Re: when checksums collide -- the saga of linux-2.6.37.2.tar.bz2


Robert P. J. Day
 

On Fri, 15 Jul 2011, Paul Eggleton wrote:

On Friday 15 July 2011 11:47:44 Robert P. J. Day wrote:
unsurprisingly, the fetch for the linux tarball still failed for the
same reason as before -- incorrect checksums. huh. i typically don't
expect to see that in a simple fetch. so check KERNELORG_MIRROR (http
site), *manually* download that tarball and, sure enough, its md5 and
sha256 sums are the (incorrect) ones that bitbake is reporting, which
don't match what's expected. how odd. (i verified this two
additional times, same result.)

just as a test, i edited the bitbake.conf and changed
KERNELORG_MIRROR to refer to the kernel ftp site, cleared out the
remnants of that fetch, re-ran it and ... success! huh? so the
tarball via http is broken, but the one via ftp is good? but it was
late, so i just threw up my hands and went to bed.

this morning, manually download both tarballs (ftp and http), check
their sums and ... they match! reset everything, go back to the
original http KERNELORG_MIRROR value and it's all good. what the heck
was *that* all about?
Do you still have the tarball with the bad md5sum? Can you diff the
contents? Or was it simply a case of the bad tarball being
truncated?
sadly, i tossed the "bad" tarball, but i do recall that when i just
tried to check the contents with "tar tvjf", it eventually reported
unexpected EOF -- yes, i might have mentioned that earlier. :-P

so i'll just chalk it up to cosmic rays or something, but i did try
the same thing three times and got the same error result all three
times. this morning, though, everything's back to normal. go figure.

rday

--

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Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca

Twitter: http://twitter.com/rpjday
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