Re: [PATCH v26 6/9] x86/vdso: Insert endbr32/endbr64 to vDSO

Kees Cook
2021-04-28T20:39:47Z

On Tue, Apr 27, 2021 at 01:47:17PM -0700, Yu-cheng Yu wrote:
> From: "H.J. Lu" <hjl.tools@gmail.com>
>
> 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@gmail.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

--
Kees Cook