linux-kernel - Re: [PATCH 0/2] maple_tree: Fix mas

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Message-Id: <20230921162748.a85eb5af766e0662e4f22a5e@linux-foundation.org>
Date:   Thu, 21 Sep 2023 16:27:48 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, pedro.falcato@...il.com,
        stable <stable@...nel.org>
Subject: Re: [PATCH 0/2] maple_tree: Fix mas_prev() state regression.

On Thu, 21 Sep 2023 20:23:11 +0100 Matthew Wilcox <willy@...radead.org> wrote:

> > > It isn't clear what are the user-visible effects of this flaw?  Please
> > > send this along and I'll paste it in.
> > 
> > 
> > User may notice that mas_prev() or mas_next() calls that result in going
> > outside of the limit passed to the call will cause incorrect returns on
> > subsequent calls using that maple state, such as mas_find() skipping an
> > entry.
> 
> When Andrew says "User visible" he means "userspace visible".  Not
> "in kernel user visible".  What are the _consequences_.

Thanks ;)

We have a Link:
(https://gist.github.com/heatd/85d2971fae1501b55b6ea401fbbe485b) but it
takes us to the reproducer code.  If it took us to Pedro's initial bug
report then the sun would shine and birds would sing.