From: Matthew Wilcox <willy@infradead.org>
To: Daniel Micay <danielmicay@gmail.com>
Cc: Jann Horn <jannh@google.com>,
linux-mm@kvack.org,
Kernel Hardening <kernel-hardening@lists.openwall.com>,
kernel list <linux-kernel@vger.kernel.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [RFC] Warn the user when they could overflow mapcount
Date: Thu, 8 Feb 2018 10:56:48 -0800 [thread overview]
Message-ID: <20180208185648.GB9524@bombadil.infradead.org> (raw)
In-Reply-To: <CA+DvKQLHDR0s=6r4uiHL8kw2_PnfJcwYfPxgQOmuLbc=5k39+g@mail.gmail.com>
On Thu, Feb 08, 2018 at 01:05:33PM -0500, Daniel Micay wrote:
> The standard map_max_count / pid_max are very low and there are many
> situations where either or both need to be raised.
[snip good reasons]
> I do think the default value in the documentation should be fixed but
> if there's a clear problem with raising these it really needs to be
> fixed. Google either of the sysctl names and look at all the people
> running into issues and needing to raise them. It's only going to
> become more common to raise these with people trying to use lots of
> fine-grained sandboxing. Process-per-request is back in style.
So we should make the count saturate instead, then? That's going to
be interesting.
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next prev parent reply other threads:[~2018-02-08 18:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-08 2:11 [RFC] Warn the user when they could overflow mapcount Matthew Wilcox
2018-02-08 2:56 ` Jann Horn
2018-02-08 4:04 ` Matthew Wilcox
2018-02-08 17:58 ` valdis.kletnieks
2018-02-08 18:05 ` Daniel Micay
2018-02-08 18:56 ` Matthew Wilcox [this message]
2018-02-08 19:33 ` Daniel Micay
2018-02-08 19:42 ` Matthew Wilcox
2018-02-08 19:48 ` Daniel Micay
2018-02-08 20:21 ` Matthew Wilcox
2018-02-08 21:37 ` [RFC] Limit mappings to ten per page per process Matthew Wilcox
2018-02-09 4:26 ` Kirill A. Shutemov
2018-02-14 13:51 ` Matthew Wilcox
2018-02-14 14:05 ` Kirill A. Shutemov
2018-02-09 1:47 ` [RFC] Warn the user when they could overflow mapcount Daniel Micay
2018-02-08 3:18 ` Tobin C. Harding
2018-02-08 4:06 ` Matthew Wilcox
2018-03-02 21:26 ` [RFC] Handle mapcount overflows Matthew Wilcox
2018-03-02 22:03 ` Matthew Wilcox
2019-05-01 14:41 ` Jann Horn
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