On Tue, Dec 06, 2022 at 01:43:08PM -0700, Tom Saeger wrote:
> Backport of: 0d362be5b142 ("Makefile: link with -z noexecstack --no-warn-rwx-segments")
> breaks arm64 Build ID when CONFIG_MODVERSIONS=y.
>
> CONFIG_MODVERSIONS adds extra tooling to calculate symbol versions.
> This kernel's KBUILD tooling uses both
> relocatable (-r) and (-z noexecstack) to link head.o
> which results in ld adding a .note.GNU-stack section.
> Final linking of vmlinux should add a .NOTES segment containing the
> Build ID, but does NOT if head.o has a .note.GNU-stack section.
>
> Selectively remove -z noexecstack from head.o's KBUILD_LDFLAGS to
> prevent .note.GNU-stack from being added to head.o. Final link of
> vmlinux then properly adds .NOTES segment containing Build ID that can
> be read using tools like 'readelf -n'.
>
> Cc: <stable@xxxxxxxxxxxxxxx> # 5.15, 5.10, 5.4
> Signed-off-by: Tom Saeger <tom.saeger@xxxxxxxxxx>
> ---
> arch/arm64/kernel/Makefile | 5 +++++
> 1 file changed, 5 insertions(+)
Why isn't this needed in Linus's tree?
And why not cc: everyone involved in this, I would need acks from
maintainers to be able to accept this...
thanks,
greg k-h
