overcq <[email protected]> wrote: > Hello, > > I am trying to run a program I wrote that was ported from Linux. > It allows you to run in-program tasks as C functions. Each such task > is set up with its own allocated stack. > > However, in OpenBSD I cannot allocate the stack with mmap > with the PROT_NONE flag, and later in the SIGSEGV handler change > mprotect to PROT_READ | PROT_WRITE because mmap returns with error > errno == 22 (Invalid argument). > > Is there a workaround for this so that you don't have to allocate > the entire stack first? > > Below is a link to the code where mmap returns with an error: > https://github.com/overcq/oux/blob/master/module/base/flow-drv.cx#L188
At the moment we require stacks to be R|W sys/uvm/uvm_mmap.c line 260 There would need to be justification for why that program wants to do that, before changing this. The restriction for stacks is a bit like a safety belt.
