Messages in this thread | | | From | David Howells <> | Subject | Re: [RFC][PATCH] Lock down ftrace | Date | Thu, 09 Nov 2017 21:54:19 +0000 |
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Steven Rostedt <rostedt@goodmis.org> 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
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