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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 C190CC18E5B for ; Tue, 10 Mar 2020 13:23:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 99AE4222D9 for ; Tue, 10 Mar 2020 13:23:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583846595; bh=MXln7nZqWGaCBLy6dtD8fUgYZiJwCNGm/S6MIDZKz0A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=CV34MZuF4V3Yn8QaNobrpr6M01/RaPWYfhvPWp15V6uKyDjhvAqfOgTKxaSO88qii sIVz5rYq8U0l8ftB+pviB5Lp8gStOAvet8OmW/XUkbm083x2fZ3LcjeRULLh99sGme SbiZknLVat+n6olxKFcRbXV/dArCyKNNb/42777w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727191AbgCJM7s (ORCPT ); Tue, 10 Mar 2020 08:59:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:40374 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727175AbgCJM7s (ORCPT ); Tue, 10 Mar 2020 08:59:48 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 23AC32467D; Tue, 10 Mar 2020 12:59:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583845187; bh=MXln7nZqWGaCBLy6dtD8fUgYZiJwCNGm/S6MIDZKz0A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MB4yEg/jG2a36gCjYWb5SFr1TVEsdakOD5KRM7j2b9m3or+DPsTCl3z36B8NUK3X0 o2r+XtBqmNsJcxtbxvWZ73QiGVGhJ3KnPszNb5BOP3uPSZOgjH0/M/bvrS5zCfF8PY sIRvxdLX+nDKN4gj9YaG26H2xFDXuRkWeW4Lj0kk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jiri Slaby Subject: [PATCH 5.5 093/189] vt: selection, push console lock down Date: Tue, 10 Mar 2020 13:38:50 +0100 Message-Id: <20200310123649.111221683@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200310123639.608886314@linuxfoundation.org> References: <20200310123639.608886314@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jiri Slaby commit 4b70dd57a15d2f4685ac6e38056bad93e81e982f upstream. We need to nest the console lock in sel_lock, so we have to push it down a bit. Fortunately, the callers of set_selection_* just lock the console lock around the function call. So moving it down is easy. In the next patch, we switch the order. Signed-off-by: Jiri Slaby Fixes: 07e6124a1a46 ("vt: selection, close sel_buffer race") Cc: stable Link: https://lore.kernel.org/r/20200228115406.5735-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman --- drivers/staging/speakup/selection.c | 2 -- drivers/tty/vt/selection.c | 13 ++++++++++++- drivers/tty/vt/vt.c | 2 -- 3 files changed, 12 insertions(+), 5 deletions(-) --- a/drivers/staging/speakup/selection.c +++ b/drivers/staging/speakup/selection.c @@ -51,9 +51,7 @@ static void __speakup_set_selection(stru goto unref; } - console_lock(); set_selection_kernel(&sel, tty); - console_unlock(); unref: tty_kref_put(tty); --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -181,7 +181,7 @@ int set_selection_user(const struct tioc return set_selection_kernel(&v, tty); } -int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty) +static int __set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty) { struct vc_data *vc = vc_cons[fg_console].d; int new_sel_start, new_sel_end, spc; @@ -343,6 +343,17 @@ unlock: mutex_unlock(&sel_lock); return ret; } + +int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty) +{ + int ret; + + console_lock(); + ret = __set_selection_kernel(v, tty); + console_unlock(); + + return ret; +} EXPORT_SYMBOL_GPL(set_selection_kernel); /* Insert the contents of the selection buffer into the --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -3046,10 +3046,8 @@ int tioclinux(struct tty_struct *tty, un switch (type) { case TIOCL_SETSEL: - console_lock(); ret = set_selection_user((struct tiocl_selection __user *)(p+1), tty); - console_unlock(); break; case TIOCL_PASTESEL: ret = paste_selection(tty);