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Unlock all blocks to non-read-only

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Check more info: https://android.googlesource.com/platform/system/core/+/e18c0d5%5E!/
Should fix all root apps with issue gaining rw access to /system
This commit is contained in:
topjohnwu 2017-02-14 06:31:18 +08:00
parent f269695d4a
commit 6bf19ecc34
1 changed files with 31 additions and 0 deletions
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31
daemon.c
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@ -24,6 +24,7 @@
#include <sys/wait.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
@ -42,6 +43,7 @@
#include <termios.h>
#include <signal.h>
#include <string.h>
#include <dirent.h>
#include <selinux/selinux.h>
#ifdef SUPERUSER_EMBEDDED
@ -451,6 +453,33 @@ static int daemon_accept(int fd) {
return run_daemon_child(infd, outfd, errfd, argc, argv);
}
static void unlock_blocks() {
#define DEV_BLOCKS "/dev/block"
char path[PATH_MAX];
DIR *dir;
struct dirent *entry;
int fd, OFF = 0;
if (!(dir = opendir(DEV_BLOCKS)))
return;
while((entry = readdir(dir))) {
if (entry->d_type == DT_BLK && strstr(entry->d_name, "mmc") != NULL) {
sprintf(path, "%s/%s", DEV_BLOCKS, entry->d_name);
fd = open(path, O_RDONLY);
if (fd < 0) {
PLOGE("open");
continue;
}
if (ioctl(fd, BLKROSET, &OFF) == -1)
PLOGE("ioctl");
close(fd);
}
}
closedir(dir);
}
int run_daemon() {
if (getuid() != AID_ROOT || getgid() != AID_ROOT) {
PLOGE("daemon requires root. uid/gid not root");
@ -476,6 +505,8 @@ int run_daemon() {
return -1;
}
unlock_blocks();
int fd;
struct sockaddr_un sun;