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-next 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 also be merged in the next major kernel release during the merge window.
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@fluxnic.net 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@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 --- 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;