linux-kernel - [RFC] [patch 1/2] add non_init_kernel_text

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Message-Id: <200712171545.36306.srinivasa@in.ibm.com>
Date:	Mon, 17 Dec 2007 15:45:36 +0530
From:	Srinivasa Ds <srinivasa@...ibm.com>
To:	Johannes Weiner <hannes-kernel@...urebad.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, ananth@...ibm.com,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>, rusty@...tcorp.com.au
Subject: [RFC] [patch 1/2] add non_init_kernel_text_address

Changing regular_kernel_text_address() to persistent_kernel_text_address().

Since __init functions are discarded and its memory freed once
initialization completes, It would be better if we enable kprobes
to refuse probing __init functions. The attached patchset will do
that.

This patch creates persistent_kernel_text_address() to identify
"non_init" text area.


Signed-off-by: Srinivasa DS <srinivasa@...ibm.com>
Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>



---
 include/linux/kernel.h |    2 ++
 kernel/extable.c       |   16 +++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

Index: linux-2.6.24-rc5-mm1/include/linux/kernel.h
===================================================================
--- linux-2.6.24-rc5-mm1.orig/include/linux/kernel.h
+++ linux-2.6.24-rc5-mm1/include/linux/kernel.h
@@ -169,6 +169,8 @@ extern unsigned long long memparse(char 
 extern int core_kernel_text(unsigned long addr);
 extern int __kernel_text_address(unsigned long addr);
 extern int kernel_text_address(unsigned long addr);
+extern int persistent_kernel_text_address(unsigned long addr);
+extern int persistent_core_kernel_text(unsigned long addr);
 struct pid;
 extern struct pid *session_of_pgrp(struct pid *pgrp);
 
Index: linux-2.6.24-rc5-mm1/kernel/extable.c
===================================================================
--- linux-2.6.24-rc5-mm1.orig/kernel/extable.c
+++ linux-2.6.24-rc5-mm1/kernel/extable.c
@@ -40,11 +40,18 @@ const struct exception_table_entry *sear
 	return e;
 }
 
-int core_kernel_text(unsigned long addr)
+int persistent_core_kernel_text(unsigned long addr)
 {
 	if (addr >= (unsigned long)_stext &&
 	    addr <= (unsigned long)_etext)
 		return 1;
+	return 0;
+}
+
+int core_kernel_text(unsigned long addr)
+{
+	if (persistent_core_kernel_text(addr))
+		return 1;
 
 	if (addr >= (unsigned long)_sinittext &&
 	    addr <= (unsigned long)_einittext)
@@ -65,3 +72,10 @@ int kernel_text_address(unsigned long ad
 		return 1;
 	return module_text_address(addr) != NULL;
 }
+
+int persistent_kernel_text_address(unsigned long addr)
+{
+	if (persistent_core_kernel_text(addr))
+		return 1;
+	return module_text_address(addr) != NULL;
+}



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