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([2804:1b3:a7c0:a715:4c3a:174b:ee6:b242]) by smtp.gmail.com with ESMTPSA id y13-20020a17090322cd00b001c3f7fd1ef7sm3783556plg.12.2023.11.09.09.01.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Nov 2023 09:01:24 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Thorsten Kukuk Subject: [PATCH 0/3] Make accounting database no-op Date: Thu, 9 Nov 2023 14:01:16 -0300 Message-Id: <20231109170119.1664204-1-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patch=linaro.org@sourceware.org The utmp/utmpx interface is the missing piece to enable full y2038 support on glibc, and even some 64 bit architectures are not fully compatible (the ones that define __WORDSIZE_TIME64_COMPAT32). There are multiple issues regarding 64 bit time_t support [1] [2] [3] and a potential fix would either require breaking the ABI (as I suggested when I started the y2038 and decided to put it aside due to the required work) or use a different encoding for the timeval structure (suggested by Andreas [4]). The current implementation has some design flaws that are not straightforward to fix without a complete rewrite [5] [6]. A utmp/utmpx daemon will also require a security model and support for multiple different IPC systems, which is out of scope for glibc. Also, this is what systemd-logind essentially does so it would be a double effort (the pt_chwon daemon is a remind that it is not easy to get this right). This patchset removes all accounting database implementation and makes the function no-op and/or return an error. There is not much gain in moving the current implementation to compat symbols, it does not solve the 64 bit time_t support for old binaries, nor it is guaranteed that the UTMP/UTMPX files will exist in future environments. Keeping a compat symbol also does not help with some design flags like BZ#24492, which I am not sure why it did not raise more security concerns since it is easy to create DoS attacks by preventing utmp updates. The utmp.h/utmpx.h headers are kept as is, even though glibc does not use its definition. The related path _PATH_UTMP/_PATH_WTMP/etc. points to invalid paths, and stub link warnings are added to the affected symbols. [1] https://sourceware.org/bugzilla/show_bug.cgi?id=28146 [2] https://sourceware.org/bugzilla/show_bug.cgi?id=17470 [3] https://sourceware.org/bugzilla/show_bug.cgi?id=30701 [4] https://sourceware.org/pipermail/libc-alpha/2023-August/150661.html Adhemerval Zanella (3): sysdeps: Re-flow and sort multiline gnu/Makefile definitions login: Remove utmp fallback for getlogin login: Make user accounting database no-op NEWS | 18 + include/set-freeres.h | 3 - include/unistd.h | 3 - include/utmp.h | 29 - login/Makefile | 9 +- login/endutxent.c | 25 - login/getlogin.c | 13 +- login/getutent.c | 28 +- login/getutent_r.c | 45 +- login/getutid.c | 25 +- login/getutid_r.c | 34 +- login/getutline.c | 27 +- login/getutline_r.c | 21 +- login/getutmp.c | 12 +- login/getutmpx.c | 34 -- login/getutxent.c | 25 - login/getutxid.c | 25 - login/getutxline.c | 25 - login/login.c | 118 +--- login/logout.c | 44 +- login/logwtmp.c | 22 +- login/programs/utmpdump.c | 62 --- login/pututxline.c | 25 - login/setutxent.c | 25 - login/tst-pututxline-cache.c | 193 ------- login/tst-pututxline-lockfail.c | 176 ------ login/tst-updwtmpx.c | 112 ---- login/tst-utmp.c | 377 ------------- login/tst-utmpx.c | 2 - login/updwtmp.c | 13 +- login/updwtmpx.c | 25 - login/utmp-private.h | 44 -- login/utmp_file.c | 506 ------------------ login/utmpname.c | 57 +- login/utmpxname.c | 25 - malloc/set-freeres.c | 6 - manual/users.texi | 446 ++------------- sysdeps/generic/paths.h | 6 +- sysdeps/gnu/Makefile | 43 +- sysdeps/gnu/getutmp.c | 34 -- sysdeps/gnu/getutmpx.c | 1 - sysdeps/gnu/updwtmp.c | 30 -- sysdeps/gnu/utmp_file.c | 30 -- sysdeps/mach/hurd/getlogin.c | 35 -- sysdeps/unix/getlogin.c | 81 --- sysdeps/unix/getlogin_r.c | 103 ---- sysdeps/unix/sysv/linux/getlogin.c | 39 -- sysdeps/unix/sysv/linux/getlogin_r.c | 34 +- sysdeps/unix/sysv/linux/paths.h | 4 +- sysdeps/unix/sysv/linux/s390/s390-32/Makefile | 4 - .../unix/sysv/linux/s390/s390-32/getutent.c | 19 +- .../unix/sysv/linux/s390/s390-32/getutent_r.c | 11 +- .../unix/sysv/linux/s390/s390-32/getutid.c | 4 +- .../unix/sysv/linux/s390/s390-32/getutid_r.c | 2 +- .../unix/sysv/linux/s390/s390-32/getutline.c | 4 +- .../sysv/linux/s390/s390-32/getutline_r.c | 2 +- .../unix/sysv/linux/s390/s390-32/getutmp.c | 20 +- .../unix/sysv/linux/s390/s390-32/getutxent.c | 29 - .../unix/sysv/linux/s390/s390-32/getutxid.c | 29 - .../unix/sysv/linux/s390/s390-32/getutxline.c | 29 - sysdeps/unix/sysv/linux/s390/s390-32/login.c | 1 + .../unix/sysv/linux/s390/s390-32/login32.c | 37 -- .../unix/sysv/linux/s390/s390-32/pututxline.c | 29 - .../unix/sysv/linux/s390/s390-32/updwtmp.c | 6 +- .../unix/sysv/linux/s390/s390-32/updwtmpx.c | 29 - .../sysv/linux/s390/s390-32/utmp-convert.h | 85 --- sysdeps/unix/sysv/linux/s390/s390-32/utmp32.c | 183 ------- sysdeps/unix/sysv/linux/s390/s390-32/utmp32.h | 51 -- .../sysv/linux/s390/s390-32/utmpx-convert.h | 84 --- .../unix/sysv/linux/s390/s390-32/utmpx32.c | 138 ----- .../unix/sysv/linux/s390/s390-32/utmpx32.h | 59 -- sysdeps/unix/sysv/linux/utmp_file.c | 36 -- 72 files changed, 212 insertions(+), 3798 deletions(-) delete mode 100644 login/endutxent.c delete mode 100644 login/getutmpx.c delete mode 100644 login/getutxent.c delete mode 100644 login/getutxid.c delete mode 100644 login/getutxline.c delete mode 100644 login/programs/utmpdump.c delete mode 100644 login/pututxline.c delete mode 100644 login/setutxent.c delete mode 100644 login/tst-pututxline-cache.c delete mode 100644 login/tst-pututxline-lockfail.c delete mode 100644 login/tst-updwtmpx.c delete mode 100644 login/tst-utmp.c delete mode 100644 login/tst-utmpx.c delete mode 100644 login/updwtmpx.c delete mode 100644 login/utmp-private.h delete mode 100644 login/utmp_file.c delete mode 100644 login/utmpxname.c delete mode 100644 sysdeps/gnu/getutmp.c delete mode 100644 sysdeps/gnu/getutmpx.c delete mode 100644 sysdeps/gnu/updwtmp.c delete mode 100644 sysdeps/gnu/utmp_file.c delete mode 100644 sysdeps/mach/hurd/getlogin.c delete mode 100644 sysdeps/unix/getlogin.c delete mode 100644 sysdeps/unix/getlogin_r.c delete mode 100644 sysdeps/unix/sysv/linux/getlogin.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/getutxent.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/getutxid.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/getutxline.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/login32.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/pututxline.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/updwtmpx.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/utmp-convert.h delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/utmp32.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/utmp32.h delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/utmpx-convert.h delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/utmpx32.c delete mode 100644 sysdeps/unix/sysv/linux/s390/s390-32/utmpx32.h delete mode 100644 sysdeps/unix/sysv/linux/utmp_file.c