diff options
| -rw-r--r-- | fs/compat_ioctl.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index 65643def318..6b44cdc96fa 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -1194,6 +1194,7 @@ static int vt_check(struct file *file) { struct tty_struct *tty; struct inode *inode = file->f_path.dentry->d_inode; + struct vc_data *vc; if (file->f_op->ioctl != tty_ioctl) return -EINVAL; @@ -1204,12 +1205,16 @@ static int vt_check(struct file *file) if (tty->driver->ioctl != vt_ioctl) return -EINVAL; - + + vc = (struct vc_data *)tty->driver_data; + if (!vc_cons_allocated(vc->vc_num)) /* impossible? */ + return -ENOIOCTLCMD; + /* * To have permissions to do most of the vt ioctls, we either have - * to be the owner of the tty, or super-user. + * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. */ - if (current->signal->tty == tty || capable(CAP_SYS_ADMIN)) + if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) return 1; return 0; } @@ -1310,16 +1315,28 @@ static int do_unimap_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg, struct unimapdesc32 tmp; struct unimapdesc32 __user *user_ud = compat_ptr(arg); int perm = vt_check(file); - - if (perm < 0) return perm; + struct vc_data *vc; + + if (perm < 0) + return perm; if (copy_from_user(&tmp, user_ud, sizeof tmp)) return -EFAULT; + if (tmp.entries) + if (!access_ok(VERIFY_WRITE, compat_ptr(tmp.entries), + tmp.entry_ct*sizeof(struct unipair))) + return -EFAULT; + vc = ((struct tty_struct *)file->private_data)->driver_data; switch (cmd) { case PIO_UNIMAP: - if (!perm) return -EPERM; - return con_set_unimap(vc_cons[fg_console].d, tmp.entry_ct, compat_ptr(tmp.entries)); + if (!perm) + return -EPERM; + return con_set_unimap(vc, tmp.entry_ct, + compat_ptr(tmp.entries)); case GIO_UNIMAP: - return con_get_unimap(vc_cons[fg_console].d, tmp.entry_ct, &(user_ud->entry_ct), compat_ptr(tmp.entries)); + if (!perm && fg_console != vc->vc_num) + return -EPERM; + return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), + compat_ptr(tmp.entries)); } return 0; } |