checkpatch: improve octal permissions tests

Add world writable permissions tests for the various functions like
debugfs etc...

Add $String type for $FuncArg so that string constants are matched.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 501c286..2b77d96 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -298,6 +298,7 @@ our $Binary = qr{(?i)0b[01]+$Int_type?};
 our $Hex       = qr{(?i)0x[0-9a-f]+$Int_type?};
 our $Int       = qr{[0-9]+$Int_type?};
 our $Octal     = qr{0[0-7]+$Int_type?};
+our $String    = qr{"[X\t]*"};
 our $Float_hex = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 our $Float_dec = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 our $Float_int = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
@@ -517,7 +518,7 @@ our $Typecast       = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 
 our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
 our $LvalOrFunc        = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
-our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
+our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};
 
 our $declaration_macros = qr{(?x:
        (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,2}\s*\(|
@@ -5261,6 +5262,9 @@ sub process {
                                             length($val) ne 4)) {
                                                ERROR("NON_OCTAL_PERMISSIONS",
                                                      "Use 4 digit octal (0777) not decimal permissions\n" . $herecurr);
+                                       } elsif ($val =~ /^$Octal$/ && (oct($val) & 02)) {
+                                               ERROR("EXPORTED_WORLD_WRITABLE",
+                                                     "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
                                        }
                                }
                        }