Commit 35bb12d7 authored by Dmitry Vyukov's avatar Dmitry Vyukov Committed by Ben Hutchings

tty: limit terminal size to 4M chars

commit 32b2921e upstream.

Size of kmalloc() in vc_do_resize() is controlled by user.
Too large kmalloc() size triggers WARNING message on console.
Put a reasonable upper bound on terminal size to prevent WARNINGs.
Signed-off-by: default avatarDmitry Vyukov <dvyukov@google.com>
CC: David Rientjes <rientjes@google.com>
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: linux-kernel@vger.kernel.org
Cc: syzkaller@googlegroups.com
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent c7bd359b
...@@ -863,6 +863,8 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, ...@@ -863,6 +863,8 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
return 0; return 0;
if (new_screen_size > (4 << 20))
return -EINVAL;
newscreen = kmalloc(new_screen_size, GFP_USER); newscreen = kmalloc(new_screen_size, GFP_USER);
if (!newscreen) if (!newscreen)
return -ENOMEM; return -ENOMEM;
......
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