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Date: | Sun, 17 Feb 2019 16:07:06 +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: | <20190217150706.GN4256@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> |
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--bX/mw5riLlTkt+Gv Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Feb 17 14:56, Ken Brown wrote: > On 2/17/2019 4:13 AM, Corinna Vinschen wrote: > > On Feb 17 10:08, Corinna Vinschen wrote: > >> On Feb 17 00:11, Ken Brown wrote: > >>> I'm getting a lot of errors like this when building emacs from its gi= t repo: > >>> > >> Weird. I built at least gawk and openssh with 3.0 already and I > >> didn't notice this problem. > >> > >>> A bisection points to the following as the first bad commit: > >>>[...] > >>> I'll try to do some debugging and/or provide further information > >>> tomorrow, but I thought I'd start with this preliminary report. > >> > >> That would be nice. It's not clear to me which permission is missing. > >> The first part of the patch has been reverted in 3.0.0, so > >> child_info_spawn::get_parent_handle opens the parent with > >> PROCESS_VM_READ again. The second patch has been reworked as well,m > >> the current perms are > >> > >> PROCESS_QUERY_LIMITED_INFORMATION | PROCESS_VM_READ | SYNCHRONIZE > >> > >> If I may place a bet, please try to replace > >> PROCESS_QUERY_LIMITED_INFORMATION with PROCESS_QUERY_INFORMATION >=20 > That didn't change anything. Just to make sure I understood correctly, h= ere's=20 > what I tried: >=20 > --- a/winsup/cygwin/sigproc.cc > +++ b/winsup/cygwin/sigproc.cc > @@ -814,7 +814,7 @@ child_info::child_info (unsigned in_cb, child_info_ty= pes 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) > { >=20 > > On second thought, an even better candidate may be PROCESS_VM_OPERATION. >=20 > That's even worse. With that change, simply invoking 'make' leads to > the same error. PROCESS_VM_OPERATION has to be specified additionally, not replacing PROCESS_QUERY_{LIMITED_}INFORMATION. Sorry if that wasn't clear. Another idea is to specify all process-specific permissions from https://docs.microsoft.com/en-us/windows/desktop/ProcThread/process-securit= y-and-access-rights and then eliminate backwards. Corinna --=20 Corinna Vinschen Cygwin Maintainer --bX/mw5riLlTkt+Gv Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEoVYPmneWZnwT6kwF9TYGna5ET6AFAlxpeJoACgkQ9TYGna5E T6C5jBAAnR3qhHA471m/61iclwl8NdbEB+hzwGvwRr91D+0GjGUvK2qPd1z3ADu+ CbTpJppw9aVXFtkd5FKbwbKEYtr2rjqEoFSIHbRFTZxbcvTlt5wFBMYZ1i2wS5TW 9XEJsuICyxgFFwSbsVur76lla80E3QpjVncwkn6eKM3nsoww3Vgakv778csDmkJU v78Ssw9lzyZ0mzgYFljzl2lLreITSMfLXzUMClBh4QO0THfVSo86sb+4PutpTgVL ejIaDUnksw/8bwBdtQFFq7iayLkiX/xyo/VWL4PN5ED4azq1T08XQtJRo2DEbRq+ 0ngAf4L1Vk/Ka61JQzfQfpSw1MDM2ms74sqT0aCvAsPG1FZXfRxmKyDrRN2xCMO3 2IwAldrwsvm9XFWmpvvV9Se8LutlWmP8WnchcRwFqsvs+umUzN0h4+g72KvSAC/S tOyydAqhzwA2iZQmoCYXmjkLOiIIH113r290ZXIV2YEmN9+aiF0BRQ5EeXxUP3aX MffJMoUu9lzBIEL7Qetmzb2OGukOxH+1y/YTEQTcioRlMRVsb+ksBBxMfPjI4RKY 6bnPLTS34yzorgesLouBCYmJRtW9cOd5M3ViXM5XM/qkFss0hY1Xzbei71WJfTv8 GZdlIQjOabVQ488qwvmKWcWKHRiG5YFo43fyxYkXJDe8fIbV4p0= =oM/v -----END PGP SIGNATURE----- --bX/mw5riLlTkt+Gv--
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