nfsd4: const-ify nfsd4_ops

nfsd4_ops contains function pointers, and marking it as constant avoids
it being able to be used as an attach vector for code injections.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 3cbd065..d27e75a 100644 (file)
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1584,7 +1584,7 @@ struct nfsd4_operation {
                        union nfsd4_op_u *);
 };
 
-static struct nfsd4_operation nfsd4_ops[];
+static const struct nfsd4_operation nfsd4_ops[];
 
 static const char *nfsd4_op_name(unsigned opnum);
 
@@ -1621,7 +1621,7 @@ static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
        return nfs_ok;
 }
 
-static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
+static inline const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
 {
        return &nfsd4_ops[op->opnum];
 }
@@ -1639,10 +1639,9 @@ static bool need_wrongsec_check(struct svc_rqst *rqstp)
        struct nfsd4_compoundargs *argp = rqstp->rq_argp;
        struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
        struct nfsd4_op *next = &argp->ops[resp->opcnt];
-       struct nfsd4_operation *thisd;
-       struct nfsd4_operation *nextd;
+       const struct nfsd4_operation *thisd = OPDESC(this);
+       const struct nfsd4_operation *nextd;
 
-       thisd = OPDESC(this);
        /*
         * Most ops check wronsec on our own; only the putfh-like ops
         * have special rules.
@@ -1695,7 +1694,7 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
        struct nfsd4_compoundargs *args = rqstp->rq_argp;
        struct nfsd4_compoundres *resp = rqstp->rq_resp;
        struct nfsd4_op *op;
-       struct nfsd4_operation *opdesc;
+       const struct nfsd4_operation *opdesc;
        struct nfsd4_compound_state *cstate = &resp->cstate;
        struct svc_fh *current_fh = &cstate->current_fh;
        struct svc_fh *save_fh = &cstate->save_fh;
@@ -2108,7 +2107,7 @@ static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
        return (op_encode_hdr_size + 3) * sizeof(__be32);
 }
 
-static struct nfsd4_operation nfsd4_ops[] = {
+static const struct nfsd4_operation nfsd4_ops[] = {
        [OP_ACCESS] = {
                .op_func = nfsd4_access,
                .op_name = "OP_ACCESS",