[PATCH v3 2/8] elf: Add a tunable to control use of tagged memory

[H.J. Lu]

On Thu, Nov 26, 2020 at 8:04 AM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
> On 11/26/20 9:20 PM, H.J. Lu wrote:
>  > I think we need to address binary marking first before adding MTE to
>  > glibc.
>
> Could you elaborate on why binary marking should block glibc support in
> MTE?  Do you see it changing the design considerably?  Other than the
> tunables (that are not guaranteed to be stable across releases) and
> configure flags, I could not spot any irreversible ABI/API impact that
> would cause issues later.
>

The ultimate goal is to have a single glibc binary which runs everywhere.
Glibc needs to handle static executables, dynamic executables as well as
dlopened shared objects.  Initially, no binaries are marked and memory
tag should be disabled by default.  Tunable can be used to enable memory
tag manually at run-time.  We don't know if there are any issues in the current
patches without considering the memory tag marker support.

-- 
H.J.