[PATCH CPA] [2/28] CPA: Do a simple self test at boot

[Andi Kleen]

When CONFIG_DEBUG_RODATA is enabled undo the ro mapping and redo it again.
This gives some simple testing for change_page_attr()

Optional patch, but I find it useful.

Signed-off-by: Andi Kleen <ak@xxxxxxx>

---
 arch/x86/Kconfig.debug |    5 +++++
 arch/x86/mm/init_32.c  |   22 ++++++++++++++++++++++
 arch/x86/mm/init_64.c  |   10 ++++++++++
 3 files changed, 37 insertions(+)

Index: linux/arch/x86/mm/init_64.c
===================================================================
--- linux.orig/arch/x86/mm/init_64.c
+++ linux/arch/x86/mm/init_64.c
@@ -596,6 +596,16 @@ void mark_rodata_ro(void)
 	 * of who is the culprit.
 	 */
 	global_flush_tlb();
+
+#ifdef CONFIG_CPA_DEBUG
+	printk("Testing CPA: undo %lx-%lx\n", start, end);
+	change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL);
+	global_flush_tlb();
+
+	printk("Testing CPA: again\n");
+	change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO);
+	global_flush_tlb();
+#endif
 }
 #endif
 
Index: linux/arch/x86/mm/init_32.c
===================================================================
--- linux.orig/arch/x86/mm/init_32.c
+++ linux/arch/x86/mm/init_32.c
@@ -792,6 +792,18 @@ void mark_rodata_ro(void)
 		change_page_attr(virt_to_page(start),
 		                 size >> PAGE_SHIFT, PAGE_KERNEL_RX);
 		printk("Write protecting the kernel text: %luk\n", size >> 10);
+
+#ifdef CONFIG_CPA_DEBUG
+		global_flush_tlb();
+
+		printk("Testing CPA: undo %lx-%lx\n", start, start+size);
+		change_page_attr(virt_to_page(start), size>>PAGE_SHIFT, PAGE_KERNEL_EXEC);
+		global_flush_tlb();
+
+		printk("Testing CPA: write protecting again\n");
+		change_page_attr(virt_to_page(start),size>>PAGE_SHIFT,PAGE_KERNEL_RX);
+		global_flush_tlb();
+#endif
 	}
 #endif
 	start += size;
@@ -808,6 +820,16 @@ void mark_rodata_ro(void)
 	 * of who is the culprit.
 	 */
 	global_flush_tlb();
+
+#ifdef CONFIG_CPA_DEBUG
+	printk("Testing CPA: undo %lx-%lx\n", start, start + size);
+	change_page_attr(virt_to_page(start), size >> PAGE_SHIFT, PAGE_KERNEL);
+	global_flush_tlb();
+
+	printk("Testing CPA: write protecting again\n");
+	change_page_attr(virt_to_page(start), size >> PAGE_SHIFT, PAGE_KERNEL_RO);
+	global_flush_tlb();
+#endif
 }
 #endif
 
Index: linux/arch/x86/Kconfig.debug
===================================================================
--- linux.orig/arch/x86/Kconfig.debug
+++ linux/arch/x86/Kconfig.debug
@@ -185,4 +185,9 @@ config DEFAULT_IO_DELAY_TYPE
 	default IO_DELAY_TYPE_NONE
 endif
 
+config CPA_DEBUG
+	bool "CPA self test code"
+	help
+	  Do change_page_attr self tests at boot.
+
 endmenu
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