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Date:	Wed, 15 Feb 2023 15:31:38 +0000
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	Fw: Re: Fw: Re: Why do these mprotect always fail?
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From:	w6b7rk5yu4mt25v3 via Cygwin <cygwin AT cygwin DOT com>
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I asked the developer of the interpreter. He said it's OK to use the PAGE_S=
IZE value different than 4096. So I used this dirty hack:

#ifndef __CYGWIN__
#define PAGE_SIZE 4096
#endif

This means on Cygwin it will use the default PAGE_SIZE defined on limits.h =
(I'm taking advantage of the naming conflict here so I don't have to rename=
 PAGE_SIZE to JIT_PAGE_SIZE as suggested by the developer of the interprete=
r).

The result is it's no longer error with "Unable to mprotect" but will silen=
tly crashed without any error messages printed on the screen. So after all,=
 it's Cygwin's quirks here.

Sent with Proton Mail secure email.

------- Forwarded Message -------
From: Oskar Skog via Cygwin <cygwin AT cygwin DOT com>
Date: On Wednesday, February 15th, 2023 at 20:02
Subject: Re: Fw: Re: Why do these mprotect always fail?
To: cygwin AT cygwin DOT com <cygwin AT cygwin DOT com>


> On 2023-02-15 14:40, w6b7rk5yu4mt25v3 via Cygwin wrote:
>=20
> > You misunderstood what I said.
> >=20
> > It's really just a naming conflict and a coincident. On the context of =
the source code (it's an interpreter), PAGE_SIZE is indeed JIT_PAGE_SIZE (n=
ot the system page size, but the page size defined internally by the interp=
reter). On Linux, the name doesn't conflict. On Cygwin, I found on limits.h=
 and cygwin/limits.h already defined PAGE_SIZE so it caused a naming confli=
ct:
> >=20
> > #define __PAGESIZE 65536
> > #define PAGESIZE __PAGESIZE
> > #define PAGE_SIZE PAGESIZE
> >=20
> > But the problem not related to the naming conflict. If I renamed PAGE_S=
IZE to JIT_PAGE_SIZE, the problem is still there. The problem is Cygwin wil=
l not work with JIT_PAGE_SIZE =3D 4096. Please have a look at the code I po=
sted. It will always error with "Unable to mprotect".
>=20
>=20
> The Linux man page for mprotect says that the address MUST be aligned
> (with the systems PAGE_SIZE). Your call to posix_memalign is NOT
> aligning the allocation with the systems PAGE_SIZE (65536), but with
> your PAGE_SIZE (4096).
>=20
> You need to allocate memory that is aligned with the systems PAGE_SIZE.
>=20
> Eg.
> if(posix_memalign((void**)&buffer, (PAGE_SIZE>JIT_PAGE_SIZE) ? PAGE_SIZE
>=20
> : JIT_PAGE_SIZE, available)) { ... }
>=20
> --
> Problem reports: https://cygwin.com/problems.html
> FAQ: https://cygwin.com/faq/
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