linux-kernel - [PATCH] kprobes: x86_64: blacklist non-attachable interrupt functions

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Message-ID: <20181206095648.GA8249@Dell>
Date:   Thu, 6 Dec 2018 10:56:48 +0100
From:   Andrea Righi <righi.andrea@...il.com>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Yonghong Song <yhs@...com>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kprobes: x86_64: blacklist non-attachable interrupt functions

These interrupt functions are already non-attachable by kprobes.
Blacklist them explicitly so that they can show up in
/sys/kernel/debug/kprobes/blacklist and tools like BCC can use this
additional information.

Signed-off-by: Andrea Righi <righi.andrea@...il.com>
---
 arch/x86/entry/entry_64.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index ce25d84023c0..1f0efdb7b629 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -566,6 +566,7 @@ ENTRY(interrupt_entry)
 
 	ret
 END(interrupt_entry)
+_ASM_NOKPROBE(interrupt_entry)
 
 
 /* Interrupt entry/exit. */
@@ -766,6 +767,7 @@ native_irq_return_ldt:
 	jmp	native_irq_return_iret
 #endif
 END(common_interrupt)
+_ASM_NOKPROBE(common_interrupt)
 
 /*
  * APIC interrupts.
@@ -780,6 +782,7 @@ ENTRY(\sym)
 	call	\do_sym	/* rdi points to pt_regs */
 	jmp	ret_from_intr
 END(\sym)
+_ASM_NOKPROBE(\sym)
 .endm
 
 /* Make sure APIC interrupt handlers end up in the irqentry section: */
@@ -960,6 +963,7 @@ ENTRY(\sym)
 
 	jmp	error_exit
 	.endif
+_ASM_NOKPROBE(\sym)
 END(\sym)
 .endm
 
-- 
2.17.1