Re: /proc/timer_list and weird behavior with dropbear

From: Nathan Zimmer
Date: Fri Jul 19 2013 - 11:45:24 EST


On 07/19/2013 10:28 AM, Holger Hans Peter Freyther wrote:
Dear Nathan,

I am currently upgrading a kernel for a TI Davinci DM644x based design
from Linux 3.2 to Linux 3.10.1. I have a funny re-producible issue that
goes away by reverting b3956a896ea57f25cacd74708b8fab611543a81d.

The dropbear sshd will open several files after accepting a connection to
generate some entropy. The "/proc/timer_list" file is part of that[1].
It will open that file and will try to read until the end of the file, but
most of the time this end never comes. According to strace the read on the
fd will always return 2048. I have attached the testcase I am using to
re-produce the issue.

Can this be re-produced by anyone else?

holger



[1] https://secure.ucc.asn.au/hg/dropbear/file/028fa77f952f/random.c#l204

I hadn't noticed anything.
Let me try your program and see what I may have missed.
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