executor: remove ability to detect kernel bugs

This ability was never used but we maintain a bunch of code for it.
syzkaller also recently learned to spoof this error code
with some ptrace magic (probably intercepted control flow again
and exploited executor binary).
Drop all of it.

2 files changed, 5 insertions, 9 deletions

diff --git a/tools/syz-execprog/execprog.go b/tools/syz-execprog/execprog.go
index 82fa00906..f65ad9d9b 100644
--- a/tools/syz-execprog/execprog.go
+++ b/tools/syz-execprog/execprog.go
@@ -140,13 +140,9 @@ func (ctx *Context) execute(pid int, env *ipc.Env, entry *prog.LogEntry) {
 	if *flagOutput {
 		ctx.logProgram(pid, entry.P, callOpts)
 	}
-	output, info, failed, hanged, err := env.Exec(callOpts, entry.P)
-	if failed {
-		log.Logf(0, "BUG: executor-detected bug:\n%s", output)
-	}
+	output, info, hanged, err := env.Exec(callOpts, entry.P)
 	if ctx.config.Flags&ipc.FlagDebug != 0 || err != nil {
-		log.Logf(0, "result: failed=%v hanged=%v err=%v\n\n%s",
-			failed, hanged, err, output)
+		log.Logf(0, "result: hanged=%v err=%v\n\n%s", hanged, err, output)
 	}
 	if info != nil {
 		ctx.printCallResults(info)
diff --git a/tools/syz-stress/stress.go b/tools/syz-stress/stress.go
index e5f4ff845..d1beee34d 100644
--- a/tools/syz-stress/stress.go
+++ b/tools/syz-stress/stress.go
@@ -114,14 +114,14 @@ func execute(pid int, env *ipc.Env, execOpts *ipc.ExecOpts, p *prog.Prog) {
 		fmt.Printf("executing program %v\n%s\n", pid, p.Serialize())
 		outMu.Unlock()
 	}
-	output, _, failed, hanged, err := env.Exec(execOpts, p)
+	output, _, hanged, err := env.Exec(execOpts, p)
 	if err != nil {
 		fmt.Printf("failed to execute executor: %v\n", err)
 	}
-	if failed || hanged || err != nil || *flagOutput {
+	if hanged || err != nil || *flagOutput {
 		fmt.Printf("PROGRAM:\n%s\n", p.Serialize())
 	}
-	if failed || hanged || err != nil || *flagOutput {
+	if hanged || err != nil || *flagOutput {
 		os.Stdout.Write(output)
 	}
 }