linux-kernel - [PATCH v2 3/4] Ksplice: Export symbols needed for Ksplice

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Message-Id: <1235521315-3424-4-git-send-email-tabbott@mit.edu>
Date:	Tue, 24 Feb 2009 19:21:54 -0500
From:	Tim Abbott <tabbott@....EDU>
To:	linux-kernel@...r.kernel.org
Cc:	Tim Abbott <tabbott@....edu>, Anders Kaseorg <andersk@....edu>,
	Jeff Arnold <jbarnold@....edu>, Waseem Daher <wdaher@....edu>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Nikanth Karthikesan <knikanth@...e.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andi Kleen <andi@...stfloor.org>
Subject: [PATCH v2 3/4] Ksplice: Export symbols needed for Ksplice

Ksplice uses __module_address and __module_text_address to determine
which module contains various addresses.

Ksplice uses __kernel_text_address to limit its check for trampolines
(jump instructions inserted by Ksplice) to only text addresses.

Ksplice uses task_curr in order to confirm that no other tasks are
executing during Ksplice's kernel stack check.

Ksplice uses find_bug and search_exception_tables as part of its
conservative check that the user provided the correct source code for
the running kernel.

Signed-off-by: Tim Abbott <tabbott@....edu>
---
 kernel/extable.c |    3 +++
 kernel/module.c  |    2 ++
 kernel/sched.c   |    1 +
 lib/bug.c        |    1 +
 4 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/kernel/extable.c b/kernel/extable.c
index 384f0da..ce08fe8 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -40,6 +40,7 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
 		e = search_module_extables(addr);
 	return e;
 }
+EXPORT_SYMBOL_GPL(search_exception_tables);
 
 __notrace_funcgraph int core_kernel_text(unsigned long addr)
 {
@@ -60,6 +61,7 @@ __notrace_funcgraph int __kernel_text_address(unsigned long addr)
 		return 1;
 	return is_module_text_address(addr);
 }
+EXPORT_SYMBOL_GPL(__kernel_text_address);
 
 int kernel_text_address(unsigned long addr)
 {
@@ -83,3 +85,4 @@ int func_ptr_is_kernel_text(void *ptr)
 		return 1;
 	return is_module_text_address(addr);
 }
+EXPORT_SYMBOL_GPL(kernel_text_address);
diff --git a/kernel/module.c b/kernel/module.c
index 77fbf38..b3135db 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2760,6 +2760,7 @@ __notrace_funcgraph struct module *__module_address(unsigned long addr)
 			return mod;
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(__module_address);
 
 /*
  * is_module_text_address - is this address inside module code?
@@ -2798,6 +2799,7 @@ struct module *__module_text_address(unsigned long addr)
 	}
 	return mod;
 }
+EXPORT_SYMBOL_GPL(__module_text_address);
 
 /* Don't grab lock, we're oopsing. */
 void print_modules(void)
diff --git a/kernel/sched.c b/kernel/sched.c
index c1d0ed3..a35f940 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1801,6 +1801,7 @@ inline int task_curr(const struct task_struct *p)
 {
 	return cpu_curr(task_cpu(p)) == p;
 }
+EXPORT_SYMBOL_GPL(task_curr);
 
 static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
 {
diff --git a/lib/bug.c b/lib/bug.c
index 300e41a..c8491f9 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -124,6 +124,7 @@ const struct bug_entry *find_bug(unsigned long bugaddr)
 
 	return module_find_bug(bugaddr);
 }
+EXPORT_SYMBOL_GPL(find_bug);
 
 enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
 {
-- 
1.6.1.3

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