linux-kernel - Re: [PATCH v4 13/36] lib: prevent module unloading if memory is not freed

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Message-ID: <a9ebb623-298d-4acf-bdd5-0025ccb70148@suse.cz>
Date: Mon, 26 Feb 2024 17:58:40 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org
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Subject: Re: [PATCH v4 13/36] lib: prevent module unloading if memory is not
 freed

On 2/21/24 20:40, Suren Baghdasaryan wrote:
> Skip freeing module's data section if there are non-zero allocation tags
> because otherwise, once these allocations are freed, the access to their
> code tag would cause UAF.
> 
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>

I know that module unloading was never considered really supported etc.
But should we printk something so the admin knows why it didn't unload, and
can go check those outstanding allocations?