linux-kernel - Re: [PATCH 0/2] Introduce panic function when slub leaks

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: <CAB=+i9TJcnFhwef+efw8yBynZ28M2tWiYvuYS0aVoD4yt_+0Zw@mail.gmail.com>
Date: Wed, 25 Sep 2024 22:18:47 +0900
From: Hyeonggon Yoo <42.hyeyoo@...il.com>
To: Fangzheng Zhang <fangzheng.zhang@...soc.com>
Cc: Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, 
	David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Greg KH <gregkh@...uxfoundation.org>, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, tkjos@...gle.com, 
	Fangzheng Zhang <fangzheng.zhang1003@...il.com>, Yuming Han <yuming.han@...soc.com>
Subject: Re: [PATCH 0/2] Introduce panic function when slub leaks

On Wed, Sep 25, 2024 at 12:23 PM Fangzheng Zhang
<fangzheng.zhang@...soc.com> wrote:
>
> Hi all,

Hi Fangzheng,

> A method to detect slub leaks by monitoring its usage in real time
> on the page allocation path of the slub. When the slub occupancy
> exceeds the user-set value, it is considered that the slub is leaking
> at this time

I'm not sure why this should be a kernel feature. Why not write a user
script that parses
MemTotal: and Slab: part of /proc/meminfo file and generates a log
entry or an alarm?

> and a panic operation will be triggered immediately.

I don't think it would be a good idea to panic unnecessarily.
IMO it is not proper to panic when the kernel can still run.

Any thoughts?

Thanks,
Hyeonggon