linux-ext4 - Re: [PATCH 0/2] ext4, mm: improve partial inode eof zeroing

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: <173099237654.321265.9905047947203401102.b4-ty@mit.edu>
Date: Thu,  7 Nov 2024 10:12:55 -0500
From: "Theodore Ts'o" <tytso@....edu>
To: linux-ext4@...r.kernel.org, linux-mm@...ck.org,
        Brian Foster <bfoster@...hat.com>
Cc: "Theodore Ts'o" <tytso@....edu>, linux-fsdevel@...r.kernel.org,
        willy@...radead.org
Subject: Re: [PATCH 0/2] ext4, mm: improve partial inode eof zeroing


On Thu, 19 Sep 2024 12:07:39 -0400, Brian Foster wrote:
> I've been poking around at testing zeroing behavior after a couple
> recent enhancements to iomap_zero_range() and fsx[1]. Running [1] on
> ext4 has uncovered a couple issues that I think share responsibility
> between the fs and pagecache.
> 
> The details are in the commit logs, but patch 1 updates ext4 to do
> partial eof block zeroing in more cases and patch 2 tweaks
> pagecache_isize_extended() to do eof folio zeroing similar to as is done
> during writeback (i.e., ext4_bio_write_folio(),
> iomap_writepage_handle_eof(), etc.). These kind of overlap, but the fs
> changes handle the case of a block straddling eof (so we're writing to
> disk in that case) and the pagecache changes handle the case of a folio
> straddling eof that might be at least partially hole backed (i.e.
> sub-page block sizes, so we're just clearing pagecache).
> 
> [...]

Applied, thanks!

[1/2] ext4: partial zero eof block on unaligned inode size extension
      commit: 462a214e71f3fbc40d28f0a00fe6f0d4c4041c98
[2/2] mm: zero range of eof folio exposed by inode size extension
      commit: faf7bba6b84981443773952289571e5ebeda1767

Best regards,
-- 
Theodore Ts'o <tytso@....edu>