Re: [RFC][PATCH] Lock down ftrace

[David Howells]

Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> Actually, I see it being enabled with DYNAMIC_FTRACE not set. Calling
> into sysctl and enabling ftrace_enable, will allow the
> ftrace_trace_function to be set to something other than ftrace_stub
> again, allowing for static function tracing to run too.

Hmmm...  Okay, I'm not sure what the sysctl achieves in non-dynamic mode.
Some of the functions used by ftrace_enable_sysctl() are stubbed out in that
case.  I was thinking that was stubbed out also, but apparently not.

Anyway, ftrace_enable_sysctl() is also prohibited in lockdown mode.

David