kbuild: check for leaked CONFIG_ symbols to userspace

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/headers_check.pl b/scripts/headers_check.pl
index 5bdd9753007a3ae6103bdab7838e94413677cf68..72924a7fcf1ea2b88f982c1033402847ba9def36 100644 (file)
--- a/scripts/headers_check.pl
+++ b/scripts/headers_check.pl
@@ -16,7 +16,7 @@
 #
 # 2) It is checked that prototypes does not use "extern"
 #
-# 3) TODO: check for leaked CONFIG_ symbols
+# 3) Check for leaked CONFIG_ symbols
 
 use strict;
 
@@ -36,6 +36,7 @@ foreach my $file (@files) {
                $lineno++;
                check_include();
                check_prototypes();
+               check_config();
        }
        close FH;
 }
@@ -64,3 +65,11 @@ sub check_prototypes
                printf STDERR "$filename:$lineno: extern's make no sense in userspace\n";
        }
 }
+
+sub check_config
+{
+       if ($line =~ m/[^a-zA-Z0-9_]+CONFIG_([a-zA-Z0-9]+)[^a-zA-Z0-9]/) {
+               printf STDERR "$filename:$lineno: leaks CONFIG_$1 to userspace where it is not valid\n";
+       }
+}
+