This is a note to let you know that I've just added the patch titled
vcs: prevent write access to vcsu devices
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-testing 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 be merged to the tty-next branch sometime soon,
after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
>From 0c9acb1af77a3cb8707e43f45b72c95266903cee Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@xxxxxxxxxxx>
Date: Tue, 5 Nov 2019 10:33:16 +0100
Subject: vcs: prevent write access to vcsu devices
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@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Nicolas Pitre <npitre@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.19+
Cc: Jiri Slaby <jslaby@xxxxxxxx>
Fixes: d21b0be246bf ("vt: introduce unicode mode for /dev/vcs")
Link: https://lore.kernel.org/r/nycvar.YSQ.7.76.1911051030580.30289@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/vt/vc_screen.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
index 1f042346e722..778f83ea2249 100644
--- a/drivers/tty/vt/vc_screen.c
+++ b/drivers/tty/vt/vc_screen.c
@@ -456,6 +456,9 @@ 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;
--
2.24.0
