linux-kernel - Re: [RFC PATCH 4/7] static_call: fix broken static_call

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Date:   Tue, 9 Nov 2021 19:56:07 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jason Baron <jbaron@...mai.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mark Rutland <mark.rutland@....com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC PATCH 4/7] static_call: fix broken static_call_query() for
 non-exported keys

On Tue, Nov 09, 2021 at 05:45:46PM +0100, Ard Biesheuvel wrote:
> static_call_query() accesses the func member of the static call key
> directly, which means that it is broken for cases where it is used from
> a module and the key resides elsewhere and is not exported.
> 

Arguably when the module can't change the value, it shouldn't be having
any interest in obtaining said value either.

I really think you're exporting too much. Modules aren't good, they
deserve to suffer.