Merge tag 'lkdtm-next' of...

Merge tag 'lkdtm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into char-misc-next

Kees writes a very short note:

improvements for refcount protections

drivers/misc/Makefile

@@ -60,6 +60,7 @@ lkdtm-$(CONFIG_LKDTM)		+= lkdtm_core.o
 lkdtm-$(CONFIG_LKDTM)		+= lkdtm_bugs.o
 lkdtm-$(CONFIG_LKDTM)		+= lkdtm_heap.o
 lkdtm-$(CONFIG_LKDTM)		+= lkdtm_perms.o
+lkdtm-$(CONFIG_LKDTM)		+= lkdtm_refcount.o
 lkdtm-$(CONFIG_LKDTM)		+= lkdtm_rodata_objcopy.o
 lkdtm-$(CONFIG_LKDTM)		+= lkdtm_usercopy.o
 

drivers/misc/lkdtm.h

@@ -19,12 +19,6 @@ void lkdtm_SOFTLOCKUP(void);
 void lkdtm_HARDLOCKUP(void);
 void lkdtm_SPINLOCKUP(void);
 void lkdtm_HUNG_TASK(void);
-void lkdtm_REFCOUNT_SATURATE_INC(void);
-void lkdtm_REFCOUNT_SATURATE_ADD(void);
-void lkdtm_REFCOUNT_ZERO_DEC(void);
-void lkdtm_REFCOUNT_ZERO_INC(void);
-void lkdtm_REFCOUNT_ZERO_SUB(void);
-void lkdtm_REFCOUNT_ZERO_ADD(void);
 void lkdtm_CORRUPT_LIST_ADD(void);
 void lkdtm_CORRUPT_LIST_DEL(void);
 void lkdtm_CORRUPT_USER_DS(void);
@@ -49,6 +43,27 @@ void lkdtm_EXEC_RODATA(void);
 void lkdtm_EXEC_USERSPACE(void);
 void lkdtm_ACCESS_USERSPACE(void);
 
+/* lkdtm_refcount.c */
+void lkdtm_REFCOUNT_INC_OVERFLOW(void);
+void lkdtm_REFCOUNT_ADD_OVERFLOW(void);
+void lkdtm_REFCOUNT_INC_NOT_ZERO_OVERFLOW(void);
+void lkdtm_REFCOUNT_ADD_NOT_ZERO_OVERFLOW(void);
+void lkdtm_REFCOUNT_DEC_ZERO(void);
+void lkdtm_REFCOUNT_DEC_NEGATIVE(void);
+void lkdtm_REFCOUNT_DEC_AND_TEST_NEGATIVE(void);
+void lkdtm_REFCOUNT_SUB_AND_TEST_NEGATIVE(void);
+void lkdtm_REFCOUNT_INC_ZERO(void);
+void lkdtm_REFCOUNT_ADD_ZERO(void);
+void lkdtm_REFCOUNT_INC_SATURATED(void);
+void lkdtm_REFCOUNT_DEC_SATURATED(void);
+void lkdtm_REFCOUNT_ADD_SATURATED(void);
+void lkdtm_REFCOUNT_INC_NOT_ZERO_SATURATED(void);
+void lkdtm_REFCOUNT_ADD_NOT_ZERO_SATURATED(void);
+void lkdtm_REFCOUNT_DEC_AND_TEST_SATURATED(void);
+void lkdtm_REFCOUNT_SUB_AND_TEST_SATURATED(void);
+void lkdtm_REFCOUNT_TIMING(void);
+void lkdtm_ATOMIC_TIMING(void);
+
 /* lkdtm_rodata.c */
 void lkdtm_rodata_do_nothing(void);
 

drivers/misc/lkdtm_bugs.c

@@ -6,7 +6,6 @@
  */
 #include "lkdtm.h"
 #include <linux/list.h>
-#include <linux/refcount.h>
 #include <linux/sched.h>
 #include <linux/sched/signal.h>
 #include <linux/uaccess.h>
@@ -137,88 +136,6 @@ void lkdtm_HUNG_TASK(void)
 	schedule();
 }
 
-void lkdtm_REFCOUNT_SATURATE_INC(void)
-{
-	refcount_t over = REFCOUNT_INIT(UINT_MAX - 1);
-
-	pr_info("attempting good refcount decrement\n");
-	refcount_dec(&over);
-	refcount_inc(&over);
-
-	pr_info("attempting bad refcount inc overflow\n");
-	refcount_inc(&over);
-	refcount_inc(&over);
-	if (refcount_read(&over) == UINT_MAX)
-		pr_err("Correctly stayed saturated, but no BUG?!\n");
-	else
-		pr_err("Fail: refcount wrapped\n");
-}
-
-void lkdtm_REFCOUNT_SATURATE_ADD(void)
-{
-	refcount_t over = REFCOUNT_INIT(UINT_MAX - 1);
-
-	pr_info("attempting good refcount decrement\n");
-	refcount_dec(&over);
-	refcount_inc(&over);
-
-	pr_info("attempting bad refcount add overflow\n");
-	refcount_add(2, &over);
-	if (refcount_read(&over) == UINT_MAX)
-		pr_err("Correctly stayed saturated, but no BUG?!\n");
-	else
-		pr_err("Fail: refcount wrapped\n");
-}
-
-void lkdtm_REFCOUNT_ZERO_DEC(void)
-{
-	refcount_t zero = REFCOUNT_INIT(1);
-
-	pr_info("attempting bad refcount decrement to zero\n");
-	refcount_dec(&zero);
-	if (refcount_read(&zero) == 0)
-		pr_err("Stayed at zero, but no BUG?!\n");
-	else
-		pr_err("Fail: refcount went crazy\n");
-}
-
-void lkdtm_REFCOUNT_ZERO_SUB(void)
-{
-	refcount_t zero = REFCOUNT_INIT(1);
-
-	pr_info("attempting bad refcount subtract past zero\n");
-	if (!refcount_sub_and_test(2, &zero))
-		pr_info("wrap attempt was noticed\n");
-	if (refcount_read(&zero) == 1)
-		pr_err("Correctly stayed above 0, but no BUG?!\n");
-	else
-		pr_err("Fail: refcount wrapped\n");
-}
-
-void lkdtm_REFCOUNT_ZERO_INC(void)
-{
-	refcount_t zero = REFCOUNT_INIT(0);
-
-	pr_info("attempting bad refcount increment from zero\n");
-	refcount_inc(&zero);
-	if (refcount_read(&zero) == 0)
-		pr_err("Stayed at zero, but no BUG?!\n");
-	else
-		pr_err("Fail: refcount went past zero\n");
-}
-
-void lkdtm_REFCOUNT_ZERO_ADD(void)
-{
-	refcount_t zero = REFCOUNT_INIT(0);
-
-	pr_info("attempting bad refcount addition from zero\n");
-	refcount_add(2, &zero);
-	if (refcount_read(&zero) == 0)
-		pr_err("Stayed at zero, but no BUG?!\n");
-	else
-		pr_err("Fail: refcount went past zero\n");
-}
-
 void lkdtm_CORRUPT_LIST_ADD(void)
 {
 	/*

drivers/misc/lkdtm_core.c

@@ -221,12 +221,25 @@ struct crashtype crashtypes[] = {
 	CRASHTYPE(WRITE_RO),
 	CRASHTYPE(WRITE_RO_AFTER_INIT),
 	CRASHTYPE(WRITE_KERN),
-	CRASHTYPE(REFCOUNT_SATURATE_INC),
-	CRASHTYPE(REFCOUNT_SATURATE_ADD),
-	CRASHTYPE(REFCOUNT_ZERO_DEC),
-	CRASHTYPE(REFCOUNT_ZERO_INC),
-	CRASHTYPE(REFCOUNT_ZERO_SUB),
-	CRASHTYPE(REFCOUNT_ZERO_ADD),
+	CRASHTYPE(REFCOUNT_INC_OVERFLOW),
+	CRASHTYPE(REFCOUNT_ADD_OVERFLOW),
+	CRASHTYPE(REFCOUNT_INC_NOT_ZERO_OVERFLOW),
+	CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_OVERFLOW),
+	CRASHTYPE(REFCOUNT_DEC_ZERO),
+	CRASHTYPE(REFCOUNT_DEC_NEGATIVE),
+	CRASHTYPE(REFCOUNT_DEC_AND_TEST_NEGATIVE),
+	CRASHTYPE(REFCOUNT_SUB_AND_TEST_NEGATIVE),
+	CRASHTYPE(REFCOUNT_INC_ZERO),
+	CRASHTYPE(REFCOUNT_ADD_ZERO),
+	CRASHTYPE(REFCOUNT_INC_SATURATED),
+	CRASHTYPE(REFCOUNT_DEC_SATURATED),
+	CRASHTYPE(REFCOUNT_ADD_SATURATED),
+	CRASHTYPE(REFCOUNT_INC_NOT_ZERO_SATURATED),
+	CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED),
+	CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED),
+	CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED),
+	CRASHTYPE(REFCOUNT_TIMING),
+	CRASHTYPE(ATOMIC_TIMING),
 	CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
 	CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
 	CRASHTYPE(USERCOPY_HEAP_FLAG_TO),