Peter Zijlstra ee3e2469b3 x86/ftrace: Make it call depth tracking aware ... Since ftrace has trampolines, don't use thunks for the __fentry__ site but instead require that every function called from there includes accounting. This very much includes all the direct-call functions. Additionally, ftrace uses ROP tricks in two places: - return_to_handler(), and - ftrace_regs_caller() when pt_regs->orig_ax is set by a direct-call. return_to_handler() already uses a retpoline to replace an indirect-jump to defeat IBT, since this is a jump-type retpoline, make sure there is no accounting done and ALTERNATIVE the RET into a ret. ftrace_regs_caller() does much the same and gets the same treatment. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20220915111148.927545073@infradead.org		2022-10-17 16:41:19 +02:00
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ftrace-direct-modify.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
ftrace-direct-multi-modify.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
ftrace-direct-multi.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
ftrace-direct-too.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
ftrace-direct.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
Makefile	ftrace/samples: Add module to test multi direct modify interface	2021-12-09 13:02:44 -05:00
sample-trace-array.c	sample-trace-array: Remove trace_array 'sample-instance'	2020-06-16 21:21:02 -04:00
sample-trace-array.h	tracing: Sample module to demonstrate kernel access to Ftrace instances.	2019-11-22 19:41:08 -05:00