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Bug#1108549: procps: w segfaults when run as non-root user

From	Andrew Bower <andrew@bower.uk>
Newsgroups	linux.debian.bugs.dist
Subject	Bug#1108549: procps: w segfaults when run as non-root user
Date	2025-07-01 00:40 +0200
Message-ID	<L3vkl-ekRx-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Package: procps
Version: 2:4.0.4-8
Severity: important

Dear Maintainer,

Running 'w' as a non-root user on i386 segfaults:

$ gdb w
GNU gdb (Debian 16.3-1) 16.3
[...]
This GDB was configured as "i686-linux-gnu".
[...]
(gdb) run
Starting program: /usr/bin/w
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
 23:21:56 up 4 min,  0 users,  load average: 0.74, 1.06, 0.52
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU  WHAT

Program received signal SIGSEGV, Segmentation fault.
Download failed: Invalid argument.  Continuing without source file ./src/w.c.
0x00401979 in main (argc=<optimized out>, argv=<optimized out>) at src/w.c:1130
warning: 1130   src/w.c: No such file or directory

This reliably reproduces in the failing environment but not when run as root or
on an amd64 host with kernel 6.12.27-1.

Thanks!

-- System Information:
Debian Release: 13.0
  APT prefers testing
  APT policy: (700, 'testing'), (600, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 6.10.12-686 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages procps depends on:
ii  init-system-helpers  1.68
ii  libc6                2.41-9
ii  libncursesw6         6.5+20250216-2
ii  libproc2-0           2:4.0.4-8
ii  libsystemd0          257.6-1
ii  libtinfo6            6.5+20250216-2

Versions of packages procps recommends:
ii  linux-sysctl-defaults  4.12
ii  psmisc                 23.7-2

procps suggests no packages.

-- no debconf information

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Bug#1108549: procps: w segfaults when run as non-root user Andrew Bower <andrew@bower.uk> - 2025-07-01 00:40 +0200
  Bug#1108549: procps: w segfaults when run as non-root user Andrew Bower <andrew@bower.uk> - 2025-07-23 23:40 +0200
    Bug#1108549: procps: w segfaults when run as non-root user Andrew Bower <andrew@bower.uk> - 2025-07-24 20:20 +0200
  Bug#1108549: procps: w acts on value of uninit'd mem w/out systemd; poss segfault Andrew Bower <andrew@bower.uk> - 2025-07-29 01:00 +0200

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