40585 2021-07-27 13:45:13 +0300 lightdm: use-after-free, потенциально приводящий к прекращению работы функции запуска "предыдущей сессии" 2021-08-20 03:33:10 +0300 1 1 4 Development Sisyphus lightdm unstable x86_64 Linux CLOSED FIXED https://bugzilla.altlinux.org/show_bug.cgi?id=30329 regression P5 normal --- 1 darktemplaralt manowar antohami golubevan ildar manowar qa-sisyphus oldest_to_newest 200933 0 9538 darktemplaralt 2021-07-27 13:45:13 +0300 Created attachment 9538 lightdm.gdb.log При попытке запустить lightdm-kde-greeter, адаптированный под qt5/kde5, при запуске с предыдущей сессией, запуск не работает. Воспроизведение: 1) Взять K Workstation, обновить до Сизифа и поставить lightdm и lightdm-kde-greeter. Сейчас lightdm-kde-greeter - work in progress, текущее состояние сейчас можно взять отсюда: http://git.altlinux.org/people/darktemplar/packages/?p=lightdm-kde-greeter.git;a=shortlog;h=refs/heads/sisyphus 2) Выставить в конфиге lightdm-kde-greeter тему classic: $ cat /etc/lightdm/lightdm-kde-greeter.conf [greeter] theme-name=classic 3) Запустить lightdm, убедиться что в качестве greeter используется lightdm-kde-greeter или же заставить использовать его. 4) Убедиться что в сессии выбран пункт "Previously Used Session". Он обычно выбран по-умолчанию. 5) Залогиниться в сессию. Может потребоваться сделать это несколько раз одним и тем же пользователем для заполнения и использования файла ~/.dmrc. Результат: Пользовательская сессию не запускается. В логе /var/log/lightdm/lightdm.log подобные записи: [+1139.38s] DEBUG: Greeter requests default session [+1148.40s] CRITICAL: g_variant_new_string: assertion 'g_utf8_validate (string, -1, NULL)' failed [+1148.40s] CRITICAL: g_dbus_connection_call_sync_internal: assertion 'G_IS_DBUS_CONNECTION (connection)' failed [+1153.94s] DEBUG: Writing /home/test/.dmrc [+1424.62s] DEBUG: Seat seat0: Failed to find session configuration �\���U [+1424.62s] DEBUG: Seat seat0: Can't find session '�\���U' [+2667.24s] DEBUG: Got signal 15 from process 1 Ожидаемый результат: Запуск предыдущей пользовательской сессии. Дополнительная информация: Покопался с gdb и нашёл проблему. Лог gdb, почищенный от большей части ненужного, прикреплён. Судя по результатам, патчем lightdm-1.30.0-reread-dmrc-alt.patch внесена ошибка типа "use after free": когда прилетает session_name == NULL, session_name берётся из данных, хранящихся в "user", однако затем из-за форсированного вызова load_dmrc эти данные освобождаются и выделяются/считываются/наполняются снова, однако в session_name остаётся старый невалидный указатель. Дальше всё работает плохо. В p9 воспроизвести не удалось. Либо везёт, либо что-то ещё блокирует проявление ошибки. Прошу откатить патч lightdm-1.30.0-reread-dmrc-alt.patch для исправления проблемы. 201788 1 darktemplaralt 2021-08-18 11:45:21 +0300 ping 201789 2 manowar 2021-08-18 12:06:37 +0300 А на что откатить-то? На предыдущую версию или совсем его убрать? 201790 3 darktemplaralt 2021-08-18 12:17:35 +0300 (Ответ для manowar@altlinux.org на комментарий #2) > А на что откатить-то? На предыдущую версию или совсем его убрать? Это как Вы решите, просто отрывать патч или как-то его переделывать/переосмыслять. Просто отрывание патча вернёт связанную багу #30329. Кстати, lightdm-kde-greeter уже вернулся в Сизиф. 201872 4 repository-robot 2021-08-20 03:33:10 +0300 lightdm-1.30.0-alt15 -> sisyphus: Fri Aug 20 2021 Paul Wolneykien <manowar@altlinux> 1.30.0-alt15 - Revoke the "reread-dmrc" patch (closes: 40585). - ALTBUG 30329 should now be reopened. 9538 2021-07-27 13:45:13 +0300 2021-07-27 13:45:13 +0300 lightdm.gdb.log lightdm.gdb.log text/x-log 17161 darktemplaralt KGdkYikgYnJlYWsgZ192YXJpYW50X25ld19zdHJpbmcKQnJlYWtwb2ludCAxIGF0IDB4N2ZjZmI4 OTg5ZDQzOiBmaWxlIC4uL2dsaWIvZ3ZhcmlhbnQuYywgbGluZSAxMjYxLgooZ2RiKSBicmVhayBn cmVldGVyX3N0YXJ0X3Nlc3Npb25fY2IKQnJlYWtwb2ludCAyIGF0IDB4NTYxMzJiZTY0YmI0OiBm aWxlIHNlYXQuYywgbGluZSAxMTg0LgooZ2RiKSBjCkNvbnRpbnVpbmcuCltUaHJlYWQgMHg3ZmNm YjczOTI2NDAgKExXUCAzMDY0NikgZXhpdGVkXQpbRGV0YWNoaW5nIGFmdGVyIGZvcmsgZnJvbSBj aGlsZCBwcm9jZXNzIDMwNzA5XQoKVGhyZWFkIDEgImxpZ2h0ZG0iIGhpdCBCcmVha3BvaW50IDIs IGdyZWV0ZXJfc3RhcnRfc2Vzc2lvbl9jYiAoZ3JlZXRlcj0weDU2MTMyZDA5MjQ2MCwgdHlwZT1T 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