selftests/x86: Add a fork() to entry_from_vm86 to catch fork bugs

Mere possession of vm86 state is strange. Make sure that nothing gets corrupted if we fork after calling vm86(). Signed-off-by: Andy Lutomirski <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Stas Sergeev <[email protected]> Link: http://lkml.kernel.org/r/08f83295460a80e41dc5e3e81ec40d6844d316f5.1446270067.git.luto@kernel.org Signed-off-by: Thomas Gleixner <[email protected]>
CamonZ · Oct 31, 2015 · 226f1f7 · 226f1f7
1 parent ababae4
commit 226f1f7
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/tools/testing/selftests/x86/entry_from_vm86.c b/tools/testing/selftests/x86/entry_from_vm86.c
@@ -230,5 +230,9 @@ int main(void)
 	}
 	clearhandler(SIGSEGV);
 
+	/* Make sure nothing explodes if we fork. */
+	if (fork() > 0)
+		return 0;
+
 	return (nerrs == 0 ? 0 : 1);
 }