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authorNĂ­colas F. R. A. Prado <nfraprado@collabora.com>2023-11-07 17:55:28 -0500
committerRob Herring <robh@kernel.org>2023-11-09 11:56:39 -0600
commit8f51593cdcab82fb23ef2e1a0010b2e6f99aae02 (patch)
tree92c23b422aa0d1af6733db76cadeccca7e6faa55
parentfe612629746cf5cc7040529f780d46929605d0a6 (diff)
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: b6acf8073517 ("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: "NĂ­colas 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>
-rwxr-xr-xscripts/dtc/dt-extract-compatibles14
1 files changed, 12 insertions, 2 deletions
diff --git a/scripts/dtc/dt-extract-compatibles b/scripts/dtc/dt-extract-compatibles
index bd07477dd144..5ffb2364409b 100755
--- a/scripts/dtc/dt-extract-compatibles
+++ b/scripts/dtc/dt-extract-compatibles
@@ -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