linux-kernel - [tip:x86/pti] kprobes/x86: Blacklist indirect thunk functions for kprobes

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Date:   Fri, 19 Jan 2018 07:47:47 -0800
From:   tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, peterz@...radead.org,
        linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        ananth@...ux.vnet.ibm.com, mhiramat@...nel.org, hpa@...or.com,
        mingo@...nel.org, gregkh@...ux-foundation.org,
        arjan@...ux.intel.com, dwmw@...zon.co.uk
Subject: [tip:x86/pti] kprobes/x86: Blacklist indirect thunk functions for
 kprobes

Commit-ID:  c1804a236894ecc942da7dc6c5abe209e56cba93
Gitweb:     https://git.kernel.org/tip/c1804a236894ecc942da7dc6c5abe209e56cba93
Author:     Masami Hiramatsu <mhiramat@...nel.org>
AuthorDate: Fri, 19 Jan 2018 01:14:51 +0900
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 19 Jan 2018 16:31:28 +0100

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

---
 arch/x86/lib/retpoline.S | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index d3415dc..dfb2ba9 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -25,7 +25,8 @@ ENDPROC(__x86_indirect_thunk_\reg)
  * than one per register with the correct names. So we do it
  * 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)
 
 GENERATE_THUNK(_ASM_AX)