Hi, This could have been caused by our switch from the BFD linker to gold. > Could you try linking a hello world program using gold linker and > running it in WSL? >
I tried to build Swift by not using -fuse-gold option and the result was same. Are you sure that PROT_GROWSDOWN is the flag that enables executable > stack? I thought that's what PROT_EXEC is for. I'm not sure what > PROT_GROWSDOWN actually changes, if I were to speculate, I'd say it > could be a marker that means "this is a stack" or maybe even be just a > performance hint. > You are right. The executable stack is enabled by PROT_EXEC. But Swift shared library's executable stack seems to set PROT_EXEC AND PROT_GROWSDOWN according to strace. I don't know what causes Swift shared library to have executable stack since Febrary 25 snapshot. Febrary 8 snapshot and Swift 2.X branches have no such executable stack shared library. Thanks, -Kim, Jongsu
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