From: Eric Dumazet <eric.dumazet@gmail.com>
To: Dmitry Vyukov <dvyukov@google.com>,
Eric Dumazet <eric.dumazet@gmail.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Lameter <cl@linux.com>, Theodore Ts'o <tytso@mit.edu>,
Jan Kara <jack@suse.com>,
linux-ext4@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Pablo Neira Ayuso <pablo@netfilter.org>,
Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>,
Florian Westphal <fw@strlen.de>,
David Miller <davem@davemloft.net>,
NetFilter <netfilter-devel@vger.kernel.org>,
coreteam@netfilter.org,
Network Development <netdev@vger.kernel.org>,
Gerrit Renker <gerrit@erg.abdn.ac.uk>,
dccp@vger.kernel.org, Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Dave Airlie <airlied@linux.ie>,
Subject: Re: SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4 13/17] khwasan: add hooks implementation)
Date: Wed, 1 Aug 2018 04:28:47 -0700 [thread overview]
Message-ID: <cf751136-c459-853a-0210-abf16f54ad17@gmail.com> (raw)
In-Reply-To: <CACT4Y+bLbDunoz+0qB=atbQXJ9Gu3N6+UXPwNnqMbq5RyZu1mQ@mail.gmail.com>
On 08/01/2018 03:34 AM, Dmitry Vyukov wrote:
> On Wed, Aug 1, 2018 at 12:23 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
>> On 08/01/2018 02:03 AM, Andrey Ryabinin wrote:
>>
>>> I can't think of any advantage in not having the constructor.
>>
>> I can't see any advantage adding another indirect call,
>> in RETPOLINE world.
>
> Can you please elaborate what's the problem here?
> If slab ctor call have RETPOLINE, then using ctors more does not
> introduce any security problems and they are not _that_ slow.
They _are_ slow, when we have dozens of them in a code path.
I object "having to add" yet another indirect call, if this can be avoided [*]
If some people want to use ctor, fine, but do not request this.
[*] This can be tricky, but worth the pain.
next prev parent reply other threads:[~2018-08-01 11:28 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-31 17:01 SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4 13/17] khwasan: add hooks implementation) Andrey Ryabinin
2018-07-31 17:09 ` Florian Westphal
2018-07-31 17:32 ` Eric Dumazet
2018-07-31 17:36 ` Christopher Lameter
2018-07-31 17:41 ` Eric Dumazet
2018-07-31 17:51 ` Dmitry Vyukov
2018-07-31 18:16 ` Eric Dumazet
2018-07-31 17:49 ` Linus Torvalds
2018-07-31 18:51 ` Linus Torvalds
2018-08-01 8:46 ` Dmitry Vyukov
2018-08-01 9:10 ` Dmitry Vyukov
2018-08-01 10:35 ` Florian Westphal
2018-08-01 10:41 ` Dmitry Vyukov
2018-08-01 11:40 ` Florian Westphal
2018-08-01 12:38 ` Dmitry Vyukov
2018-08-01 13:46 ` Florian Westphal
2018-08-01 13:52 ` Dmitry Vyukov
2018-08-06 20:20 ` Jan Kara
2018-08-01 9:03 ` Andrey Ryabinin
2018-08-01 10:23 ` Eric Dumazet
2018-08-01 10:34 ` Dmitry Vyukov
2018-08-01 11:28 ` Eric Dumazet [this message]
2018-08-01 11:35 ` Dmitry Vyukov
2018-08-01 15:15 ` Christopher Lameter
2018-08-01 15:37 ` Eric Dumazet
2018-08-01 15:51 ` Misuse of constructors Matthew Wilcox
2018-08-01 15:53 ` SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4 13/17] khwasan: add hooks implementation) Dmitry Vyukov
2018-08-01 16:22 ` Christopher Lameter
2018-08-01 16:25 ` Eric Dumazet
2018-08-01 16:47 ` Dmitry Vyukov
2018-08-01 17:18 ` Eric Dumazet
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=cf751136-c459-853a-0210-abf16f54ad17@gmail.com \
--to=eric.dumazet@gmail.com \
--cc=airlied@linux.ie \
--cc=aryabinin@virtuozzo.com \
--cc=cl@linux.com \
--cc=coreteam@netfilter.org \
--cc=davem@davemloft.net \
--cc=dccp@vger.kernel.org \
--cc=dvyukov@google.com \
--cc=fw@strlen.de \
--cc=gerrit@erg.abdn.ac.uk \
--cc=gregkh@linuxfoundation.org \
--cc=jack@suse.com \
--cc=jani.nikula@linux.intel.com \
--cc=joonas.lahtinen@linux.intel.com \
--cc=kadlec@blackhole.kfki.hu \
--cc=linux-ext4@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=netfilter-devel@vger.kernel.org \
--cc=pablo@netfilter.org \
--cc=rodrigo.vivi@intel.com \
--cc=torvalds@linux-foundation.org \
--cc=tytso@mit.edu \
/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).