linux-kernel - Re: [PATCH 0/2] apparmor unaligned memory fixes

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Message-ID: <bc21bee14ca44077ae9323bfc251ad12390fa841.camel@physik.fu-berlin.de>
Date: Tue, 18 Nov 2025 10:04:58 +0100
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: deller@...nel.org, linux-kernel@...r.kernel.org,
 apparmor@...ts.ubuntu.com,  John Johansen <john.johansen@...onical.com>,
 linux-security-module@...r.kernel.org
Cc: Helge Deller <deller@....de>
Subject: Re: [PATCH 0/2] apparmor unaligned memory fixes

Hi Helge,

On Sat, 2025-05-31 at 17:08 +0200, deller@...nel.org wrote:
> From: Helge Deller <deller@....de>
> 
> Two patches which fix unaligned memory accesses in apparmor.
> Both triggered on the parisc platform, which is much more
> memory alignment sensitive and will report violations.
> Please check and apply.
> 
> Helge
> 
> Helge Deller (2):
>   apparmor: Fix 8-byte alignment for initial dfa blob streams
>   apparmor: Fix unaligned memory accesses in KUnit test
> 
>  security/apparmor/lsm.c                | 4 ++--
>  security/apparmor/policy_unpack_test.c | 6 ++++--
>  2 files changed, 6 insertions(+), 4 deletions(-)

Thanks for looking into this!

Unfortunately, the problem still persists on SPARC even with v6.18-rc6:

[   76.209476] Kernel unaligned access at TPC[8dabfc] aa_dfa_unpack+0x3c/0x6e0
[   76.301115] Kernel unaligned access at TPC[8dac0c] aa_dfa_unpack+0x4c/0x6e0
[   76.392697] Kernel unaligned access at TPC[8dacf0] aa_dfa_unpack+0x130/0x6e0
[   76.485440] Kernel unaligned access at TPC[8dacf0] aa_dfa_unpack+0x130/0x6e0
[   76.578179] Kernel unaligned access at TPC[8dacf0] aa_dfa_unpack+0x130/0x6e0

I have documented the problem here [1].

So, I suspect that your fix is incomplete.

Adrian

> [1] https://github.com/sparclinux/issues/issues/30

-- 
 .''`.  John Paul Adrian Glaubitz
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