This is a note to let you know that I've just added the patch titled
nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid
to the 4.1-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-do-nfs4_check_fh-in-nfs4_check_file-instead-of-nfs4_check_olstateid.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8fcd461db7c09337b6d2e22d25eb411123f379e3 Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Date: Thu, 30 Jul 2015 06:57:46 -0400
Subject: nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
commit 8fcd461db7c09337b6d2e22d25eb411123f379e3 upstream.
Currently, preprocess_stateid_op calls nfs4_check_olstateid which
verifies that the open stateid corresponds to the current filehandle in the
call by calling nfs4_check_fh.
If the stateid is a NFS4_DELEG_STID however, then no such check is done.
This could cause incorrect enforcement of permissions, because the
nfsd_permission() call in nfs4_check_file uses current the current
filehandle, but any subsequent IO operation will use the file descriptor
in the stateid.
Move the call to nfs4_check_fh into nfs4_check_file instead so that it
can be done for all stateid types.
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
[bfields: moved fh check to avoid NULL deref in special stateid case]
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4397,9 +4397,9 @@ laundromat_main(struct work_struct *laun
queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
}
-static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
+static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
{
- if (!fh_match(&fhp->fh_handle, &stp->st_stid.sc_file->fi_fhandle))
+ if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
return nfserr_bad_stateid;
return nfs_ok;
}
@@ -4599,9 +4599,6 @@ nfs4_check_olstateid(struct svc_fh *fhp,
{
__be32 status;
- status = nfs4_check_fh(fhp, ols);
- if (status)
- return status;
status = nfsd4_check_openowner_confirmed(ols);
if (status)
return status;
@@ -4652,6 +4649,9 @@ nfs4_preprocess_stateid_op(struct net *n
status = nfserr_bad_stateid;
break;
}
+ if (status)
+ goto out;
+ status = nfs4_check_fh(fhp, s);
if (!status && filpp) {
*filpp = nfs4_find_file(s, flags);
@@ -4761,7 +4761,7 @@ static __be32 nfs4_seqid_op_checks(struc
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
if (status)
return status;
- return nfs4_check_fh(current_fh, stp);
+ return nfs4_check_fh(current_fh, &stp->st_stid);
}
/*
Patches currently in stable-queue which might be from jlayton@xxxxxxxxxxxxxxx are
queue-4.1/nfsd-do-nfs4_check_fh-in-nfs4_check_file-instead-of-nfs4_check_olstateid.patch
queue-4.1/nfsd-refactor-nfs4_preprocess_stateid_op.patch
--
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