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Subject:	Re: Cygwin terminal fails to start after win update
To:	m DOT moats AT 3arts DOT us, cygwin AT cygwin DOT com
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From:	Ken Brown via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Ken Brown <kbrown AT cornell DOT edu>
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On 9/2/2020 3:32 PM, Michael Moats wrote:
> Hello. Loaded cygwin a few weeks ago, but after windows 10 update, mintty term 
> fails to start.
> 
> Versions:
> cygwin 3.1.6-1
> 
> OS Name    Microsoft Windows 10 Home
> Version    10.0.19041 Build 19041
> 
> When problem first noticed:
> Error: Could not fork child process: Resource temporarily unavailable (-1).
> DLL rebasing may be required; see 'rebaseall / rebase --help'.
> (and terminal allows no typing)
> 
> When attempt is made to add dll, bash and some other individual exceptions to 
> firewall ASLR settings, Mintty starts & shell commands such as echo and pwd will 
> work, but commands from /bin (i.e. ls, ln, grep, vi, cat, which) return nothing. 
> Maybe more exceptions needed, but which ones?
> 
> To get cygwin working a usual, these gross windows defender firewall changes 
> were made:
> 
> Windows Security
>      App & browser control
>          Exploit protection
> 
> Force randomization for images (Mandatory ASLR)
>      Force relocation of images not compiled with /DYNAMICBASE
> -> Off by default     [Mintty working]
> -> On by default    [Mintyy not working]
> 
> Randomize memory allocations (Bottom-up ASLR)
>      Randomize locations for virtual memory allocations.
> -> Off by default     [Mintyy working]
> -> On by default    [Mintyy not working]
> 
> High-entropy ASLR
>      Increase variability when using Randomize memory allocations (Bottom-up ASLR)
> -> Off by default     [Mintty working]
> -> On by default    [Mintty not working]
> 
> When Cyg/Mintty is working with above gross changes:
>      $ cd /usr
> 
>      $ ln -s /bin /usr/bin
> 
>      $ ls -i | grep bin
>      1125899907459844 bin/
>      562949954038681 sbin/
> 
>      $ cd ..
> 
>      $ ls -i | grep bin
>      1125899907459844 bin/
>      562949954038681 sbin/
> 
>      $ ps -ef | grep -i min
>         XXXXX     649       1 ?        13:18:14 /usr/bin/mintty
> 
> Thanks in advance!!

There was a recent discussion about this issue here:

   https://sourceware.org/pipermail/cygwin/2020-August/245973.html
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