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Bug 4479 - File lastlog becomes huge when using large uid's
File lastlog becomes huge when using large uid's
Product: Red Hat Linux
Classification: Retired
Component: shadow-utils (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Bernhard Rosenkraenzer
Depends On:
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Reported: 1999-08-11 14:00 EDT by Jos Vos
Modified: 2008-05-01 11:37 EDT (History)
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,
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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