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nfsd4: const-ify nfsd4_ops

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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>
This commit is contained in:
Christoph Hellwig 2017-05-08 23:46:47 +02:00
parent e9679189e3
commit bb2a8b0cd1
1 changed files with 6 additions and 7 deletions
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13
fs/nfsd/nfs4proc.c
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@ -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;
@ -2109,7 +2108,7 @@ 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",