ioctl: implement the superuser bit

We need to check this at the syscall level so we can allow it to be invoked
internally without security restrictions but directly with

diff --git a/Kernel/syscall_fs.c b/Kernel/syscall_fs.c
index 6ce0d2e..3a175ca 100644 (file)
--- a/Kernel/syscall_fs.c
+++ b/Kernel/syscall_fs.c
@@ -257,23 +257,26 @@ int16_t _ioctl(void)
        uint16_t dev;
 
        if ((ino = getinode(fd)) == NULLINODE)
-               return (-1);
+               return -1;
 
        if (!(isdevice(ino))) {
                udata.u_error = ENOTTY;
-               return (-1);
+               return -1;
        }
 
+       if ((request & IOCTL_SUPER) && esuper())
+               return -1;
+
        if (!(getperm(ino) & OTH_WR)) {
                udata.u_error = EPERM;
-               return (-1);
+               return -1;
        }
 
        dev = ino->c_node.i_addr[0];
 
        /* top bit of request is reserved for kernel originated magic */
        if (d_ioctl(dev, request & 0x7FFF, data))
-               return (-1);
+               return -1;
        return (0);
 }