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Subject[PATCH v2 3/4] Ksplice: Export symbols needed for Ksplice
Date
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@mit.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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