Re: [PATCH] knfsd: new linux kenel nfs patch

G. Allen Morris III (gam3@dharma.sehda.com)
Tue, 29 Sep 1998 09:16:04 -0700

I see NULL dcookies in the file handle only when I put them there in
a test. They caused the OOPs before they reached the validation
test. (I was running security tests.)

The problem is in find_fhe. It seem that unused entries in the
cache have NULL dentry entries. This would cause find_fhe to return
an fhe that contained a NULL dentry and the next test would OOPs
when it executed

dentry = fhe->dentry;
inode = dentry->d_inode;

Allen

P.S. I mangled nfsbug.c to do these tests. I will try to make it pretty
enough to post ;-) soon.

>>>Bill Hawes said:
> G. Allen Morris III wrote:
>
> > Here is a newer patch for kernel.
> >
> > This has three changes:
> >
> > 3) An OOPS was caused if the dcookie in the nfs file handle was
> > NULL.
>
> Hi Allen,
>
> Under what conditions are you seeing a NULL dcookie in the filehandle? This
> shouldn't happen, and if an external client sent such a mangled fh it should
> fail the validation test.
>
> Do you have an example that triggers this problem?
>

---------------------------------
G. Allen Morris III

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