From patchwork Mon Nov 7 14:16:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Ogness X-Patchwork-Id: 622468 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27C23C433FE for ; Mon, 7 Nov 2022 14:18:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232225AbiKGOSN (ORCPT ); Mon, 7 Nov 2022 09:18:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232250AbiKGOR1 (ORCPT ); Mon, 7 Nov 2022 09:17:27 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2101A1D31F; Mon, 7 Nov 2022 06:16:57 -0800 (PST) From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1667830615; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gS+TlnBfnvuNwOKZQIZcdjPH9bhpfrs5K1fOz4tyq8E=; b=djqqVbIJuMlxRG/KUYbjTE3WlJPb8/4BRjZqiVgvYMTr7/Sg0autRsyaU2JWaZq3VN3Mfw OwXHjvPPuCWuVO7A4iO0R7oz5UwNRLhdk02uk4jpCy9Gt7MNNPJoFi4PLw9QL+wwMeqZgG x8w4JTnSU8McnTmTMP+zEv1TCPiXlXiHUYwTYDDfpGnYPpWIDb6LZ00TZMmkMkukcDDlD8 pGbuhmV/Z89XLkI7qVEP/xlfkQntbD1FliCvEtwapvNn1D8KcDpxh7Pcm+BFSRCbglYTQK WSb0+BfzqLoXNbMVTMuI8qVDma66XMtIjHtCHVcUsZm6wYyw6AxM9KLuzMDR0g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1667830615; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gS+TlnBfnvuNwOKZQIZcdjPH9bhpfrs5K1fOz4tyq8E=; b=M60ZeenQNKgOoEahohQx+InKZNToZ2PTl+S+h/Y9/Dwe3ZAZMQrMX+0/9pXQL0rFd4ySGx /D2ZyiONrI29IoCg== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org, Helge Deller , Greg Kroah-Hartman , Javier Martinez Canillas , Thomas Zimmermann , Juergen Gross , Boris Ostrovsky , Tom Rix , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH printk v3 33/40] printk, xen: fbfront: create/use safe function for forcing preferred Date: Mon, 7 Nov 2022 15:22:31 +0106 Message-Id: <20221107141638.3790965-34-john.ogness@linutronix.de> In-Reply-To: <20221107141638.3790965-1-john.ogness@linutronix.de> References: <20221107141638.3790965-1-john.ogness@linutronix.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org With commit 9e124fe16ff2("xen: Enable console tty by default in domU if it's not a dummy") a hack was implemented to make sure that the tty console remains the console behind the /dev/console device. The main problem with the hack is that, after getting the console pointer to the tty console, it is assumed the pointer is still valid after releasing the console_sem. This assumption is incorrect and unsafe. Make the hack safe by introducing a new function console_force_preferred_locked() and perform the full operation under the console_list_lock. Signed-off-by: John Ogness --- drivers/video/fbdev/xen-fbfront.c | 12 +++------ include/linux/console.h | 1 + kernel/printk/printk.c | 44 ++++++++++++++++++++++++++++--- 3 files changed, 46 insertions(+), 11 deletions(-) diff --git a/drivers/video/fbdev/xen-fbfront.c b/drivers/video/fbdev/xen-fbfront.c index 4d2694d904aa..8752d389e382 100644 --- a/drivers/video/fbdev/xen-fbfront.c +++ b/drivers/video/fbdev/xen-fbfront.c @@ -504,18 +504,14 @@ static void xenfb_make_preferred_console(void) if (console_set_on_cmdline) return; - console_lock(); + console_list_lock(); for_each_console(c) { if (!strcmp(c->name, "tty") && c->index == 0) break; } - console_unlock(); - if (c) { - unregister_console(c); - c->flags |= CON_CONSDEV; - c->flags &= ~CON_PRINTBUFFER; /* don't print again */ - register_console(c); - } + if (c) + console_force_preferred_locked(c); + console_list_unlock(); } static int xenfb_resume(struct xenbus_device *dev) diff --git a/include/linux/console.h b/include/linux/console.h index cdae70e27377..b6b5d796d15c 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -273,6 +273,7 @@ enum con_flush_mode { }; extern int add_preferred_console(char *name, int idx, char *options); +extern void console_force_preferred_locked(struct console *con); extern void register_console(struct console *); extern int unregister_console(struct console *); extern void console_lock(void); diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index be40a9688403..d74e6e609f7d 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -247,9 +247,10 @@ int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void console_list_lock(void) { /* - * In unregister_console(), synchronize_srcu() is called with the - * console_list_lock held. Therefore it is not allowed that the - * console_list_lock is taken with the srcu_lock held. + * In unregister_console() and console_force_preferred_locked(), + * synchronize_srcu() is called with the console_list_lock held. + * Therefore it is not allowed that the console_list_lock is taken + * with the srcu_lock held. * * Whether or not this context is in the read-side critical section * can only be detected if the appropriate debug options are enabled. @@ -3457,6 +3458,43 @@ int unregister_console(struct console *console) } EXPORT_SYMBOL(unregister_console); +/** + * console_force_preferred_locked - force a registered console preferred + * @con: The registered console to force preferred. + * + * Must be called under console_list_lock(). + */ +void console_force_preferred_locked(struct console *con) +{ + struct console *cur_pref_con; + + if (!console_is_registered_locked(con)) + return; + + cur_pref_con = console_first(); + + /* Already preferred? */ + if (cur_pref_con == con) + return; + + hlist_del_init_rcu(&con->node); + + /* + * Ensure that all SRCU list walks have completed so that the console + * can be added to the beginning of the console list and its forward + * list pointer can be re-initialized. + */ + synchronize_srcu(&console_srcu); + + con->flags |= CON_CONSDEV; + WARN_ON(!con->device); + + /* Only the new head can have CON_CONSDEV set. */ + WRITE_ONCE(cur_pref_con->flags, cur_pref_con->flags & ~CON_CONSDEV); + hlist_add_behind_rcu(&con->node, console_list.first); +} +EXPORT_SYMBOL(console_force_preferred_locked); + /* * Initialize the console device. This is called *early*, so * we can't necessarily depend on lots of kernel help here.