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=-8.3 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_SANE_1 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 C39F7C433E0 for ; Tue, 16 Jun 2020 15:05:48 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9D22A208B3 for ; Tue, 16 Jun 2020 15:05:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="W1DF+DQB"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FAbEstMs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9D22A208B3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Cc:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=4wJGqyTauOrXPVovLNiHOqiFOtY0WAbp794rnQLwao4=; b=W1DF+DQBZwDjlHSnux39LfONY aNkmQ+VxpdM2tYM/nHinNQcl35dQgd3ChVPUjHtdNgrurGtqhfe/ZHqwfgFWtqgYM7U6RvD7UhTQ3 NIABWD5+pWVhXyo7Bx2oaYuFeef5SYTwZKckuBndBRzQ6NDOZji3vgGhINUjYBGiyGeMbi+Kzk5pn EbMuVEJRFiW1D+5c1r7AfKYSnzLwxi5tpKWekfWgC55w0uoZf/hTjmLmUBGjxv9pAayhlwPH6laoT wijUZte20Dt7fkPhsrwoJgDy+L1fPLouL9Jd5VZZZ8FCcnHpj8Bzv02miMStTAkSk83Dtzkobnh68 KNSyIKdMg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jlD9i-0001Fg-UY; Tue, 16 Jun 2020 15:05:42 +0000 Received: from us-smtp-1.mimecast.com ([207.211.31.81] helo=us-smtp-delivery-1.mimecast.com) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jlD9e-0001BU-F8 for linux-mediatek@lists.infradead.org; Tue, 16 Jun 2020 15:05:40 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592319937; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rXbjvJPZU9GzTq8LOO4SZ69J1AJAOxGiWdFnkvpgDCI=; b=FAbEstMs3xNUM3t1yfX5UtZTgC3pSh4qVfuzlekNVI4lvRatJ7Fo3pHxaXB2bIaLlrABo1 1S4v+sg1QE/6izZf2ZcYzbaRykbu8FofG5u4fG+7DobGPkPpmFEK4Xwkmq66sWDLQBvUF5 WVOV1UJcYpPt93PA4AkREzK5JBm45YY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-347-rhm5WjahMFKJc8Xm5_1I2g-1; Tue, 16 Jun 2020 11:05:32 -0400 X-MC-Unique: rhm5WjahMFKJc8Xm5_1I2g-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6B20C100CCC9; Tue, 16 Jun 2020 15:05:27 +0000 (UTC) Received: from llong.remote.csb (ovpn-114-156.rdu2.redhat.com [10.10.114.156]) by smtp.corp.redhat.com (Postfix) with ESMTP id 897CF7890A; Tue, 16 Jun 2020 15:05:22 +0000 (UTC) Subject: Re: [PATCH v4 3/3] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info() To: dsterba@suse.cz, Andrew Morton , David Howells , Jarkko Sakkinen , James Morris , "Serge E. Hallyn" , Linus Torvalds , Joe Perches , Matthew Wilcox , David Rientjes , Michal Hocko , Johannes Weiner , Dan Carpenter , "Jason A . Donenfeld" , linux-mm@kvack.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-pm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-amlogic@lists.infradead.org, linux-mediatek@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-ppp@vger.kernel.org, wireguard@lists.zx2c4.com, linux-wireless@vger.kernel.org, devel@driverdev.osuosl.org, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-fscrypt@vger.kernel.org, ecryptfs@vger.kernel.org, kasan-dev@googlegroups.com, linux-bluetooth@vger.kernel.org, linux-wpan@vger.kernel.org, linux-sctp@vger.kernel.org, linux-nfs@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org References: <20200616015718.7812-1-longman@redhat.com> <20200616015718.7812-4-longman@redhat.com> <20200616144804.GD27795@twin.jikos.cz> From: Waiman Long Organization: Red Hat Message-ID: <75152002-5f02-04b6-a811-29ef79961e0b@redhat.com> Date: Tue, 16 Jun 2020 11:05:22 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200616144804.GD27795@twin.jikos.cz> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200616_080538_594437_17778667 X-CRM114-Status: GOOD ( 18.69 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 6/16/20 10:48 AM, David Sterba wrote: > On Mon, Jun 15, 2020 at 09:57:18PM -0400, Waiman Long wrote: >> In btrfs_ioctl_get_subvol_info(), there is a classic case where kzalloc() >> was incorrectly paired with kzfree(). According to David Sterba, there >> isn't any sensitive information in the subvol_info that needs to be >> cleared before freeing. So kfree_sensitive() isn't really needed, >> use kfree() instead. >> >> Reported-by: David Sterba >> Signed-off-by: Waiman Long >> --- >> fs/btrfs/ioctl.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c >> index f1dd9e4271e9..e8f7c5f00894 100644 >> --- a/fs/btrfs/ioctl.c >> +++ b/fs/btrfs/ioctl.c >> @@ -2692,7 +2692,7 @@ static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) >> btrfs_put_root(root); >> out_free: >> btrfs_free_path(path); >> - kfree_sensitive(subvol_info); >> + kfree(subvol_info); > I would rather merge a patch doing to kzfree -> kfree instead of doing > the middle step to switch it to kfree_sensitive. If it would help > integration of your patchset I can push it to the next rc so there are > no kzfree left in the btrfs code. Treewide change like that can take > time so it would be one less problem to care about for you. > Sure, I will move it forward in the patch series. Thanks, Longman _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek