mirror of
https://github.com/FirebirdSQL/firebird-qa.git
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91 lines
4.4 KiB
Python
91 lines
4.4 KiB
Python
#coding:utf-8
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"""
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ID: issue-8168
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ISSUE: https://github.com/FirebirdSQL/firebird/issues/8168
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TITLE: Fetching from a scrollable cursor may overwrite user-specified buffer and corrupt memory
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DESCRIPTION:
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Engine did overwrite the user-specified buffer with four more bytes than expected that could corrupt the caller memory.
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Discussed between dimitr, pcisar and pzotov, see letters of 29-30 NOV 2021,
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subj: "firebird-driver & scrollable cursors // misc. tests, requested by dimitr"
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NOTES:
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[18.07.2024] pzotov
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1. ### ACHTUNG ###
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Old snapshots (before 5.0.0.890-aa847a7) must be checked with usage "--disable-db-cache" command switch for pytest!
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Otherwise one may FALSE failure (bugcheck) with:
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"internal Firebird consistency check (decompression overran buffer (179), file: sqz.cpp line: 293)"
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2. Initial problem related to cursor operation was found in 5.0.0.316 and result depends on CONNECTION PROTOCOL(!):
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1.1. For REMOTE protocol cur.fetch_first() raised "firebird.driver.types.DatabaseError: feature is not supported"
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1.2. For LOCAL protocol Python crashed with console output:
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==============
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Current thread 0x00004ad0 (most recent call first):
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File "C:/FBTESTING/qa/firebird-qa/tests/bugs/gh_7056_test.py", line 74 in test_1
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File "C:/Python3x/Lib/site-packages/_pytest/python.py", line 194 in pytest_pyfunc_call
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File "C:/Python3x/Lib/site-packages/pluggy/_callers.py", line 102 in _multicall
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...
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File "C:/Python3x/Lib/site-packages/_pytest/config/__init__.py", line 198 in console_main
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File "C:/Python3x/Scripts/pytest.exe/__main__.py", line 7 in <module>
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File "<frozen runpy>", line 88 in _run_code
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File "<frozen runpy>", line 198 in _run_module_as_main
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==============
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Problem with "firebird.driver.types.DatabaseError: feature is not supported" has been fixed in 5.0.0.320, commit:
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5a5a2992f78c1af9408091a0bd3fff50e0bc5d6a (26-nov-2021 09:11)
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"Better boundary checks, code unification, removed end-of-stream errors when fetching past EOF / beyond BOF (as per SQL spec)"
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Problem with Python crash did exist up to 5.0.0.325 (30-nov-2021) and has been fixed in 5.0.0.326-fd6bf8d (01-dec-2021 08:44)
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3. Problem appeared only for column with width = 32765 characters, thus DB charset must be single-byte, e.g. win1251 etc.
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Otherwise (with default charset = 'utf8') this test will fail with:
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"SQLSTATE = 54000 / ... or string truncation / -Implementation limit exceeded"
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4. Custom driver-config object must be used for DPB because TWO protocols are checked here: LOCAL and REMOTE.
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Checked on 6.0.0.396, 5.0.1.1440
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"""
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import pytest
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from firebird.qa import *
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from firebird.driver import driver_config, connect, NetProtocol, DatabaseError
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import re
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N_WIDTH = 32765
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init_script = f"""
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create table ts(id int primary key, s varchar({N_WIDTH}));
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insert into ts(id,s) values( 1, lpad('', {N_WIDTH}, 'A') );
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commit;
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"""
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db = db_factory(init=init_script, charset = 'win1251')
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act = python_act('db', substitutions=[('[ \t]+', ' ')])
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def strip_white(value):
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value = re.sub('(?m)^\\s+', '', value)
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return re.sub('(?m)\\s+$', '', value)
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@pytest.mark.scroll_cur
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@pytest.mark.version('>=5.0.0')
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def test_1(act: Action, capsys):
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srv_cfg = driver_config.register_server(name = 'test_srv_gh_7056', config = '')
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actual_out = expected_out = ''
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for protocol_name in ('local', 'remote'):
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db_cfg_name = f'tmp_7056_{protocol_name}'
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db_cfg_object = driver_config.register_database(name = db_cfg_name)
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db_cfg_object.server.value = srv_cfg.name
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db_cfg_object.protocol.value = None if protocol_name == 'local' else NetProtocol.INET
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db_cfg_object.database.value = str(act.db.db_path)
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success_msg = f'Protocol: {protocol_name} - COMPLETED.'
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expected_out += success_msg + '\n'
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with connect(db_cfg_name, user = act.db.user, password = act.db.password) as con:
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try:
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cur = con.cursor()
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cur.open('select id, s from ts order by id')
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cur.fetch_first()
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print(success_msg)
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except DatabaseError as e:
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print(e.__str__())
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actual_out += capsys.readouterr().out + '\n'
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assert expected_out != '' and strip_white(actual_out) == strip_white(expected_out)
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