From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp2130.oracle.com ([156.151.31.86]:55738 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728585AbgFOSJm (ORCPT ); Mon, 15 Jun 2020 14:09:42 -0400 Date: Mon, 15 Jun 2020 21:07:53 +0300 From: Dan Carpenter 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> Sender: linux-s390-owner@vger.kernel.org List-ID: To: Waiman Long Cc: Andrew Morton , David Howells , Jarkko Sakkinen , James Morris , "Serge E. Hallyn" , Linus Torvalds , Joe Perches , Matthew Wilcox , David Rientjes , samba-technical@lists.samba.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, linux-sctp@vger.kernel.org, target-devel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, devel@driverdev.osuosl.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, x86@kernel.org, kasan-dev@googlegroups.com, cocci@systeme.lip6.fr, linux-wpan@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-crypto@vger.kernel.org, linux-pm@vger.kernel.org, ecryptfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.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, wireguard@lists.zx2c4.com, linux-ppp@vger.kernel.org, linux-integrity@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-btrfs@vger.kernel.org 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