checkpatch: match more world writable permissions

Currently checkpatch will fuss if one uses world writable settings in
debugfs files and DEVICE_ATTR uses by testing S_IWUGO but not testing
S_IWOTH, S_IRWXUGO or S_IALLUGO.

Extend the check to catch all cases exporting world writable permissions
including octal values.

[akpm@linux-foundation.org: remove stray $]
Signed-off-by: Joe Perches <joe@perches.com>
Original-patch-by: Nicholas Mc Guire <hofrat@osadl.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -443,6 +443,14 @@ foreach my $entry (@mode_permission_funcs) {
 	$mode_perms_search .= $entry->[0];
 }
 
+our $mode_perms_world_writable = qr{
+	S_IWUGO		|
+	S_IWOTH		|
+	S_IRWXUGO	|
+	S_IALLUGO	|
+	0[0-7][0-7][2367]
+}x;
+
 our $allowed_asm_includes = qr{(?x:
 	irq|
 	memory|
@@ -5356,8 +5364,8 @@ sub process {
 			}
 		}
 
-		if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
-		    $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
+		if ($line =~ /debugfs_create_\w+.*\b$mode_perms_world_writable\b/ ||
+		    $line =~ /DEVICE_ATTR.*\b$mode_perms_world_writable\b/) {
 			WARN("EXPORTED_WORLD_WRITABLE",
 			     "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
 		}