linux-kernel - Re: linux-next: manual merge of the selinux tree with the vfs tree

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Message-ID: <20181130013648.GL2217@ZenIV.linux.org.uk>
Date:   Fri, 30 Nov 2018 01:36:49 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     Paul Moore <paul@...l-moore.com>, omosnace@...hat.com,
        sfr@...b.auug.org.au, linux-next@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com,
        selinux@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        LSM <linux-security-module@...r.kernel.org>
Subject: Re: linux-next: manual merge of the selinux tree with the vfs tree

On Fri, Nov 30, 2018 at 01:27:07AM +0000, Al Viro wrote:

> And then there's sb_mount, with 3 instances and arseloads of
> races in 2 out of 3.

PS: the 3rd one (in selinux) is, AFAICS, TOCTOU-free, because
it ignores everything except the mountpoint, which is already
looked up by the caller.  No idea what any out-of-tree ones do,
of course, but judging by the in-tree sample...