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From: Eric Biggers <ebiggers@kernel.org>
To: Jeff Layton <jlayton@kernel.org>
Cc: Xiubo Li <xiubli@redhat.com>,
	ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-fscrypt@vger.kernel.org, dhowells@redhat.com,
	lhenriques@suse.de, khiremat@redhat.com
Subject: Re: [RFC PATCH v8 09/24] ceph: add ability to set fscrypt_auth via setattr
Date: Tue, 31 Aug 2021 10:54:46 -0700	[thread overview]
Message-ID: <YS5s5mYZtc3r+K/E@sol.localdomain> (raw)
In-Reply-To: <7f231e95bd397394eba44c3e346524bac44a069b.camel@kernel.org>

On Tue, Aug 31, 2021 at 09:50:32AM -0400, Jeff Layton wrote:
> > > > > +		/* It should never be re-set once set */
> > > > > +		WARN_ON_ONCE(ci->fscrypt_auth);
> > > > > +
> > > > Maybe this should return -EEXIST if already set ?
> > > > 
> > > I don't know. In general, once the context is set on an inode, we
> > > shouldn't ever reset it. That said, I think we might need to allow
> > > admins to override an existing context if it's corrupted.
> > > 
> > > So, that's the rationale for the WARN_ON_ONCE. The admins should never
> > > do this under normal circumstances but they do have the ability to
> > > change it if needed (and we'll see a warning in the logs in that case).
> > 
> > I may miss some code in the fs/crypto/ layer.
> > 
> > I readed that once the directory/file has set the policy context, it 
> > will just return 0 if the new one matches the existence, if not match it 
> > will return -EEXIST, or will try to call ceph layer to set it.
> > 
> > So once this is set, my understanding is that it shouldn't be here ?
> > 
> 
> Where did you read that? If we have documented semantics we need to
> follow here, then we should change it to comply with them.
> 

That is how FS_IOC_SET_ENCRYPTION_POLICY behaves, but the check for an existing
policy already happens in fscrypt_ioctl_set_policy(), so ->set_context doesn't
need to worry about it.

- Eric

  reply	other threads:[~2021-08-31 17:54 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26 16:19 [RFC PATCH v8 00/24] ceph+fscrypt: context, filename and symlink support Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 01/24] vfs: export new_inode_pseudo Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 02/24] fscrypt: export fscrypt_base64url_encode and fscrypt_base64url_decode Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 03/24] fscrypt: export fscrypt_fname_encrypt and fscrypt_fname_encrypted_size Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 04/24] fscrypt: add fscrypt_context_for_new_inode Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 05/24] ceph: preallocate inode for ops that may create one Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 06/24] ceph: parse new fscrypt_auth and fscrypt_file fields in inode traces Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 07/24] ceph: add fscrypt_* handling to caps.c Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 08/24] ceph: crypto context handling for ceph Jeff Layton
2021-08-26 16:19 ` [RFC PATCH v8 09/24] ceph: add ability to set fscrypt_auth via setattr Jeff Layton
2021-08-31  5:06   ` Xiubo Li
2021-08-31 12:43     ` Jeff Layton
2021-08-31 13:22       ` Xiubo Li
2021-08-31 13:50         ` Jeff Layton
2021-08-31 17:54           ` Eric Biggers [this message]
2021-09-01  0:53             ` Xiubo Li
2021-09-01  1:13           ` Xiubo Li
2021-09-01 12:02             ` Jeff Layton
2021-09-02  1:54               ` Xiubo Li
2021-08-26 16:20 ` [RFC PATCH v8 10/24] ceph: implement -o test_dummy_encryption mount option Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 11/24] ceph: add fscrypt ioctls Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 12/24] ceph: decode alternate_name in lease info Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 13/24] ceph: make ceph_msdc_build_path use ref-walk Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 14/24] ceph: add encrypted fname handling to ceph_mdsc_build_path Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 15/24] ceph: send altname in MClientRequest Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 16/24] ceph: encode encrypted name in dentry release Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 17/24] ceph: properly set DCACHE_NOKEY_NAME flag in lookup Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 18/24] ceph: make d_revalidate call fscrypt revalidator for encrypted dentries Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 19/24] ceph: add helpers for converting names for userland presentation Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 20/24] ceph: add fscrypt support to ceph_fill_trace Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 21/24] ceph: add support to readdir for encrypted filenames Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 22/24] ceph: create symlinks with encrypted and base64-encoded targets Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 23/24] ceph: make ceph_get_name decrypt filenames Jeff Layton
2021-08-26 16:20 ` [RFC PATCH v8 24/24] ceph: add a new ceph.fscrypt.auth vxattr Jeff Layton

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