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  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:   Wed,  6 Oct 2021 10:18:35 +0800
From:   Rongwei Wang <rongwei.wang@...ux.alibaba.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, willy@...radead.org, song@...nel.org,
        william.kucharski@...cle.com, hughd@...gle.com
Subject: [PATCH v3 v3 0/2] mm, thp: fix file-backed THP race in collapse_file and truncate pagecache

Hi,
We found two bugs related to file-backed THP in our cases, recently.
The two bugs rough description as following:

1. in truncate_inode_pages_range, subpage(s) of file-backed THP can be
revealed by find_get_entry.

2. 'collapse_file' miss the pages which in writeback but no private.
This situation will be triggered in XFS when block size is set to
PAGESIZE.

These two patches mainly fix the above mentioned bugs, and have been
tested in latest branch.

Changelog:

v2 -> v3:
- Patch "mm, thp: lock filemap when truncating page cache"
add filemap_invalidate_{un}lock before and after calling truncate_pagecache (Suggested by Song Liu and Matthew).

v1 -> v2:
- Patch "mm, thp: check page mapping when truncating page cache"
move the check of page mapping to behind lock_page.
- Patch "mm, thp: bail out early in collapse_file for writeback page"
check the writeback flag before taking page lock (Suggested by Yang Shi).

v1 link:
https://patchwork.kernel.org/project/linux-mm/cover/20210906121200.57905-1-rongwei.wang@linux.alibaba.com/
v2 link:
https://patchwork.kernel.org/project/linux-mm/patch/20210922070645.47345-2-rongwei.wang@linux.alibaba.com/

Rongwei Wang (2):
  mm, thp: lock filemap when truncating page cache
  mm, thp: bail out early in collapse_file for writeback page

 fs/open.c       | 5 ++++-
 mm/khugepaged.c | 7 ++++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

-- 
2.27.0

Powered by blists - more mailing lists