dt: dt-extract-compatibles: Don't follow symlinks when walking tree

The iglob function, which we use to find C source files in the kernel
tree, always follows symbolic links. This can cause unintentional
recursions whenever a symbolic link points to a parent directory. A
common scenario is building the kernel with the output set to a
directory inside the kernel tree, which will contain such a symlink.

Instead of using the iglob function, use os.walk to traverse the
directory tree, which by default doesn't follow symbolic links. fnmatch
is then used to match the glob on the filename, as well as ignore hidden
files (which were ignored by default with iglob).

This approach runs just as fast as using iglob.

Fixes: b6acf80735 ("dt: Add a check for undocumented compatible strings in kernel")
Reported-by: Aishwarya TCV <aishwarya.tcv@arm.com>
Closes: https://lore.kernel.org/all/e90cb52f-d55b-d3ba-3933-6cc7b43fcfbc@arm.com
Signed-off-by: "Nícolas F. R. A. Prado" <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20231107225624.9811-1-nfraprado@collabora.com
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Nícolas F. R. A. Prado 2023-11-07 17:55:28 -05:00 committed by Rob Herring
parent fe61262974
commit 8f51593cdc
1 changed files with 12 additions and 2 deletions

View File

@ -1,8 +1,8 @@
#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-only
import fnmatch
import os
import glob
import re
import argparse
@ -81,10 +81,20 @@ def print_compat(filename, compatibles):
else:
print(*compatibles, sep='\n')
def glob_without_symlinks(root, glob):
for path, dirs, files in os.walk(root):
# Ignore hidden directories
for d in dirs:
if fnmatch.fnmatch(d, ".*"):
dirs.remove(d)
for f in files:
if fnmatch.fnmatch(f, glob):
yield os.path.join(path, f)
def files_to_parse(path_args):
for f in path_args:
if os.path.isdir(f):
for filename in glob.iglob(f + "/**/*.c", recursive=True):
for filename in glob_without_symlinks(f, "*.c"):
yield filename
else:
yield f