[Bug 283965] nfs: page fault during nfsrpc_readdir

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 09 Jan 2025 20:53:20 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283965

--- Comment #1 from Alan Somers <asomers@FreeBSD.org> ---
I've determined that the cause of the failure in nfscl_invalidfname is because
my test fuse file system includes the NUL character in its readdir entries. 
That is, it replies something like this:

        ents[0].d_namlen = 3;
        ents[0].d_name = "..";
        ents[1].d_namlen = 2;
        ents[1].d_name = ".";

I can and will fix that in the tests.  But I can't guarantee that other fuse
file systems won't do the same.  Even if I have fusefs sanitize these strings
in-kernel, other file systems might do the same.  For example, I see that ext2
trusts the on-disk data, and copies it into a dirent without sanitizing it.  So
NFS must be able to handle that.

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