---

yaml --- r: 80433 b: refs/heads/master c: 0c42f39 h: refs/heads/master i: 80431: 49ffdf0 v: v3
git-mirror · Jan 30, 2008 · fc4ea58 · fc4ea58
1 parent 151e6da
commit fc4ea58
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Showing 4 changed files with 42 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b4416a1be86b0c7bdde4e6ba526715c1a055746f
+refs/heads/master: 0c42f392767d3592e1cf676857d398ef69be7c9c
diff --git a/trunk/arch/x86/Kconfig.debug b/trunk/arch/x86/Kconfig.debug
@@ -204,4 +204,9 @@ config DEBUG_BOOT_PARAMS
 	help
 	  This option will cause struct boot_params to be exported via debugfs.
 
+config CPA_DEBUG
+	bool "CPA self test code"
+	help
+	  Do change_page_attr self tests at boot.
+
 endmenu
diff --git a/trunk/arch/x86/mm/init_32.c b/trunk/arch/x86/mm/init_32.c
@@ -799,6 +799,20 @@ 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: Reverting %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;
@@ -815,6 +829,18 @@ 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
 

diff --git a/trunk/arch/x86/mm/init_64.c b/trunk/arch/x86/mm/init_64.c
@@ -606,6 +606,16 @@ 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