linux-kernel - Re: [PATCH v3 5/9] selftests/mm: check that FORCE

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2f84676e-e0c5-4355-9276-b275c75938ce@arm.com>
Date: Fri, 23 Jan 2026 09:20:03 +0100
From: Kevin Brodsky <kevin.brodsky@....com>
To: Usama Anjum <usama.anjum@...s.arm.com>, linux-mm@...ck.org,
 linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...nel.org>, Dev Jain <dev.jain@....com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Mark Brown
 <broonie@...nel.org>, Ryan Roberts <ryan.roberts@....com>,
 Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v3 5/9] selftests/mm: check that FORCE_READ() succeeded

On 22/01/2026 18:36, Usama Anjum wrote:
>> +static bool populate_page_checked(char *addr)
>> +{
>> +    bool ret;
>> +
>> +    FORCE_READ(*addr);
>> +    ret = pagemap_is_populated(pagemap_fd, addr);
> Very useful. Maybe extending FORCE_READ can help the entire suite?

I considered it but one needs to have a pagemap fd around, so we'd have
to open it for every test that uses the helper. Maybe such check is not
so essential either (see David's reply).

- Kevin