linux-kernel - Re: [PATCH v2] Fix UCOUNT_RLIMIT

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Message-ID: <CAHk-=whdEAjawjUSeJ+DV25ARdAhbiW_HZM65ZgJx7M94rvLkg@mail.gmail.com>
Date:   Thu, 8 Jul 2021 11:44:05 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Alexey Gladkov <legion@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux.dev>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v2] Fix UCOUNT_RLIMIT_SIGPENDING counter leak

On Thu, Jul 8, 2021 at 3:34 AM Alexey Gladkov <legion@...nel.org> wrote:
>
> We must properly handle an errors when we increase the rlimit counter
> and the ucounts reference counter. We have to this with RCU protection
> to prevent possible use-after-free that could occur due to concurrent
> put_cred_rcu().

Thanks, LGTM. Applied,

            Linus