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-rw-r--r--drivers/char/tty_ioctl.c170
1 files changed, 104 insertions, 66 deletions
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index 7a003504c265..1bdd2bf4f37d 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -730,13 +730,23 @@ static int send_prio_char(struct tty_struct *tty, char ch)
730 return 0; 730 return 0;
731} 731}
732 732
733int n_tty_ioctl(struct tty_struct * tty, struct file * file, 733/**
734 unsigned int cmd, unsigned long arg) 734 * tty_mode_ioctl - mode related ioctls
735 * @tty: tty for the ioctl
736 * @file: file pointer for the tty
737 * @cmd: command
738 * @arg: ioctl argument
739 *
740 * Perform non line discipline specific mode control ioctls. This
741 * is designed to be called by line disciplines to ensure they provide
742 * consistent mode setting.
743 */
744
745int tty_mode_ioctl(struct tty_struct * tty, struct file *file,
746 unsigned int cmd, unsigned long arg)
735{ 747{
736 struct tty_struct * real_tty; 748 struct tty_struct * real_tty;
737 void __user *p = (void __user *)arg; 749 void __user *p = (void __user *)arg;
738 int retval;
739 struct tty_ldisc *ld;
740 750
741 if (tty->driver->type == TTY_DRIVER_TYPE_PTY && 751 if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
742 tty->driver->subtype == PTY_TYPE_MASTER) 752 tty->driver->subtype == PTY_TYPE_MASTER)
@@ -799,6 +809,93 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
799 return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); 809 return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
800 case TCSETA: 810 case TCSETA:
801 return set_termios(real_tty, p, TERMIOS_TERMIO); 811 return set_termios(real_tty, p, TERMIOS_TERMIO);
812#ifndef TCGETS2
813 case TIOCGLCKTRMIOS:
814 if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
815 return -EFAULT;
816 return 0;
817
818 case TIOCSLCKTRMIOS:
819 if (!capable(CAP_SYS_ADMIN))
820 return -EPERM;
821 if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
822 return -EFAULT;
823 return 0;
824#else
825 case TIOCGLCKTRMIOS:
826 if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked))
827 return -EFAULT;
828 return 0;
829
830 case TIOCSLCKTRMIOS:
831 if (!capable(CAP_SYS_ADMIN))
832 return -EPERM;
833 if (user_termios_to_kernel_termios_1(real_tty->termios_locked, (struct termios __user *) arg))
834 return -EFAULT;
835 return 0;
836#endif
837 case TIOCGSOFTCAR:
838 return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg);
839 case TIOCSSOFTCAR:
840 if (get_user(arg, (unsigned int __user *) arg))
841 return -EFAULT;
842 mutex_lock(&tty->termios_mutex);
843 tty->termios->c_cflag =
844 ((tty->termios->c_cflag & ~CLOCAL) |
845 (arg ? CLOCAL : 0));
846 mutex_unlock(&tty->termios_mutex);
847 return 0;
848 default:
849 return -ENOIOCTLCMD;
850 }
851}
852
853EXPORT_SYMBOL_GPL(tty_mode_ioctl);
854
855int tty_perform_flush(struct tty_struct *tty, unsigned long arg)
856{
857 struct tty_ldisc *ld;
858 int retval = tty_check_change(tty);
859 if (retval)
860 return retval;
861
862 ld = tty_ldisc_ref(tty);
863 switch (arg) {
864 case TCIFLUSH:
865 if (ld && ld->flush_buffer)
866 ld->flush_buffer(tty);
867 break;
868 case TCIOFLUSH:
869 if (ld && ld->flush_buffer)
870 ld->flush_buffer(tty);
871 /* fall through */
872 case TCOFLUSH:
873 if (tty->driver->flush_buffer)
874 tty->driver->flush_buffer(tty);
875 break;
876 default:
877 tty_ldisc_deref(ld);
878 return -EINVAL;
879 }
880 tty_ldisc_deref(ld);
881 return 0;
882}
883
884EXPORT_SYMBOL_GPL(tty_perform_flush);
885
886int n_tty_ioctl(struct tty_struct * tty, struct file * file,
887 unsigned int cmd, unsigned long arg)
888{
889 struct tty_struct * real_tty;
890 int retval;
891
892 if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
893 tty->driver->subtype == PTY_TYPE_MASTER)
894 real_tty = tty->link;
895 else
896 real_tty = tty;
897
898 switch (cmd) {
802 case TCXONC: 899 case TCXONC:
803 retval = tty_check_change(tty); 900 retval = tty_check_change(tty);
804 if (retval) 901 if (retval)
@@ -829,30 +926,7 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
829 } 926 }
830 return 0; 927 return 0;
831 case TCFLSH: 928 case TCFLSH:
832 retval = tty_check_change(tty); 929 return tty_perform_flush(tty, arg);
833 if (retval)
834 return retval;
835
836 ld = tty_ldisc_ref(tty);
837 switch (arg) {
838 case TCIFLUSH:
839 if (ld && ld->flush_buffer)
840 ld->flush_buffer(tty);
841 break;
842 case TCIOFLUSH:
843 if (ld && ld->flush_buffer)
844 ld->flush_buffer(tty);
845 /* fall through */
846 case TCOFLUSH:
847 if (tty->driver->flush_buffer)
848 tty->driver->flush_buffer(tty);
849 break;
850 default:
851 tty_ldisc_deref(ld);
852 return -EINVAL;
853 }
854 tty_ldisc_deref(ld);
855 return 0;
856 case TIOCOUTQ: 930 case TIOCOUTQ:
857 return put_user(tty->driver->chars_in_buffer ? 931 return put_user(tty->driver->chars_in_buffer ?
858 tty->driver->chars_in_buffer(tty) : 0, 932 tty->driver->chars_in_buffer(tty) : 0,
@@ -862,32 +936,6 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
862 if (L_ICANON(tty)) 936 if (L_ICANON(tty))
863 retval = inq_canon(tty); 937 retval = inq_canon(tty);
864 return put_user(retval, (unsigned int __user *) arg); 938 return put_user(retval, (unsigned int __user *) arg);
865#ifndef TCGETS2
866 case TIOCGLCKTRMIOS:
867 if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
868 return -EFAULT;
869 return 0;
870
871 case TIOCSLCKTRMIOS:
872 if (!capable(CAP_SYS_ADMIN))
873 return -EPERM;
874 if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
875 return -EFAULT;
876 return 0;
877#else
878 case TIOCGLCKTRMIOS:
879 if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked))
880 return -EFAULT;
881 return 0;
882
883 case TIOCSLCKTRMIOS:
884 if (!capable(CAP_SYS_ADMIN))
885 return -EPERM;
886 if (user_termios_to_kernel_termios_1(real_tty->termios_locked, (struct termios __user *) arg))
887 return -EFAULT;
888 return 0;
889#endif
890
891 case TIOCPKT: 939 case TIOCPKT:
892 { 940 {
893 int pktmode; 941 int pktmode;
@@ -906,19 +954,9 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
906 tty->packet = 0; 954 tty->packet = 0;
907 return 0; 955 return 0;
908 } 956 }
909 case TIOCGSOFTCAR:
910 return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg);
911 case TIOCSSOFTCAR:
912 if (get_user(arg, (unsigned int __user *) arg))
913 return -EFAULT;
914 mutex_lock(&tty->termios_mutex);
915 tty->termios->c_cflag =
916 ((tty->termios->c_cflag & ~CLOCAL) |
917 (arg ? CLOCAL : 0));
918 mutex_unlock(&tty->termios_mutex);
919 return 0;
920 default: 957 default:
921 return -ENOIOCTLCMD; 958 /* Try the mode commands */
959 return tty_mode_ioctl(tty, file, cmd, arg);
922 } 960 }
923} 961}
924 962
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-30 13:34:17 -0400