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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Tue, 12 Mar 2024 12:56:54 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: Vlastimil Babka <vbabka@...e.cz>, akpm@...ux-foundation.org, kent.overstreet@...ux.dev, 
	mhocko@...e.com, hannes@...xchg.org, roman.gushchin@...ux.dev, 
	mgorman@...e.de, dave@...olabs.net, willy@...radead.org, 
	liam.howlett@...cle.com, penguin-kernel@...ove.sakura.ne.jp, corbet@....net, 
	void@...ifault.com, peterz@...radead.org, juri.lelli@...hat.com, 
	catalin.marinas@....com, will@...nel.org, arnd@...db.de, tglx@...utronix.de, 
	mingo@...hat.com, dave.hansen@...ux.intel.com, x86@...nel.org, 
	peterx@...hat.com, david@...hat.com, axboe@...nel.dk, masahiroy@...nel.org, 
	nathan@...nel.org, dennis@...nel.org, tj@...nel.org, muchun.song@...ux.dev, 
	rppt@...nel.org, paulmck@...nel.org, pasha.tatashin@...een.com, 
	yosryahmed@...gle.com, yuzhao@...gle.com, dhowells@...hat.com, 
	hughd@...gle.com, andreyknvl@...il.com, keescook@...omium.org, 
	ndesaulniers@...gle.com, vvvvvv@...gle.com, gregkh@...uxfoundation.org, 
	ebiggers@...gle.com, ytcoode@...il.com, vincent.guittot@...aro.org, 
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, 
	bristot@...hat.com, vschneid@...hat.com, cl@...ux.com, penberg@...nel.org, 
	iamjoonsoo.kim@....com, 42.hyeyoo@...il.com, glider@...gle.com, 
	elver@...gle.com, dvyukov@...gle.com, shakeelb@...gle.com, 
	songmuchun@...edance.com, jbaron@...mai.com, rientjes@...gle.com, 
	minchan@...gle.com, kaleshsingh@...gle.com, kernel-team@...roid.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	iommu@...ts.linux.dev, linux-arch@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, 
	linux-modules@...r.kernel.org, kasan-dev@...glegroups.com, 
	cgroups@...r.kernel.org
Subject: Re: [PATCH v4 13/36] lib: prevent module unloading if memory is not freed

On Tue, Mar 12, 2024 at 11:23 AM Luis Chamberlain <mcgrof@...nel.org> 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.

I replied on the v5 thread here:
https://lore.kernel.org/all/20240306182440.2003814-13-surenb@google.com/
 Let's continue the discussion in that thread. Thanks!

>
>   Luis