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Mon, 15 Jun 2020 18:08:31 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 05FHwvkZ051587; Mon, 15 Jun 2020 18:08:30 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 31p6de1e1n-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 15 Jun 2020 18:08:30 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 05FI8G7g031730; Mon, 15 Jun 2020 18:08:17 GMT Received: from kadam (/41.57.98.10) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 15 Jun 2020 11:08:15 -0700 Date: Mon, 15 Jun 2020 21:07:53 +0300 From: Dan Carpenter To: Waiman Long Subject: Re: [PATCH 1/2] mm, treewide: Rename kzfree() to kfree_sensitive() Message-ID: <20200615180753.GJ4151@kadam> References: <20200413211550.8307-1-longman@redhat.com> <20200413211550.8307-2-longman@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200413211550.8307-2-longman@redhat.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9653 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 adultscore=0 bulkscore=0 phishscore=0 malwarescore=0 spamscore=0 mlxlogscore=930 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006150134 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9653 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 impostorscore=0 clxscore=1011 mlxscore=0 mlxlogscore=944 priorityscore=1501 phishscore=0 malwarescore=0 suspectscore=2 spamscore=0 cotscore=-2147483648 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006150135 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-cifs@vger.kernel.org, linux-wireless@vger.kernel.org, Jarkko Sakkinen , virtualization@lists.linux-foundation.org, David Howells , linux-mm@kvack.org, linux-sctp@vger.kernel.org, target-devel@vger.kernel.org, kasan-dev@googlegroups.com, cocci@systeme.lip6.fr, devel@driverdev.osuosl.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, x86@kernel.org, James Morris , Matthew Wilcox , linux-stm32@st-md-mailman.stormreply.com, intel-wired-lan@lists.osuosl.org, David Rientjes , "Serge E. Hallyn" , linux-pm@vger.kernel.org, ecryptfs@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-fscrypt@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-btrfs@vger.kernel.org, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-nfs@vger.kernel.org, Linus Torvalds , samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-crypto@vger.kernel.org, netdev@vger.kernel.org, Joe Perches , Andrew Morton , linux-wpan@vger.kernel.org, wireguard@lists.zx2c4.com, linux-ppp@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Apr 13, 2020 at 05:15:49PM -0400, Waiman Long wrote: > diff --git a/mm/slab_common.c b/mm/slab_common.c > index 23c7500eea7d..c08bc7eb20bd 100644 > --- a/mm/slab_common.c > +++ b/mm/slab_common.c > @@ -1707,17 +1707,17 @@ void *krealloc(const void *p, size_t new_size, gfp_t flags) > EXPORT_SYMBOL(krealloc); > > /** > - * kzfree - like kfree but zero memory > + * kfree_sensitive - Clear sensitive information in memory before freeing > * @p: object to free memory of > * > * The memory of the object @p points to is zeroed before freed. > - * If @p is %NULL, kzfree() does nothing. > + * If @p is %NULL, kfree_sensitive() does nothing. > * > * Note: this function zeroes the whole allocated buffer which can be a good > * deal bigger than the requested buffer size passed to kmalloc(). So be > * careful when using this function in performance sensitive code. > */ > -void kzfree(const void *p) > +void kfree_sensitive(const void *p) > { > size_t ks; > void *mem = (void *)p; > @@ -1725,10 +1725,10 @@ void kzfree(const void *p) > if (unlikely(ZERO_OR_NULL_PTR(mem))) > return; > ks = ksize(mem); > - memset(mem, 0, ks); > + memzero_explicit(mem, ks); ^^^^^^^^^^^^^^^^^^^^^^^^^ This is an unrelated bug fix. It really needs to be pulled into a separate patch by itself and back ported to stable kernels. > kfree(mem); > } > -EXPORT_SYMBOL(kzfree); > +EXPORT_SYMBOL(kfree_sensitive); > > /** > * ksize - get the actual amount of memory allocated for a given object regards, dan carpenter