linux-kernel - [tip:perf/probes] kprobes/x86-64: Fix to move common

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Date:	Sat, 17 Oct 2009 09:57:44 GMT
From:	tip-bot for Masami Hiramatsu <mhiramat@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ananth@...ibm.com, hpa@...or.com,
	mingo@...hat.com, fweisbec@...il.com, tglx@...utronix.de,
	mhiramat@...hat.com, mingo@...e.hu
Subject: [tip:perf/probes] kprobes/x86-64: Fix to move common_interrupt to .kprobes.text

Commit-ID:  8222d718b3ad3ae49c48f69ae4b6a1128c9a92cf
Gitweb:     http://git.kernel.org/tip/8222d718b3ad3ae49c48f69ae4b6a1128c9a92cf
Author:     Masami Hiramatsu <mhiramat@...hat.com>
AuthorDate: Thu, 27 Aug 2009 13:23:25 -0400
Committer:  Frederic Weisbecker <fweisbec@...il.com>
CommitDate: Sun, 30 Aug 2009 03:08:27 +0200

kprobes/x86-64: Fix to move common_interrupt to .kprobes.text

Since nmi, debug and int3 returns to irq_return inside common_interrupt,
probing this function will cause int3-loop, so it should be marked
as __kprobes.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Ingo Molnar <mingo@...e.hu>
LKML-Reference: <20090827172325.8246.40000.stgit@...alhost.localdomain>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/x86/kernel/entry_64.S |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index c251be7..36e2ef5 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -809,6 +809,10 @@ END(interrupt)
 	call \func
 	.endm
 
+/*
+ * Interrupt entry/exit should be protected against kprobes
+ */
+	.pushsection .kprobes.text, "ax"
 	/*
 	 * The interrupt stubs push (~vector+0x80) onto the stack and
 	 * then jump to common_interrupt.
@@ -947,6 +951,10 @@ ENTRY(retint_kernel)
 
 	CFI_ENDPROC
 END(common_interrupt)
+/*
+ * End of kprobes section
+ */
+       .popsection
 
 /*
  * APIC interrupts.
--
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