liminix

commit 57f6656d87e1c06a253a3d1149e9713acc207607
parent d0376d41016e0ddbd532b63f7fd3b2f4fcbcdf37
Author: Peter Collingbourne <peter@pcc.me.uk>
Date:   Sun,  3 May 2026 01:24:23 -0700

tufted: Roll over the tid on overflow

The specific rollover value is unspecified, but we assume that the other
side is U-Boot which rolls over to 0.
https://github.com/u-boot/u-boot/blob/bb0f3eebb3c196d9b6efbbd1e5aa9b16abbb9ad6/net/tftp.c#L275

This allows for very large images to be transferred, which is sometimes
necessary for running debugging or profiling tools designed for normal
Linux distributions such as perf.

Diffstat:
M
pkgs/tufted/tftp.lua
 | 
7
++++---

1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/pkgs/tufted/tftp.lua b/pkgs/tufted/tftp.lua
@@ -177,9 +177,10 @@ function tftp:handle_RRQ(socket, host, port, source, options)
         end
         log(("coroutine started on %s:%s/"):format(host, port))
         while not done do
-            if tid >= 2^16 then
-                socket:sendto(err("File too big."), host, port)
-                error("File too big.")
+            if tid == 2^16 then
+                -- Roll over the tid. The specific rollover value is unspecified, but we
+                -- assume that the other side is U-Boot which rolls over to 0.
+                tid = 0
             end
             local okay, continue, data = pcall(source, blksize)
             if not okay then