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| author | Nicolas Pitre <nico@fluxnic.net> | 2019-11-05 10:33:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-13 08:49:41 +0100 |
| commit | a006855c86ede879fd57b6a944cd9a5b89a9cdce (patch) | |
| tree | a57fa266d0057e768aa47ce9ff473c2adbd81d3f /drivers/tty | |
| parent | df06454a0d51ba1905af12bdac26a12c1c5e3ca0 (diff) | |
| download | linux-stable-a006855c86ede879fd57b6a944cd9a5b89a9cdce.tar.gz linux-stable-a006855c86ede879fd57b6a944cd9a5b89a9cdce.tar.bz2 linux-stable-a006855c86ede879fd57b6a944cd9a5b89a9cdce.zip | |
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/vt/vc_screen.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; |