linux-kernel - Re: [PATCH v2] ucounts: fix counter leak in inc_rlimit_get

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Message-Id: <20241101132135.80642ea36cd094fe83e3d81e@linux-foundation.org>
Date: Fri, 1 Nov 2024 13:21:35 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: linux-kernel@...r.kernel.org, Andrei Vagin <avagin@...gle.com>, Alexey
 Gladkov <legion@...nel.org>, Kees Cook <kees@...nel.org>,
 "Eric W. Biederman" <ebiederm@...ssion.com>, Oleg Nesterov
 <oleg@...hat.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2] ucounts: fix counter leak in
 inc_rlimit_get_ucounts()

On Fri,  1 Nov 2024 19:19:40 +0000 Roman Gushchin <roman.gushchin@...ux.dev> wrote:

> The inc_rlimit_get_ucounts() increments the specified rlimit counter and
> then checks its limit. If the value exceeds the limit, the function
> returns an error without decrementing the counter.

Please (always) provide a description of the userspace visible effects
of the flaw.

> Cc: <stable@...r.kernel.org>

Especially when proposing this!