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 88486EB64DD for ; Tue, 1 Aug 2023 09:24:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232646AbjHAJYK (ORCPT ); Tue, 1 Aug 2023 05:24:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232892AbjHAJXw (ORCPT ); Tue, 1 Aug 2023 05:23:52 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B48A51FC8 for ; Tue, 1 Aug 2023 02:22:26 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4FE6E614FB for ; Tue, 1 Aug 2023 09:22:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33EF9C433C7; Tue, 1 Aug 2023 09:22:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690881745; bh=0CIPnZUJovU51Gqd30qHdxrNUi1xVl7XJ+Ub+cRCCnI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qS52JrTAmc4v5tXDIadv97ckm4e5INjfFueCmxrwtx4AQkj6Ob7dAV3NeacKWeT0a AFdyoGjGd+2v1kFQSvpeWnQGcaHRxbQtLK0efBiVzhAYrX+RtdIHRCao1X8QnYOU0u NJXri5+5HMY79O6ncJZ1HwE4ZEHnFZeVv9sl9arM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Janosch Frank , Claudio Imbrenda , Sasha Levin Subject: [PATCH 5.15 002/155] KVM: s390: pv: fix index value of replaced ASCE Date: Tue, 1 Aug 2023 11:18:34 +0200 Message-ID: <20230801091910.268021277@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801091910.165050260@linuxfoundation.org> References: <20230801091910.165050260@linuxfoundation.org> User-Agent: quilt/0.67 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: Claudio Imbrenda [ Upstream commit c2fceb59bbda16468bda82b002383bff59de89ab ] The index field of the struct page corresponding to a guest ASCE should be 0. When replacing the ASCE in s390_replace_asce(), the index of the new ASCE should also be set to 0. Having the wrong index might lead to the wrong addresses being passed around when notifying pte invalidations, and eventually to validity intercepts (VM crash) if the prefix gets unmapped and the notifier gets called with the wrong address. Reviewed-by: Philippe Mathieu-Daudé Fixes: faa2f72cb356 ("KVM: s390: pv: leak the topmost page table when destroy fails") Reviewed-by: Janosch Frank Signed-off-by: Claudio Imbrenda Message-ID: <20230705111937.33472-3-imbrenda@linux.ibm.com> Signed-off-by: Sasha Levin --- arch/s390/mm/gmap.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index ff40bf92db43a..a2c872de29a66 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -2791,6 +2791,7 @@ int s390_replace_asce(struct gmap *gmap) page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER); if (!page) return -ENOMEM; + page->index = 0; table = page_to_virt(page); memcpy(table, gmap->table, 1UL << (CRST_ALLOC_ORDER + PAGE_SHIFT)); -- 2.39.2