64-bit qmail was remotely exploitable. The author believes a small address space (below 4 GB) was an adequate mitigation, but the code was confused and trying t

64-bit qmail was remotely exploitable. The author believes a small address space (below 4 GB) was an adequate mitigation, but the code was confused and trying to do something unsafe. https://lwn.net/Articles/820969/ https://lwn.net/Articles/820969/