Public bug reported:
In GCC 15 all arm64 binaries that have standard branch protection
(present in our default flags) started using GCS. However, the linker
will issue warnings if mixing libraries that expose GCS compatibility
with non-GCS ones.
This is the case for lib25519, as it contains asm files that needs to be
manually annotated to export the proper section.
It's a fairly annoying issue, since glibc *does* expose GCS info since
2.42-0ubuntu1, thus triggering the warning:
❯ readelf -n libc.so.6
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: BTI, PAC, GCS
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
** Affects: lib25519 (Ubuntu)
Importance: High
Status: Triaged
** Tags: update-excuse
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https://bugs.launchpad.net/bugs/2121033
Title:
lib25519 doesn't expose GCS attribute on arm64
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