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From: David Howells <dhowells@redhat.com>
To: NeilBrown <neilb@suse.com>
Cc: dhowells@redhat.com, "J. Bruce Fields" <bfields@fieldses.org>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Trond Myklebust <trond.myklebust@hammerspace.com>,
	Jan Harkes <jaharkes@cs.cmu.edu>,
	linux-nfs@vger.kernel.org, Miklos Szeredi <miklos@szeredi.hu>,
	Jeff Layton <jlayton@kernel.org>,
	linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org,
	coda@cs.cmu.edu, linux-fsdevel@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 1/3] VFS: introduce MAY_ACT_AS_OWNER
Date: Thu, 04 Oct 2018 15:10:13 +0100	[thread overview]
Message-ID: <28763.1538662213@warthog.procyon.org.uk> (raw)
In-Reply-To: <153861496327.30373.10501882399296347125.stgit@noble>

NeilBrown <neilb@suse.com> wrote:

> diff --git a/fs/afs/security.c b/fs/afs/security.c
> index 81dfedb7879f..ac2e39de8bff 100644
> --- a/fs/afs/security.c
> +++ b/fs/afs/security.c
> @@ -349,6 +349,16 @@ int afs_permission(struct inode *inode, int mask)
>  	if (mask & MAY_NOT_BLOCK)
>  		return -ECHILD;
>  
> +	/* Short-circuit for owner */
> +	if (mask & MAY_ACT_AS_OWNER) {
> +		if (inode_owner_or_capable(inode))

You don't know that inode->i_uid in meaningful.  You may have noticed that
afs_permission() ignores i_uid and i_gid entirely.  It queries the server (if
this information is not otherwise cached) to ask what permits the user is
granted - where the user identity is defined by the key returned from
afs_request_key()[*].

So, NAK for the afs piece.

David

[*] If there's no appropriate key, anonymous permits will be used.

  parent reply	other threads:[~2018-10-04 21:03 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-04  1:02 [PATCH 0/3] Fix regression in NFSv3 ACL setting NeilBrown
2018-10-04  1:02 ` [PATCH 3/3] NFSD - Use MAY_ACT_AS_OWNER NeilBrown
2018-10-04  1:02 ` [PATCH 1/3] VFS: introduce MAY_ACT_AS_OWNER NeilBrown
2018-10-04  1:02 ` [PATCH 2/3] VFS: allow MAY_ flags to be easily extended NeilBrown
2018-10-04  2:11   ` [PATCH 2/3 v2] " NeilBrown
2018-10-04 14:10 ` David Howells [this message]
2018-10-04 14:42   ` [PATCH 1/3] VFS: introduce MAY_ACT_AS_OWNER Jan Harkes
2018-10-04 21:55     ` NeilBrown
2018-10-04 21:52   ` NeilBrown
2018-10-04 22:50   ` David Howells

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