checkpatch: look for symbolic permissions and suggest octal instead

S_<FOO> uses should be avoided where octal is more intelligible.

Linus didst say:

: It's *much* easier to parse and understand the octal numbers, while the
: symbolic macro names are just random line noise and hard as hell to
: understand.  You really have to think about it.
:
: So we should rather go the other way: convert existing bad symbolic
: permission bit macro use to just use the octal numbers.
:
: The symbolic names are good for the *other* bits (ie sticky bit, and the
: inode mode _type_ numbers etc), but for the permission bits, the symbolic
: names are just insane crap.  Nobody sane should ever use them.  Not in the
: kernel, not in user space.
(http://lkml.kernel.org/r/CA+55aFw5v23T-zvDZp-MmD_EYxF8WbafwwB59934FV7g21uMGQ@mail.gmail.com)

Link: http://lkml.kernel.org/r/7232ef011d05a92f4caa86a5e9830d87966a2eaf.1470180926.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 43 insertions, 6 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 34b445574011..1c82b01d581a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -541,6 +541,32 @@ our $mode_perms_world_writable = qr{
         0[0-7][0-7][2367]
 }x;
 
+our %mode_permission_string_types = (
+        "S_IRWXU" => 0700,
+        "S_IRUSR" => 0400,
+        "S_IWUSR" => 0200,
+        "S_IXUSR" => 0100,
+        "S_IRWXG" => 0070,
+        "S_IRGRP" => 0040,
+        "S_IWGRP" => 0020,
+        "S_IXGRP" => 0010,
+        "S_IRWXO" => 0007,
+        "S_IROTH" => 0004,
+        "S_IWOTH" => 0002,
+        "S_IXOTH" => 0001,
+        "S_IRWXUGO" => 0777,
+        "S_IRUGO" => 0444,
+        "S_IWUGO" => 0222,
+        "S_IXUGO" => 0111,
+);
+
+#Create a search pattern for all these strings to speed up a loop below
+our $mode_perms_string_search = "";
+foreach my $entry (keys %mode_permission_string_types) {
+        $mode_perms_string_search .= '|' if ($mode_perms_string_search ne "");
+        $mode_perms_string_search .= $entry;
+}
+
 our $allowed_asm_includes = qr{(?x:
         irq|
         memory|
@@ -6003,20 +6029,31 @@ sub process {
                                         $arg_pos--;
                                         $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
                                 }
-                                my $test = "\\b$func\\s*\\(${skip_args}([\\d]+)\\s*[,\\)]";
+                                my $test = "\\b$func\\s*\\(${skip_args}($FuncArg(?:\\|\\s*$FuncArg)*)\\s*[,\\)]";
                                 if ($line =~ /$test/) {
                                         my $val = $1;
                                         $val = $6 if ($skip_args ne "");
-
-                                        if ($val !~ /^0$/ &&
-                                            (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
-                                             length($val) ne 4)) {
+                                        if (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
+                                            ($val =~ /^$Octal$/ && length($val) ne 4)) {
                                                 ERROR("NON_OCTAL_PERMISSIONS",
                                                       "Use 4 digit octal (0777) not decimal permissions\n" . $herecurr);
-                                        } elsif ($val =~ /^$Octal$/ && (oct($val) & 02)) {
+                                        }
+                                        if ($val =~ /^$Octal$/ && (oct($val) & 02)) {
                                                 ERROR("EXPORTED_WORLD_WRITABLE",
                                                       "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
                                         }
+                                        if ($val =~ /\b$mode_perms_string_search\b/) {
+                                                my $to = 0;
+                                                while ($val =~ /\b($mode_perms_string_search)\b(?:\s*\|\s*)?\s*/g) {
+                                                        $to |=  $mode_permission_string_types{$1};
+                                                }
+                                                my $new = sprintf("%04o", $to);
+                                                if (WARN("SYMBOLIC_PERMS",
+                                                         "Symbolic permissions are not preferred. Consider using octal permissions $new.\n" . $herecurr) &&
+                                                    $fix) {
+                                                        $fixed[$fixlinenr] =~ s/\Q$val\E/$new/;
+                                                }
+                                        }
                                 }
                         }
                 }