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[Qemu-devel] The TFTP server has the Sourcerer's Apprentice bug
From: |
H. Peter Anvin |
Subject: |
[Qemu-devel] The TFTP server has the Sourcerer's Apprentice bug |
Date: |
Sun, 02 Aug 2009 15:18:21 -0700 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 |
Hello,
I was investigating a failure to TFTP boot, and I found that the TFTP
server in Qemu has the Sourcerer's Apprentice bug (see RFC 1123, section
4.2.3.1. Specifically, it is *required* that the sending side:
a) MUST NOT retransmit in response to a duplicated ACK.
b) MUST retransmit based on timeouts.
(a) is trivial to fix, but (b) requires a little more knowledge of the
internals than I'm willing to devote my Sunday afternoon to fixing...
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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