Magisk/native/jni/magiskboot/ramdisk.cpp

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#include <string.h>
#include <stdlib.h>
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#include <sys/stat.h>
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#include <utils.h>
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#include <cpio.h>
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#include "magiskboot.h"
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#include "compress.h"
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using namespace std;
constexpr char RAMDISK_XZ[] = "ramdisk.cpio.xz";
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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",
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"overlay/init.magisk.rc" };
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class magisk_cpio : public cpio_rw {
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public:
magisk_cpio() = default;
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explicit magisk_cpio(const char *filename) : cpio_rw(filename) {}
void patch();
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int test();
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char *sha1();
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void restore();
void backup(const char *orig);
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void compress();
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void decompress();
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};
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++;
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bool fstab = (!keepverity || !keepforceencrypt) &&
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!str_starts(cur->first, ".backup") &&
str_contains(cur->first, "fstab") && S_ISREG(cur->second->mode);
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if (!keepverity) {
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if (fstab) {
fprintf(stderr, "Found fstab file [%s]\n", cur->first.data());
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patch_verity(cur->second->data, cur->second->filesize, true);
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} else if (cur->first == "verity_key") {
rm(cur);
continue;
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}
}
if (!keepforceencrypt) {
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if (fstab) {
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patch_encryption(cur->second->data, cur->second->filesize);
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}
}
}
}
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#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)
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int magisk_cpio::test() {
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for (auto file : UNSUPPORT_LIST)
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if (exists(file))
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return UNSUPPORTED_CPIO;
int flags = STOCK_BOOT;
if (exists(RAMDISK_XZ)) {
flags |= COMPRESSED_CPIO | MAGISK_PATCHED;
decompress();
}
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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;
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}
#define for_each_line(line, buf, size) \
for (line = (char *) buf; line < (char *) buf + size && line[0]; line = strchr(line + 1, '\n') + 1)
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char *magisk_cpio::sha1() {
decompress();
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char sha1[41];
char *line;
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for (auto &e : entries) {
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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);
}
}
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} 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);
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sha1[40] = '\0';
return strdup(sha1);
}
}
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} else if (e.first == ".backup/.sha1") {
return (char *) e.second->data;
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}
}
return nullptr;
}
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#define for_each_str(str, buf, size) \
for (str = (char *) buf; str < (char *) buf + size; str = str += strlen(str) + 1)
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void magisk_cpio::restore() {
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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++;
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if (str_starts(cur->first, ".backup")) {
if (cur->first.length() == 7 || cur->first.substr(8) == ".magisk") {
rm(cur);
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} else {
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mv(cur, &cur->first[8]);
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}
} else if (str_starts(cur->first, "magisk") ||
cur->first == "overlay/init.magisk.rc" ||
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cur->first == "sbin/magic_mask.sh" ||
cur->first == "init.magisk.rc") {
// Some known stuff we can remove
rm(cur);
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}
}
}
void magisk_cpio::backup(const char *orig) {
if (access(orig, R_OK))
return;
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entry_map bkup_entries;
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string remv;
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auto b = new cpio_entry(".backup", S_IFDIR);
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bkup_entries[b->filename].reset(b);
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magisk_cpio o(orig);
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// Remove possible backups in original ramdisk
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o.rm(".backup", true);
rm(".backup", true);
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auto lhs = o.entries.begin();
auto rhs = entries.begin();
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while (lhs != o.entries.end() || rhs != entries.end()) {
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int res;
bool backup = false;
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if (lhs != o.entries.end() && rhs != entries.end()) {
res = lhs->first.compare(rhs->first);
} else if (lhs == o.entries.end()) {
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res = 1;
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} else {
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res = -1;
}
if (res < 0) {
// Something is missing in new ramdisk, backup!
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backup = true;
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fprintf(stderr, "Backup missing entry: ");
} else if (res == 0) {
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if (lhs->second->filesize != rhs->second->filesize ||
memcmp(lhs->second->data, rhs->second->data, lhs->second->filesize) != 0) {
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// Not the same!
backup = true;
fprintf(stderr, "Backup mismatch entry: ");
}
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} else {
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// Something new in ramdisk
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remv += rhs->first;
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remv += (char) '\0';
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fprintf(stderr, "Record new entry: [%s] -> [.backup/.rmlist]\n", rhs->first.data());
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}
if (backup) {
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string back_name(".backup/");
back_name += lhs->first;
fprintf(stderr, "[%s] -> [%s]\n", lhs->first.data(), back_name.data());
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auto ex = static_cast<cpio_entry*>(lhs->second.release());
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ex->filename = back_name;
bkup_entries[ex->filename].reset(ex);
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}
// Increment positions
if (res < 0) {
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++lhs;
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} else if (res == 0) {
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++lhs; ++rhs;
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} else {
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++rhs;
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}
}
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if (!remv.empty()) {
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auto rmlist = new cpio_entry(".backup/.rmlist", S_IFREG);
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rmlist->filesize = remv.length();
rmlist->data = xmalloc(remv.length());
memcpy(rmlist->data, remv.data(), remv.length());
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bkup_entries[rmlist->filename].reset(rmlist);
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}
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if (bkup_entries.size() > 1)
entries.merge(bkup_entries);
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}
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void magisk_cpio::compress() {
if (exists(RAMDISK_XZ))
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return;
fprintf(stderr, "Compressing cpio -> [%s]\n", RAMDISK_XZ);
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auto init = entries.extract("init");
uint8_t *data;
size_t len;
FILE *fp = open_stream(get_encoder(XZ, open_stream<byte_stream>(data, len)));
dump(fp);
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entries.clear();
entries.insert(std::move(init));
auto xz = new cpio_entry(RAMDISK_XZ, S_IFREG);
xz->data = data;
xz->filesize = len;
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insert(xz);
}
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void magisk_cpio::decompress() {
auto it = entries.find(RAMDISK_XZ);
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if (it == entries.end())
return;
fprintf(stderr, "Decompressing cpio [%s]\n", RAMDISK_XZ);
char *data;
size_t len;
auto strm = get_decoder(XZ, open_stream<byte_stream>(data, len));
strm->write(it->second->data, it->second->filesize);
delete strm;
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entries.erase(it);
load_cpio(data, len);
free(data);
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}
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int cpio_commands(int argc, char *argv[]) {
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char *incpio = argv[0];
++argv;
--argc;
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magisk_cpio cpio;
if (access(incpio, R_OK) == 0)
cpio.load_cpio(incpio);
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int cmdc;
char *cmdv[6];
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while (argc) {
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// Clean up
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cmdc = 0;
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memset(cmdv, NULL, sizeof(cmdv));
// Split the commands
for (char *tok = strtok(argv[0], " "); tok; tok = strtok(nullptr, " "))
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cmdv[cmdc++] = tok;
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if (cmdc == 0)
continue;
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if (strcmp(cmdv[0], "test") == 0) {
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exit(cpio.test());
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} else if (strcmp(cmdv[0], "restore") == 0) {
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cpio.restore();
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} else if (strcmp(cmdv[0], "sha1") == 0) {
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char *sha1 = cpio.sha1();
if (sha1) printf("%s\n", sha1);
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return 0;
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} else if (strcmp(cmdv[0], "compress") == 0){
cpio.compress();
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} 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) {
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exit(!cpio.exists(cmdv[1]));
} else if (cmdc == 2 && strcmp(cmdv[0], "backup") == 0) {
cpio.backup(cmdv[1]);
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} else if (cmdc >= 2 && strcmp(cmdv[0], "rm") == 0) {
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bool r = cmdc > 2 && strcmp(cmdv[1], "-r") == 0;
cpio.rm(cmdv[1 + r], r);
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} else if (cmdc == 3 && strcmp(cmdv[0], "mv") == 0) {
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cpio.mv(cmdv[1], cmdv[2]);
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} else if (strcmp(cmdv[0], "extract") == 0) {
if (cmdc == 3) {
return !cpio.extract(cmdv[1], cmdv[2]);
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} else {
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cpio.extract();
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return 0;
}
} else if (cmdc == 3 && strcmp(cmdv[0], "mkdir") == 0) {
cpio.mkdir(strtoul(cmdv[1], nullptr, 8), cmdv[2]);
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} else if (cmdc == 3 && strcmp(cmdv[0], "ln") == 0) {
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cpio.ln(cmdv[1], cmdv[2]);
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} else if (cmdc == 4 && strcmp(cmdv[0], "add") == 0) {
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cpio.add(strtoul(cmdv[1], nullptr, 8), cmdv[2], cmdv[3]);
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} else {
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return 1;
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}
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--argc;
++argv;
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}
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cpio.dump(incpio);
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return 0;
}