DOS ain't dead

UPX and Freepascal 3.x binaries (Announce)

posted by marcov, 24.07.2026, 22:16

> Hm, UPX team will not adjust the code to support the FPC 3.x binaries
> because it is just a bug of FPC.
> However, I think, if is it only some minor problem in the COFF header it
> should be able to relatively easy to modify such incorrect DOS/COFF header.

IMHO it should be a wakeup call for UPX wrt input validation and errorhandling.

Sigsegv is simply not the friendliest way of informing the user that there is a problem

Complete thread:

• UPX and Freepascal 3.x binaries - Laaca, 15.07.2026, 08:07 (Announce)
  • UPX and Freepascal 3.x binaries - Laaca, 23.07.2026, 20:56
    • UPX and Freepascal 3.x binaries - marcov, 24.07.2026, 22:16
    • UPX and Freepascal 3.x binaries - Laaca, 25.07.2026, 16:53