pkg/compiler: restore generation of unsupported syscalls

Unfortunately this is sitll needed, see the added comment.

Update #191

1 files changed, 3 insertions, 0 deletions

diff --git a/pkg/host/host.go b/pkg/host/host.go
index 720bb60f1..af89ac5aa 100644
--- a/pkg/host/host.go
+++ b/pkg/host/host.go
@@ -38,6 +38,9 @@ func DetectSupportedSyscalls() (map[*sys.Call]bool, error) {
 }
 
 func isSupported(kallsyms []byte, c *sys.Call) bool {
+	if c.NR == ^uint64(0) {
+		return false // don't even have a syscall number
+	}
 	if strings.HasPrefix(c.CallName, "syz_") {
 		return isSupportedSyzkall(c)
 	}