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diff --git a/sys/compat/linux/linux_socket.h b/sys/compat/linux/linux_socket.h
--- a/sys/compat/linux/linux_socket.h
+++ b/sys/compat/linux/linux_socket.h
@@ -199,6 +199,7 @@
#define LINUX_SO_SNDBUFFORCE 32
#define LINUX_SO_RCVBUFFORCE 33
#define LINUX_SO_PROTOCOL 38
+#define LINUX_SO_PEERGROUPS 59
/* Socket options */
#define LINUX_IP_TOS 1
diff --git a/sys/compat/linux/linux_socket.c b/sys/compat/linux/linux_socket.c
--- a/sys/compat/linux/linux_socket.c
+++ b/sys/compat/linux/linux_socket.c
@@ -1863,6 +1863,43 @@
return (error);
}
+static int
+linux_getsockopt_so_peergroups(struct thread *td,
+ struct linux_getsockopt_args *args)
+{
+ struct xucred xu;
+ socklen_t xulen, len;
+ int error, i;
+
+ xulen = sizeof(xu);
+ error = kern_getsockopt(td, args->s, 0,
+ LOCAL_PEERCRED, &xu, UIO_SYSSPACE, &xulen);
+ if (error != 0)
+ return (error);
+
+ len = xu.cr_ngroups * sizeof(l_gid_t);
+ if (args->optlen < len) {
+ error = copyout(&len, PTRIN(args->optlen), sizeof(len));
+ if (error == 0)
+ error = ERANGE;
+ return (error);
+ }
+
+ /*
+ * "- 1" to skip the primary group.
+ */
+ for (i = 0; i < xu.cr_ngroups - 1; i++) {
+ error = copyout(xu.cr_groups + i + 1,
+ (void *)(args->optval + i * sizeof(l_gid_t)),
+ sizeof(l_gid_t));
+ if (error != 0)
+ return (error);
+ }
+
+ error = copyout(&len, PTRIN(args->optlen), sizeof(len));
+ return (error);
+}
+
static int
linux_getsockopt_so_peersec(struct thread *td,
struct linux_getsockopt_args *args)
@@ -1899,8 +1936,15 @@
level = linux_to_bsd_sockopt_level(args->level);
switch (level) {
case SOL_SOCKET:
- if (args->optname == LINUX_SO_PEERSEC)
+ switch (args->optname) {
+ case LINUX_SO_PEERGROUPS:
+ return (linux_getsockopt_so_peergroups(td, args));
+ case LINUX_SO_PEERSEC:
return (linux_getsockopt_so_peersec(td, args));
+ default:
+ break;
+ }
+
name = linux_to_bsd_so_sockopt(args->optname);
switch (name) {
case LOCAL_CREDS_PERSISTENT:

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