kernel hangs after running program that uses a custom SIGSEGV handler

Bruno Haible bruno at
Thu Apr 12 00:45:52 PDT 2018

Stef O'Rear wrote:
> The bug is caused by mishandling of PROT_NONE (failing to distinguish
> between PROT_NONE and non-present pages)

Indeed, this sounds like a possible bug cause: clisp is one of the few
programs that uses mprotect not only with PROT_READ and PROT_READ_WRITE
but also occasionally with PROT_NONE.


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