linux-kernel - Re: configfs: Q: item leak in a failing configfs_attach

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:	Tue, 24 Jun 2008 10:10:51 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Louis Rilling <Louis.Rilling@...labs.com>
Cc:	linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: configfs: Q: item leak in a failing configfs_attach_group()?

On Tue, Jun 24, 2008 at 04:16:49PM +0200, Louis Rilling wrote:
> Hi,
> 
> I'd like an opinion on the following scenario:
> 
> process 1: 					process 2:
> configfs_mkdir("A")
>   attach_group("A")
>     attach_item("A")
>       d_instantiate("A")
>     populate_groups("A")
>       mutex_lock("A")
>       attach_group("A/B")
>         attach_item("A")
>           d_instantiate("A/B")
> 						mkdir("A/B/C")
> 						  do_path_lookup("A/B/C", LOOKUP_PARENT)

					This has to sleep until
					configfs_mkdir("A") finishes.
					It's waiting on A->d_parent's
					i_mutex, which is held by
					sys_mkdirat().

Joel

-- 

"Sometimes one pays most for the things one gets for nothing."
        - Albert Einstein

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
--
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/