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tty: Prevent untrappable signals from malicious program

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Commit 26df6d1340 ("tty: Add EXTPROC support for LINEMODE")
allows a process which has opened a pty master to send _any_ signal
to the process group of the pty slave. Although potentially
exploitable by a malicious program running a setuid program on
a pty slave, it's unknown if this exploit currently exists.

Limit to signals actually used.

Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Howard Chu <hyc@symas.com>
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: <stable@vger.kernel.org> # 2.6.36+
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-01-19 13:05:03 -05:00 committed by Greg Kroah-Hartman
parent 19e3ae6b4f
commit 37480a0568
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/pty.c
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@ -210,6 +210,9 @@ static int pty_signal(struct tty_struct *tty, int sig)
{
struct pid *pgrp;
if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
return -EINVAL;
if (tty->link) {
pgrp = tty_get_pgrp(tty->link);
if (pgrp)