[Bug ld/24717] .note.gnu.property sections are not stored at an offset equal to their VMA in debuginfo files

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=24717

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |mark at klomp dot org

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
A main executable and a separate debug file have the exact same program
headers. This is to make matching them together easier. It also helps to have
to original program headers in the debug file for unstrip when the main
executable file has been prelinked, so you can still recombine them.

You cannot rely on the program headers in a .debug file since all allocated
sections (except for SHT_NOTES) have been replaced by NOBITS.

The reason this seems to work out for the .build_id NOTE is because it is
always put at the front of the file, so no other sections are removed before it
when put into a .debug file (and so the offset stays the same).

If you want this to work for any other allocated NOTEs then the linker would
have to sort them together at the front of the file (right after the .build-id
NOTE, the .build-id NOTE should always be first, so it gets dumped with the ELF
headers in a core file).

But in general I would say that programs that rely on the program headers in a
split .debug file are just broken.

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