linux-kernel - Re: [PATCH 6/8] modules: switch to execmem API for remapping as RW and restoring ROX

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Message-ID: <d48193a3-65fe-4aa9-98f6-dd5869bd9127@citrix.com>
Date: Fri, 3 Jan 2025 02:06:10 +0000
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: lorenzo.stoakes@...cle.com
Cc: akpm@...ux-foundation.org, anton.ivanov@...bridgegreys.com, bp@...en8.de,
 brendan.higgins@...ux.dev, da.gomez@...sung.com, danielt@...nel.org,
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 joe.lawrence@...hat.com, johannes@...solutions.net, jpoimboe@...nel.org,
 kgdb-bugreport@...ts.sourceforge.net, kirill.shutemov@...ux.intel.com,
 kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
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 luto@...nel.org, mark.rutland@....com, mbenes@...e.cz, mcgrof@...nel.org,
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 shuah@...nel.org, song@...nel.org, tglx@...utronix.de, x86@...nel.org,
 Juergen Gross <jgross@...e.com>,
 Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
Subject: Re: [PATCH 6/8] modules: switch to execmem API for remapping as RW
 and restoring ROX

> Hi Mike,
>
> This commit is making my intel box not boot in mm-unstable :>) I bisected it to
> this commit.

For what it's worth, we've found the same under Xen too.

There's one concrete bug in the series, failing to cope with the absence
of superpages (fix in
https://lore.kernel.org/xen-devel/6bb03333-74ca-4c2c-85a8-72549b85a5b4@suse.com/
but not formally posted yet AFAICT).

The rest of the thread then found a crash looking to be the same as
reported here, but you've made better progress narrowing it down than we
have.

~Andrew