Messages in this thread | | | Date | Tue, 26 Jun 2018 11:21:10 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH v5 21/27] x86/ftrace: Adapt function tracing for PIE support |
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On Mon, 25 Jun 2018 15:39:09 -0700 Thomas Garnier <thgarnie@google.com> wrote:
> When using PIE with function tracing, the compiler generates a > call through the GOT (call *__fentry__@GOTPCREL). This instruction > takes 6-bytes instead of 5-bytes with a relative call. > > If PIE is enabled, replace the 6th byte of the GOT call by a 1-byte nop > so ftrace can handle the previous 5-bytes as before. > > Position Independent Executable (PIE) support will allow to extend the > KASLR randomization range 0xffffffff80000000. > > Signed-off-by: Thomas Garnier <thgarnie@google.com>
Thanks for doing it this way.
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-- Steve
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