linux-hardening - Re: [RFC PATCH v2 5/8] mseal: Check seal flag for munmap(2)

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: <CAHk-=wgwdHzOY_mT3y9gDHSMXZ8Xb5OYrK40-u9uRXLv25fNPA@mail.gmail.com>
Date: Tue, 17 Oct 2023 09:54:35 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: jeffxu@...omium.org
Cc: akpm@...ux-foundation.org, keescook@...omium.org, jannh@...gle.com, 
	sroettger@...gle.com, willy@...radead.org, gregkh@...uxfoundation.org, 
	jeffxu@...gle.com, jorgelo@...omium.org, groeck@...omium.org, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-mm@...ck.org, surenb@...gle.com, alex.sierra@....com, 
	apopple@...dia.com, aneesh.kumar@...ux.ibm.com, axelrasmussen@...gle.com, 
	ben@...adent.org.uk, catalin.marinas@....com, david@...hat.com, 
	dwmw@...zon.co.uk, ying.huang@...el.com, hughd@...gle.com, joey.gouly@....com, 
	corbet@....net, wangkefeng.wang@...wei.com, Liam.Howlett@...cle.com, 
	lstoakes@...il.com, mawupeng1@...wei.com, linmiaohe@...wei.com, 
	namit@...are.com, peterx@...hat.com, peterz@...radead.org, 
	ryan.roberts@....com, shr@...kernel.io, vbabka@...e.cz, 
	xiujianfeng@...wei.com, yu.ma@...el.com, zhangpeng362@...wei.com, 
	dave.hansen@...el.com, luto@...nel.org, linux-hardening@...r.kernel.org
Subject: Re: [RFC PATCH v2 5/8] mseal: Check seal flag for munmap(2)

On Tue, 17 Oct 2023 at 02:08, <jeffxu@...omium.org> wrote:
>
> Of all the call paths that call into do_vmi_munmap(),
> this is the only place where checkSeals = MM_SEAL_MUNMAP.
> The rest has checkSeals = 0.

Why?

None of this makes sense.

So you say "we can't munmap in this *one* place, but all others ignore
the sealing".

Crazy.

             Linus