linux-kernel - Re: [PATCH v2 8/9] selftests/mm: Skip map

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] [day] [month] [year] [list]

Message-ID: <CA+i-1C3qSSgxJKREyVxFqCwZxGfZ+2962P5fKMATYFLGFb7fWw@mail.gmail.com>
Date: Mon, 24 Feb 2025 11:25:20 +0100
From: Brendan Jackman <jackmanb@...gle.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Shuah Khan <shuah@...nel.org>
Cc: Dev Jain <dev.jain@....com>, linux-mm@...ck.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 8/9] selftests/mm: Skip map_populate on weird filesystems

On Fri, 21 Feb 2025 at 19:26, Brendan Jackman <jackmanb@...gle.com> wrote:
>
> It seems that 9pfs does not allow truncating unlinked files, Mark Brown
> has noted that NFS may also behave this way.

I have not investigated at all but I _think_ over the weekend I saw
ftruncate() failure on a QEMU guest where /tmp was tmpfs.

Most likely explanation is user probably error (like /tmp wasn't
actually tmpfs or the tmpfile() did not actually come from /tmp). But
still, maybe just waving my hands and going "buggy filesystem, ignore"
wasn't so smart. I should actually understand the problem before
switching off tests.

So, I think this and the other "ignore on weird filesystem" patch 9/9
should be ignored for the moment.