Add support for SIOCGIFCONF ioctl in hostinet.

PiperOrigin-RevId: 386511818

pkg/sentry/socket/hostinet/socket_unsafe.go

@@ -67,7 +67,7 @@ func ioctl(ctx context.Context, fd int, io usermem.IO, args arch.SyscallArgument
 			AddressSpaceActive: true,
 		})
 		return 0, err
-	case unix.SIOCGIFFLAGS:
+	case unix.SIOCGIFFLAGS, unix.SIOCGIFCONF:
 		cc := &usermem.IOCopyContext{
 			Ctx: ctx,
 			IO:  io,

runsc/boot/filter/config.go

@@ -463,6 +463,10 @@ func hostInetFilters() seccomp.SyscallRules {
 				seccomp.MatchAny{},
 				seccomp.EqualTo(unix.SIOCGIFFLAGS),
 			},
+			{
+				seccomp.MatchAny{},
+				seccomp.EqualTo(unix.SIOCGIFCONF),
+			},
 		},
 		unix.SYS_LISTEN:   {},
 		unix.SYS_READV:    {},