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From: Richard Weinberger <richard@nod.at>
To: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: Eric Biggers <ebiggers@kernel.org>, Theodore Ts'o <tytso@mit.edu>,
	Amir Goldstein <amir73il@gmail.com>,
	Miklos Szeredi <miklos@szeredi.hu>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	linux-fscrypt@vger.kernel.org,
	overlayfs <linux-unionfs@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Paul Lawrence <paullawrence@google.com>
Subject: Re: overlayfs vs. fscrypt
Date: Wed, 13 Mar 2019 17:24:10 +0100	[thread overview]
Message-ID: <2287057.GpIlh1E3ca@blindfold> (raw)
In-Reply-To: <1552493632.3022.17.camel@HansenPartnership.com>

Am Mittwoch, 13. März 2019, 17:13:52 CET schrieb James Bottomley:
> > What do you mean by "containment breaches by other tenants"?  Note
> > that while the key is added, fscrypt doesn't prevent access to the
> > encrypted files.
> 
> You mean it's not multiuser safe?  Even if user a owns the key they add
> user b can still see the decrypted contents?

If user a reads the file before, yes. Then user b sees it because the contents
got cached.
That's why you need still make sure that your access control is sane.

Thanks,
//richard



  reply	other threads:[~2019-03-13 16:24 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-13 12:31 overlayfs vs. fscrypt Richard Weinberger
2019-03-13 12:36 ` Miklos Szeredi
2019-03-13 12:47   ` Richard Weinberger
2019-03-13 12:58     ` Miklos Szeredi
2019-03-13 13:00       ` Richard Weinberger
2019-03-13 13:24         ` Miklos Szeredi
2019-03-13 13:32           ` Richard Weinberger
2019-03-13 14:26             ` Amir Goldstein
2019-03-13 15:16               ` Theodore Ts'o
2019-03-13 15:30                 ` Richard Weinberger
2019-03-13 15:36                 ` James Bottomley
2019-03-13 15:51                   ` Eric Biggers
2019-03-13 16:13                     ` James Bottomley
2019-03-13 16:24                       ` Richard Weinberger [this message]
2019-03-13 16:44                   ` Theodore Ts'o
2019-03-13 17:45                     ` James Bottomley
2019-03-13 18:58                       ` Theodore Ts'o
2019-03-13 19:17                         ` James Bottomley
2019-03-13 19:57                           ` Eric Biggers
2019-03-13 20:06                             ` James Bottomley
2019-03-13 20:25                               ` Eric Biggers
2019-03-13 21:04                                 ` James Bottomley
2019-03-13 22:13                                   ` Eric Biggers
2019-03-13 22:29                                     ` James Bottomley
2019-03-13 22:58                                       ` Eric Biggers
2019-03-13 16:06                 ` Al Viro
2019-03-13 16:44                   ` Eric Biggers
2019-03-13 19:19                     ` Al Viro
2019-03-13 19:43                       ` Eric Biggers
2019-03-13 15:30               ` Eric Biggers
2019-03-13 20:33               ` Richard Weinberger
2019-03-13 22:26                 ` Eric Biggers
2019-03-13 22:42                   ` Richard Weinberger
2019-03-14  7:34                     ` Miklos Szeredi
2019-03-14 17:15                       ` [RFC] fscrypt_key_required mount option Richard Weinberger
2019-03-14 17:15                         ` [PATCH 1/4] fscrypt: Implement FS_CFLG_OWN_D_OPS Richard Weinberger
2019-03-14 17:15                         ` [PATCH 2/4] fscrypt: Export fscrypt_d_ops Richard Weinberger
2019-03-14 17:15                         ` [PATCH 3/4] ubifs: Simplify fscrypt_get_encryption_info() error handling Richard Weinberger
2019-03-14 17:15                         ` [PATCH 4/4] ubifs: Implement new mount option, fscrypt_key_required Richard Weinberger
2019-03-14 17:49                           ` Eric Biggers
2019-03-14 20:54                             ` Richard Weinberger
2019-03-14 23:07                               ` Theodore Ts'o
2019-03-15  7:48                                 ` Richard Weinberger
2019-03-15 13:51                                   ` Theodore Ts'o
2019-03-15 13:59                                     ` Richard Weinberger
2019-03-14 23:15                           ` James Bottomley
2019-03-14 23:42                             ` Theodore Ts'o
2019-03-14 23:55                               ` James Bottomley
2019-03-13 15:01           ` overlayfs vs. fscrypt Eric Biggers
2019-03-13 16:11             ` Al Viro
2019-03-13 16:33               ` Eric Biggers

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