Red Hat Bugzilla – Bug 56829
lastcomm doesn't seem to understand 32-bit UIDs
Last modified: 2008-05-01 11:38:01 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:0.9.2) Gecko/20011002 Netscape6/6.1 Description of problem: We use process accounting. The report generated by lastcomm does not seem to understand 32-bit UIDs. Instead we are getting the low order 16-bits of the UID displayed. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1.Enable process accounting and install the psacct RPM 2.Create a user with a UID greater than 64k (in my example, cpenney -> 637911) 3.Execute some commands (in my example, /sbin/ifconfig) 3.Run lastcomm Actual Results: % lastcomm ifconfig 48087 stdin 0.00 secs Wed Nov 28 10:26 Expected Results: % lastcomm ifconfig cpenney stdin 0.00 secs Wed Nov 28 10:26 Additional info: My UID in hex is 9BBD7. The UID it shows is BBD7 in hex so it's obviously stripping off the top 16-bits of the UID. I'm not sure if this is an issue with the psacct utilities or the process accounting code in the kernel. I tried doing some searching, but to no avail.
This is not a bug in lastcomm not psacct. The kernel process accounting features do not support 32bit UID at all. As such, it is more of a lack of a feature than a bug. I discovered this while troubleshooting other bugs in lastcomm.
have looked into adding support for this in a compatible manner and have made a kernel patch adding 32bit uid/gid support. I am currently working on userland support as well. *** This bug has been marked as a duplicate of 62481 ***