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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,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 3BE36C004C9 for ; Tue, 7 May 2019 06:00:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0E935205C9 for ; Tue, 7 May 2019 06:00:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557208824; bh=hBXc9T7g7moBL7FY6MAsud/UaYKdYSvABg4/xdbFYrU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=j/lebMznjJdGHaXCXTSvbpnYt5AlzjjViQ3cEORnsRhoe39arcZLErBcgnoNQbsQO mttFhpC/fPQOfN1RgEYhgSeZM870m4ha9v0/138P+kT8ceVgU5aHw/V0zKdWadd0My DchRqcSazxI+kIwieRT/76pddD2noGri8lvaxfbw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728244AbfEGGAX (ORCPT ); Tue, 7 May 2019 02:00:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:56346 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728058AbfEGFgT (ORCPT ); Tue, 7 May 2019 01:36:19 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CE2C120C01; Tue, 7 May 2019 05:36:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207378; bh=hBXc9T7g7moBL7FY6MAsud/UaYKdYSvABg4/xdbFYrU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FqY9Die9YDgr1BSpEgLN2rrJisEtgB7ZKMSffg0q8vFJJrMAethJPzA2coR0OMl/F QEHps3lHx5Ql/s8tnSHa0mdzoHZRmHGykSkneEGhEcHUBjZA8lr0ap5b9Zw2MXWlhx zPnA2HIBZAOJ14DoRewc9CxEeHiEDChlj3csaBIY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Li RongQing , Liang ZhiCheng , Ira Weiny , Jeff Moyer , Dan Williams , Sasha Levin , linux-nvdimm@lists.01.org Subject: [PATCH AUTOSEL 4.19 17/81] libnvdimm/pmem: fix a possible OOB access when read and write pmem Date: Tue, 7 May 2019 01:34:48 -0400 Message-Id: <20190507053554.30848-17-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190507053554.30848-1-sashal@kernel.org> References: <20190507053554.30848-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Li RongQing [ Upstream commit 9dc6488e84b0f64df17672271664752488cd6a25 ] If offset is not zero and length is bigger than PAGE_SIZE, this will cause to out of boundary access to a page memory Fixes: 98cc093cba1e ("block, THP: make block_device_operations.rw_page support THP") Co-developed-by: Liang ZhiCheng Signed-off-by: Liang ZhiCheng Signed-off-by: Li RongQing Reviewed-by: Ira Weiny Reviewed-by: Jeff Moyer Signed-off-by: Dan Williams Signed-off-by: Sasha Levin --- drivers/nvdimm/pmem.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 1d432c5ed275..cff027fc2676 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -113,13 +113,13 @@ static void write_pmem(void *pmem_addr, struct page *page, while (len) { mem = kmap_atomic(page); - chunk = min_t(unsigned int, len, PAGE_SIZE); + chunk = min_t(unsigned int, len, PAGE_SIZE - off); memcpy_flushcache(pmem_addr, mem + off, chunk); kunmap_atomic(mem); len -= chunk; off = 0; page++; - pmem_addr += PAGE_SIZE; + pmem_addr += chunk; } } @@ -132,7 +132,7 @@ static blk_status_t read_pmem(struct page *page, unsigned int off, while (len) { mem = kmap_atomic(page); - chunk = min_t(unsigned int, len, PAGE_SIZE); + chunk = min_t(unsigned int, len, PAGE_SIZE - off); rem = memcpy_mcsafe(mem + off, pmem_addr, chunk); kunmap_atomic(mem); if (rem) @@ -140,7 +140,7 @@ static blk_status_t read_pmem(struct page *page, unsigned int off, len -= chunk; off = 0; page++; - pmem_addr += PAGE_SIZE; + pmem_addr += chunk; } return BLK_STS_OK; } -- 2.20.1