pkg/runtest: tell ASAN to not mess with our NONFAILING

It seems that different gcc's have different defaults for ASAN flags.
Some fail with:

        run.go:67: nonfailing none/thr/repeat            : FAIL: run 0: call 0 is not executed
            	ASAN:DEADLYSIGNAL
            	=================================================================
            	==67143==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f7b0befb0a2 bp 0x7f7b0cfdad10 sp 0x7f7b0cfda490 T1)
            	    #0 0x7f7b0befb0a1  (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x8d0a1)
            	    #1 0x404bbb in syz_compare(long, long, long, long) (/tmp/utor355225125.0+0x404bbb)
            	    #2 0x403cdf in execute_call(thread_t*) (/tmp/utor355225125.0+0x403cdf)
            	    #3 0x404006 in worker_thread(void*) (/tmp/utor355225125.0+0x404006)
            	    #4 0x7f7b0bc584a3 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x74a3)
            	    #5 0x7f7b0b99ad0e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe8d0e)

            	AddressSanitizer can not provide additional info.
            	SUMMARY: AddressSanitizer: SEGV (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x8d0a1)
            	Thread T1 created by T0 here:
            	    #0 0x7f7b0be9ef59 in __interceptor_pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x30f59)
            	    #1 0x406117 in execute_one() (/tmp/utor355225125.0+0x406117)

2 files changed, 23 insertions, 13 deletions

diff --git a/pkg/ipc/ipc.go b/pkg/ipc/ipc.go
index 4e41f92fe..11e73835b 100644
--- a/pkg/ipc/ipc.go
+++ b/pkg/ipc/ipc.go
@@ -586,6 +586,8 @@ func makeCommand(pid int, bin []string, config *Config, inFile, outFile *os.File
 		cmd.ExtraFiles = []*os.File{inFile, outFile}
 	}
 	cmd.Dir = dir
+	// Tell ASAN to not mess with our NONFAILING.
+	cmd.Env = append(append([]string{}, os.Environ()...), "ASAN_OPTIONS=handle_segv=0 allow_user_segv_handler=1")
 	cmd.Stdin = outrp
 	cmd.Stdout = inwp
 	if config.Flags&FlagDebug != 0 {
diff --git a/pkg/runtest/run.go b/pkg/runtest/run.go
index 2730e3e02..2da871fe6 100644
--- a/pkg/runtest/run.go
+++ b/pkg/runtest/run.go
@@ -551,19 +551,7 @@ func parseBinOutput(req *RunRequest) ([]*ipc.ProgInfo, error) {
 
 func RunTest(req *RunRequest, executor string) {
 	if req.Bin != "" {
-		tmpDir, err := ioutil.TempDir("", "syz-runtest")
-		if err != nil {
-			req.Err = fmt.Errorf("failed to create temp dir: %v", err)
-			return
-		}
-		defer os.RemoveAll(tmpDir)
-		req.Output, req.Err = osutil.RunCmd(20*time.Second, tmpDir, req.Bin)
-		if verr, ok := req.Err.(*osutil.VerboseError); ok {
-			// The process can legitimately do something like exit_group(1).
-			// So we ignore the error and rely on the rest of the checks (e.g. syscall return values).
-			req.Err = nil
-			req.Output = verr.Output
-		}
+		runTestC(req)
 		return
 	}
 	req.Cfg.Executor = executor
@@ -607,3 +595,23 @@ func RunTest(req *RunRequest, executor string) {
 		req.Info = append(req.Info, info)
 	}
 }
+
+func runTestC(req *RunRequest) {
+	tmpDir, err := ioutil.TempDir("", "syz-runtest")
+	if err != nil {
+		req.Err = fmt.Errorf("failed to create temp dir: %v", err)
+		return
+	}
+	defer os.RemoveAll(tmpDir)
+	cmd := osutil.Command(req.Bin)
+	cmd.Dir = tmpDir
+	// Tell ASAN to not mess with our NONFAILING.
+	cmd.Env = append(append([]string{}, os.Environ()...), "ASAN_OPTIONS=handle_segv=0 allow_user_segv_handler=1")
+	req.Output, req.Err = osutil.Run(20*time.Second, cmd)
+	if verr, ok := req.Err.(*osutil.VerboseError); ok {
+		// The process can legitimately do something like exit_group(1).
+		// So we ignore the error and rely on the rest of the checks (e.g. syscall return values).
+		req.Err = nil
+		req.Output = verr.Output
+	}
+}