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sunrpc: Const-ify instances of struct svc_xprt_ops 

Close an attack vector by moving the arrays of server-side transport
methods to read-only memory.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2017-08-01 11:59:49 -04:00 committed by J. Bruce Fields
parent bac966d606
commit 2412e92760
3 changed files with 7 additions and 7 deletions
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4
include/linux/sunrpc/svc_xprt.h
View File

@ -31,7 +31,7 @@ struct svc_xprt_ops {
struct svc_xprt_class {
const char *xcl_name;
struct module *xcl_owner;
struct svc_xprt_ops *xcl_ops;
const struct svc_xprt_ops *xcl_ops;
struct list_head xcl_list;
u32 xcl_max_payload;
int xcl_ident;
@ -49,7 +49,7 @@ struct svc_xpt_user {
struct svc_xprt {
struct svc_xprt_class *xpt_class;
struct svc_xprt_ops *xpt_ops;
const struct svc_xprt_ops *xpt_ops;
struct kref xpt_ref;
struct list_head xpt_list;
struct list_head xpt_ready;

6
net/sunrpc/svcsock.c
View File

@ -687,7 +687,7 @@ static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
}
static struct svc_xprt_ops svc_udp_ops = {
static const struct svc_xprt_ops svc_udp_ops = {
.xpo_create = svc_udp_create,
.xpo_recvfrom = svc_udp_recvfrom,
.xpo_sendto = svc_udp_sendto,
@ -1229,7 +1229,7 @@ static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
{
}
static struct svc_xprt_ops svc_tcp_bc_ops = {
static const struct svc_xprt_ops svc_tcp_bc_ops = {
.xpo_create = svc_bc_tcp_create,
.xpo_detach = svc_bc_tcp_sock_detach,
.xpo_free = svc_bc_sock_free,
@ -1263,7 +1263,7 @@ static void svc_cleanup_bc_xprt_sock(void)
}
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
static struct svc_xprt_ops svc_tcp_ops = {
static const struct svc_xprt_ops svc_tcp_ops = {
.xpo_create = svc_tcp_create,
.xpo_recvfrom = svc_tcp_recvfrom,
.xpo_sendto = svc_tcp_sendto,

4
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -70,7 +70,7 @@ static int svc_rdma_has_wspace(struct svc_xprt *xprt);
static int svc_rdma_secure_port(struct svc_rqst *);
static void svc_rdma_kill_temp_xprt(struct svc_xprt *);
static struct svc_xprt_ops svc_rdma_ops = {
static const struct svc_xprt_ops svc_rdma_ops = {
.xpo_create = svc_rdma_create,
.xpo_recvfrom = svc_rdma_recvfrom,
.xpo_sendto = svc_rdma_sendto,
@ -98,7 +98,7 @@ static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *,
static void svc_rdma_bc_detach(struct svc_xprt *);
static void svc_rdma_bc_free(struct svc_xprt *);
static struct svc_xprt_ops svc_rdma_bc_ops = {
static const struct svc_xprt_ops svc_rdma_bc_ops = {
.xpo_create = svc_rdma_bc_create,
.xpo_detach = svc_rdma_bc_detach,
.xpo_free = svc_rdma_bc_free,