From 2a1303357c3d928cca95601241fc16baca0e5f41 Mon Sep 17 00:00:00 2001
From: Andrei Vagin <avagin@google.com>
Date: Fri, 16 Aug 2019 17:32:20 -0700
Subject: ptrace: detect if a stub process exited unexpectedly

PiperOrigin-RevId: 263880577
---
 pkg/sentry/platform/ptrace/subprocess.go | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'pkg')

diff --git a/pkg/sentry/platform/ptrace/subprocess.go b/pkg/sentry/platform/ptrace/subprocess.go
index 79501682d..6bf7cd097 100644
--- a/pkg/sentry/platform/ptrace/subprocess.go
+++ b/pkg/sentry/platform/ptrace/subprocess.go
@@ -354,6 +354,9 @@ func (t *thread) wait(outcome waitOutcome) syscall.Signal {
 				continue // Spurious stop.
 			}
 			if stopSig == syscall.SIGTRAP {
+				if status.TrapCause() == syscall.PTRACE_EVENT_EXIT {
+					t.dumpAndPanic("wait failed: the process exited")
+				}
 				// Re-encode the trap cause the way it's expected.
 				return stopSig | syscall.Signal(status.TrapCause()<<8)
 			}
-- 
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