From: Nicolas Pitre <nico@fluxnic.net>
Date: Tue, 5 Nov 2019 09:33:16 +0000 (+0100)
Subject: vcs: prevent write access to vcsu devices
X-Git-Tag: v4.19.89~15
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=627f3b9e4dd812dac9d93e578af80de751e704a4;p=thirdparty%2Fkernel%2Fstable.git

vcs: prevent write access to vcsu devices

commit 0c9acb1af77a3cb8707e43f45b72c95266903cee upstream.

Commit d21b0be246bf ("vt: introduce unicode mode for /dev/vcs") guarded
against using devices containing attributes as this is not yet
implemented. It however failed to guard against writes to any devices
as this is also unimplemented.

Reported-by: Or Cohen <orcohen@paloaltonetworks.com>
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Cc: <stable@vger.kernel.org> # v4.19+
Cc: Jiri Slaby <jslaby@suse.com>
Fixes: d21b0be246bf ("vt: introduce unicode mode for /dev/vcs")
Link: https://lore.kernel.org/r/nycvar.YSQ.7.76.1911051030580.30289@knanqh.ubzr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
index 2384ea85ffafe..2fb509d57e88c 100644
--- a/drivers/tty/vt/vc_screen.c
+++ b/drivers/tty/vt/vc_screen.c
@@ -437,6 +437,9 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 	size_t ret;
 	char *con_buf;
 
+	if (use_unicode(inode))
+		return -EOPNOTSUPP;
+
 	con_buf = (char *) __get_free_page(GFP_KERNEL);
 	if (!con_buf)
 		return -ENOMEM;