Re: kern/53232 (mprotect() modifications of stack pages)

To: kern-bug-people%netbsd.org@localhost,netbsd-bugs%netbsd.org@localhost,gnats-admin%netbsd.org@localhost,martin%NetBSD.org@localhost
Subject: Re: kern/53232 (mprotect() modifications of stack pages)
From: martin%NetBSD.org@localhost
Date: Sun, 29 Apr 2018 19:30:25 +0000 (UTC)

Synopsis: mprotect() modifications of stack pages

State-Changed-From-To: open->closed
State-Changed-By: martin%NetBSD.org@localhost
State-Changed-When: Sun, 29 Apr 2018 19:30:25 +0000
State-Changed-Why:
Not a bug, even documented in mprotect(2): you can not mprotect to
something less restrictive than the original mmap(2) with pax mprotect
enabled.
Workaround: mmap with PROT_READ|PROT_WRITE and mprotect() to 0, then
later it is possible to mprotect(PROT_READ|PROT_WRITE) again.

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