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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
import os
from pathlib import Path
import tempfile
from drgn import (
DebugInfoOptions,
KmodSearchMethod,
MainModule,
Program,
RelocatableModule,
)
from drgn.helpers.linux.module import find_module
from tests import modifyenv
from tests.linux_kernel import LinuxKernelTestCase, skip_unless_have_test_kmod
def iter_proc_modules():
try:
f = open("/proc/modules", "r")
except FileNotFoundError:
return
with f:
for line in f:
tokens = line.split()
yield tokens[0], int(tokens[5], 16)
class TestDebugInfo(LinuxKernelTestCase):
def test_debug_info(self):
# This is actually two test cases squished into one to avoid indexing
# vmlinux another time.
prog = Program()
prog.set_kernel()
prog.set_enabled_debug_info_finders([])
with self.subTest("vmlinux_no_build_id"):
for module, _ in prog.loaded_modules():
if isinstance(module, MainModule):
module.build_id = None
break
else:
self.fail("main module not found")
prog.load_debug_info([self.prog.main_module().debug_file_path])
self.assertEqual(
prog.main_module().debug_file_path,
self.prog.main_module().debug_file_path,
)
with self.subTest("kmod_walk"), tempfile.TemporaryDirectory() as temp_dir:
temp_dir = Path(temp_dir)
found_modules = set()
for i, module in enumerate(self.prog.modules()):
if isinstance(module, RelocatableModule) and module.debug_file_path:
found_modules.add(module.name)
link = temp_dir / str(i) / (module.name + ".ko")
link.parent.mkdir()
link.symlink_to(module.debug_file_path)
modules = [
module
for module, _ in prog.loaded_modules()
if module.name in found_modules
]
prog.find_standard_debug_info(
modules,
options=DebugInfoOptions(
kernel_directories=(temp_dir,), try_kmod=KmodSearchMethod.WALK
),
)
for module in modules:
with self.subTest(module=module.name):
self.assertIsNotNone(module.debug_file_path)
class TestModule(LinuxKernelTestCase):
def test_loaded_modules(self):
expected = [("kernel", None), *iter_proc_modules()]
loaded_modules = []
for module, _ in self.prog.loaded_modules():
if isinstance(module, RelocatableModule):
loaded_modules.append((module.name, module.address))
else:
loaded_modules.append((module.name, None))
self.assertCountEqual(loaded_modules, expected)
@skip_unless_have_test_kmod
def test_find(self):
self.assertEqual(self.prog.main_module().name, "kernel")
for name, address in iter_proc_modules():
if name == "drgn_test":
self.assertEqual(
self.prog.relocatable_module(name, address).name, "drgn_test"
)
break
else:
self.fail("test module not found")
@skip_unless_have_test_kmod
def test_find_by_obj(self):
for module in self.prog.modules():
if module.name == "drgn_test":
break
else:
self.fail("test module not found")
module_obj = find_module(self.prog, "drgn_test")
self.assertEqual(self.prog.linux_kernel_loadable_module(module_obj), module)
self.assertEqual(
self.prog.linux_kernel_loadable_module(module_obj, create=True), module
)
def test_no_sys_module(self):
# Test that we get the same modules with and without using /sys/module.
def module_dict(prog):
return {
(module.name, module.address): (
module.address_range,
module.build_id,
dict(module.section_addresses),
)
for module, _ in prog.loaded_modules()
if isinstance(module, RelocatableModule)
}
use_sys_module = int(os.environ.get("DRGN_USE_SYS_MODULE", "1")) != 0
with modifyenv({"DRGN_USE_SYS_MODULE": str(int(not use_sys_module))}):
prog = Program()
prog.set_kernel()
if use_sys_module:
with_sys_module = module_dict(self.prog)
without_sys_module = module_dict(prog)
else:
with_sys_module = module_dict(prog)
without_sys_module = module_dict(self.prog)
self.assertEqual(with_sys_module, without_sys_module)
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