Bug 1034

Summary:	log_subcmds causes issues on AIX
Product:	Sudo	Reporter:	bob.schwartz
Component:	Sudo	Assignee:	Todd C. Miller <Todd.Miller>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	low
Version:	1.9.11
Hardware:	IBM
OS:	AIX

Description bob.schwartz 2022-06-20 12:53:54 MDT

Using 1.9.11p2

with log_subcmds enabled, on AIX running the command "oslevel -s" fails.  

Error on 7.1:
sudo: recv: A connection with a remote socket was reset by that socket.
/usr/bin/oslevel[28]: /usr/bin/sort: 0403-006 Execute permission denied.

"rpm -q sudo" works but takes extremely long to return.  In a session without log_subcmds enabled it functions normally.

Similar messages happen on AIX 7.2

We have not seen similar behavior on Linux

Comment 1 Todd C. Miller 2022-06-20 15:26:13 MDT

I can reproduce this on AIX 7.1.  The recv failures are fixed by https://www.sudo.ws/repos/sudo/rev/8554618665a2 but it is still very slow.  Running "sudo oslevel -s" take close to a minute of real time.

Comment 2 Todd C. Miller 2022-06-20 16:32:59 MDT

Disabling Nagle's algorithm fixed the slowness, https://www.sudo.ws/repos/sudo/rev/11b129850ac1

Before:

-bash-5.0$ /bin/time /opt/sudo/bin/sudo oslevel -s
7100-03-00-0000

Real   50.38
User   1.42
System 2.52

After:

-bash-5.0$ /bin/time /opt/sudo/bin/sudo oslevel -s
7100-03-00-0000

Real   1.93
User   0.47
System 0.52

Comment 3 Todd C. Miller 2022-06-21 10:22:21 MDT

Fixed in sudo 1.9.11p3, out now.