Re: W^X mmap

To: current-users%netbsd.org@localhost
Subject: Re: W^X mmap
From: mlelstv%serpens.de@localhost (Michael van Elst)
Date: Sat, 10 Dec 2016 13:02:06 +0000 (UTC)

coypu%SDF.ORG@localhost writes:

>Why doesn't the following code get rejected by pax mprotect?

>	a = mmap(NULL, BUFSIZ, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON, -1, 2);


It gets 'rejected' by silently dropping the PROT_EXEC flag.

POSIX would require mmap to fail with errno = EACCES.
-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."

Follow-Ups:
- Re: W^X mmap
  - From: Pierre Pronchery

References:
- W^X mmap
  - From: coypu

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