linux-kernel - Re: [PATCH 0/3] Add PUD and kernel PTE level pagetable account

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: <d2d58cc2-7e6d-aa2d-3096-a500ce321494@intel.com>
Date:   Wed, 6 Jul 2022 08:48:07 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>,
        akpm@...ux-foundation.org
Cc:     rppt@...ux.ibm.com, willy@...radead.org, will@...nel.org,
        aneesh.kumar@...ux.ibm.com, npiggin@...il.com,
        peterz@...radead.org, catalin.marinas@....com,
        chenhuacai@...nel.org, kernel@...0n.name,
        tsbogend@...ha.franken.de, dave.hansen@...ux.intel.com,
        luto@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, arnd@...db.de, guoren@...nel.org,
        monstr@...str.eu, jonas@...thpole.se,
        stefan.kristiansson@...nalahti.fi, shorne@...il.com,
        x86@...nel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
        linux-mips@...r.kernel.org, linux-csky@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Add PUD and kernel PTE level pagetable account

On 7/6/22 01:59, Baolin Wang wrote:
> Now we will miss to account the PUD level pagetable and kernel PTE level
> pagetable, as well as missing to set the PG_table flags for these pagetable
> pages, which will get an inaccurate pagetable accounting, and miss
> PageTable() validation in some cases. So this patch set introduces new
> helpers to help to account PUD and kernel PTE pagetable pages.

Could you explain the motivation for this series a bit more?  Is there a
real-world problem that this fixes?