When seekdir() Won't Seek to the Right Positi…

Contributed by
[url=http://undeadly.org/I%20don't%20work%20here.]sean[/url]
on Thu May 8 19:20:09 2008 (GMT)
from the and-another-bug-bites-the-dust dept.
Some bugs are so ornery that they remain hidden for a very long time.
There are some that happen in such weird edge cases that they go unexposed and are very hard to repeat.
Marc Balmer (mbalmer@)
investigated a bug
that was exposed by
Samba
. This bug had to do with a corner case with respect to the life of a directory listing. It seems to be the case that iterating through a directory (as provided by seekdir()/readdir()) can return invalid results when the directory is modified (specifically when items are removed) during the list iteration.
In Marc's personal blog, he
explains the bug
(and the solution) in better detail and notes how this bug has existed for far longer than OpenBSD has been around. I'm personally convinced I've seen this issue on some really high traffic OpenBSD and FreeBSD file servers but being a relative Luddite, blamed it on Samba (of which I'm not a huge fan but tolerate out of necessity).
Congratulations Marc on finding and squashing this beast.
As well, the other postings on
his blog
are equally good reading.


本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/4206/showart_681621.html

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