syz-manager: implement fallback coverage report

2 files changed, 10 insertions, 1 deletions

diff --git a/pkg/ipc/ipc.go b/pkg/ipc/ipc.go
index b488da277..2f7f4e928 100644
--- a/pkg/ipc/ipc.go
+++ b/pkg/ipc/ipc.go
@@ -19,6 +19,7 @@ import (
 	"unsafe"
 
 	"github.com/google/syzkaller/pkg/osutil"
+	"github.com/google/syzkaller/pkg/signal"
 	"github.com/google/syzkaller/prog"
 	"github.com/google/syzkaller/sys/targets"
 )
@@ -333,7 +334,7 @@ func addFallbackSignal(p *prog.Prog, info []CallInfo) {
 		if !inf.Executed || len(inf.Signal) != 0 {
 			continue
 		}
-		inf.Signal = []uint32{uint32(call.Meta.ID)<<16 | uint32(inf.Errno)&0x3ff}
+		inf.Signal = []uint32{signal.EncodeFallback(call.Meta.ID, inf.Errno)}
 	}
 }
 
diff --git a/pkg/signal/signal.go b/pkg/signal/signal.go
index 20deba46a..9af1bcce1 100644
--- a/pkg/signal/signal.go
+++ b/pkg/signal/signal.go
@@ -191,3 +191,11 @@ func Minimize(corpus []Context) []interface{} {
 	}
 	return result
 }
+
+func EncodeFallback(id, errno int) uint32 {
+	return uint32(id)<<16 | uint32(errno)&0x3ff
+}
+
+func DecodeFallback(s uint32) (int, int) {
+	return int(s >> 16), int(s & 0x3ff)
+}