netdev - Re: NetworkManager fails to start

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Message-ID: <CAHk-=wiucGtZQHpyfm5bK1xp9vepu9dA_OBE-A1-Gr=Neo8b2Q@mail.gmail.com>
Date:   Tue, 15 Jun 2021 09:26:19 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Andrea Righi <andrea.righi@...onical.com>,
        stable <stable@...r.kernel.org>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: NetworkManager fails to start

On Tue, Jun 15, 2021 at 9:21 AM Leon Romanovsky <leon@...nel.org> wrote:
>
> The commit 591a22c14d3f ("proc: Track /proc/$pid/attr/ opener mm_struct")
> that we got in v5.13-rc6 broke our regression to pieces. The NIC interfaces
> fail to start when using NetworkManager.

Does the attached patch fix it?

It just makes the open always succeed, and then the private_data that
the open did (that may or may not then have been filled in) is only
used on write.

               Linus

View attachment "patch.diff" of type "text/x-patch" (629 bytes)