On Tue, 19 Nov 2013 08:46:27 -0500 Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote: > Would you please test the patch below and confirm the fix? > > --->%--- > Subject: [PATCH] tty: Reset hupped state on open > > A common security idiom is to hangup the current tty (via vhangup()) > after forking but before execing a root shell. This hangs up any > existing opens which other processes may have and ensures subsequent > opens have the necessary permissions to open the root shell tty/pty. > > Reset the TTY_HUPPED state after the driver has successfully > returned the opened tty (perform the reset while the tty is locked > to avoid racing with concurrent hangups). > > Reported-by: Heorhi Valakhanovich <valahanovich@xxxxxx> > Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> > --- > drivers/tty/tty_io.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c > index 3a1a01a..c74a00a 100644 > --- a/drivers/tty/tty_io.c > +++ b/drivers/tty/tty_io.c > @@ -2086,6 +2086,7 @@ retry_open: > filp->f_op = &tty_fops; > goto retry_open; > } > + clear_bit(TTY_HUPPED, &tty->flags); > tty_unlock(tty); > > It looks like this patch works. It solves my problem. Thanks. Will wait for such fix in mainline. Heorhi. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
