linux-kernel - Re: [BUG REPORT] [mm-hotplug, aio] aio ring

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

Date:	Fri, 30 Nov 2012 00:00:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Lin Feng <linfeng@...fujitsu.com>, viro@...iv.linux.org.uk,
	bcrl@...ck.org, mhocko@...e.cz, hughd@...gle.com, cl@...ux.com,
	mgorman@...e.de, minchan@...nel.org,
	isimatu.yasuaki@...fujitsu.com, laijs@...fujitsu.com,
	wency@...fujitsu.com, tangchen@...fujitsu.com,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG REPORT] [mm-hotplug, aio] aio ring_pages can't be offlined

On Fri, 30 Nov 2012 16:13:16 +0900 Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> > What about futexes?
> >
> 
> IIUC, futex's key is now a pair of (mm,address) or (inode, pgoff).
> Then, get_user_page() in futex.c will release the page by put_page().
> 'struct page' is just touched by get_futex_key() to obtain page->mapping info.

Ah yes, that page is unpinned before syscall return.

	grep -rl get_user_pages .

Gad.

These should be audited.  The great majority will be simple and OK,
but drivers/media, drivers/infiniband and net/rds could be problematic.
--
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/