binutils as policy checker (was: RFC: Add a linker warning when creating segments with RWX permissions)

[Matthias Klose]

On 28.04.22 11:46, Nick Clifton via Binutils wrote:
> Hi Guys,
> 
>    OK, attached is v2 of my proposed patch.  The main features of this
>    new version are:
> 
>      * There are now configure options which can turn off the generation
>        of linker warnings about the creation of executable segments and
>        the creation of executable stacks.  By default however not using
>        these configure options will result in the creation of a linker
>        with all of the warnings enabled.
> 
>      * There is new linker command line option: --no-warn-rwx-segments
>        which disables the warnings about executable segments.
> 
>      * There are tests for the new features, plus extra regexps in the
>        testsuite's pruning proc to remove the warnings from the linker's
>        output for normal tests.
> 
>      * The creation of a TLS segment with eXecute permission will trigger
>        a warning, regardless of whether it has the read and/or write
>        permissions set.
> 
>      * There is a new configure time option which will disable the
>        creation of an executable stack simply because an input file is
>        missing a .note-GNU-stack section (for those architectures where
>        such a creation is the normal behaviour).  This option is not
>        enabled by default however.  At least not yet.
> 
>    I think that this represents the best compromise between helping to
>    promote secure builds whilst also allowing toolchain creators and
>    program builders the option to disable the features if they wish.
> 
>    Any comments ?

this commit contains a ld/aclocal.m4 generated with automake 1.16.  Please 
re-create that file with automake 1.15.1. And maybe re-create the Makefile.in 
also with the correct automake version.

Thanks, Matthias