linux-kernel - [PATCH] checkpatch: catch all world writable debugfs_create

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Date:	Fri, 13 Mar 2015 15:23:22 -0400
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Andy Whitcroft <apw@...onical.com>
Cc:	Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org,
	Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] checkpatch: catch all world writable debugfs_create_file

Currently checkpatch will fuss if one uses world writable settings in debugfs
files by passing S_IWUGO but not when passing S_IWOTH, S_IRWXUGO or S_IALLUGO.
This patch extends the check to catches all cases exporting world writable 
files

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

The patch was tested against a set of trivial test-cases:
t_file = debugfs_create_file("id", S_IWOTH, t_dir, NULL, &t_fops);
t_file = debugfs_create_file("id", S_IWUGO, t_dir, NULL, &t_fops);
t_file = debugfs_create_file("id", S_IRWXUGO, t_dir, NULL, &t_fops);
t_file = debugfs_create_file("id", S_IALLUGO, t_dir, NULL, &t_fops);
and
t_file = debugfs_create_file("id", S_IWOTH | S_IXOTH, t_dir, NULL, &t_fops);

Patch is against 4.0-rc3 (localversion-next is -next-20150313)

 scripts/checkpatch.pl |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 6b79beb..5def21c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5356,8 +5356,14 @@ sub process {
 			}
 		}
 
-		if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
-		    $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
+		if ($line =~ /debugfs_create_file.*S_IWOTH/ ||
+		    $line =~ /debugfs_create_file.*S_IWUGO/ ||
+		    $line =~ /debugfs_create_file.*S_IRWXUGO/ ||
+		    $line =~ /debugfs_create_file.*S_IALLUGO/ ||
+		    $line =~ /DEVICE_ATTR.*S_IWOTH/ ||
+		    $line =~ /DEVICE_ATTR.*S_IWUGO/ ||
+		    $line =~ /DEVICE_ATTR.*S_IRWXUGO/ ||
+		    $line =~ /DEVICE_ATTR.*S_IALLUGO/ ) {
 			WARN("EXPORTED_WORLD_WRITABLE",
 			     "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
 		}
-- 
1.7.10.4

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