[PATCH] kselftest/arm64: bti: force static linking

[Catalin Marinas]

On Wed, May 11, 2022 at 06:21:29PM +0100, Andre Przywara wrote:
> The "bti" selftests are built with -nostdlib, which apparently
> automatically creates a statically linked binary, which is what we want
> and need for BTI (to avoid interactions with the dynamic linker).
> 
> However this is not true when building a PIE binary, which some
> toolchains (Ubuntu) configure as the default.
> When compiling btitest with such a toolchain, it will create a
> dynamically linked binary, which will probably fail some tests, as the
> dynamic linker might not support BTI:
> ===================
> TAP version 13
> 1..18
> not ok 1 nohint_func/call_using_br_x0
> not ok 2 nohint_func/call_using_br_x16
> not ok 3 nohint_func/call_using_blr
> ....
> ===================
> 
> To make sure we create static binaries, add an explicit -static on the
> linker command line. This forces static linking even if the toolchain
> defaults to PIE builds, and fixes btitest runs on BTI enabled machines.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>

Does this need to go in as a fix (cc stable, fixes tag)?

-- 
Catalin