Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
*/
+#include <linux/elf.h>
#include <linux/ftrace.h>
#include <linux/memory.h>
#include <linux/extable.h>
/* Sort the kernel's built-in exception table */
void __init sort_main_extable(void)
{
- if (main_extable_sort_needed && __stop___ex_table > __start___ex_table) {
+ if (main_extable_sort_needed &&
+ &__stop___ex_table > &__start___ex_table) {
pr_notice("Sorting __ex_table...\n");
sort_extable(__start___ex_table, __stop___ex_table);
}
}
+/* Given an address, look for it in the kernel exception table */
+const
+struct exception_table_entry *search_kernel_exception_table(unsigned long addr)
+{
+ return search_extable(__start___ex_table,
+ __stop___ex_table - __start___ex_table, addr);
+}
+
/* Given an address, look for it in the exception tables. */
const struct exception_table_entry *search_exception_tables(unsigned long addr)
{
const struct exception_table_entry *e;
- e = search_extable(__start___ex_table,
- __stop___ex_table - __start___ex_table, addr);
+ e = search_kernel_exception_table(addr);
if (!e)
e = search_module_extables(addr);
+ if (!e)
+ e = search_bpf_extables(addr);
return e;
}
-int init_kernel_text(unsigned long addr)
-{
- if (addr >= (unsigned long)_sinittext &&
- addr < (unsigned long)_einittext)
- return 1;
- return 0;
-}
-
int notrace core_kernel_text(unsigned long addr)
{
- if (addr >= (unsigned long)_stext &&
- addr < (unsigned long)_etext)
+ if (is_kernel_text(addr))
return 1;
- if (system_state < SYSTEM_RUNNING &&
- init_kernel_text(addr))
- return 1;
- return 0;
-}
-
-/**
- * core_kernel_data - tell if addr points to kernel data
- * @addr: address to test
- *
- * Returns true if @addr passed in is from the core kernel data
- * section.
- *
- * Note: On some archs it may return true for core RODATA, and false
- * for others. But will always be true for core RW data.
- */
-int core_kernel_data(unsigned long addr)
-{
- if (addr >= (unsigned long)_sdata &&
- addr < (unsigned long)_edata)
+ if (system_state < SYSTEM_FREEING_INITMEM &&
+ is_kernel_inittext(addr))
return 1;
return 0;
}
* Since we are after the module-symbols check, there's
* no danger of address overlap:
*/
- if (init_kernel_text(addr))
+ if (is_kernel_inittext(addr))
return 1;
return 0;
}
* triggers a stack trace, or a WARN() that happens during
* coming back from idle, or cpu on or offlining.
*
- * is_module_text_address() as well as the kprobe slots
- * and is_bpf_text_address() require RCU to be watching.
+ * is_module_text_address() as well as the kprobe slots,
+ * is_bpf_text_address() and is_bpf_image_address require
+ * RCU to be watching.
*/
no_rcu = !rcu_is_watching();
/* Treat this like an NMI as it can happen anywhere */
if (no_rcu)
- rcu_nmi_enter();
+ ct_nmi_enter();
if (is_module_text_address(addr))
goto out;
ret = 0;
out:
if (no_rcu)
- rcu_nmi_exit();
+ ct_nmi_exit();
return ret;
}
/*
- * On some architectures (PPC64, IA64) function pointers
+ * On some architectures (PPC64, IA64, PARISC) function pointers
* are actually only tokens to some data that then holds the
* real function address. As a result, to find if a function
* pointer is part of the kernel text, we need to do some
* special dereferencing first.
*/
+#ifdef CONFIG_HAVE_FUNCTION_DESCRIPTORS
+void *dereference_function_descriptor(void *ptr)
+{
+ func_desc_t *desc = ptr;
+ void *p;
+
+ if (!get_kernel_nofault(p, (void *)&desc->addr))
+ ptr = p;
+ return ptr;
+}
+EXPORT_SYMBOL_GPL(dereference_function_descriptor);
+
+void *dereference_kernel_function_descriptor(void *ptr)
+{
+ if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
+ return ptr;
+
+ return dereference_function_descriptor(ptr);
+}
+#endif
+
int func_ptr_is_kernel_text(void *ptr)
{
unsigned long addr;