From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 616B3C55179 for ; Thu, 29 Oct 2020 00:56:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0EEAE20790 for ; Thu, 29 Oct 2020 00:56:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603932992; bh=H1HUc4LwNgqJ7DmQxImG33wnqHv70RJG+i8fu6v8IC4=; h=Subject:To:From:Date:List-ID:From; b=eC6E4K7n3bdEGWmJi2buxSMaDTVdaWFAziG/pe8NSZvu6txYxCri05GUv2/hGyQ4L CG4dlpgX9gPQujeMckNVJUQ7rcdbkKLVKYhGY83wUKfmmGdQC0sw3UPNVPJzTysocc AcDU53Y+mw1HIgfCHEiEEUUbOCfPBWfyAJbvSQhQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403765AbgJ2A4X (ORCPT ); Wed, 28 Oct 2020 20:56:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:60526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731630AbgJ1WRg (ORCPT ); Wed, 28 Oct 2020 18:17:36 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F378224733; Wed, 28 Oct 2020 12:41:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603888897; bh=H1HUc4LwNgqJ7DmQxImG33wnqHv70RJG+i8fu6v8IC4=; h=Subject:To:From:Date:From; b=2lecIFGaGRvZz8FSZvjirgwkx3i2HKeuVNa8aljgvjAkYrAzoiQCDjC73nZUzABde qScVAjzpwXo0PXyUveRQ7ZEaWullwqPvYsIyAzNeT5zH+tB2U2dhyQ2TiVGEssHp7a E8OYCXXwVZI+ACmMtOJjcpK5AfZaDsbgghQzr6qQ= Subject: patch "vt: keyboard, simplify vt_kdgkbsent" added to tty-linus To: jslaby@suse.cz, gregkh@linuxfoundation.org, stable@vger.kernel.org From: Date: Wed, 28 Oct 2020 13:42:29 +0100 Message-ID: <16038889494586@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This is a note to let you know that I've just added the patch titled vt: keyboard, simplify vt_kdgkbsent 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-linus 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 hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >From 6ca03f90527e499dd5e32d6522909e2ad390896b Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Mon, 19 Oct 2020 10:55:16 +0200 Subject: vt: keyboard, simplify vt_kdgkbsent Use 'strlen' of the string, add one for NUL terminator and simply do 'copy_to_user' instead of the explicit 'for' loop. This makes the KDGKBSENT case more compact. The only thing we need to take care about is NULL 'func_table[i]'. Use an empty string in that case. The original check for overflow could never trigger as the func_buf strings are always shorter or equal to 'struct kbsentry's. Cc: Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20201019085517.10176-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/keyboard.c | 28 +++++++++------------------- 1 file changed, 9 insertions(+), 19 deletions(-) diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index 0db53b5b3acf..7bfa95c3252c 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -1995,9 +1995,7 @@ int vt_do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) { struct kbsentry *kbs; - char *p; u_char *q; - u_char __user *up; int sz, fnw_sz; int delta; char *first_free, *fj, *fnw; @@ -2023,23 +2021,15 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) i = array_index_nospec(kbs->kb_func, MAX_NR_FUNC); switch (cmd) { - case KDGKBSENT: - sz = sizeof(kbs->kb_string) - 1; /* sz should have been - a struct member */ - up = user_kdgkb->kb_string; - p = func_table[i]; - if(p) - for ( ; *p && sz; p++, sz--) - if (put_user(*p, up++)) { - ret = -EFAULT; - goto reterr; - } - if (put_user('\0', up)) { - ret = -EFAULT; - goto reterr; - } - kfree(kbs); - return ((p && *p) ? -EOVERFLOW : 0); + case KDGKBSENT: { + /* size should have been a struct member */ + unsigned char *from = func_table[i] ? : ""; + + ret = copy_to_user(user_kdgkb->kb_string, from, + strlen(from) + 1) ? -EFAULT : 0; + + goto reterr; + } case KDSKBSENT: if (!perm) { ret = -EPERM; -- 2.29.1