Re: [PATCH] x86: Disable CET instrumentation in the kernel

[Nikolay Borisov]

On 28.01.21 г. 23:52 ч., Josh Poimboeuf wrote:
> 
> With retpolines disabled, some configurations of GCC will add Intel CET
> instrumentation to the kernel by default.  That breaks certain tracing
> scenarios by adding a superfluous ENDBR64 instruction before the fentry
> call, for functions which can be called indirectly.
> 
> CET instrumentation isn't currently necessary in the kernel, as CET is
> only supported in user space.  Disable it unconditionally.
> 
> Reported-by: Nikolay Borisov <nborisov@xxxxxxxx>
> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

Tested-by: Nikolay Borisov <nborisov@xxxxxxxx>
Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>