forked from MarcoBuster/Magisk
02dc1172be
Since we no longer need to add new properties in the device tree, and all the patches we do removes strings, we can just directly patch the flat device tree in-place, ignoring basically all the higher level DTB structure and format to accomplish 100% compatibility.
350 lines
8.6 KiB
C++
350 lines
8.6 KiB
C++
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <utils.hpp>
|
|
#include <cpio.hpp>
|
|
|
|
#include "magiskboot.hpp"
|
|
#include "compress.hpp"
|
|
|
|
using namespace std;
|
|
|
|
constexpr char RAMDISK_XZ[] = "ramdisk.cpio.xz";
|
|
|
|
static const char *UNSUPPORT_LIST[] =
|
|
{ "sbin/launch_daemonsu.sh", "sbin/su", "init.xposed.rc",
|
|
"boot/sbin/launch_daemonsu.sh" };
|
|
|
|
static const char *MAGISK_LIST[] =
|
|
{ ".backup/.magisk", "init.magisk.rc",
|
|
"overlay/init.magisk.rc" };
|
|
|
|
class magisk_cpio : public cpio_rw {
|
|
public:
|
|
magisk_cpio() = default;
|
|
explicit magisk_cpio(const char *filename) : cpio_rw(filename) {}
|
|
void patch();
|
|
int test();
|
|
char *sha1();
|
|
void restore();
|
|
void backup(const char *orig);
|
|
void compress();
|
|
void decompress();
|
|
};
|
|
|
|
bool check_env(const char *name) {
|
|
const char *val = getenv(name);
|
|
return val ? strcmp(val, "true") == 0 : false;
|
|
}
|
|
|
|
void magisk_cpio::patch() {
|
|
bool keepverity = check_env("KEEPVERITY");
|
|
bool keepforceencrypt = check_env("KEEPFORCEENCRYPT");
|
|
fprintf(stderr, "Patch with flag KEEPVERITY=[%s] KEEPFORCEENCRYPT=[%s]\n",
|
|
keepverity ? "true" : "false", keepforceencrypt ? "true" : "false");
|
|
|
|
for (auto it = entries.begin(); it != entries.end();) {
|
|
auto cur = it++;
|
|
bool fstab = (!keepverity || !keepforceencrypt) &&
|
|
S_ISREG(cur->second->mode) &&
|
|
!str_starts(cur->first, ".backup") &&
|
|
!str_contains(cur->first, "twrp") &&
|
|
!str_contains(cur->first, "recovery") &&
|
|
str_contains(cur->first, "fstab");
|
|
if (!keepverity) {
|
|
if (fstab) {
|
|
fprintf(stderr, "Found fstab file [%s]\n", cur->first.data());
|
|
cur->second->filesize = patch_verity(cur->second->data, cur->second->filesize);
|
|
} else if (cur->first == "verity_key") {
|
|
rm(cur);
|
|
continue;
|
|
}
|
|
}
|
|
if (!keepforceencrypt) {
|
|
if (fstab) {
|
|
cur->second->filesize = patch_encryption(cur->second->data, cur->second->filesize);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#define STOCK_BOOT 0
|
|
#define MAGISK_PATCHED (1 << 0)
|
|
#define UNSUPPORTED_CPIO (1 << 1)
|
|
#define COMPRESSED_CPIO (1 << 2)
|
|
#define TWO_STAGE_INIT (1 << 3)
|
|
|
|
int magisk_cpio::test() {
|
|
for (auto file : UNSUPPORT_LIST)
|
|
if (exists(file))
|
|
return UNSUPPORTED_CPIO;
|
|
|
|
int flags = STOCK_BOOT;
|
|
|
|
if (exists(RAMDISK_XZ)) {
|
|
flags |= COMPRESSED_CPIO | MAGISK_PATCHED;
|
|
decompress();
|
|
}
|
|
|
|
if (exists("apex") || exists("first_stage_ramdisk"))
|
|
flags |= TWO_STAGE_INIT;
|
|
|
|
for (auto file : MAGISK_LIST) {
|
|
if (exists(file)) {
|
|
flags |= MAGISK_PATCHED;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
#define for_each_line(line, buf, size) \
|
|
for (line = (char *) buf; line < (char *) buf + size && line[0]; line = strchr(line + 1, '\n') + 1)
|
|
|
|
char *magisk_cpio::sha1() {
|
|
decompress();
|
|
char sha1[41];
|
|
char *line;
|
|
for (auto &e : entries) {
|
|
if (e.first == "init.magisk.rc" || e.first == "overlay/init.magisk.rc") {
|
|
for_each_line(line, e.second->data, e.second->filesize) {
|
|
if (strncmp(line, "#STOCKSHA1=", 11) == 0) {
|
|
strncpy(sha1, line + 12, 40);
|
|
sha1[40] = '\0';
|
|
return strdup(sha1);
|
|
}
|
|
}
|
|
} else if (e.first == ".backup/.magisk") {
|
|
for_each_line(line, e.second->data, e.second->filesize) {
|
|
if (strncmp(line, "SHA1=", 5) == 0) {
|
|
strncpy(sha1, line + 5, 40);
|
|
sha1[40] = '\0';
|
|
return strdup(sha1);
|
|
}
|
|
}
|
|
} else if (e.first == ".backup/.sha1") {
|
|
return (char *) e.second->data;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
#define for_each_str(str, buf, size) \
|
|
for (str = (char *) buf; str < (char *) buf + size; str = str += strlen(str) + 1)
|
|
|
|
void magisk_cpio::restore() {
|
|
decompress();
|
|
|
|
if (auto it = entries.find(".backup/.rmlist"); it != entries.end()) {
|
|
char *file;
|
|
for_each_str(file, it->second->data, it->second->filesize)
|
|
rm(file, false);
|
|
rm(it);
|
|
}
|
|
|
|
for (auto it = entries.begin(); it != entries.end();) {
|
|
auto cur = it++;
|
|
if (str_starts(cur->first, ".backup")) {
|
|
if (cur->first.length() == 7 || cur->first.substr(8) == ".magisk") {
|
|
rm(cur);
|
|
} else {
|
|
mv(cur, &cur->first[8]);
|
|
}
|
|
} else if (str_starts(cur->first, "magisk") ||
|
|
cur->first == "overlay/init.magisk.rc" ||
|
|
cur->first == "sbin/magic_mask.sh" ||
|
|
cur->first == "init.magisk.rc") {
|
|
// Some known stuff we can remove
|
|
rm(cur);
|
|
}
|
|
}
|
|
}
|
|
|
|
void magisk_cpio::backup(const char *orig) {
|
|
if (access(orig, R_OK))
|
|
return;
|
|
entry_map bkup_entries;
|
|
string remv;
|
|
|
|
auto b = new cpio_entry(".backup", S_IFDIR);
|
|
bkup_entries[b->filename].reset(b);
|
|
|
|
magisk_cpio o(orig);
|
|
|
|
// Remove possible backups in original ramdisk
|
|
o.rm(".backup", true);
|
|
rm(".backup", true);
|
|
|
|
auto lhs = o.entries.begin();
|
|
auto rhs = entries.begin();
|
|
|
|
while (lhs != o.entries.end() || rhs != entries.end()) {
|
|
int res;
|
|
bool backup = false;
|
|
if (lhs != o.entries.end() && rhs != entries.end()) {
|
|
res = lhs->first.compare(rhs->first);
|
|
} else if (lhs == o.entries.end()) {
|
|
res = 1;
|
|
} else {
|
|
res = -1;
|
|
}
|
|
|
|
if (res < 0) {
|
|
// Something is missing in new ramdisk, backup!
|
|
backup = true;
|
|
fprintf(stderr, "Backup missing entry: ");
|
|
} else if (res == 0) {
|
|
if (lhs->second->filesize != rhs->second->filesize ||
|
|
memcmp(lhs->second->data, rhs->second->data, lhs->second->filesize) != 0) {
|
|
// Not the same!
|
|
backup = true;
|
|
fprintf(stderr, "Backup mismatch entry: ");
|
|
}
|
|
} else {
|
|
// Something new in ramdisk
|
|
remv += rhs->first;
|
|
remv += (char) '\0';
|
|
fprintf(stderr, "Record new entry: [%s] -> [.backup/.rmlist]\n", rhs->first.data());
|
|
}
|
|
if (backup) {
|
|
string back_name(".backup/");
|
|
back_name += lhs->first;
|
|
fprintf(stderr, "[%s] -> [%s]\n", lhs->first.data(), back_name.data());
|
|
auto ex = static_cast<cpio_entry*>(lhs->second.release());
|
|
ex->filename = back_name;
|
|
bkup_entries[ex->filename].reset(ex);
|
|
}
|
|
|
|
// Increment positions
|
|
if (res < 0) {
|
|
++lhs;
|
|
} else if (res == 0) {
|
|
++lhs; ++rhs;
|
|
} else {
|
|
++rhs;
|
|
}
|
|
}
|
|
|
|
if (!remv.empty()) {
|
|
auto rmlist = new cpio_entry(".backup/.rmlist", S_IFREG);
|
|
rmlist->filesize = remv.length();
|
|
rmlist->data = xmalloc(remv.length());
|
|
memcpy(rmlist->data, remv.data(), remv.length());
|
|
bkup_entries[rmlist->filename].reset(rmlist);
|
|
}
|
|
|
|
if (bkup_entries.size() > 1)
|
|
entries.merge(bkup_entries);
|
|
}
|
|
|
|
void magisk_cpio::compress() {
|
|
if (exists(RAMDISK_XZ))
|
|
return;
|
|
fprintf(stderr, "Compressing cpio -> [%s]\n", RAMDISK_XZ);
|
|
auto init = entries.extract("init");
|
|
|
|
uint8_t *data;
|
|
size_t len;
|
|
auto strm = make_stream_fp(get_encoder(XZ, make_unique<byte_stream>(data, len)));
|
|
dump(strm.release());
|
|
|
|
entries.clear();
|
|
entries.insert(std::move(init));
|
|
auto xz = new cpio_entry(RAMDISK_XZ, S_IFREG);
|
|
xz->data = data;
|
|
xz->filesize = len;
|
|
insert(xz);
|
|
}
|
|
|
|
void magisk_cpio::decompress() {
|
|
auto it = entries.find(RAMDISK_XZ);
|
|
if (it == entries.end())
|
|
return;
|
|
fprintf(stderr, "Decompressing cpio [%s]\n", RAMDISK_XZ);
|
|
|
|
char *data;
|
|
size_t len;
|
|
{
|
|
auto strm = get_decoder(XZ, make_unique<byte_stream>(data, len));
|
|
strm->write(it->second->data, it->second->filesize);
|
|
}
|
|
|
|
entries.erase(it);
|
|
load_cpio(data, len);
|
|
free(data);
|
|
}
|
|
|
|
int cpio_commands(int argc, char *argv[]) {
|
|
char *incpio = argv[0];
|
|
++argv;
|
|
--argc;
|
|
|
|
magisk_cpio cpio;
|
|
if (access(incpio, R_OK) == 0)
|
|
cpio.load_cpio(incpio);
|
|
|
|
int cmdc;
|
|
char *cmdv[6];
|
|
|
|
while (argc) {
|
|
// Clean up
|
|
cmdc = 0;
|
|
memset(cmdv, NULL, sizeof(cmdv));
|
|
|
|
// Split the commands
|
|
for (char *tok = strtok(argv[0], " "); tok; tok = strtok(nullptr, " "))
|
|
cmdv[cmdc++] = tok;
|
|
|
|
if (cmdc == 0)
|
|
continue;
|
|
|
|
if (strcmp(cmdv[0], "test") == 0) {
|
|
exit(cpio.test());
|
|
} else if (strcmp(cmdv[0], "restore") == 0) {
|
|
cpio.restore();
|
|
} else if (strcmp(cmdv[0], "sha1") == 0) {
|
|
char *sha1 = cpio.sha1();
|
|
if (sha1) printf("%s\n", sha1);
|
|
return 0;
|
|
} else if (strcmp(cmdv[0], "compress") == 0){
|
|
cpio.compress();
|
|
} else if (strcmp(cmdv[0], "decompress") == 0){
|
|
cpio.decompress();
|
|
} else if (strcmp(cmdv[0], "patch") == 0) {
|
|
cpio.patch();
|
|
} else if (cmdc == 2 && strcmp(cmdv[0], "exists") == 0) {
|
|
exit(!cpio.exists(cmdv[1]));
|
|
} else if (cmdc == 2 && strcmp(cmdv[0], "backup") == 0) {
|
|
cpio.backup(cmdv[1]);
|
|
} else if (cmdc >= 2 && strcmp(cmdv[0], "rm") == 0) {
|
|
bool r = cmdc > 2 && strcmp(cmdv[1], "-r") == 0;
|
|
cpio.rm(cmdv[1 + r], r);
|
|
} else if (cmdc == 3 && strcmp(cmdv[0], "mv") == 0) {
|
|
cpio.mv(cmdv[1], cmdv[2]);
|
|
} else if (strcmp(cmdv[0], "extract") == 0) {
|
|
if (cmdc == 3) {
|
|
return !cpio.extract(cmdv[1], cmdv[2]);
|
|
} else {
|
|
cpio.extract();
|
|
return 0;
|
|
}
|
|
} else if (cmdc == 3 && strcmp(cmdv[0], "mkdir") == 0) {
|
|
cpio.mkdir(strtoul(cmdv[1], nullptr, 8), cmdv[2]);
|
|
} else if (cmdc == 3 && strcmp(cmdv[0], "ln") == 0) {
|
|
cpio.ln(cmdv[1], cmdv[2]);
|
|
} else if (cmdc == 4 && strcmp(cmdv[0], "add") == 0) {
|
|
cpio.add(strtoul(cmdv[1], nullptr, 8), cmdv[2], cmdv[3]);
|
|
} else {
|
|
return 1;
|
|
}
|
|
|
|
--argc;
|
|
++argv;
|
|
}
|
|
|
|
cpio.dump(incpio);
|
|
return 0;
|
|
}
|