Re: [PATCH v2 12/39] x86/ibt,ftrace: Search for __fentry__ location

[Kees Cook]

On Thu, Feb 24, 2022 at 03:51:50PM +0100, Peter Zijlstra wrote:
> Have ftrace_location() search the symbol for the __fentry__ location
> when it isn't at func+0 and use this for {,un}register_ftrace_direct().
> 
> This avoids a whole bunch of assumptions about __fentry__ being at
> func+0.
> 
> Suggested-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>

Cool. This should help with anything using __fentry__ tricks (i.e.
future CFI...), yes?

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook