Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.bugs.dist > #1253825

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

Show all headers | View raw

Control: tag -1 + patch

On Wed, Jul 23, 2025 at 10:31:47PM +0100, Andrew Bower wrote:
> On Mon, Jun 30, 2025 at 11:36:59PM +0100, Andrew Bower wrote:
[...] 
> However, we are unfortunately not out of the woods: elogind is running
> on this host and root is able to see the sessions. So is 'who' as
> non-root with the newly libsystemd-ised coreutils:

Done a bit more digging. A number of issues - sorry, I don't have time
to split them out into appropriate bugs right now. The first is
definitely for procps:

1. Unitialised 'sessions' variable is a a bug on all systems which leads
   to a segfault on some. I'm now tagging this bug as having a patch.

2. elogind not being queried. Is this an elogind issue? Should it give a
   different answer to sd_booted() or is this the wrong way to detect the
   seat management capability? 'who' does not have this problem - it
   somehow queries elogind anyway.

procps then resorts to utmp.

3. Some (vc) sessions not reported unless running as root, but the non-root
   user could read utmp. 'who' does not have this problem but then it
   probably didn't resort to reading utmp (see 2 above).

4. Virtual console sessions reported as pts/# instead of tty# in utmp - I
   guess we can blame login for that but we're off on a tangent now: 1-3 are
   more important to sort out.

Back to linux.debian.bugs.dist | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

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

csiph-web