Bug 4479 – File lastlog becomes huge when using large uid's

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Bug 4479 - File lastlog becomes huge when using large uid's

Summary:	File lastlog becomes huge when using large uid's

Status:	CLOSED WONTFIX

Aliases:	None

Product:	Red Hat Linux
Classification:	Retired
Component:	shadow-utils (Show other bugs)
Sub Component:
Version:	6.0
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
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Assigned To:	Bernhard Rosenkraenzer
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Reported:	1999-08-11 14:00 EDT by Jos Vos
Modified:	2008-05-01 11:37 EDT (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2000-05-23 04:19:35 EDT
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Description Jos Vos 1999-08-11 14:00:27 EDT

When using some high uid numbers (we use 50000 and up for
some special situations), the /var/log/lastlog file becomes
huge, 15+ MB in our case.  Is this according to specs?

On an old RHL 3.0.3 system, the file is only 100 KB, using
the same set of uid's.

Comment 1 Cristian Gafton 1999-09-22 23:17:59 EDT

The bug is in useradd from the shadow-utils.
Fixed in the internal devel tree

Comment 2 Cristian Gafton 1999-09-22 23:30:59 EDT

More information - the size of the struct lastlog is increased under
glibc to ~ 300 bytes. That means that fo 50k uids one would need
15000k space for the lastlog, so the result is expected.


------- Additional Comments From   09/23/99 04:08 -------
I didn't test this with 50k uids, only with about 1500 uids in total,
but some uid numbers were above 50000.  So the question is whether
unused uids also occupy a struct (which would be very bad behaviour,
IMHO).

Comment 3 Cristian Gafton 2000-05-22 11:52:59 EDT

assign to laroche

Comment 4 Bernhard Rosenkraenzer 2000-08-08 11:21:39 EDT

Can't be fixed without changing the internal format of /var/log/lastlog, which
we shouldn't do for interoperability reasons.

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