From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-111.freemail.mail.aliyun.com (out30-111.freemail.mail.aliyun.com [115.124.30.111]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4B7D2127E12 for ; Wed, 15 May 2024 13:29:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.111 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715779801; cv=none; b=qmUWHH1QL+LY+vveBiSzL6YTYbPVEP8xLE9VKHp8Ct1zQvyiFE4GY/tkzZQXo/fe8LhCNRGojNXOJ34ZFb1znQO93tpwXoLNSqHhpKWb3kpwbUeKzY8EJQ76MIv2+zxTABh7aHQ1vean1+T4Saz3ihwrXDJ3gjVRW61RZ/9gD6c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715779801; c=relaxed/simple; bh=mkKjpPpuGEd4/WEi+kqlcv0kfuYm/u5RzqJD/2y2c7s=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=u6etoMGRXtajYNYnaj66rROBNvlzpfreBK3K4tcGM2I5hJhdpdKbYtahQ9iDZiyFlZ3Aa1CukhgckwBkQoqVYuoW7m6UtWEGG5cB6f0cw2Dp9KsZxHYex3Ouc7kkSpH+Qwmw0yJ4Nvr254h7y87MxRP9x756AfGrnuPLW49YMvo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=kZC3RbZF; arc=none smtp.client-ip=115.124.30.111 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="kZC3RbZF" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1715779791; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=YOi4tDk8CK2U3Nzvqq2F2lyNfJlKybMBPqcVB0ycB68=; b=kZC3RbZFslVMWf3Ld/HrBcoWKi8PLU5Vy5R7wo56KPUQA/zP7z6wQSPKRM7hwNuCivYlDOE6fNQsAjMLFG8FZebZSxs8/SOZ6NrbyxT5b/sGnGn7RCoVpLKM0vloGyibp3xrOL2IYcG4V6JtjxBAWewD4pdUL81UArqkoGACtQc= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R151e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037067110;MF=mengferry@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0W6YDIG7_1715779788; Received: from j66c13357.sqa.eu95.tbsite.net(mailfrom:mengferry@linux.alibaba.com fp:SMTPD_---0W6YDIG7_1715779788) by smtp.aliyun-inc.com; Wed, 15 May 2024 21:29:50 +0800 From: Ferry Meng To: Mark Fasheh , Joel Becker , Joseph Qi , ocfs2-devel@lists.linux.dev Cc: linux-kernel@vger.kernel.org, Ferry Meng Subject: [PATCH 2/2] ocfs2: strict bound check before memcmp in ocfs2_xattr_find_entry() Date: Wed, 15 May 2024 21:29:34 +0800 Message-Id: <20240515132934.69511-3-mengferry@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240515132934.69511-1-mengferry@linux.alibaba.com> References: <20240515132934.69511-1-mengferry@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit xattr in ocfs2 maybe not INLINE, but saved with additional space requested. It's better to check if the memory is out of bound before memcmp, although this possibility mainly comes from custom poisonous images. Signed-off-by: Ferry Meng --- fs/ocfs2/xattr.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c index 37be4a286faf..4ceb0cb4cb71 100644 --- a/fs/ocfs2/xattr.c +++ b/fs/ocfs2/xattr.c @@ -1083,10 +1083,15 @@ static int ocfs2_xattr_find_entry(struct inode *inode, void *end, cmp = name_index - ocfs2_xattr_get_type(entry); if (!cmp) cmp = name_len - entry->xe_name_len; - if (!cmp) + if (!cmp) { + if ((xs->base + le16_to_cpu(entry->xe_name_offset) + name_len) > end) { + ocfs2_error(inode->i_sb, "corrupted xattr entries"); + return -EFSCORRUPTED; + } cmp = memcmp(name, (xs->base + le16_to_cpu(entry->xe_name_offset)), name_len); + } if (cmp == 0) break; entry += 1; -- 2.32.0.3.g01195cf9f