lockd accepts SM_NOTIFY calls only from a privileged process on the
local system. If lockd uses an AF_INET6 listener, the sender's address
(ie the local rpc.statd) will be the IPv6 loopback address, not the
IPv4 loopback address.
Make sure the privilege test in nlmsvc_proc_sm_notify() and
nlm4svc_proc_sm_notify() works for both AF_INET and AF_INET6 family
addresses by refactoring the test into a helper and adding support for
IPv6 addresses.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/lockd/svc4proc.c | 6 ++----
fs/lockd/svcproc.c | 6 ++----
include/linux/lockd/lockd.h | 41 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+), 8 deletions(-)
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index 89eb6f9..1ca972d 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -432,11 +432,9 @@ nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
{
struct sockaddr_in saddr;
- memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
-
dprintk("lockd: SM_NOTIFY called\n");
- if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
- || ntohs(saddr.sin_port) >= 1024) {
+
+ if (!nlm_privileged_requester(rqstp)) {
char buf[RPC_MAX_ADDRBUFLEN];
printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
svc_print_addr(rqstp, buf, sizeof(buf)));
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index 361aac2..212e4a3 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -464,11 +464,9 @@ nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
{
struct sockaddr_in saddr;
- memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
-
dprintk("lockd: SM_NOTIFY called\n");
- if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
- || ntohs(saddr.sin_port) >= 1024) {
+
+ if (!nlm_privileged_requester(rqstp)) {
char buf[RPC_MAX_ADDRBUFLEN];
printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
svc_print_addr(rqstp, buf, sizeof(buf)));
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 165ef7a..888b92c 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -277,6 +277,47 @@ static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
return file->f_file->f_path.dentry->d_inode;
}
+static inline int __nlm_privileged_request4(const struct sockaddr *sap)
+{
+ const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+ return (sin->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) &&
+ (ntohs(sin->sin_port) < 1024);
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static inline int __nlm_privileged_request6(const struct sockaddr *sap)
+{
+ const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+ return (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK) &&
+ (ntohs(sin6->sin6_port) < 1024);
+}
+#else /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
+static inline int __nlm_privileged_request6(const struct sockaddr *sap)
+{
+ return 0;
+}
+#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
+
+/*
+ * Ensure incoming requests are from local privileged callers.
+ *
+ * Return TRUE if sender is local and is connecting via a privileged port;
+ * otherwise return FALSE.
+ */
+static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
+{
+ const struct sockaddr *sap = svc_addr(rqstp);
+
+ switch (sap->sa_family) {
+ case AF_INET:
+ return __nlm_privileged_request4(sap);
+ case AF_INET6:
+ return __nlm_privileged_request6(sap);
+ default:
+ return 0;
+ }
+}
+
static inline int __nlm_cmp_addr4(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
--
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