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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63CC1CCA481 for ; Thu, 30 Jun 2022 13:49:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235482AbiF3NtO (ORCPT ); Thu, 30 Jun 2022 09:49:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235392AbiF3Nso (ORCPT ); Thu, 30 Jun 2022 09:48:44 -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 CBA4713F5C; Thu, 30 Jun 2022 06:48:35 -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 564CB61FFB; Thu, 30 Jun 2022 13:48:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36DA4C3411E; Thu, 30 Jun 2022 13:48:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656596914; bh=UqT7Ezn9pWtS5CRV1aEcCh3rXLPAeHPdmaWs4yzft/k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ArQP9zZu3hIqkyl69OvTsVBDSxRWZ7o+tr6n5OG83dvhbOf/hhIVfzEiA03cSHaaT NPNkdrn803Ms0wTxhIGCbYDtT+9hnq9y3JnLhG8yDR0pS8TvYiJo/2qrcmxNyetaR5 Wgvu8kC5LD1EFmJkoIDigal5/Wnv1I0mHwctA2Oc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephen Rothwell , Masahiro Yamada , Oleksandr Tyshchenko , Stefano Stabellini , Juergen Gross Subject: [PATCH 4.9 26/29] xen: unexport __init-annotated xen_xlate_map_ballooned_pages() Date: Thu, 30 Jun 2022 15:46:26 +0200 Message-Id: <20220630133231.972554082@linuxfoundation.org> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220630133231.200642128@linuxfoundation.org> References: <20220630133231.200642128@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Masahiro Yamada commit dbac14a5a05ff8e1ce7c0da0e1f520ce39ec62ea upstream. EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it has been broken for a decade. Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds. There are two ways to fix it: - Remove __init - Remove EXPORT_SYMBOL I chose the latter for this case because none of the in-tree call-sites (arch/arm/xen/enlighten.c, arch/x86/xen/grant-table.c) is compiled as modular. Fixes: 243848fc018c ("xen/grant-table: Move xlated_setup_gnttab_pages to common place") Reported-by: Stephen Rothwell Signed-off-by: Masahiro Yamada Reviewed-by: Oleksandr Tyshchenko Acked-by: Stefano Stabellini Link: https://lore.kernel.org/r/20220606045920.4161881-1-masahiroy@kernel.org Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman --- drivers/xen/xlate_mmu.c | 1 - 1 file changed, 1 deletion(-) --- a/drivers/xen/xlate_mmu.c +++ b/drivers/xen/xlate_mmu.c @@ -262,4 +262,3 @@ int __init xen_xlate_map_ballooned_pages return 0; } -EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);