From: Joe Perches <joe@perches.com>
To: Denis Efremov <efremov@ispras.ru>,
Waiman Long <longman@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
David Howells <dhowells@redhat.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
David Sterba <dsterba@suse.cz>,
"Jason A . Donenfeld" <Jason@zx2c4.com>,
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
Subject: Re: [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive()
Date: Wed, 17 Jun 2020 16:12:06 -0700 [thread overview]
Message-ID: <38c5745d14cff75fe264a3bc61d19fd837baf7ad.camel@perches.com> (raw)
In-Reply-To: <17e4fede-bab0-d93c-6964-69decc889d7d@ispras.ru>
On Thu, 2020-06-18 at 00:31 +0300, Denis Efremov wrote:
>
> On 6/16/20 9:53 PM, Joe Perches wrote:
> > On Mon, 2020-06-15 at 21:57 -0400, Waiman Long wrote:
> > > v4:
> > > - Break out the memzero_explicit() change as suggested by Dan Carpenter
> > > so that it can be backported to stable.
> > > - Drop the "crypto: Remove unnecessary memzero_explicit()" patch for
> > > now as there can be a bit more discussion on what is best. It will be
> > > introduced as a separate patch later on after this one is merged.
> >
> > To this larger audience and last week without reply:
> > https://lore.kernel.org/lkml/573b3fbd5927c643920e1364230c296b23e7584d.camel@perches.com/
> >
> > Are there _any_ fastpath uses of kfree or vfree?
> >
> > Many patches have been posted recently to fix mispairings
> > of specific types of alloc and free functions.
>
> I've prepared a coccinelle script to highlight these mispairings in a function
> a couple of days ago: https://lkml.org/lkml/2020/6/5/953
> I've listed all the fixes in the commit message.
>
> Not so many mispairings actually, and most of them are harmless like:
> kmalloc(E) -> kvfree(E)
>
> However, coccinelle script can't detect cross-functions mispairings, i.e.
> allocation in one function, free in another funtion.
Hey Denis, thanks for those patches.
If possible, it's probably better to not require these pairings
and use a single standard kfree/free function.
Given the existing ifs in kfree in slab/slob/slub, it seems
likely that adding a few more wouldn't have much impact.
prev parent reply other threads:[~2020-06-17 23:49 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 1:57 Waiman Long
2020-06-16 1:57 ` [PATCH v4 1/3] mm/slab: Use memzero_explicit() in kzfree() Waiman Long
2020-06-16 3:30 ` Eric Biggers
2020-06-16 13:05 ` Waiman Long
2020-06-16 15:46 ` David Howells
2020-06-16 6:42 ` Michal Hocko
2020-06-16 9:08 ` Dan Carpenter
2020-06-16 1:57 ` [PATCH v4 2/3] mm, treewide: Rename kzfree() to kfree_sensitive() Waiman Long
2020-06-16 14:26 ` Dan Carpenter
2020-06-16 15:05 ` Waiman Long
2020-06-16 1:57 ` [PATCH v4 3/3] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info() Waiman Long
2020-06-16 14:48 ` David Sterba
2020-06-16 15:05 ` Waiman Long
2020-06-16 18:53 ` [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive() Joe Perches
2020-06-16 19:43 ` Waiman Long
2020-06-16 19:46 ` Jason A. Donenfeld
2020-06-16 20:01 ` Waiman Long
2020-06-16 21:14 ` Matthew Wilcox
2020-06-16 23:01 ` David Sterba
2020-06-17 0:37 ` Matthew Wilcox
2020-06-17 7:12 ` Michal Hocko
2020-06-17 11:08 ` Matthew Wilcox
2020-06-17 11:31 ` Michal Hocko
2020-06-17 12:23 ` Matthew Wilcox
2020-06-17 12:55 ` Michal Hocko
2020-06-17 8:03 ` Jo -l
2020-06-17 21:31 ` Denis Efremov
2020-06-17 23:12 ` Joe Perches [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=38c5745d14cff75fe264a3bc61d19fd837baf7ad.camel@perches.com \
--to=joe@perches.com \
--cc=Jason@zx2c4.com \
--cc=akpm@linux-foundation.org \
--cc=dan.carpenter@oracle.com \
--cc=devel@driverdev.osuosl.org \
--cc=dhowells@redhat.com \
--cc=dsterba@suse.cz \
--cc=ecryptfs@vger.kernel.org \
--cc=efremov@ispras.ru \
--cc=hannes@cmpxchg.org \
--cc=jarkko.sakkinen@linux.intel.com \
--cc=jmorris@namei.org \
--cc=kasan-dev@googlegroups.com \
--cc=keyrings@vger.kernel.org \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-bluetooth@vger.kernel.org \
--cc=linux-btrfs@vger.kernel.org \
--cc=linux-cifs@vger.kernel.org \
--cc=linux-crypto@vger.kernel.org \
--cc=linux-fscrypt@vger.kernel.org \
--cc=linux-integrity@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=linux-mm@kvack.org \
--cc=linux-nfs@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linux-ppp@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=linux-sctp@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=linux-stm32@st-md-mailman.stormreply.com \
--cc=linux-wireless@vger.kernel.org \
--cc=linux-wpan@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=longman@redhat.com \
--cc=mhocko@suse.com \
--cc=netdev@vger.kernel.org \
--cc=rientjes@google.com \
--cc=serge@hallyn.com \
--cc=target-devel@vger.kernel.org \
--cc=tipc-discussion@lists.sourceforge.net \
--cc=torvalds@linux-foundation.org \
--cc=virtualization@lists.linux-foundation.org \
--cc=willy@infradead.org \
--cc=wireguard@lists.zx2c4.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).