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Magisk
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Pull out common logic

This commit is contained in:
topjohnwu 2019-12-06 15:31:49 -05:00
parent 4bb8ad19cf
commit d22b9c26b6
1 changed files with 46 additions and 41 deletions
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87
native/jni/init/rootdir.cpp
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@ -225,6 +225,48 @@ static void sbin_overlay(const raw_data &self, const raw_data &config) {
xsymlink("./magiskinit", "/sbin/supolicy");
}
static void recreate_sbin(const char *mirror) {
int src = xopen(mirror, O_RDONLY | O_CLOEXEC);
int dest = xopen("/sbin", O_RDONLY | O_CLOEXEC);
DIR *fp = fdopendir(src);
char buf[256];
bool use_bind_mount = true;
for (dirent *entry; (entry = xreaddir(fp));) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
struct stat st;
fstatat(src, entry->d_name, &st, AT_SYMLINK_NOFOLLOW);
if (S_ISLNK(st.st_mode)) {
xreadlinkat(src, entry->d_name, buf, sizeof(buf));
xsymlinkat(buf, dest, entry->d_name);
} else {
char sbin_path[256];
sprintf(buf, "%s/%s", mirror, entry->d_name);
sprintf(sbin_path, "/sbin/%s", entry->d_name);
if (use_bind_mount) {
// Create dummy
if (S_ISDIR(st.st_mode))
xmkdir(sbin_path, st.st_mode & 0777);
else
close(xopen(sbin_path, O_CREAT | O_WRONLY | O_CLOEXEC, st.st_mode & 0777));
if (xmount(buf, sbin_path, nullptr, MS_BIND, nullptr)) {
// Bind mount failed, fallback to symlink
remove(sbin_path);
use_bind_mount = false;
} else {
continue;
}
}
xsymlink(buf, sbin_path);
}
}
close(src);
close(dest);
}
#define ROOTMIR MIRRDIR "/system_root"
#define ROOTBLK BLOCKDIR "/system_root"
#define MONOPOLICY "/sepolicy"
@ -268,39 +310,13 @@ void SARBase::patch_rootdir() {
xmount(ROOTBLK, ROOTMIR, "erofs", MS_RDONLY, nullptr);
// Recreate original sbin structure
int src = xopen(ROOTMIR "/sbin", O_RDONLY | O_CLOEXEC);
int dest = xopen("/sbin", O_RDONLY | O_CLOEXEC);
DIR *fp = fdopendir(src);
struct dirent *entry;
struct stat st;
char buf[256];
while ((entry = xreaddir(fp))) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
fstatat(src, entry->d_name, &st, AT_SYMLINK_NOFOLLOW);
if (S_ISLNK(st.st_mode)) {
xreadlinkat(src, entry->d_name, buf, sizeof(buf));
xsymlinkat(buf, dest, entry->d_name);
} else {
char spath[256];
sprintf(buf, "/sbin/%s", entry->d_name);
sprintf(spath, ROOTMIR "/sbin/%s", entry->d_name);
// Create dummy
if (S_ISDIR(st.st_mode))
xmkdir(buf, st.st_mode & 0777);
else
close(xopen(buf, O_CREAT | O_WRONLY | O_CLOEXEC, st.st_mode & 0777));
xmount(spath, buf, nullptr, MS_BIND, nullptr);
}
}
close(src);
close(dest);
recreate_sbin(ROOTMIR "/sbin");
// Patch init
raw_data init;
file_attr attr;
bool redirect = false;
src = xopen("/init", O_RDONLY | O_CLOEXEC);
int src = xopen("/init", O_RDONLY | O_CLOEXEC);
fd_full_read(src, init.buf, init.sz);
fgetattr(src, &attr);
close(src);
@ -320,7 +336,7 @@ void SARBase::patch_rootdir() {
}
}
xmkdir(ROOTOVL, 0);
dest = xopen(ROOTOVL "/init", O_CREAT | O_WRONLY | O_CLOEXEC);
int dest = xopen(ROOTOVL "/init", O_CREAT | O_WRONLY | O_CLOEXEC);
xwrite(dest, init.buf, init.sz);
fsetattr(dest, &attr);
close(dest);
@ -483,18 +499,7 @@ int magisk_proxy_main(int argc, char *argv[]) {
sbin_overlay(self, config);
// Create symlinks pointing back to /root
char path[256];
int sbin = xopen("/sbin", O_RDONLY | O_CLOEXEC);
DIR *dir = xopendir("/root");
struct dirent *entry;
while((entry = xreaddir(dir))) {
if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue;
sprintf(path, "/root/%s", entry->d_name);
xsymlinkat(path, sbin, entry->d_name);
}
close(sbin);
closedir(dir);
recreate_sbin("/root");
setenv("REMOUNT_ROOT", "1", 1);
execv("/sbin/magisk", argv);