Commit c1804a23 authored Jan 19, 2018 by Masami Hiramatsu Committed by Thomas Gleixner Jan 19, 2018

kprobes/x86: Blacklist indirect thunk functions for kprobes



Mark __x86_indirect_thunk_* functions as blacklist for kprobes
because those functions can be called from anywhere in the kernel
including blacklist functions of kprobes.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/151629209111.10241.5444852823378068683.stgit@devbox

parent 736e80a4

arch/x86/lib/retpoline.S

+2 −1

Original line number	Original line	Diff line number	Diff line
	@@ -25,7 +25,8 @@ ENDPROC(__x86_indirect_thunk_\reg)
	* than one per register with the correct names. So we do it		* than one per register with the correct names. So we do it
	* the simple and nasty way...		* the simple and nasty way...
	*/		*/
	#define EXPORT_THUNK(reg) EXPORT_SYMBOL(__x86_indirect_thunk_ ## reg)		#define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym)
			#define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg)
	#define GENERATE_THUNK(reg) THUNK reg ; EXPORT_THUNK(reg)		#define GENERATE_THUNK(reg) THUNK reg ; EXPORT_THUNK(reg)

	GENERATE_THUNK(_ASM_AX)		GENERATE_THUNK(_ASM_AX)

Admin message