linux-kernel - Re: [PATCH RFC v2 2/6] mm/slab: Perform init_on

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Message-Id: <20201203124914.25e63b013e9c69c79d481831@linux-foundation.org>
Date:   Thu, 3 Dec 2020 12:49:14 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     alex.popov@...ux.com
Cc:     Alexander Potapenko <glider@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, Will Deacon <will@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Patrick Bellasi <patrick.bellasi@....com>,
        David Howells <dhowells@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Laura Abbott <labbott@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Micay <danielmicay@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Machek <pavel@...x.de>,
        Valentin Schneider <valentin.schneider@....com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>, notify@...nel.org
Subject: Re: [PATCH RFC v2 2/6] mm/slab: Perform init_on_free earlier

On Thu, 3 Dec 2020 22:50:27 +0300 Alexander Popov <alex.popov@...ux.com> wrote:

> On 30.09.2020 15:50, Alexander Potapenko wrote:
> > On Tue, Sep 29, 2020 at 8:35 PM Alexander Popov <alex.popov@...ux.com> wrote:
> >>
> >> Currently in CONFIG_SLAB init_on_free happens too late, and heap
> >> objects go to the heap quarantine being dirty. Lets move memory
> >> clearing before calling kasan_slab_free() to fix that.
> >>
> >> Signed-off-by: Alexander Popov <alex.popov@...ux.com>
> > Reviewed-by: Alexander Potapenko <glider@...gle.com>
> 
> Hello!
> 
> Can this particular patch be considered for the mainline kernel?

All patches are considered ;) And merged if they're reviewed, tested,
judged useful, etc.

If you think this particular patch should be fast-tracked then please
send it as a non-RFC, standalone patch.  Please also enhance the
changelog so that it actually explains what goes wrong.  Presumably
"objects go to the heap quarantine being dirty" causes some
user-visible problem?  What is that problem?