linux-kernel - Re: [PATCH 4.19 23/30] x86_64: increase stack size for KASAN

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Message-ID: <953de00c-82df-3ac2-8dd7-a023c511cbb9@virtuozzo.com>
Date:   Thu, 21 Feb 2019 18:00:06 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Qian Cai <cai@....pw>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4.19 23/30] x86_64: increase stack size for KASAN_EXTRA

On 2/21/19 5:36 PM, Greg Kroah-Hartman wrote:
> 4.19-stable review patch.  If anyone has any objections, please let me know.
> 

Drop it please. It increases kernel stack up to 4-order which is above PAGE_ALLOC_COSTLY_ORDER.
This changes behavior of the fork() by making it fail with -ENOMEM due of high memory fragmentation.

The patch that removes KASAN_EXTRA (not in Linus's tree yet) would be a better fix for the problem.