linux-kernel - Re: SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4 13/17] khwasan: add hooks implementation)

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Message-ID: <20180801134628.ueyzwg2gszrvk2hc@breakpoint.cc>
Date:   Wed, 1 Aug 2018 15:46:28 +0200
From:   Florian Westphal <fw@...len.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Florian Westphal <fw@...len.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.com>,
        linux-ext4@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        David Miller <davem@...emloft.net>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        coreteam@...filter.org,
        Network Development <netdev@...r.kernel.org>,
        Gerrit Renker <gerrit@....abdn.ac.uk>, dccp@...r.kernel.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Dave Airlie <airlied@...ux.ie>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ursula Braun <ubraun@...ux.ibm.com>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4
 13/17] khwasan: add hooks implementation)

Dmitry Vyukov <dvyukov@...gle.com> wrote:
> If that scenario is possible that a fix would be to make

Looks possible.

> __nf_conntrack_find_get ever return NULL iff it got NULL from
> ____nf_conntrack_find (not if any of the checks has failed).

I don't see why we need to restart on nf_ct_is_dying(), but other
than that this seems ok.