[ipxe-devel] Receiving http://ipxe.org/3c00e183 error after upgrade

Michael Brown mcb30 at ipxe.org
Thu Aug 20 13:43:18 UTC 2020

On 20/08/2020 10:54, Dentcho Bankov wrote:
> I’ve just pulled the latest iPXE code (after more than a couple of 
> years) and started getting a http://ipxe.org/3c00e183 error when trying 
> to boot over HTTPS.
> Investigating a bit revealed that in my iPXE binary the asn1_algorithms 
> link table entries are offset by 48 bytes while the size of the asn1 
> _algorithm struct is 40 bytes so the ‘for_each_table_entry ( algorithm, 
> ASN1_ALGORITHMS )’ doesn’t cycle over the asn1_algorithms in the link 
> table correctly.
> I tried adding a dummy field of 8 bytes to the asn1_algortihm struct 
> which resolved the above error but then I started receiving 
> http://ipxe.org/420c6095 so I suspect I’m not building iPXE correctly.
> Could you please let me know if somebody else had observed a similar 
> problem lately and what may be causing it (I suspect this may be related 
> to some alignment/padding misconfiguration but don’t know how this is 
> controlled).

Interesting.  Which compiler are you using?

We've had previous issues with icc adding unexpected packing, but I have 
not seen this problem with gcc.



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