[MBT] new ticket for pkg kernel "BSD Process accounting on Linux is broken if you have UIDs and/or GIDs over 65536(2^16)"

[bugs at pld.org.pl]

Date: 2003-04-30 23:28:45+02	Author: Tomasz K?oczko (kloczek) <kloczek at rudy.mif.pg.gda.pl> 
Title:         BSD Process accounting on Linux is broken if you have UIDs and/or GIDs over 65536(2^16)
Ticket ID:     #652
Ticket URL:    http://bugs.pld.org.pl/?bug=652
Package:       kernel-2.4.20
Distribution:  
Category:      improve request
Current state: opened
Text:

From: http://www-rcf.usc.edu/~garrick/32bit-pacct-howto.txt

The 2.4.x series of Linux kernels started using a 32 bit uid and gid which
raised the maximum number of users from 65536(2^16) to 4294967296(2^32).  
Unfortunately, the BSD process accounting system in Linux was not likewise
upgraded so that the binary accounting files would remain compatible.  This
might be fine for users that don't have more than 65 thousand users, but it
isn't suitable for those of us with a large user base.

Fortunately, this is really easy to fix.  The process accounting (pacct)
binary file format includes 10 extra bytes at the end for future reserved
use.  Guess what?  Now is the future, let's use it.  We'll simply put two
32bit values to store the uid and gid in that space; using up 8 of those 10
bytes.  We'll maintain binary compatibility with the current userspace tools,
but we'll need to modify our pacct user tools to read those additional values.

For the impatient:
   cd /usr/src/linux-<version> (or wherever your kernel source is located)
   lynx -source http://www-rcf.usc.edu/~garrick/linux-acct-uid32.patch | patch -p1
   cd /usr/include/sys
   lynx -source http://www-rcf.usc.edu/~garrick/acct.h-uid32.patch | patch
   rpm --rebuild http://www-rcf.usc.edu/~garrick/psacct-6.3.2-9uid32.src.rpm
   and build your kernel as usual and install the new psacct rpm.

   Those patches add two new members to struct acct: ac_uid32 and ac_gid32.  They
   will always have the correct uid and gid values.  It would be easy enough to
   replace all occurances of ac_uid/ac_gid in the psacct utils, but we'll want to
   employ a little trickery to maintain backwards compatibility with pacct files
   written with pre-patched kernels