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Date: Sun, 17 Feb 2019 17:39:55 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: fixup_mmaps_after_fork failure with cygwin-3.0.0
Message-ID: <20190217163955.GO4256@calimero.vinschen.de>
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References: <1d506605-a0af-12c2-6faf-ac74ab842182 AT cornell DOT edu> <20190217090820 DOT GI4256 AT calimero DOT vinschen DOT de> <20190217091308 DOT GK4256 AT calimero DOT vinschen DOT de> <0587a444-6849-b35f-60b1-700282408f07 AT cornell DOT edu> <20190217150706 DOT GN4256 AT calimero DOT vinschen DOT de> <d2910b3c-d50e-c00e-90e0-0c54be6702fe AT cornell DOT edu>
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On Feb 17 16:34, Ken Brown wrote:
> On 2/17/2019 10:07 AM, Corinna Vinschen wrote:
> > On Feb 17 14:56, Ken Brown wrote:
> >> On 2/17/2019 4:13 AM, Corinna Vinschen wrote:
> >>>> If I may place a bet, please try to replace
> >>>> PROCESS_QUERY_LIMITED_INFORMATION with PROCESS_QUERY_INFORMATION
> >>
> >> That didn't change anything.  Just to make sure I understood correctly=
, here's
> >> what I tried:
> >>
> >> --- a/winsup/cygwin/sigproc.cc
> >> +++ b/winsup/cygwin/sigproc.cc
> >> @@ -814,7 +814,7 @@ child_info::child_info (unsigned in_cb, child_info=
_types chtype,
> >>         allow the child to copy cygheap etc. from the parent to itself=
.  If
> >>         we're forking, we also need handle duplicate access. */
> >>      parent =3D NULL;
> >> -  DWORD perms =3D PROCESS_QUERY_LIMITED_INFORMATION | PROCESS_VM_READ
> >> +  DWORD perms =3D PROCESS_QUERY_INFORMATION | PROCESS_VM_READ
> >>                   | SYNCHRONIZE;
> >>      if (type =3D=3D _CH_FORK)
> >>        {
> >>
> >>> On second thought, an even better candidate may be PROCESS_VM_OPERATI=
ON.
> >>
> >> That's even worse.  With that change, simply invoking 'make' leads to
> >> the same error.
> >=20
> > PROCESS_VM_OPERATION has to be specified additionally, not replacing
> > PROCESS_QUERY_{LIMITED_}INFORMATION.  Sorry if that wasn't clear.
>=20
> Success: Simply adding PROCESS_VM_OPERATION to the existing permissions f=
ixes=20
> the problem.

Thanks for tracking this down, I upload a fixed 3.0.1 pretty soon.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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