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#!/usr/bin/env python
# Copyright (c) Sasha Goldshtein
# Licensed under the Apache License, Version 2.0 (the "License")
import os
import subprocess
from bcc import SymbolCache, BPF
from unittest import main, TestCase
from utils import mayFail
class TestKSyms(TestCase):
def grab_sym(self):
address = ""
aliases = []
# Grab the first symbol in kallsyms that has type 't' or 'T'.
# Also, find all aliases of this symbol which are identifiable
# by the same address.
with open("/proc/kallsyms", "rb") as f:
for line in f:
# Extract the first 3 columns only. The 4th column
# containing the module name may not exist for all
# symbols.
(addr, t, name) = line.strip().split()[:3]
if t == b"t" or t == b"T":
if not address:
address = addr
if addr == address:
aliases.append(name)
# Return all aliases of the first symbol.
return (address, aliases)
def test_ksymname(self):
sym = BPF.ksymname(b"__kmalloc")
self.assertIsNotNone(sym)
self.assertNotEqual(sym, 0)
def test_ksym(self):
(addr, aliases) = self.grab_sym()
sym = BPF.ksym(int(addr, 16))
found = sym in aliases
self.assertTrue(found)
class Harness(TestCase):
def setUp(self):
self.build_command()
subprocess.check_output('objcopy --only-keep-debug dummy dummy.debug'
.split())
self.debug_command()
subprocess.check_output('strip dummy'.split())
self.process = subprocess.Popen('./dummy', stdout=subprocess.PIPE)
# The process prints out the address of some symbol, which we then
# try to resolve in the test.
self.addr = int(self.process.stdout.readline().strip(), 16)
self.syms = SymbolCache(self.process.pid)
def tearDown(self):
self.process.kill()
self.process.wait()
self.process.stdout.close()
self.process = None
def resolve_addr(self):
sym, offset, module = self.syms.resolve(self.addr, False)
self.assertEqual(sym, self.mangled_name)
self.assertEqual(offset, 0)
self.assertTrue(module[-5:] == b'dummy')
sym, offset, module = self.syms.resolve(self.addr, True)
self.assertEqual(sym, b'some_namespace::some_function(int, int)')
self.assertEqual(offset, 0)
self.assertTrue(module[-5:] == b'dummy')
def resolve_name(self):
script_dir = os.path.dirname(os.path.realpath(__file__).encode("utf8"))
addr = self.syms.resolve_name(os.path.join(script_dir, b'dummy'),
self.mangled_name)
self.assertEqual(addr, self.addr)
pass
class TestDebuglink(Harness):
def build_command(self):
subprocess.check_output('g++ -o dummy dummy.cc'.split())
lines = subprocess.check_output('nm dummy'.split()).splitlines()
for line in lines:
if b"some_function" in line:
self.mangled_name = line.split(b' ')[2]
break
self.assertTrue(self.mangled_name)
def debug_command(self):
subprocess.check_output('objcopy --add-gnu-debuglink=dummy.debug dummy'
.split())
def tearDown(self):
super(TestDebuglink, self).tearDown()
subprocess.check_output('rm dummy dummy.debug'.split())
def test_resolve_addr(self):
self.resolve_addr()
@mayFail("This fails on github actions environment, and needs to be fixed")
def test_resolve_name(self):
self.resolve_name()
class TestBuildid(Harness):
def build_command(self):
subprocess.check_output(('g++ -o dummy -Xlinker ' + \
'--build-id=0x123456789abcdef0123456789abcdef012345678 dummy.cc')
.split())
lines = subprocess.check_output('nm dummy'.split()).splitlines()
for line in lines:
if b"some_function" in line:
self.mangled_name = line.split(b' ')[2]
break
self.assertTrue(self.mangled_name)
def debug_command(self):
subprocess.check_output('mkdir -p /usr/lib/debug/.build-id/12'.split())
subprocess.check_output(('mv dummy.debug /usr/lib/debug/.build-id' + \
'/12/3456789abcdef0123456789abcdef012345678.debug').split())
def tearDown(self):
super(TestBuildid, self).tearDown()
subprocess.check_output('rm dummy'.split())
subprocess.check_output(('rm /usr/lib/debug/.build-id/12' +
'/3456789abcdef0123456789abcdef012345678.debug').split())
def test_resolve_name(self):
self.resolve_addr()
@mayFail("This fails on github actions environment, and needs to be fixed")
def test_resolve_addr(self):
self.resolve_name()
if __name__ == "__main__":
main()
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