On Tue, Aug 09, 2011 at 10:39:04AM -0700, Boaz Harrosh wrote:

On 08/09/2011 10:31 AM, J. Bruce Fields wrote:

quoted

On Mon, Aug 08, 2011 at 05:38:08PM +0200, Bernd Schubert wrote:

quoted

Fan Yong [off-list ref] noticed setting
FMODE_32bithash wouldn't work with nfsd v4, as
nfsd4_readdir() checks for 32 bit cookies. However, according to RFC 3530
cookies have a 64 bit type and cookies are also defined as u64 in
'struct nfsd4_readdir'. So remove the test for >32-bit values.

Wow, thanks, I wonder where that check came from.  Looks like it was
there since the very first nfsv4 commit.

Even for the "very first nfsv4 commit" it sounds like a stupid bug.
Probably a copy/paste from V2 code. What about V3, does V3 code have
this bug?

I didn't read it carefully, but on a quick skim I don't see any similar
checks.

Not only that, but I don't see them in any historical versions either.

So somebody went out of their way to do that check.  Hm.

--b.

Boaz

quoted

Applying.

--b.

quoted

Signed-off-by: Bernd Schubert <redacted>
---
 fs/nfsd/nfs4proc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index e807776..9bf0a66 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c

@@ -691,7 +691,7 @@ nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 	readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 
-	if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
+	if ((cookie == 1) || (cookie == 2) ||
 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 		return nfserr_bad_cookie;
 

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