This is a note to let you know that I've just added the patch titled
tty: Reset hupped state on open
to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From d4855e1fc03c2bb32dd64badf51cec5a2a26ab2a Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Date: Tue, 19 Nov 2013 08:46:27 -0500
Subject: 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>
Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.12
Tested-by: Heorhi Valakhanovich <valahanovich@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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 3a1a01af..c74a00ad 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);
--
1.8.4.3.gca3854a
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