linux-kernel - hmm pud-entry callback locking?

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-next>] [day] [month] [year] [list]

Message-ID: <4d25d751-d03a-29c6-950b-cafe8d201784@shipmail.org>
Date:   Sat, 5 Oct 2019 14:29:40 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>
Subject: hmm pud-entry callback locking?

Hi, Jerome,

I was asked by Kirill to try to unify the pagewalk pud_entry and 
pmd_entry callbacks. The only user of the pagewalk pud-entry is 
currently hmm.

But the pagewalk code call pud_entry only for huge puds with the 
page-table lock held, whereas the hmm callback appears to assume it gets 
called unconditionally without the page-table lock held?

Could you shed some light into this?

Thanks,
Thomas