linux-kernel - [PATCH 1/2] kprobe: fix: Add _ASM_NOKPROBE to x86 apic interrupt macro

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Date:   Fri, 14 Jul 2017 10:58:34 -0400
From:   Francis Deslauriers <francis.deslauriers@...icios.com>
To:     rostedt@...dmis.org, mhiramat@...nel.org, peterz@...radead.org
Cc:     mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org,
        Francis Deslauriers <francis.deslauriers@...icios.com>
Subject: [PATCH 1/2] kprobe: fix: Add _ASM_NOKPROBE to x86 apic interrupt macro

Adding a Kprobe on the apic_timer_interrupt symbol can lead to a kernel
crash.
This symbol is defined by the apicinterrupt3 macro and adding the symbol
to the kprobe blacklist in this macro prevents this issue.

Signed-off-by: Francis Deslauriers <francis.deslauriers@...icios.com>
---
 arch/x86/entry/entry_64.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 4a4c083..67cf702 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -659,6 +659,7 @@ ENTRY(\sym)
 	interrupt \do_sym
 	jmp	ret_from_intr
 END(\sym)
+_ASM_NOKPROBE(\sym)
 .endm
 
 #ifdef CONFIG_TRACING
-- 
2.7.4