linux-kernel - Re: [PATCH v4] x86/fpu: Fix NULL dereference in avx512

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Message-ID: <6f8307dc-c3ab-4270-8215-c441f0e3f4c4@intel.com>
Date: Mon, 11 Aug 2025 12:22:16 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Sohil Mehta <sohil.mehta@...el.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org
Cc: Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Sean Christopherson <seanjc@...gle.com>,
 Peter Zijlstra <peterz@...radead.org>,
 Vignesh Balasubramanian <vigbalas@....com>,
 Rick Edgecombe <rick.p.edgecombe@...el.com>, Oleg Nesterov
 <oleg@...hat.com>, "Chang S . Bae" <chang.seok.bae@...el.com>,
 Brian Gerst <brgerst@...il.com>, Eric Biggers <ebiggers@...gle.com>,
 Kees Cook <kees@...nel.org>, Chao Gao <chao.gao@...el.com>,
 Christoph Hellwig <hch@...radead.org>, Fushuai Wang <wangfushuai@...du.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] x86/fpu: Fix NULL dereference in avx512_status()

On 8/11/25 11:50, Sohil Mehta wrote:
> From: Fushuai Wang <wangfushuai@...du.com>
> 
> Problem
> -------
> With CONFIG_X86_DEBUG_FPU enabled, reading /proc/[kthread]/arch_status
> causes a kernel NULL pointer dereference.
<snip>

That changelog is getting a bit long-winded and has a lot of extra
information.

The changelog also isn't really converging, so I gave it a go to
rewrite it. Is this missing anything?

https://git.kernel.org/pub/scm/linux/kernel/git/daveh/devel.git/commit/?h=testme&id=d61828dcbcff4ac80b91f5071ba6d21ef6c97347