[Fault-injection-developer] [PATCH 2/4] basic FITH patch against 2.5.47 + kprobes

[Zhuang, L. <lou...@in...>]

Here are basic FITH patch to places several hooks in kernel.

diff -Nur -X dontdiff linux-2.5-kp/linux-2.5.47/Makefile
linux-2.5-kp-fi/linux-2.5.47/Makefile
--- linux-2.5-kp/linux-2.5.47/Makefile	Mon Nov 25 15:12:15 2002
+++ linux-2.5-kp-fi/linux-2.5.47/Makefile	Mon Nov 25 15:15:38 2002
@@ -1,7 +1,7 @@
 VERSION = 2
 PATCHLEVEL = 5
 SUBLEVEL = 47
-EXTRAVERSION =
+EXTRAVERSION =kp-fi
 
 # *DOCUMENTATION*
 # To see a list of typical targets execute "make help"
diff -Nur -X dontdiff linux-2.5-kp/linux-2.5.47/arch/i386/Kconfig
linux-2.5-kp-fi/linux-2.5.47/arch/i386/Kconfig
--- linux-2.5-kp/linux-2.5.47/arch/i386/Kconfig	Mon Nov 25 15:12:19 2002
+++ linux-2.5-kp-fi/linux-2.5.47/arch/i386/Kconfig	Mon Nov 25 15:15:40
2002
@@ -1562,11 +1562,20 @@
 
 config DEBUGREG
 	bool "Global Debug Registers"
-	depend on DEBUG_KERNEL
+	depends on DEBUG_KERNEL
+	help
 
 config KWATCH
 	bool "Kwatch points"
-	depend on DEBUGREG
+	depends on DEBUGREG
+	help
+
+config FI
+	bool "Fault Injection"
+	depends on KPROBES
+	help
+	  Say Y here if you want to enable Fault Injection (FI) mechanism. 
+	  The FI can monitor MMIO/IO access in kernel.
 
 config DEBUG_STACKOVERFLOW
 	bool "Check for stack overflows"
diff -Nur -X dontdiff linux-2.5-kp/linux-2.5.47/arch/i386/kernel/i386_ksyms.
c linux-2.5-kp-fi/linux-2.5.47/arch/i386/kernel/i386_ksyms.c
--- linux-2.5-kp/linux-2.5.47/arch/i386/kernel/i386_ksyms.c	Mon Nov 25
15:12:19 2002
+++ linux-2.5-kp-fi/linux-2.5.47/arch/i386/kernel/i386_ksyms.c	Mon Nov 25
15:15:40 2002
@@ -32,6 +32,7 @@
 #include <asm/tlbflush.h>
 #include <asm/nmi.h>
 #include <asm/edd.h>
+#include <asm/fi.h>
 
 extern void dump_thread(struct pt_regs *, struct user *);
 extern spinlock_t rtc_lock;
@@ -216,3 +217,9 @@
 EXPORT_SYMBOL(edd);
 EXPORT_SYMBOL(eddnr);
 #endif
+
+#ifdef CONFIG_FI
+EXPORT_SYMBOL(irq_desc);
+EXPORT_SYMBOL(fi_page_fault);
+EXPORT_SYMBOL(fi_post_page_fault);
+#endif
diff -Nur -X dontdiff linux-2.5-kp/linux-2.5.47/arch/i386/kernel/traps.c
linux-2.5-kp-fi/linux-2.5.47/arch/i386/kernel/traps.c
--- linux-2.5-kp/linux-2.5.47/arch/i386/kernel/traps.c	Mon Nov 25 15:12:19
2002
+++ linux-2.5-kp-fi/linux-2.5.47/arch/i386/kernel/traps.c	Mon Nov 25
15:15:41 2002
@@ -47,6 +47,7 @@
 #include <asm/smp.h>
 #include <asm/pgalloc.h>
 #include <asm/arch_hooks.h>
+#include <asm/fi.h>
 
 #include <linux/irq.h>
 #include <linux/module.h>
@@ -564,6 +565,9 @@
 	return 0;
 }
 
+int (*fi_post_page_fault) (unsigned long condition,
+		struct pt_regs *reg);
+
 /*
  * Our handling of the processor debug registers is non-trivial.
  * We do not clear them on entry and exit from the kernel. Therefore
@@ -599,7 +603,10 @@
 
 	if (kwatch_handler(condition, regs))
 		return 1;
-
+#ifdef CONFIG_FI
+	if (fi_post_page_fault && fi_post_page_fault(condition, regs))
+		return 1;
+#endif
 	/* Interrupts not disabled for normal trap handling. */
 	restore_interrupts(regs);
 
diff -Nur -X dontdiff linux-2.5-kp/linux-2.5.47/arch/i386/mm/fault.c
linux-2.5-kp-fi/linux-2.5.47/arch/i386/mm/fault.c
--- linux-2.5-kp/linux-2.5.47/arch/i386/mm/fault.c	Mon Nov 25 15:12:20
2002
+++ linux-2.5-kp-fi/linux-2.5.47/arch/i386/mm/fault.c	Mon Nov 25 15:15:41
2002
@@ -26,6 +26,7 @@
 #include <asm/pgalloc.h>
 #include <asm/hardirq.h>
 #include <asm/desc.h>
+#include <asm/fi.h>
 
 extern void die(const char *,struct pt_regs *,long);
 
@@ -139,6 +140,7 @@
 }
 
 asmlinkage void do_invalid_op(struct pt_regs *, unsigned long);
+int (*fi_page_fault) ( struct pt_regs *regs, unsigned long address);
 
 /*
  * This routine handles page faults.  It determines the address,
@@ -166,7 +168,10 @@
 
 	if (kprobe_running() && kprobe_fault_handler(regs, 14))
 		return;
-
+#ifdef CONFIG_FI
+	if (fi_page_fault && fi_page_fault(regs, address))
+		return;
+#endif
 	/* It's safe to allow irq's after cr2 has been saved */
 	if (regs->eflags & X86_EFLAGS_IF)
 		local_irq_enable();
diff -Nur -X dontdiff linux-2.5-kp/linux-2.5.47/include/asm-i386/fi.h
linux-2.5-kp-fi/linux-2.5.47/include/asm-i386/fi.h
--- linux-2.5-kp/linux-2.5.47/include/asm-i386/fi.h	Thu Jan  1 08:00:00
1970
+++ linux-2.5-kp-fi/linux-2.5.47/include/asm-i386/fi.h	Mon Nov 25 15:16:18
2002
@@ -0,0 +1,8 @@
+#ifndef _ASM_FI_H
+#define _ASM_FI_H
+#ifdef CONFIG_FI
+extern int (*fi_page_fault) ( struct pt_regs *regs, unsigned long address);
+extern int (*fi_post_page_fault) (unsigned long condition, 
+		struct pt_regs *reg);
+#endif
+#endif /* _ASM_FI_H */
diff -Nur -X dontdiff linux-2.5-kp/linux-2.5.47/kernel/ksyms.c
linux-2.5-kp-fi/linux-2.5.47/kernel/ksyms.c
--- linux-2.5-kp/linux-2.5.47/kernel/ksyms.c	Mon Nov 25 15:13:04 2002
+++ linux-2.5-kp-fi/linux-2.5.47/kernel/ksyms.c	Mon Nov 25 15:16:27 2002
@@ -601,3 +601,7 @@
 
 /* debug */
 EXPORT_SYMBOL(dump_stack);
+
+#ifdef CONFIG_FI
+EXPORT_SYMBOL(module_list);
+#endif