I'd rather put more of these sorts of checks into standardized xdr
decoders for the various types rather than have them cluttering up the
core logic in nfs4proc.c and nfs4state.c.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 32 --------------------
fs/nfsd/nfs4xdr.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 73 insertions(+), 39 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a39a542..6bfa293 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2418,31 +2418,6 @@ find_file(struct inode *ino)
return NULL;
}
-static inline int access_valid(u32 x, u32 minorversion)
-{
- if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
- return 0;
- if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
- return 0;
- x &= ~NFS4_SHARE_ACCESS_MASK;
- if (minorversion && x) {
- if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
- return 0;
- if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
- return 0;
- x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
- }
- if (x)
- return 0;
- return 1;
-}
-
-static inline int deny_valid(u32 x)
-{
- /* Note: unlike access bits, deny bits may be zero. */
- return x <= NFS4_SHARE_DENY_BOTH;
-}
-
/*
* Called to check deny when READ with all zero stateid or
* WRITE with all zero or all one stateid
@@ -2918,10 +2893,6 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
struct nfs4_delegation *dp = NULL;
__be32 status;
- status = nfserr_inval;
- if (!access_valid(open->op_share_access, resp->cstate.minorversion)
- || !deny_valid(open->op_share_deny))
- goto out;
/*
* Lookup file; if found, lookup stateid and check open request,
* and check for delegations in the process of being recalled.
@@ -3571,9 +3542,6 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
(int)cstate->current_fh.fh_dentry->d_name.len,
cstate->current_fh.fh_dentry->d_name.name);
- if (!access_valid(od->od_share_access, cstate->minorversion)
- || !deny_valid(od->od_share_deny))
- return nfserr_inval;
/* We don't yet support WANT bits: */
od->od_share_access &= NFS4_SHARE_ACCESS_MASK;
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 5779acd..94da8bb 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -639,6 +639,64 @@ nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup
DECODE_TAIL;
}
+static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
+{
+ __be32 *p;
+ u32 w;
+
+ READ_BUF(4);
+ READ32(w);
+ *x = w;
+ switch (w & NFS4_SHARE_ACCESS_MASK) {
+ case NFS4_SHARE_ACCESS_READ:
+ case NFS4_SHARE_ACCESS_WRITE:
+ case NFS4_SHARE_ACCESS_BOTH:
+ break;
+ default:
+ return nfserr_bad_xdr;
+ }
+ w &= !NFS4_SHARE_ACCESS_MASK;
+ if (!w)
+ return nfs_ok;
+ if (!argp->minorversion)
+ return nfserr_bad_xdr;
+ switch (w & NFS4_SHARE_WANT_MASK) {
+ case NFS4_SHARE_WANT_NO_PREFERENCE:
+ case NFS4_SHARE_WANT_READ_DELEG:
+ case NFS4_SHARE_WANT_WRITE_DELEG:
+ case NFS4_SHARE_WANT_ANY_DELEG:
+ case NFS4_SHARE_WANT_NO_DELEG:
+ case NFS4_SHARE_WANT_CANCEL:
+ break;
+ default:
+ return nfserr_bad_xdr;
+ }
+ w &= !NFS4_SHARE_WANT_MASK;
+ if (!w)
+ return nfs_ok;
+ switch (w) {
+ case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
+ case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
+ return nfs_ok;
+ }
+xdr_error:
+ return nfserr_bad_xdr;
+}
+
+static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
+{
+ __be32 *p;
+
+ READ_BUF(4);
+ READ32(*x);
+ /* Note: unlinke access bits, deny bits may be zero. */
+ if (*x & !NFS4_SHARE_DENY_BOTH)
+ return nfserr_bad_xdr;
+ return nfs_ok;
+xdr_error:
+ return nfserr_bad_xdr;
+}
+
static __be32
nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
@@ -649,10 +707,15 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
open->op_openowner = NULL;
/* seqid, share_access, share_deny, clientid, ownerlen */
- READ_BUF(16 + sizeof(clientid_t));
+ READ_BUF(4);
READ32(open->op_seqid);
- READ32(open->op_share_access);
- READ32(open->op_share_deny);
+ status = nfsd4_decode_share_access(argp, &open->op_share_access);
+ if (status)
+ goto xdr_error;
+ status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
+ if (status)
+ goto xdr_error;
+ READ_BUF(sizeof(clientid_t) + 4);
COPYMEM(&open->op_clientid, sizeof(clientid_t));
READ32(open->op_owner.len);
@@ -753,11 +816,14 @@ nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_d
status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
if (status)
return status;
- READ_BUF(12);
+ READ_BUF(4);
READ32(open_down->od_seqid);
- READ32(open_down->od_share_access);
- READ32(open_down->od_share_deny);
-
+ status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
+ if (status)
+ return status;
+ status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
+ if (status)
+ return status;
DECODE_TAIL;
}
--
1.7.4.1
--
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