[bug #40363] TFTP: Files bigger than 63 MB generate "error: timeout reading `/boot/initrd'."

[Bernhard Übelacker]

URL:
  <http://savannah.gnu.org/bugs/?40363>

                 Summary: TFTP: Files bigger than 63 MB generate "error:
timeout reading `/boot/initrd'."
                 Project: GNU GRUB
            Submitted by: bernhardu
            Submitted on: Do 24 Okt 2013 15:10:34 GMT
                Category: Network
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Bazaar - trunk
         Reproducibility: Every Time
         Planned Release: None

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Details:

When attempting to load a file with a size bigger
than 63 MB over TFTP grub shows this error message:

error: timeout reading `/boot/initrd'.

The problem lies in the blocknumber assigned to each
network packet. TFTP uses only 2 bytes for it, therefore
continuing after the overflow with blocknumber 0.
This overflow happens with a blocksize of 1024 after 63 MB.

(With current git of today f70d5c0701c6edf7f83c2e5ad01d29962b0aabd0)





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