The following is a small patch to the 2.5.47 kernel that adds an exported
function called valid_kernel_address() that allows kernel code to verify
a kernel-mapped address is valid.
valid_kernel_address just calls the static inline kernel_text_address()
function defined in arch/i386/kernel/traps.c
-rustyl
diff -urN linux-2.5.47/arch/i386/kernel/i386_ksyms.c linux-2.5.47-vka-patch/arch/i386/kernel/i386_ksyms.c
--- linux-2.5.47/arch/i386/kernel/i386_ksyms.c 2002-11-10 19:28:32.000000000 -0800
+++ linux-2.5.47-vka-patch/arch/i386/kernel/i386_ksyms.c 2002-11-13 11:46:49.000000000 -0800
@@ -59,6 +59,8 @@
extern unsigned long cpu_khz;
extern unsigned long get_cmos_time(void);
+extern int valid_kernel_address(unsigned long addr);
+
/* platform dependent support */
EXPORT_SYMBOL(boot_cpu_data);
#ifdef CONFIG_EISA
@@ -91,6 +93,7 @@
EXPORT_SYMBOL(get_cmos_time);
EXPORT_SYMBOL(cpu_khz);
EXPORT_SYMBOL(apm_info);
+EXPORT_SYMBOL(valid_kernel_address);
#ifdef CONFIG_DEBUG_IOVIRT
EXPORT_SYMBOL(__io_virt_debug);
diff -urN linux-2.5.47/arch/i386/kernel/traps.c linux-2.5.47-vka-patch/arch/i386/kernel/traps.c
--- linux-2.5.47/arch/i386/kernel/traps.c 2002-11-10 19:28:05.000000000 -0800
+++ linux-2.5.47-vka-patch/arch/i386/kernel/traps.c 2002-11-13 11:51:58.000000000 -0800
@@ -129,6 +129,11 @@
#endif
+int valid_kernel_address(unsigned long addr)
+{
+ return kernel_text_address(addr);
+}
+
void show_trace(unsigned long * stack)
{
int i;
-
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:30 EST