[PATCH urgent 1/2] selftests/x86: Add a fork() to entry_from_vm86 to catch fork bugs

[Andy Lutomirski]

Mere possession of vm86 state is strange.  Make sure that nothing
gets corrupted if we fork after calling vm86().

Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
---
 tools/testing/selftests/x86/entry_from_vm86.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/x86/entry_from_vm86.c b/tools/testing/selftests/x86/entry_from_vm86.c
index 9a43a59a9bb4..13b2965472e3 100644
--- a/tools/testing/selftests/x86/entry_from_vm86.c
+++ b/tools/testing/selftests/x86/entry_from_vm86.c
@@ -229,5 +229,9 @@ int main(void)
 	}
 	clearhandler(SIGSEGV);
 
+	/* Make sure nothing explodes if we fork. */
+	if (fork() > 0)
+		return 0;
+
 	return (nerrs == 0 ? 0 : 1);
 }
-- 
2.4.3

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