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

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Message-ID: <kjg5lzzgjuls4hmyz3ym3u5ff3pu2ran7e7azabinak6oa6vrh@2vq4e73ftekk>
Date: Tue, 12 Mar 2024 16:07:50 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: Vlastimil Babka <vbabka@...e.cz>, 
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Subject: Re: [PATCH v4 13/36] lib: prevent module unloading if memory is not
 freed

On Tue, Mar 12, 2024 at 11:23:45AM -0700, Luis Chamberlain wrote:
> On Mon, Feb 26, 2024 at 05:58:40PM +0100, Vlastimil Babka wrote:
> > 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.
> 
> If its not supported then we should not have it on modules. Module
> loading and unloading should just work, otherwise then this should not
> work with modules and leave them in a zombie state.

Not have memory allocation profiling on modules?