Report that kernel is tainted if there was an OOPS

If the kernel OOPSed or BUGed then it probably should be considered as
tainted.  Thus, all subsequent OOPSes and SysRq dumps will report the
tainted kernel.  This saves a lot of time explaining oddities in the
calltraces.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Added parisc patch from Matthew Wilson  -Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

21 files changed, 24 insertions, 2 deletions

diff --git a/Documentation/oops-tracing.txt b/Documentation/oops-tracing.txt
index 23e6dde..7f60dfe 100644
--- a/Documentation/oops-tracing.txt
+++ b/Documentation/oops-tracing.txt
@@ -251,6 +251,8 @@ characters, each representing a particular tainted value.
   7: 'U' if a user or user application specifically requested that the
      Tainted flag be set, ' ' otherwise.
 
+  8: 'D' if the kernel has died recently, i.e. there was an OOPS or BUG.
+
 The primary reason for the 'Tainted: ' string is to tell kernel
 debuggers if this is a clean kernel or if anything unusual has
 occurred.  Tainting is permanent: even if an offending module is
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index d6e665d..ec0f05e 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -184,6 +184,7 @@ die_if_kernel(char * str, struct pt_regs *regs, long err, unsigned long *r9_15)
 #endif
 	printk("%s(%d): %s %ld\n", current->comm, current->pid, str, err);
 	dik_show_regs(regs, r9_15);
+	add_taint(TAINT_DIE);
 	dik_show_trace((unsigned long *)(regs+1));
 	dik_show_code((unsigned int *)regs->pc);
 
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 237f499..f2114bc 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -249,6 +249,7 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
 	bust_spinlocks(1);
 	__die(str, err, thread, regs);
 	bust_spinlocks(0);
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die_lock);
 
 	if (in_interrupt())
diff --git a/arch/arm26/kernel/traps.c b/arch/arm26/kernel/traps.c
index d594fb5..2911e2e 100644
--- a/arch/arm26/kernel/traps.c
+++ b/arch/arm26/kernel/traps.c
@@ -185,6 +185,7 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
 	printk("Internal error: %s: %x\n", str, err);
 	printk("CPU: %d\n", smp_processor_id());
 	show_regs(regs);
+	add_taint(TAINT_DIE);
 	printk("Process %s (pid: %d, stack limit = 0x%p)\n",
 		current->comm, current->pid, end_of_stack(tsk));
 
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index aaa7928..9a73ce7 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -56,6 +56,7 @@ void NORET_TYPE die(const char *str, struct pt_regs *regs, long err)
 	show_regs_log_lvl(regs, KERN_EMERG);
 	show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG);
 	bust_spinlocks(0);
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die_lock);
 
 	if (in_interrupt())
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 28bd1c5..18c1c28 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -433,6 +433,7 @@ void die(const char * str, struct pt_regs * regs, long err)
 
 	bust_spinlocks(0);
 	die.lock_owner = -1;
+	add_taint(TAINT_DIE);
 	spin_unlock_irqrestore(&die.lock, flags);
 
 	if (!regs)
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index 15ad85d..3aeaf15 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -69,6 +69,7 @@ die (const char *str, struct pt_regs *regs, long err)
 
 	bust_spinlocks(0);
 	die.lock_owner = -1;
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die.lock);
 
 	if (panic_on_oops)
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index a27a4fa..4e2752a 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -1170,6 +1170,7 @@ void die_if_kernel (char *str, struct pt_regs *fp, int nr)
 	console_verbose();
 	printk("%s: %08x\n",str,nr);
 	show_registers(fp);
+	add_taint(TAINT_DIE);
 	do_exit(SIGSEGV);
 }
 
diff --git a/arch/m68knommu/kernel/traps.c b/arch/m68knommu/kernel/traps.c
index bed5f47..fde04e1 100644
--- a/arch/m68knommu/kernel/traps.c
+++ b/arch/m68knommu/kernel/traps.c
@@ -83,6 +83,7 @@ void die_if_kernel(char *str, struct pt_regs *fp, int nr)
 	printk(KERN_EMERG "Process %s (pid: %d, stackpage=%08lx)\n",
 		current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
 	show_stack(NULL, (unsigned long *)fp);
+	add_taint(TAINT_DIE);
 	do_exit(SIGSEGV);
 }
 
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 37c562c..ce277cb 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -326,6 +326,7 @@ void __noreturn die(const char * str, struct pt_regs * regs)
 #endif /* CONFIG_MIPS_MT_SMTC */
 	printk("%s[#%d]:\n", str, ++die_counter);
 	show_registers(regs);
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die_lock);
 
 	if (in_interrupt())
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index f9bca2d..bbf029a 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -264,6 +264,7 @@ KERN_CRIT "                     ||     ||\n");
 
 	show_regs(regs);
 	dump_stack();
+	add_taint(TAINT_DIE);
 
 	if (in_interrupt())
 		panic("Fatal exception in interrupt");
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 3b8427e..2bb1cb9 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -149,6 +149,7 @@ int die(const char *str, struct pt_regs *regs, long err)
 
 	bust_spinlocks(0);
 	die.lock_owner = -1;
+	add_taint(TAINT_DIE);
 	spin_unlock_irqrestore(&die.lock, flags);
 
 	if (kexec_should_crash(current) ||
diff --git a/arch/ppc/kernel/traps.c b/arch/ppc/kernel/traps.c
index 0eaef7c..3f3b292 100644
--- a/arch/ppc/kernel/traps.c
+++ b/arch/ppc/kernel/traps.c
@@ -92,6 +92,7 @@ int die(const char * str, struct pt_regs * fp, long err)
 	if (nl)
 		printk("\n");
 	show_regs(fp);
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die_lock);
 	/* do_exit() should take care of panic'ing from an interrupt
 	 * context so we don't handle it here
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 81e03b9..8ec9def 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -262,6 +262,7 @@ void die(const char * str, struct pt_regs * regs, long err)
 	print_modules();
 	show_regs(regs);
 	bust_spinlocks(0);
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die_lock);
 	if (in_interrupt())
 		panic("Fatal exception in interrupt");
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index 05a40f3..502d43e 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -103,6 +103,7 @@ void die(const char * str, struct pt_regs * regs, long err)
 			 (unsigned long)task_stack_page(current));
 
 	bust_spinlocks(0);
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die_lock);
 
 	if (kexec_should_crash(current))
diff --git a/arch/sparc/kernel/traps.c b/arch/sparc/kernel/traps.c
index dc9ffea..3bc3bff 100644
--- a/arch/sparc/kernel/traps.c
+++ b/arch/sparc/kernel/traps.c
@@ -101,6 +101,7 @@ void die_if_kernel(char *str, struct pt_regs *regs)
 
 	printk("%s(%d): %s [#%d]\n", current->comm, current->pid, str, ++die_counter);
 	show_regs(regs);
+	add_taint(TAINT_DIE);
 
 	__SAVE; __SAVE; __SAVE; __SAVE;
 	__SAVE; __SAVE; __SAVE; __SAVE;
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 00a9e32..6ef2d29 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -2225,6 +2225,7 @@ void die_if_kernel(char *str, struct pt_regs *regs)
 	notify_die(DIE_OOPS, str, regs, 0, 255, SIGSEGV);
 	__asm__ __volatile__("flushw");
 	__show_regs(regs);
+	add_taint(TAINT_DIE);
 	if (regs->tstate & TSTATE_PRIV) {
 		struct reg_window *rw = (struct reg_window *)
 			(regs->u_regs[UREG_FP] + STACK_BIAS);
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 7fa155c..6963b64 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -518,6 +518,7 @@ void __kprobes __die(const char * str, struct pt_regs * regs, long err)
 	printk("\n");
 	notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
 	show_registers(regs);
+	add_taint(TAINT_DIE);
 	/* Executive summary in case the oops scrolled away */
 	printk(KERN_ALERT "RIP ");
 	printk_address(regs->rip); 
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 693ab26..c5e62f9 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -482,6 +482,7 @@ void die(const char * str, struct pt_regs * regs, long err)
 	if (!user_mode(regs))
 		show_stack(NULL, (unsigned long*)regs->areg[1]);
 
+	add_taint(TAINT_DIE);
 	spin_unlock_irq(&die_lock);
 
 	if (in_interrupt())
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 7a48525..1eb9cde 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -210,6 +210,7 @@ extern enum system_states {
 #define TAINT_MACHINE_CHECK		(1<<4)
 #define TAINT_BAD_PAGE			(1<<5)
 #define TAINT_USER			(1<<6)
+#define TAINT_DIE			(1<<7)
 
 extern void dump_stack(void);
 
diff --git a/kernel/panic.c b/kernel/panic.c
index 623d182..f64f4c1 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -159,14 +159,15 @@ const char *print_tainted(void)
 {
 	static char buf[20];
 	if (tainted) {
-		snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c",
+		snprintf(buf, sizeof(buf), "Tainted: %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_USER ? 'U' : ' ',
+			tainted & TAINT_DIE ? 'D' : ' ');
 	}
 	else
 		snprintf(buf, sizeof(buf), "Not tainted");