linux-kernel - Re: [RFC][PATCH] ecryptfs: Allow only one instance per lower path

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:	Mon, 3 Aug 2015 20:31:57 +0200
From:	Richard Weinberger <richard@....at>
To:	Tyler Hicks <tyhicks@...onical.com>
Cc:	ecryptfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [RFC][PATCH] ecryptfs: Allow only one instance per lower path

Tyler,

Am 03.08.2015 um 07:27 schrieb Tyler Hicks:
>> So ecryptfs definitely supports mounting the same lower path multiple times?
>> What is the benefit of that behavior?
> 
> No, it doesn't support that in a way that provides consistency among all
> of the eCryptfs mounts.

Okay, then I'd argument to give my patch a try although it is not the solution
to the problem I've reported. :-)
If you don't mind I'll resend with a proper changelog.

> However, multiple mounts on the same lower path is not the cause of this
> bug. The real issue is a stale dcache entry when the lower filesystem
> has been modified without eCryptfs' knowing. I can trigger the same
> warnings with only a single eCryptfs mount.

Interesting, that renders the whole issue into a user triggerable kernel
bug. :-(

Thanks,
//richard
--
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/