linux-kernel - Re: [PATCH 35/64] cachefiles: Add security derivation

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Date:   Mon, 29 Nov 2021 21:40:55 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.com
Cc:     dhowells@...hat.com, Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jeff Layton <jlayton@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Omar Sandoval <osandov@...ndov.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 35/64] cachefiles: Add security derivation

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@...hat.com>
    cc: linux-cachefs@...hat.com

David