From nobody Sat Feb 7 02:56:32 2026 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 C514DC4332F for ; Wed, 19 Oct 2022 09:17:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233146AbiJSJRv (ORCPT ); Wed, 19 Oct 2022 05:17:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233349AbiJSJOm (ORCPT ); Wed, 19 Oct 2022 05:14:42 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 923AD42D7E; Wed, 19 Oct 2022 02:04:57 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5560B617DF; Wed, 19 Oct 2022 09:04:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CE17C433D6; Wed, 19 Oct 2022 09:04:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666170293; bh=C+1GBcd4vi3x1Lbhy7+9mb4yrjJTjU/i8BhkPvezHH8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VCU/fSTZxFMQKTQa5D3I19vpyszspxuEd4PuWiJDOfCjBIMpxq0Lezvg/5tKMmjcs yU2DNkzayF5+Tdi+zfsu8gCOHtqWKk1FDQKBLRsFTvgtHO4xbmF28AK+vmEZlXLzbR 3WoiO+drPWydrlPm232Um7UB+7rg7wJ0vKLfXlQs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrew Morton , Ard Biesheuvel , David Gow , Julius Werner , Petr Mladek , Evan Green , "Guilherme G. Piccoli" , Sasha Levin Subject: [PATCH 6.0 563/862] firmware: google: Test spinlock on panic path to avoid lockups Date: Wed, 19 Oct 2022 10:30:50 +0200 Message-Id: <20221019083314.864066698@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Guilherme G. Piccoli [ Upstream commit 3e081438b8e639cc76ef1a5ce0c1bd8a154082c7 ] Currently the gsmi driver registers a panic notifier as well as reboot and die notifiers. The callbacks registered are called in atomic and very limited context - for instance, panic disables preemption and local IRQs, also all secondary CPUs (not executing the panic path) are shutdown. With that said, taking a spinlock in this scenario is a dangerous invitation for lockup scenarios. So, fix that by checking if the spinlock is free to acquire in the panic notifier callback - if not, bail-out and avoid a potential hang. Fixes: 74c5b31c6618 ("driver: Google EFI SMI") Cc: Andrew Morton Cc: Ard Biesheuvel Cc: David Gow Cc: Greg Kroah-Hartman Cc: Julius Werner Cc: Petr Mladek Reviewed-by: Evan Green Signed-off-by: Guilherme G. Piccoli Link: https://lore.kernel.org/r/20220909200755.189679-1-gpiccoli@igalia.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/firmware/google/gsmi.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c index adaa492c3d2d..4e2575dfeb90 100644 --- a/drivers/firmware/google/gsmi.c +++ b/drivers/firmware/google/gsmi.c @@ -681,6 +681,15 @@ static struct notifier_block gsmi_die_notifier =3D { static int gsmi_panic_callback(struct notifier_block *nb, unsigned long reason, void *arg) { + + /* + * Panic callbacks are executed with all other CPUs stopped, + * so we must not attempt to spin waiting for gsmi_dev.lock + * to be released. + */ + if (spin_is_locked(&gsmi_dev.lock)) + return NOTIFY_DONE; + gsmi_shutdown_reason(GSMI_SHUTDOWN_PANIC); return NOTIFY_DONE; } --=20 2.35.1