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devel / comp.lang.ada / Warning: requires executable stack...

SubjectAuthor
* Warning: requires executable stack...reinert
`* Re: Warning: requires executable stack...Simon Wright
 `- Re: Warning: requires executable stack...reinert

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Warning: requires executable stack...

<47c0e248-bc1e-4784-8eed-8a8a64758be7n@googlegroups.com>

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Subject: Warning: requires executable stack...
From: reinkor@gmail.com (reinert)
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 by: reinert - Fri, 28 Apr 2023 05:38 UTC

Hello,

I use alire and I just updated via these commands:

alr index --update-all
alr toolchain --select

(selected
gnat_native=12.2.1
and
gprbuild=22.0.1
)

All seem OK, but when I use "alr build" I finally get this warning:

....../.config/alire/cache/dependencies/gnat_native_12.2.1_11f3b811/bin/../lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: warning: kobio0.o: requires executable stack (because the .note.GNU-stack section is executable)
Build finished successfully in 19.48 seconds.

When trying a simple "hello_world" programme, I do not get this annoying warning.

Any hint?
I do not like warnings which I do not understand anything from :-)

reinert

Re: Warning: requires executable stack...

<lyr0s4a2na.fsf@pushface.org>

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From: simon@pushface.org (Simon Wright)
Newsgroups: comp.lang.ada
Subject: Re: Warning: requires executable stack...
Date: Fri, 28 Apr 2023 08:26:17 +0100
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 by: Simon Wright - Fri, 28 Apr 2023 07:26 UTC

reinert <reinkor@gmail.com> writes:

> ...../.config/alire/cache/dependencies/gnat_native_12.2.1_11f3b811/bin/../lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../x86_64-pc-linux-gnu/bin/ld:
> warning: kobio0.o: requires executable stack (because the
> .note.GNU-stack section is executable)

Creating executable code on the stack is one way of getting malicious
code past virus checkers. Modern OSs will prevent this approach.

So far as I know, GNAT will only do this to implement "trampolines", but see
here:
https://docs.adacore.com/live/wave/gnat_rm/html/gnat_rm/gnat_rm/standard_and_implementation_defined_restrictions.html#no-implicit-dynamic-code

Re: Warning: requires executable stack...

<1afb8ecb-1358-4032-a8ed-aea0ad9c15a5n@googlegroups.com>

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Subject: Re: Warning: requires executable stack...
From: reinkor@gmail.com (reinert)
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 by: reinert - Fri, 28 Apr 2023 10:04 UTC

Thanks for swift answer. Seems like I have to live with the warning.

I learned about pragma restrictions(...); :-)

reinert

fredag 28. april 2023 kl. 09:26:20 UTC+2 skrev Simon Wright:
> reinert <rei...@gmail.com> writes:
>
> > ...../.config/alire/cache/dependencies/gnat_native_12.2.1_11f3b811/bin/../lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../x86_64-pc-linux-gnu/bin/ld:
> > warning: kobio0.o: requires executable stack (because the
> > .note.GNU-stack section is executable)
> Creating executable code on the stack is one way of getting malicious
> code past virus checkers. Modern OSs will prevent this approach.
>
> So far as I know, GNAT will only do this to implement "trampolines", but see
> here:
> https://docs.adacore.com/live/wave/gnat_rm/html/gnat_rm/gnat_rm/standard_and_implementation_defined_restrictions.html#no-implicit-dynamic-code

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