\x9e"