[2.5.47]Add exported valid_kernel_address()

PATCH In review Rusty Lynch 2 participants 2 messages Nov 13, 2002

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Rusty Lynch

author

2002-11-13 20:06 UTC #0 lore raw

PATCH 1/1 [2.5.47]Add exported valid_kernel_address()

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

arch/i386/kernel/i386_ksyms.c +3 -0

diff -urN linux-2.5.47/arch/i386/kernel/i386_ksyms.c linux-2.5.47-vka-patch/arch/i386/kernel/i386_ksyms.c
@@ -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);

arch/i386/kernel/traps.c +5 -0

diff -urN linux-2.5.47/arch/i386/kernel/traps.c linux-2.5.47-vka-patch/arch/i386/kernel/traps.c
@@ -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;

Arjan van de Ven

2002-11-13 20:56 UTC #1 lore raw

Quoted 7 lines · Rusty Lynch

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

it is customary that people who ask for an export explain why they need it.... would you mind explaining that ?