linux-kernel - bug in migrate page

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: <1187748489.8474.21.camel@sli10-conroe.sh.intel.com>
Date:	Wed, 22 Aug 2007 10:08:09 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	kamezawa.hiroyu@...fujitsu.com, clameter@....com
Subject: bug in migrate page

commit dc386d4d1e98bb39fb967ee156cd456c802fc692 adds rcu_read_lock, but
some routines in the lock range might sleep (like lock_buffer,
aops->writepage), I saw a 'sleep in atomic' warning. It appears the
patch has several versions before. Doing rcu_read_lock in PageAnon
sounds break the case of PageAnon(page) && PageSwapCache(page),
as .writepage might be called. The dummy anon patch maybe is ok.

Thanks,
Shaohua
-
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/