[PATCH] Tainted cleanup

From: Alexey Dobriyan
Date: Fri Sep 26 2008 - 19:18:38 EST

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* extrace tainted code in separate place: kernel/tainted.c and
include/linux/tainted.h .

The former won't mess with panic code, the latter won't add useless
stuff to kernel.h which is very often included header.

* export tainted.h to userspace

taint values are userspace-visible via kernel.tainted sysctl,
a program in theory can monitor its value for oopses, warnings et al
which is more reliable than printk ring-buffer.

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

arch/alpha/kernel/traps.c | 1
arch/arm/kernel/process.c | 1
arch/arm/kernel/traps.c | 1
arch/avr32/kernel/process.c | 1
arch/avr32/kernel/traps.c | 1
arch/blackfin/kernel/traps.c | 1
arch/ia64/kernel/process.c | 1
arch/ia64/kernel/traps.c | 1
arch/m68k/kernel/process.c | 1
arch/m68k/kernel/traps.c | 1
arch/m68knommu/kernel/process.c | 1
arch/m68knommu/kernel/traps.c | 1
arch/mips/kernel/traps.c | 1
arch/mips/sgi-ip27/ip27-nmi.c | 1
arch/parisc/kernel/traps.c | 1
arch/powerpc/kernel/process.c | 1
arch/powerpc/kernel/traps.c | 1
arch/s390/kernel/traps.c | 1
arch/sh/kernel/process_32.c | 1
arch/sh/kernel/traps_32.c | 1
arch/sparc/kernel/process.c | 1
arch/sparc/kernel/traps.c | 1
arch/sparc64/kernel/process.c | 1
arch/sparc64/kernel/setup.c | 1
arch/sparc64/kernel/traps.c | 1
arch/um/sys-i386/sysrq.c | 1
arch/um/sys-x86_64/sysrq.c | 1
arch/x86/kernel/cpu/mcheck/k7.c | 1
arch/x86/kernel/cpu/mcheck/mce_64.c | 1
arch/x86/kernel/cpu/mcheck/non-fatal.c | 1
arch/x86/kernel/cpu/mcheck/p4.c | 1
arch/x86/kernel/cpu/mcheck/p5.c | 1
arch/x86/kernel/cpu/mcheck/p6.c | 1
arch/x86/kernel/cpu/mcheck/therm_throt.c | 1
arch/x86/kernel/cpu/mcheck/winchip.c | 1
arch/x86/kernel/process_32.c | 1
arch/x86/kernel/process_64.c | 1
arch/x86/kernel/smpboot.c | 1
arch/x86/kernel/traps_32.c | 1
arch/x86/kernel/traps_64.c | 1
arch/xtensa/kernel/traps.c | 1
drivers/acpi/osl.c | 1
include/linux/Kbuild | 1
include/linux/kernel.h | 14 --------
include/linux/tainted.h | 21 +++++++++++++
kernel/Makefile | 1
kernel/module.c | 1
kernel/panic.c | 46 -----------------------------
kernel/softlockup.c | 1
kernel/sysctl.c | 1
kernel/tainted.c | 49 +++++++++++++++++++++++++++++++
lib/bug.c | 1
mm/page_alloc.c | 1
53 files changed, 120 insertions(+), 59 deletions(-)

--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -11,6 +11,7 @@
#include <linux/jiffies.h>
#include <linux/mm.h>
#include <linux/sched.h>
+#include <linux/tainted.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/smp_lock.h>
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -26,6 +26,7 @@
#include <linux/cpu.h>
#include <linux/elfcore.h>
#include <linux/pm.h>
+#include <linux/tainted.h>
#include <linux/tick.h>
#include <linux/utsname.h>

--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/spinlock.h>
+#include <linux/tainted.h>
#include <linux/personality.h>
#include <linux/kallsyms.h>
#include <linux/delay.h>
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -11,6 +11,7 @@
#include <linux/fs.h>
#include <linux/ptrace.h>
#include <linux/reboot.h>
+#include <linux/tainted.h>
#include <linux/tick.h>
#include <linux/uaccess.h>
#include <linux/unistd.h>
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/sched.h>
+#include <linux/tainted.h>
#include <linux/uaccess.h>

#include <asm/addrspace.h>
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -32,6 +32,7 @@
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
+#include <linux/tainted.h>
#include <asm/traps.h>
#include <asm/cacheflush.h>
#include <asm/blackfin.h>
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -21,6 +21,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/stddef.h>
+#include <linux/tainted.h>
#include <linux/thread_info.h>
#include <linux/unistd.h>
#include <linux/efi.h>
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -10,6 +10,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
+#include <linux/tainted.h>
#include <linux/tty.h>
#include <linux/vt_kern.h> /* For unblank_screen() */
#include <linux/module.h> /* for EXPORT_SYMBOL */
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -19,6 +19,7 @@
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
+#include <linux/tainted.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/user.h>
#include <linux/string.h>
+#include <linux/tainted.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ptrace.h>
--- a/arch/m68knommu/kernel/process.c
+++ b/arch/m68knommu/kernel/process.c
@@ -24,6 +24,7 @@
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
+#include <linux/tainted.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/interrupt.h>
--- a/arch/m68knommu/kernel/traps.c
+++ b/arch/m68knommu/kernel/traps.c
@@ -25,6 +25,7 @@
#include <linux/a.out.h>
#include <linux/user.h>
#include <linux/string.h>
+#include <linux/tainted.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ptrace.h>
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -19,6 +19,7 @@
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
+#include <linux/tainted.h>
#include <linux/kallsyms.h>
#include <linux/bootmem.h>
#include <linux/interrupt.h>
--- a/arch/mips/sgi-ip27/ip27-nmi.c
+++ b/arch/mips/sgi-ip27/ip27-nmi.c
@@ -3,6 +3,7 @@
#include <linux/nodemask.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
+#include <linux/tainted.h>
#include <asm/atomic.h>
#include <asm/sn/types.h>
#include <asm/sn/addrs.h>
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
+#include <linux/tainted.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/console.h>
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -20,6 +20,7 @@
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
+#include <linux/tainted.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -22,6 +22,7 @@
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
+#include <linux/tainted.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/interrupt.h>
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -25,6 +25,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
+#include <linux/tainted.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kdebug.h>
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -16,6 +16,7 @@
#include <linux/kallsyms.h>
#include <linux/kexec.h>
#include <linux/kdebug.h>
+#include <linux/tainted.h>
#include <linux/tick.h>
#include <linux/reboot.h>
#include <linux/fs.h>
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -15,6 +15,7 @@
#include <linux/ptrace.h>
#include <linux/init.h>
#include <linux/spinlock.h>
+#include <linux/tainted.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/io.h>
--- a/arch/sparc/kernel/process.c
+++ b/arch/sparc/kernel/process.c
@@ -20,6 +20,7 @@
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/smp.h>
+#include <linux/tainted.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/pm.h>
--- a/arch/sparc/kernel/traps.c
+++ b/arch/sparc/kernel/traps.c
@@ -14,6 +14,7 @@
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
+#include <linux/tainted.h>
#include <linux/kdebug.h>

#include <asm/delay.h>
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -21,6 +21,7 @@
#include <linux/stddef.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
+#include <linux/tainted.h>
#include <linux/user.h>
#include <linux/reboot.h>
#include <linux/delay.h>
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -13,6 +13,7 @@
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
+#include <linux/tainted.h>
#include <asm/smp.h>
#include <linux/user.h>
#include <linux/screen_info.h>
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/smp.h>
+#include <linux/tainted.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/kdebug.h>
--- a/arch/um/sys-i386/sysrq.c
+++ b/arch/um/sys-i386/sysrq.c
@@ -6,6 +6,7 @@
#include "linux/kernel.h"
#include "linux/smp.h"
#include "linux/sched.h"
+#include "linux/tainted.h"
#include "linux/kallsyms.h"
#include "asm/ptrace.h"
#include "sysrq.h"
--- a/arch/um/sys-x86_64/sysrq.c
+++ b/arch/um/sys-x86_64/sysrq.c
@@ -7,6 +7,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/tainted.h>
#include <linux/utsname.h>
#include <asm/current.h>
#include <asm/ptrace.h>
--- a/arch/x86/kernel/cpu/mcheck/k7.c
+++ b/arch/x86/kernel/cpu/mcheck/k7.c
@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
+#include <linux/tainted.h>

#include <asm/processor.h>
#include <asm/system.h>
--- a/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -11,6 +11,7 @@
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/string.h>
+#include <linux/tainted.h>
#include <linux/rcupdate.h>
#include <linux/kallsyms.h>
#include <linux/sysdev.h>
--- a/arch/x86/kernel/cpu/mcheck/non-fatal.c
+++ b/arch/x86/kernel/cpu/mcheck/non-fatal.c
@@ -14,6 +14,7 @@
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
+#include <linux/tainted.h>
#include <linux/module.h>

#include <asm/processor.h>
--- a/arch/x86/kernel/cpu/mcheck/p4.c
+++ b/arch/x86/kernel/cpu/mcheck/p4.c
@@ -7,6 +7,7 @@
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
+#include <linux/tainted.h>

#include <asm/processor.h>
#include <asm/system.h>
--- a/arch/x86/kernel/cpu/mcheck/p5.c
+++ b/arch/x86/kernel/cpu/mcheck/p5.c
@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
+#include <linux/tainted.h>

#include <asm/processor.h>
#include <asm/system.h>
--- a/arch/x86/kernel/cpu/mcheck/p6.c
+++ b/arch/x86/kernel/cpu/mcheck/p6.c
@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
+#include <linux/tainted.h>

#include <asm/processor.h>
#include <asm/system.h>
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -20,6 +20,7 @@
#include <asm/cpu.h>
#include <linux/notifier.h>
#include <linux/jiffies.h>
+#include <linux/tainted.h>
#include <asm/therm_throt.h>

/* How long to wait between reporting thermal events */
--- a/arch/x86/kernel/cpu/mcheck/winchip.c
+++ b/arch/x86/kernel/cpu/mcheck/winchip.c
@@ -7,6 +7,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
+#include <linux/tainted.h>

#include <asm/processor.h>
#include <asm/system.h>
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -21,6 +21,7 @@
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/slab.h>
+#include <linux/tainted.h>
#include <linux/vmalloc.h>
#include <linux/user.h>
#include <linux/interrupt.h>
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -25,6 +25,7 @@
#include <linux/elfcore.h>
#include <linux/smp.h>
#include <linux/slab.h>
+#include <linux/tainted.h>
#include <linux/user.h>
#include <linux/interrupt.h>
#include <linux/utsname.h>
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -43,6 +43,7 @@
#include <linux/smp.h>
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/tainted.h>
#include <linux/percpu.h>
#include <linux/bootmem.h>
#include <linux/err.h>
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -22,6 +22,7 @@
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/string.h>
+#include <linux/tainted.h>
#include <linux/unwind.h>
#include <linux/delay.h>
#include <linux/errno.h>
--- a/arch/x86/kernel/traps_64.c
+++ b/arch/x86/kernel/traps_64.c
@@ -14,6 +14,7 @@
#include <linux/interrupt.h>
#include <linux/kallsyms.h>
#include <linux/spinlock.h>
+#include <linux/tainted.h>
#include <linux/kprobes.h>
#include <linux/uaccess.h>
#include <linux/utsname.h>
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -28,6 +28,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/stringify.h>
+#include <linux/tainted.h>
#include <linux/kallsyms.h>
#include <linux/delay.h>

--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -44,6 +44,7 @@
#include <linux/list.h>
#include <linux/jiffies.h>
#include <linux/semaphore.h>
+#include <linux/tainted.h>

#include <asm/io.h>
#include <asm/uaccess.h>
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -338,6 +338,7 @@ unifdef-y += stddef.h
unifdef-y += string.h
unifdef-y += synclink.h
unifdef-y += sysctl.h
+unifdef-y += tainted.h
unifdef-y += tcp.h
unifdef-y += time.h
unifdef-y += timex.h
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -235,9 +235,6 @@ extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in
extern int panic_timeout;
extern int panic_on_oops;
extern int panic_on_unrecovered_nmi;
-extern int tainted;
-extern const char *print_tainted(void);
-extern void add_taint(unsigned);
extern int root_mountflags;

/* Values used for system_state */
@@ -250,17 +247,6 @@ extern enum system_states {
SYSTEM_SUSPEND_DISK,
} system_state;

-#define TAINT_PROPRIETARY_MODULE (1<<0)
-#define TAINT_FORCED_MODULE (1<<1)
-#define TAINT_UNSAFE_SMP (1<<2)
-#define TAINT_FORCED_RMMOD (1<<3)
-#define TAINT_MACHINE_CHECK (1<<4)
-#define TAINT_BAD_PAGE (1<<5)
-#define TAINT_USER (1<<6)
-#define TAINT_DIE (1<<7)
-#define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
-#define TAINT_WARN (1<<9)
-
extern void dump_stack(void) __cold;

enum {
new file mode 100644
--- /dev/null
+++ b/include/linux/tainted.h
@@ -0,0 +1,21 @@
+#ifndef __TAINTED_H
+#define __TAINTED_H
+
+#define TAINT_PROPRIETARY_MODULE (1<<0)
+#define TAINT_FORCED_MODULE (1<<1)
+#define TAINT_UNSAFE_SMP (1<<2)
+#define TAINT_FORCED_RMMOD (1<<3)
+#define TAINT_MACHINE_CHECK (1<<4)
+#define TAINT_BAD_PAGE (1<<5)
+#define TAINT_USER (1<<6)
+#define TAINT_DIE (1<<7)
+#define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
+#define TAINT_WARN (1<<9)
+
+#ifdef __KERNEL__
+extern int tainted;
+const char *print_tainted(void);
+void add_taint(unsigned);
+#endif
+
+#endif
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -10,6 +10,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
notifier.o ksysfs.o pm_qos_params.o sched_clock.o
+obj-y += tainted.o

CFLAGS_REMOVE_sched.o = -mno-spe

--- a/kernel/module.c
+++ b/kernel/module.c
@@ -21,6 +21,7 @@
#include <linux/init.h>
#include <linux/kallsyms.h>
#include <linux/sysfs.h>
+#include <linux/tainted.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -15,6 +15,7 @@
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/sysrq.h>
+#include <linux/tainted.h>
#include <linux/interrupt.h>
#include <linux/nmi.h>
#include <linux/kexec.h>
@@ -23,7 +24,6 @@
#include <linux/kallsyms.h>

int panic_on_oops;
-int tainted;
static int pause_on_oops;
static int pause_on_oops_flag;
static DEFINE_SPINLOCK(pause_on_oops_lock);
@@ -143,50 +143,6 @@ NORET_TYPE void panic(const char * fmt, ...)

EXPORT_SYMBOL(panic);

-/**
- * print_tainted - return a string to represent the kernel taint state.
- *
- * 'P' - Proprietary module has been loaded.
- * 'F' - Module has been forcibly loaded.
- * 'S' - SMP with CPUs not designed for SMP.
- * 'R' - User forced a module unload.
- * 'M' - System experienced a machine check exception.
- * 'B' - System has hit bad_page.
- * 'U' - Userspace-defined naughtiness.
- * 'A' - ACPI table overridden.
- * 'W' - Taint on warning.
- *
- * The string is overwritten by the next call to print_taint().
- */
-
-const char *print_tainted(void)
-{
- static char buf[20];
- if (tainted) {
- snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c%c",
- tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
- tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
- tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
- tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
- tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
- tainted & TAINT_BAD_PAGE ? 'B' : ' ',
- tainted & TAINT_USER ? 'U' : ' ',
- tainted & TAINT_DIE ? 'D' : ' ',
- tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
- tainted & TAINT_WARN ? 'W' : ' ');
- }
- else
- snprintf(buf, sizeof(buf), "Not tainted");
- return(buf);
-}
-
-void add_taint(unsigned flag)
-{
- debug_locks = 0; /* can't trust the integrity of the kernel anymore */
- tainted |= flag;
-}
-EXPORT_SYMBOL(add_taint);
-
static int __init pause_on_oops_setup(char *str)
{
pause_on_oops = simple_strtoul(str, NULL, 0);
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -16,6 +16,7 @@
#include <linux/lockdep.h>
#include <linux/notifier.h>
#include <linux/module.h>
+#include <linux/tainted.h>

#include <asm/irq_regs.h>

--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -23,6 +23,7 @@
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
+#include <linux/tainted.h>
#include <linux/proc_fs.h>
#include <linux/security.h>
#include <linux/ctype.h>
new file mode 100644
--- /dev/null
+++ b/kernel/tainted.c
@@ -0,0 +1,49 @@
+#include <linux/debug_locks.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/tainted.h>
+
+int tainted;
+
+/**
+ * print_tainted - return a string to represent the kernel taint state.
+ *
+ * 'P' - Proprietary module has been loaded.
+ * 'F' - Module has been forcibly loaded.
+ * 'S' - SMP with CPUs not designed for SMP.
+ * 'R' - User forced a module unload.
+ * 'M' - System experienced a machine check exception.
+ * 'B' - System has hit bad_page.
+ * 'U' - Userspace-defined naughtiness.
+ * 'A' - ACPI table overridden.
+ * 'W' - Taint on warning.
+ *
+ * The string is overwritten by the next call to print_taint().
+ */
+const char *print_tainted(void)
+{
+ static char buf[20];
+
+ if (tainted) {
+ snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c%c",
+ tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
+ tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
+ tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
+ tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
+ tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
+ tainted & TAINT_BAD_PAGE ? 'B' : ' ',
+ tainted & TAINT_USER ? 'U' : ' ',
+ tainted & TAINT_DIE ? 'D' : ' ',
+ tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
+ tainted & TAINT_WARN ? 'W' : ' ');
+ } else
+ snprintf(buf, sizeof(buf), "Not tainted");
+ return buf;
+}
+
+void add_taint(unsigned flag)
+{
+ debug_locks = 0; /* can't trust the integrity of the kernel anymore */
+ tainted |= flag;
+}
+EXPORT_SYMBOL(add_taint);
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -40,6 +40,7 @@
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/sched.h>
+#include <linux/tainted.h>

extern const struct bug_entry __start___bug_table[], __stop___bug_table[];

--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -25,6 +25,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/suspend.h>
+#include <linux/tainted.h>
#include <linux/pagevec.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
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