netdev - Re: net/core: BUG in copy_net

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Message-ID: <8736pv9kgx.fsf@xmission.com>
Date:   Mon, 14 Jan 2019 12:12:46 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     zzoru <zzoru007@...il.com>, Kirill Tkhai <ktkhai@...tuozzo.com>,
        "davem\@davemloft.net" <davem@...emloft.net>,
        Andrey Vagin <avagin@...tuozzo.com>,
        "dsahern\@gmail.com" <dsahern@...il.com>,
        "nicolas.dichtel\@6wind.com" <nicolas.dichtel@...nd.com>,
        "tyhicks\@canonical.com" <tyhicks@...onical.com>,
        "netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "syzkaller\@googlegroups.com" <syzkaller@...glegroups.com>
Subject: Re: net/core: BUG in copy_net_ns()

Dmitry Vyukov <dvyukov@...gle.com> writes:

> This looks superciliously similar to:
> https://groups.google.com/d/msg/syzkaller-bugs/nFeC8-UG1gg/B6GFaZFrFQAJ
>
> The crux: for the last ~half a year low memory conditions randomly
> corrupt kernel memory with stack overflows.

Does enabling virtually mapped stacks catch those problems?

Eric