[Linux-kernel-mentees] [RFC PATCH] checkpatch: add shebang check to EXECUTE_PERMISSIONS

[Ujjwal Kumar <ujjwalkumar0501@gmail.com>]

checkpatch script checks for invalid EXECUTE_PERMISSIONS on source
files. The script leverages filename extensions and its path in
the repository to decide whether to allow execute permissions on
the file or not.

Based on current check conditions, a perl script file without
'.pl' extension in its filename and not belonging to 'scripts/'
directory is reported as ERROR which is a false-positive.

The script can correctly handle patches with mode changes and
shebang line if shebang is taken into account. So, along with
the current check conditions, adding the shebang check in the
check conditions can improve the reports of the script.

Signed-off-by: Ujjwal Kumar <ujjwalkumar0501@gmail.com>
---
 scripts/checkpatch.pl | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index fab38b493cef..e596d30794bf 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1795,6 +1795,23 @@ sub get_stat_here {
 	return $herectx;
 }
 
+sub get_shebang {
+	my ($linenr, $realfile) = @_;
+	my $rawline = "";
+	my $shebang = "";
+
+	$rawline = raw_line($linenr, 3);
+	if (defined $rawline &&
+		$rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
+		if (defined $1 && $1 == 1) {
+			$shebang = raw_line($linenr, 4);
+			$shebang = substr $shebang, 1;
+		}
+	}
+
+	return $shebang;
+}
+
 sub cat_vet {
 	my ($vet) = @_;
 	my ($res, $coded);
@@ -2680,7 +2697,9 @@ sub process {
 # Check for incorrect file permissions
 		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
 			my $permhere = $here . "FILE: $realfile\n";
+			my $shebang = get_shebang($linenr, $realfile);
 			if ($realfile !~ m@scripts/@ &&
+			    $shebang !~ /^#!\s*(\/\w)+.*/ &&
 			    $realfile !~ /\.(py|pl|awk|sh)$/) {
 				ERROR("EXECUTE_PERMISSIONS",
 				      "do not set execute permissions for source files\n" . $permhere);

base-commit: d67bc7812221606e1886620a357b13f906814af7
-- 
2.26.2

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