Re: [PATCH v19 7/7] x86/vdso: Insert endbr32/endbr64 to vDSO

[Kees Cook]

On Wed, Feb 03, 2021 at 02:59:02PM -0800, Yu-cheng Yu wrote:
> From: "H.J. Lu" <hjl.tools@xxxxxxxxx>
> 
> 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.
> 
> Signed-off-by: H.J. Lu <hjl.tools@xxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook