From: Linus Torvalds Date: Thu, 21 Dec 2017 01:57:06 +0000 (-0800) Subject: n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD) X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=8711719778f9e003be82bba0362e87b97b46c891 n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD) commit 966031f340185eddd05affcf72b740549f056348 upstream. We added support for EXTPROC back in 2010 in commit 26df6d13406d ("tty: Add EXTPROC support for LINEMODE") and the intent was to allow it to override some (all?) ICANON behavior. Quoting from that original commit message: There is a new bit in the termios local flag word, EXTPROC. When this bit is set, several aspects of the terminal driver are disabled. Input line editing, character echo, and mapping of signals are all disabled. This allows the telnetd to turn off these functions when in linemode, but still keep track of what state the user wants the terminal to be in. but the problem turns out that "several aspects of the terminal driver are disabled" is a bit ambiguous, and you can really confuse the n_tty layer by setting EXTPROC and then causing some of the ICANON invariants to no longer be maintained. This fixes at least one such case (TIOCINQ) becoming unhappy because of the confusion over whether ICANON really means ICANON when EXTPROC is set. This basically makes TIOCINQ match the case of read: if EXTPROC is set, we ignore ICANON. Also, make sure to reset the ICANON state ie EXTPROC changes, not just if ICANON changes. Fixes: 26df6d13406d ("tty: Add EXTPROC support for LINEMODE") Reported-by: Tetsuo Handa Reported-by: syzkaller Cc: Jiri Slaby Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 4671f8d671be..304f58ee440d 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -1459,7 +1459,7 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old) BUG_ON(!tty); if (old) - canon_change = (old->c_lflag ^ tty->termios->c_lflag) & ICANON; + canon_change = (old->c_lflag ^ tty->termios->c_lflag) & (ICANON | EXTPROC); if (canon_change) { memset(&tty->read_flags, 0, sizeof tty->read_flags); tty->canon_head = tty->read_tail; @@ -2096,7 +2096,7 @@ static int n_tty_ioctl(struct tty_struct *tty, struct file *file, case TIOCINQ: /* FIXME: Locking */ retval = tty->read_cnt; - if (L_ICANON(tty)) + if (L_ICANON(tty) && !L_EXTPROC(tty)) retval = inq_canon(tty); return put_user(retval, (unsigned int __user *) arg); default: