[PATCH] selftest/minidebuginfo: extract files from tar archive using tarfile module

[PATCH] selftest/minidebuginfo: extract files from tar archive using tarfile module

[Alexander Kanavin]

From: Alexander Kanavin <alex@linutronix.de>

Python 3.14 added security checks around archive extraction, and by
default will refuse to handle symlinks with absolute paths. It's possible
to handle this using 'filter' argument, but it is not always available
in older Python versions on various host distributions we need to support,
so let's extract only the needed files directly using tarfile module.

busybox is itself a symlink to busybox.nosuid, so both are extracted.

[YOCTO #16195]

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
---
 meta/lib/oeqa/selftest/cases/minidebuginfo.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/meta/lib/oeqa/selftest/cases/minidebuginfo.py b/meta/lib/oeqa/selftest/cases/minidebuginfo.py
index a8923460f9..5f37522c32 100644
--- a/meta/lib/oeqa/selftest/cases/minidebuginfo.py
+++ b/meta/lib/oeqa/selftest/cases/minidebuginfo.py
@@ -6,7 +6,7 @@
 import os
 import subprocess
 import tempfile
-import shutil
+import tarfile
 
 from oeqa.core.decorator import OETestTag
 from oeqa.selftest.case import OESelftestTestCase
@@ -33,7 +33,10 @@ IMAGE_FSTYPES = "tar.bz2"
         # ".gnu_debugdata" which stores minidebuginfo.
         with tempfile.TemporaryDirectory(prefix = "unpackfs-") as unpackedfs:
             filename = os.path.join(bb_vars['DEPLOY_DIR_IMAGE'], "{}.tar.bz2".format(bb_vars['IMAGE_LINK_NAME']))
-            shutil.unpack_archive(filename, unpackedfs)
+            with tarfile.open(filename) as tar:
+                tar.extract("./bin/busybox", path=unpackedfs)
+                tar.extract("./bin/busybox.nosuid", path=unpackedfs)
+                tar.extract("./lib/libc.so.6", path=unpackedfs)
 
             r = runCmd([bb_vars['READELF'], "-W", "-S", os.path.join(unpackedfs, "bin", "busybox")],
                     native_sysroot = native_sysroot, target_sys = target_sys)
-- 
2.47.3