Message-ID: <41F48E70.5090200@comcast.net>
Date: Mon, 24 Jan 2005 00:58:08 -0500
From: John Richard Moser <nigelenki@comcast.net>
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To: linux-kernel@vger.kernel.org
Subject: LSM hook addition?
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Can someone point me to documentation or give me a small patch to add an
LSM hook to kernel 2.6.10 in fs/namei.c at line 1986:

        new_dentry = lookup_create(&nd, 0);
        error = PTR_ERR(new_dentry);
        if (!IS_ERR(new_dentry)) {
                error = security_inode_make_hardlink(old_nd); // ADD
                error = vfs_link(old_nd.dentry, nd.dentry->d_inode,
new_dentry);

I believe this would be sufficient to finish an LSM module to implement
linking restrictions from GrSecurity.  I did Symlinks in an LSM module,
but haven't tested it out; it's purely academic.  I guess adding an LSM
hook would be an interesting academic experience; I'd enjoy examining a
patch that adds this hook, and then trying to add another hook myself.

The hook here would be used (in my academic exploration) to prevent hard
links from being created to files you don't own, unless you're root.

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