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Support patching header in magiskboot

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This commit is contained in:
topjohnwu 2019-03-07 21:32:01 -05:00
parent d2cb638fcd
commit 1287372f5a
3 changed files with 73 additions and 5 deletions
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60
native/jni/magiskboot/bootimg.cpp
View File

@ -269,11 +269,35 @@ void boot_img::print_hdr() {
fprintf(stderr, "]\n");
}
int unpack(const char *image) {
int unpack(const char *image, bool hdr) {
boot_img boot {};
int ret = boot.parse_file(image);
int fd;
if (hdr) {
FILE *fp = xfopen(HEADER_FILE, "w");
fprintf(fp, "pagesize=%u\n", boot.hdr.page_size());
fprintf(fp, "name=%s\n", boot.hdr.name());
fprintf(fp, "cmdline=%.512s%.1024s\n", boot.hdr.cmdline(), boot.hdr.extra_cmdline());
uint32_t ver = boot.hdr.os_version();
if (ver) {
int a, b, c, y, m = 0;
int version, patch_level;
version = ver >> 11;
patch_level = ver & 0x7ff;
a = (version >> 14) & 0x7f;
b = (version >> 7) & 0x7f;
c = version & 0x7f;
fprintf(fp, "os_version=%d.%d.%d\n", a, b, c);
y = (patch_level >> 4) + 2000;
m = patch_level & 0xf;
fprintf(fp, "patch_level=%d-%02d\n", y, m);
}
fclose(fp);
}
// Dump kernel
if (COMPRESSED(boot.k_fmt)) {
fd = creat(KERNEL_FILE, 0644);
@ -338,6 +362,40 @@ void repack(const char* orig_image, const char* out_image) {
restore_buf(fd, boot.map_addr, ACCLAIM_PRE_HEADER_SZ);
}
// header
if (access(HEADER_FILE, R_OK) == 0) {
int os_version = 0;
parse_prop_file(HEADER_FILE, [&](string_view key, string_view value) -> bool {
if (key == "page_size") {
boot.hdr.page_size() = parse_int(value);
} else if (key == "name") {
memset(boot.hdr.name(), 0, 16);
memcpy(boot.hdr.name(), value.data(), value.length() + 1);
} else if (key == "cmdline") {
memset(boot.hdr.cmdline(), 0, 512);
memset(boot.hdr.extra_cmdline(), 0, 1024);
if (value.length() > 512) {
memcpy(boot.hdr.cmdline(), value.data(), 512);
memcpy(boot.hdr.extra_cmdline(), &value[512], value.length() - 511);
} else {
memcpy(boot.hdr.cmdline(), value.data(), value.length() + 1);
}
} else if (key == "os_version") {
int a, b, c;
sscanf(value.data(), "%d.%d.%d", &a, &b, &c);
os_version |= ((a << 14) | (b << 7) | c) << 11;
} else if (key == "patch_level") {
int y, m;
sscanf(value.data(), "%d-%d", &y, &m);
y -= 2000;
os_version |= (y << 4) | m;
}
return true;
});
if (os_version)
boot.hdr.os_version() = os_version;
}
// Skip a page for header
header_off = lseek(fd, 0, SEEK_CUR);
write_zero(fd, boot.hdr.page_size());

3
native/jni/magiskboot/magiskboot.h
View File

@ -2,6 +2,7 @@
#include <sys/types.h>
#define HEADER_FILE "header"
#define KERNEL_FILE "kernel"
#define RAMDISK_FILE "ramdisk.cpio"
#define SECOND_FILE "second"
@ -11,7 +12,7 @@
#define NEW_BOOT "new-boot.img"
// Main entries
int unpack(const char *image);
int unpack(const char *image, bool hdr = false);
void repack(const char* orig_image, const char* out_image);
void hexpatch(const char *image, const char *from, const char *to);
int cpio_commands(int argc, char *argv[]);

15
native/jni/magiskboot/main.cpp
View File

@ -18,9 +18,11 @@ static void usage(char *arg0) {
"Usage: %s <action> [args...]\n"
"\n"
"Supported actions:\n"
" unpack <bootimg>\n"
" Unpack <bootimg> to, if available, kernel, ramdisk.cpio, \n"
" unpack [-h] <bootimg>\n"
" Unpack <bootimg> to, if available, kernel, ramdisk.cpio,\n"
" second, dtb, extra, and recovery_dtbo into current directory.\n"
" If '-h' is provided, it will dump header info to 'header',\n"
" which will be parsed when repacking.\n"
" Return values:\n"
" 0:valid 1:error 2:chromeos 3:ELF32 4:ELF64\n"
"\n"
@ -116,6 +118,7 @@ int main(int argc, char *argv[]) {
if (strcmp(argv[1], "cleanup") == 0) {
fprintf(stderr, "Cleaning up...\n");
unlink(HEADER_FILE);
unlink(KERNEL_FILE);
unlink(RAMDISK_FILE);
unlink(SECOND_FILE);
@ -133,7 +136,13 @@ int main(int argc, char *argv[]) {
printf("\n");
munmap(buf, size);
} else if (argc > 2 && strcmp(argv[1], "unpack") == 0) {
return unpack(argv[2]);
if (strcmp(argv[2], "-h") == 0) {
if (argc == 3)
usage(argv[0]);
return unpack(argv[3], true);
} else {
return unpack(argv[2]);
}
} else if (argc > 2 && strcmp(argv[1], "repack") == 0) {
repack(argv[2], argv[3] ? argv[3] : NEW_BOOT);
} else if (argc > 2 && strcmp(argv[1], "decompress") == 0) {