linux-kernel - Re: [PATCH v3 18/35] mm: create new codetag references during page splitting

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]

Date: Fri, 16 Feb 2024 15:33:24 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org
Cc: kent.overstreet@...ux.dev, mhocko@...e.com, hannes@...xchg.org,
 roman.gushchin@...ux.dev, mgorman@...e.de, dave@...olabs.net,
 willy@...radead.org, liam.howlett@...cle.com, corbet@....net,
 void@...ifault.com, peterz@...radead.org, juri.lelli@...hat.com,
 catalin.marinas@....com, will@...nel.org, arnd@...db.de, tglx@...utronix.de,
 mingo@...hat.com, dave.hansen@...ux.intel.com, x86@...nel.org,
 peterx@...hat.com, david@...hat.com, axboe@...nel.dk, mcgrof@...nel.org,
 masahiroy@...nel.org, nathan@...nel.org, dennis@...nel.org, tj@...nel.org,
 muchun.song@...ux.dev, rppt@...nel.org, paulmck@...nel.org,
 pasha.tatashin@...een.com, yosryahmed@...gle.com, yuzhao@...gle.com,
 dhowells@...hat.com, hughd@...gle.com, andreyknvl@...il.com,
 keescook@...omium.org, ndesaulniers@...gle.com, vvvvvv@...gle.com,
 gregkh@...uxfoundation.org, ebiggers@...gle.com, ytcoode@...il.com,
 vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org,
 bsegall@...gle.com, bristot@...hat.com, vschneid@...hat.com, cl@...ux.com,
 penberg@...nel.org, iamjoonsoo.kim@....com, 42.hyeyoo@...il.com,
 glider@...gle.com, elver@...gle.com, dvyukov@...gle.com,
 shakeelb@...gle.com, songmuchun@...edance.com, jbaron@...mai.com,
 rientjes@...gle.com, minchan@...gle.com, kaleshsingh@...gle.com,
 kernel-team@...roid.com, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
 linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-mm@...ck.org, linux-modules@...r.kernel.org,
 kasan-dev@...glegroups.com, cgroups@...r.kernel.org
Subject: Re: [PATCH v3 18/35] mm: create new codetag references during page
 splitting

On 2/12/24 22:39, Suren Baghdasaryan wrote:
> When a high-order page is split into smaller ones, each newly split
> page should get its codetag. The original codetag is reused for these
> pages but it's recorded as 0-byte allocation because original codetag
> already accounts for the original high-order allocated page.

Wouldn't it be possible to adjust the original's accounted size and
redistribute to the split pages for more accuracy?