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vt: add permission check for KDSKBMETA ioctl

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KDSKBMETA modifies keyboard meta mode but lacks the !perm check that all
other keyboard setter ioctls in vt_k_ioctl() enforce, allowing a process
to change meta mode on a non-controlling console without authorization.

Assisted-by: AISLE:Snapshot
Cc: stable <stable@kernel.org>
Signed-off-by: Joshua Rogers <linux@joshua.hu>
Link: https://patch.msgid.link/20260731-tty-vt-stuff-v1-2-be99b9da8e30@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joshua Rogers 2026-07-31 09:56:17 +02:00 committed by Greg Kroah-Hartman
parent e25d47a526
commit a7ad003445
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/vt/vt_ioctl.c
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@ -406,6 +406,8 @@ static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd,
/* this could be folded into KDSKBMODE, but for compatibility
reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
case KDSKBMETA:
if (!perm)
return -EPERM;
return vt_do_kdskbmeta(console, arg);
case KDGKBMETA: