linux-kernel - PROBLEM: with daemon.c after y2038 on 32-bits Kernel

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Message-ID: <trinity-3d43505a-735f-402f-8b14-90a32b289a0c-1652773898430@3c-app-mailcom-bs07>
Date:   Tue, 17 May 2022 09:51:38 +0200
From:   Arnaud Panaïotis <arnaud.panaiotis@....fr>
To:     linux-kernel@...r.kernel.org
Subject: PROBLEM: with daemon.c after y2038 on 32-bits Kernel

Hello,

I'm working for a client to generate embedded 32-bits Linux Kernel working after y2038 issue.

I generated a 5.15 Kernel thought Buildroot with Coreutils 9.0, GCC 11.2.0, Binutils 2.37, Glibc 2.34-9 and CFLAGS  -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64  -D_TIME_BITS=64.
 
I encounter an issue while working with OpenSSH (I initially contacted them before).
 
After 2038, /usr/sbin/sshd does not create an error but it child does generate this one:
daemon() failed: Value too large for defined data type
 
This happend here in sshd.c: 

2019         /*
2020          * If not in debugging mode, not started from inetd and not already
2021          * daemonized (eg re-exec via SIGHUP), disconnect from the controlling
2022          * terminal, and fork.  The original process exits.
2023          */
2024         already_daemon = daemonized();
2025         if (!(debug_flag || inetd_flag || no_daemon_flag || already_daemon)) {
2026
2027                 if (daemon(0, 0) == -1)
2028                         fatal("daemon() failed: %.200s", strerror(errno));

To reproduce: 

# date -s "2040-05-12"
# hwclock --systohc
# reboot
# /usr/sbin/sshd

Note this error occurs only after the reboot, and setting a date before 2038 also require a reboot to remove the error.
 
strace and gdb trace linked.
 
Let me know if you need additional information.
 
Best regards,
 
PS: I had a similar issue with binutils cp
Discussion : debbugs.gnu.org/cgi/bugreport.cgi?bug=55023
Fix : sourceware.org/bugzilla/show_bug.cgi?id=29097
 
--
Arnaud PANAÏOTIS | Lead Developer Freelance
+33 6 34 82 12 62 | arnaud.panaiotis@....fr

18 place Jean Moulin - 38000 Grenoble
APsudo - www.panaiotis.fr
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