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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 72D6FC3276C for ; Thu, 2 Jan 2020 22:11:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4743E21835 for ; Thu, 2 Jan 2020 22:11:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578003084; bh=JrOqbF6YDPDMz5f+9FqIzqyRoV/6CWGrgcynEh5Fehw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NKnrcMToR5cWKQjv9c+mPRdvjiwHUpm/UOYHQ1qVvKSrn25sPQl9zeytUTXTl8CeS BrmlkRc++uAER+sEcMLlSWwoXr8GIp/F0SBISsfCiXtG6E3dG9+OUBj6HsLdGiUkbt myheEh6YpEB08k8uw7o7+l6OUmHYvEKQcGRroCL8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726373AbgABWLX (ORCPT ); Thu, 2 Jan 2020 17:11:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:49344 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726194AbgABWLV (ORCPT ); Thu, 2 Jan 2020 17:11:21 -0500 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 91B6C21D7D; Thu, 2 Jan 2020 22:11:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578003081; bh=JrOqbF6YDPDMz5f+9FqIzqyRoV/6CWGrgcynEh5Fehw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VcP2dqXUsRr1nwcT+0xQFzQJVtZcwfw9kXjj9LkELOmqXOqfnRFdTbqKlKnIRq9zv Fe0L84dxFlgsUEhprjDbK29+87tE4EH0y45ZGbS464FA0CR39B7j/i1oD7paMmoWCo 96a4WisZnpSQG3UF0SMo1+OixahlrViy3EBSzcB0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vaibhav Jain , "Aneesh Kumar K.V" , Michael Ellerman , Sasha Levin Subject: [PATCH 5.4 012/191] powerpc/papr_scm: Fix an off-by-one check in papr_scm_meta_{get, set} Date: Thu, 2 Jan 2020 23:04:54 +0100 Message-Id: <20200102215831.033993270@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102215829.911231638@linuxfoundation.org> References: <20200102215829.911231638@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vaibhav Jain [ Upstream commit 612ee81b9461475b5a5612c2e8d71559dd3c7920 ] A validation check to prevent out of bounds read/write inside functions papr_scm_meta_{get,set}() is off-by-one that prevent reads and writes to the last byte of the label area. This bug manifests as a failure to probe a dimm when libnvdimm is unable to read the entire config-area as advertised by ND_CMD_GET_CONFIG_SIZE. This usually happens when there are large number of namespaces created in the region backed by the dimm and the label-index spans max possible config-area. An error of the form below usually reported in the kernel logs: [ 255.293912] nvdimm: probe of nmem0 failed with error -22 The patch fixes these validation checks there by letting libnvdimm access the entire config-area. Fixes: 53e80bd042773('powerpc/nvdimm: Add support for multibyte read/write for metadata') Signed-off-by: Vaibhav Jain Reviewed-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190927062002.3169-1-vaibhav@linux.ibm.com Signed-off-by: Sasha Levin --- arch/powerpc/platforms/pseries/papr_scm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index 61883291defc..ee07d0718bf1 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -152,7 +152,7 @@ static int papr_scm_meta_get(struct papr_scm_priv *p, int len, read; int64_t ret; - if ((hdr->in_offset + hdr->in_length) >= p->metadata_size) + if ((hdr->in_offset + hdr->in_length) > p->metadata_size) return -EINVAL; for (len = hdr->in_length; len; len -= read) { @@ -206,7 +206,7 @@ static int papr_scm_meta_set(struct papr_scm_priv *p, __be64 data_be; int64_t ret; - if ((hdr->in_offset + hdr->in_length) >= p->metadata_size) + if ((hdr->in_offset + hdr->in_length) > p->metadata_size) return -EINVAL; for (len = hdr->in_length; len; len -= wrote) { -- 2.20.1