From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755030AbbIOJMz (ORCPT ); Tue, 15 Sep 2015 05:12:55 -0400 Received: from mail.kernel.org ([198.145.29.136]:53846 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754983AbbIOJMw (ORCPT ); Tue, 15 Sep 2015 05:12:52 -0400 From: lizf@kernel.org To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Benjamin Randazzo , NeilBrown , Zefan Li Subject: [PATCH 3.4 134/146] md: use kzalloc() when bitmap is disabled Date: Tue, 15 Sep 2015 17:04:09 +0800 Message-Id: <1442307861-32031-134-git-send-email-lizf@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1442307787-31952-1-git-send-email-lizf@kernel.org> References: <1442307787-31952-1-git-send-email-lizf@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Benjamin Randazzo 3.4.109-rc1 review patch. If anyone has any objections, please let me know. ------------------ commit b6878d9e03043695dbf3fa1caa6dfc09db225b16 upstream. In drivers/md/md.c get_bitmap_file() uses kmalloc() for creating a mdu_bitmap_file_t called "file". 5769 file = kmalloc(sizeof(*file), GFP_NOIO); 5770 if (!file) 5771 return -ENOMEM; This structure is copied to user space at the end of the function. 5786 if (err == 0 && 5787 copy_to_user(arg, file, sizeof(*file))) 5788 err = -EFAULT But if bitmap is disabled only the first byte of "file" is initialized with zero, so it's possible to read some bytes (up to 4095) of kernel space memory from user space. This is an information leak. 5775 /* bitmap disabled, zero the first byte and copy out */ 5776 if (!mddev->bitmap_info.file) 5777 file->pathname[0] = '\0'; Signed-off-by: Benjamin Randazzo Signed-off-by: NeilBrown [lizf: Backported to 3.4: fix both branches] Signed-off-by: Zefan Li --- drivers/md/md.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 17e2f52..83dba06 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5431,9 +5431,9 @@ static int get_bitmap_file(struct mddev * mddev, void __user * arg) int err = -ENOMEM; if (md_allow_write(mddev)) - file = kmalloc(sizeof(*file), GFP_NOIO); + file = kzalloc(sizeof(*file), GFP_NOIO); else - file = kmalloc(sizeof(*file), GFP_KERNEL); + file = kzalloc(sizeof(*file), GFP_KERNEL); if (!file) goto out; -- 1.9.1