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From: Ken Brown <kbrown AT cornell DOT edu>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Empty file without "x" permission is successfully executable on Cygwin
Date: Mon, 5 Aug 2019 20:01:26 +0000
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On 8/5/2019 2:18 PM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin wrote:
> Hi,
> 
> Please consider the following shell session:
> 
> $ cat dummy.c
> #include <stdio.h>
> 
> int main()
> {
>      return 0;
> }
> $ gcc -o dummy dummy.c
> $ mv dummy.exe dummy
> $ ./dummy
> $ echo $?
> 0
> $ chmod a-x dummy
> $ ./dummy
> -bash: ./dummy: Permission denied
> $ rm dummy
> $ touch dummy
> $ ./dummy
> $ echo $?
> 0
> 
> So Cygwin lets the shell to execute a zero-sized file regardless of the "x" perm
> (non-empty files are not executable if they do not have "x", as shown above).

I can't reproduce this on my system.  Can you show the permissions and ACL of dummy?

> There's more.  If I put some rubbish in a file, Cygwin still tries to execute it even if the "x" is not there:
> 
> $ rm dummy
> $ echo "1" > dummy
> $ ./dummy
> ./dummy: line 1: 1: command not found

Again I can't reproduce this.

Ken

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