linux-kernel - [PATCH 0/8] mm/swap: fix some rare issues in swap subsystem

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: <000501cf1b46$b899edb0$29cdc910$%yang@samsung.com>
Date:	Mon, 27 Jan 2014 18:00:03 +0800
From:	Weijie Yang <weijie.yang@...sung.com>
To:	hughd@...gle.com
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Minchan Kim' <minchan@...nel.org>, shli@...nel.org,
	'Bob Liu' <bob.liu@...cle.com>, weijie.yang.kh@...il.com,
	'Seth Jennings' <sjennings@...iantweb.net>,
	'Linux-MM' <linux-mm@...ck.org>,
	'linux-kernel' <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org, 'Heesub Shin' <heesub.shin@...sung.com>,
	mguzik@...hat.com
Subject: [PATCH 0/8] mm/swap: fix some rare issues in swap subsystem

This patch series focus on some tiny and rare issues in swap subsystem.
These issues happen rarely, so it is just for the correctness of the code.

It firstly add some comments to try to make swap flag/lock usage in
swapfile.c more clear and readable,
and fix some rare issues in swap subsystem that cause race condition among
swapon, swapoff and frontswap_register_ops.
and fix some not race issues.

Please see individual patch for details, any complaint and suggestion
are welcome.

Regards

patch 1/8: add some comments for swap flag/lock usage

patch 2/8: fix race on swap_info reuse between swapoff and swapon
	This patch has been in akpm -mm tree, however I improve it according
	to Heesub Shin and Mateusz Guzik's suggestion. So, that old patch need
	to be dropped.

patch 3/8: prevent concurrent swapon on the same S_ISBLK blockdev

patch 4/8: fix race among frontswap_register_ops, swapoff and swapon

patch 5/8: drop useless and bug frontswap_shrink codes

patch 6/8: remove swap_lock to simplify si_swapinfo()

patch 7/8: check swapfile blocksize greater than PAGE_SIZE

patch 8/8: add missing handle on a dup-store failure

 include/linux/blkdev.h    |    4 +++-
 include/linux/frontswap.h |    2 --
 include/linux/swapfile.h  |    4 +---
 mm/frontswap.c            |  127 +++++++------------------------------------------------------------------------------------------------------------------------
 mm/page_io.c              |    2 ++
 mm/rmap.c                 |    2 +-
 mm/swapfile.c             |  138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------
 7 files changed, 112 insertions(+), 167 deletions(-)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/