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From: Jo -l <joel.voyer@gmail.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: dsterba@suse.cz, Joe Perches <joe@perches.com>,
	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>,
	David Rientjes <rientjes@google.com>,
	Michal Hocko <mhocko@suse.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	"Jason A. Donenfeld" <Jason@zx2c4.com>,
	linux-mm@kvack.org, keyrings@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
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	linux-integrity@vger.kernel.org
Subject: Re: [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive()
Date: Wed, 17 Jun 2020 10:03:30 +0200
Message-ID: <29829792-2C3E-44D1-A337-E206F1B6C92A@gmail.com> (raw)
In-Reply-To: <20200617003711.GD8681@bombadil.infradead.org>

Bonjour,
Désolé, aucune traduction possible, 
En français pour comprendre!
Merci
slts

> Le 17 06 2020 à 02:37, Matthew Wilcox <willy@infradead.org> a écrit :
> 
> On Wed, Jun 17, 2020 at 01:01:30AM +0200, David Sterba wrote:
>> On Tue, Jun 16, 2020 at 11:53:50AM -0700, 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?
>> 
>> I'd consider kfree performance critical for cases where it is called
>> under locks. If possible the kfree is moved outside of the critical
>> section, but we have rbtrees or lists that get deleted under locks and
>> restructuring the code to do eg. splice and free it outside of the lock
>> is not always possible.
> 
> Not just performance critical, but correctness critical.  Since kvfree()
> may allocate from the vmalloc allocator, I really think that kvfree()
> should assert that it's !in_atomic().  Otherwise we can get into trouble
> if we end up calling vfree() and have to take the mutex.

Jo-l
joel.voyer@gmail.com




  parent reply index

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 [this message]
2020-06-17 21:31   ` Denis Efremov
2020-06-17 23:12     ` Joe Perches

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