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Patch "nfsd: check for use of the closed special stateid" has been added to the 4.4-stable tree

PATCH [email protected] 1 participant 1 message Feb 1, 2018

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This is a note to let you know that I've just added the patch titled

nfsd: check for use of the closed special stateid

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
nfsd-check-for-use-of-the-closed-special-stateid.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From foo@baz Thu Feb 1 14:14:46 CET 2018

From: Andrew Elble <[email protected]>
Date: Thu, 9 Nov 2017 13:41:10 -0500
Subject: nfsd: check for use of the closed special stateid

From: Andrew Elble <[email protected]>

[ Upstream commit ae254dac721d44c0bfebe2795df87459e2e88219 ]

Prevent the use of the closed (invalid) special stateid by clients.

Signed-off-by Andrew Elble <[email protected]>
Signed-off-by J. Bruce Fields <[email protected]>
Signed-off-by Sasha Levin <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 fs/nfsd/nfs4state.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
fs/nfsd/nfs4state.c +5 -2
@@ -72,6 +72,7 @@ static u64 current_sessionid = 1;
 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
 #define ONE_STATEID(stateid)  (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
+#define CLOSE_STATEID(stateid)  (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
 
 /* forward declarations */
 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);

@@ -4704,7 +4705,8 @@ static __be32 nfsd4_validate_stateid(str
 	struct nfs4_stid *s;
 	__be32 status = nfserr_bad_stateid;
 
-	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
+		CLOSE_STATEID(stateid))
 		return status;
 	/* Client debugging aid. */
 	if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {

@@ -4762,7 +4764,8 @@ nfsd4_lookup_stateid(struct nfsd4_compou
 	else if (typemask & NFS4_DELEG_STID)
 		typemask |= NFS4_REVOKED_DELEG_STID;
 
-	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
+		CLOSE_STATEID(stateid))
 		return nfserr_bad_stateid;
 	status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
 	if (status == nfserr_stale_clientid) {

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/nfsd-check-for-use-of-the-closed-special-stateid.patch