netdev - Re: [PATCH bpf-next 2/7] set_memory: introduce set_memory_[ro|x]

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Message-ID: <20211116080051.GU174703@worktop.programming.kicks-ass.net>
Date:   Tue, 16 Nov 2021 09:00:51 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     x86@...nel.org, bpf@...r.kernel.org, netdev@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kernel-team@...com
Subject: Re: [PATCH bpf-next 2/7] set_memory: introduce
 set_memory_[ro|x]_noalias

On Mon, Nov 15, 2021 at 11:13:42PM -0800, Song Liu wrote:
> These allow setting ro/x for module_alloc() mapping, while leave the
> linear mapping rw/nx.

This needs a very strong rationale for *why*. How does this not
trivially circumvent W^X ?