linux-kernel - Re: [PATCH v2 3/5] memfd: improve userspace warnings for missing exec-related flags

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Message-ID: <8734zs7ft6.fsf@oldenburg.str.redhat.com>
Date:   Tue, 05 Sep 2023 18:20:05 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Damian Tometzki <dtometzki@...oraproject.org>,
        Aleksa Sarai <cyphar@...har.com>,
        Shuah Khan <shuah@...nel.org>, Jeff Xu <jeffxu@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Daniel Verkamp <dverkamp@...omium.org>,
        Christian Brauner <brauner@...nel.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        stable@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 3/5] memfd: improve userspace warnings for missing
 exec-related flags

* Andrew Morton:

> OK, thanks, I'll revert this.  Spamming everyone even harder isn't a
> good way to get developers to fix their stuff.

Is this really buggy userspace?  Are future kernels going to require
some of these flags?

That's going to break lots of applications which use memfd_create to
enable run-time code generation on locked-down systems because it looked
like a stable interface (“don't break userspace” and all that).

Thanks,
Florian