On 9/25/2020 9:18 AM, Andy Lutomirski wrote:

On Fri, Sep 25, 2020 at 7:58 AM Yu-cheng Yu [off-list ref] wrote:

quoted

From: "H.J. Lu" <redacted>

When Indirect Branch Tracking (IBT) is enabled, vDSO functions may be
called indirectly, and must have ENDBR32 or ENDBR64 as the first
instruction.  The compiler must support -fcf-protection=branch so that it
can be used to compile vDSO.

Acked-by: Andy Lutomirski <luto@kernel.org>

Thanks!

Yu-cheng