linux-kernel - Re: [PATCH v2 0/5] mm/hwpoison: Fix regressions in memory failure handling

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]

Message-ID: <20250218131753.GIZ7SIgRZBJokysBeX@fat_crate.local>
Date: Tue, 18 Feb 2025 14:17:53 +0100
From: Borislav Petkov <bp@...en8.de>
To: Shuai Xue <xueshuai@...ux.alibaba.com>
Cc: tony.luck@...el.com, nao.horiguchi@...il.com, tglx@...utronix.de,
	mingo@...hat.com, dave.hansen@...ux.intel.com, x86@...nel.org,
	hpa@...or.com, linmiaohe@...wei.com, akpm@...ux-foundation.org,
	peterz@...radead.org, jpoimboe@...nel.org,
	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, baolin.wang@...ux.alibaba.com,
	tianruidong@...ux.alibaba.com
Subject: Re: [PATCH v2 0/5] mm/hwpoison: Fix regressions in memory failure
 handling

On Tue, Feb 18, 2025 at 09:08:25PM +0800, Shuai Xue wrote:
> Yes, the poison is found on user pages.
> 
> Form commit log, the mechanism is added by Tony and suggested by you.
> https://lkml.kernel.org/r/20210818002942.1607544-3-tony.luck@intel.com

I'm not talking about how it is detected - I'm asking about *what* you're
doing exactly. I want to figure out what and why you're doing what you're
doing.

> It's the same as with real issue. There's no magic to it.

Magic or not, doesn't matter. The only question is whether this can happen in
real life and it is not just you using some tools and "fixing" things that
ain't broke.

> > What do futexes have to do with copying user memory?
> 
> Return -EFAULT to userspace.

This doesn't even begin to answer my question so I'll ask again:

"What do futexes have to do with copying user memory?"

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette