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From:   David Howells <dhowells@redhat.com>
In-Reply-To: <163819627469.215744.3603633690679962985.stgit@warthog.procyon.org.uk>
References: <163819627469.215744.3603633690679962985.stgit@warthog.procyon.org.uk> <163819575444.215744.318477214576928110.stgit@warthog.procyon.org.uk>
To:     linux-cachefs@redhat.com
Cc:     dhowells@redhat.com, Trond Myklebust <trondmy@hammerspace.com>,
        Anna Schumaker <anna.schumaker@netapp.com>,
        Steve French <sfrench@samba.org>,
        Dominique Martinet <asmadeus@codewreck.org>,
        Jeff Layton <jlayton@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Omar Sandoval <osandov@osandov.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org,
        linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org,
        v9fs-developer@lists.sourceforge.net,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 35/64] cachefiles: Add security derivation
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Date:   Mon, 29 Nov 2021 21:40:55 +0000
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I missed out the patch description:

    cachefiles: Add security derivation
    
    Implement code to derive a new set of creds for the cachefiles to use when
    making VFS or I/O calls and to change the auditing info since the
    application interacting with the network filesystem is not accessing the
    cache directly.  Cachefiles uses override_creds() to change the effective
    creds temporarily.
    
    set_security_override_from_ctx() is called to derive the LSM 'label' that
    the cachefiles driver will act with.  set_create_files_as() is called to
    determine the LSM 'label' that will be applied to files and directories
    created in the cache.  These functions alter the new creds.
    
    Also implement a couple of functions to wrap the calls to begin/end cred
    overriding.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    cc: linux-cachefs@redhat.com

David