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Date:   Wed, 15 Jan 2020 17:57:49 +0100
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com
Cc:     paulmck@...nel.org, andreyknvl@...gle.com, glider@...gle.com,
        dvyukov@...gle.com, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, arnd@...db.de, mpe@...erman.id.au,
        christophe.leroy@....fr, dja@...ens.net, linux-arch@...r.kernel.org
Subject: [PATCH -rcu] asm-generic, kcsan: Add KCSAN instrumentation for bitops

Add explicit KCSAN checks for bitops.

Signed-off-by: Marco Elver <elver@...gle.com>
---
The same patch was previously sent, but at that point the updated bitops
instrumented infrastructure was not yet in mainline:
 http://lkml.kernel.org/r/20191115115524.GA77379@google.com

Note that test_bit() is an atomic bitop, and KCSAN treats it as such,
although it is in the non-atomic header. Currently it cannot be moved:
 http://lkml.kernel.org/r/87pnh5dlmn.fsf@dja-thinkpad.axtens.net
---
 include/asm-generic/bitops/instrumented-atomic.h     | 7 +++++++
 include/asm-generic/bitops/instrumented-lock.h       | 5 +++++
 include/asm-generic/bitops/instrumented-non-atomic.h | 8 ++++++++
 3 files changed, 20 insertions(+)

diff --git a/include/asm-generic/bitops/instrumented-atomic.h b/include/asm-generic/bitops/instrumented-atomic.h
index 18ce3c9e8eec..eb3abf7e5c08 100644
--- a/include/asm-generic/bitops/instrumented-atomic.h
+++ b/include/asm-generic/bitops/instrumented-atomic.h
@@ -12,6 +12,7 @@
 #define _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
 
 #include <linux/kasan-checks.h>
+#include <linux/kcsan-checks.h>
 
 /**
  * set_bit - Atomically set a bit in memory
@@ -26,6 +27,7 @@
 static inline void set_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	arch_set_bit(nr, addr);
 }
 
@@ -39,6 +41,7 @@ static inline void set_bit(long nr, volatile unsigned long *addr)
 static inline void clear_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	arch_clear_bit(nr, addr);
 }
 
@@ -55,6 +58,7 @@ static inline void clear_bit(long nr, volatile unsigned long *addr)
 static inline void change_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	arch_change_bit(nr, addr);
 }
 
@@ -68,6 +72,7 @@ static inline void change_bit(long nr, volatile unsigned long *addr)
 static inline bool test_and_set_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch_test_and_set_bit(nr, addr);
 }
 
@@ -81,6 +86,7 @@ static inline bool test_and_set_bit(long nr, volatile unsigned long *addr)
 static inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch_test_and_clear_bit(nr, addr);
 }
 
@@ -94,6 +100,7 @@ static inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)
 static inline bool test_and_change_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch_test_and_change_bit(nr, addr);
 }
 
diff --git a/include/asm-generic/bitops/instrumented-lock.h b/include/asm-generic/bitops/instrumented-lock.h
index ec53fdeea9ec..2c80dca31e27 100644
--- a/include/asm-generic/bitops/instrumented-lock.h
+++ b/include/asm-generic/bitops/instrumented-lock.h
@@ -12,6 +12,7 @@
 #define _ASM_GENERIC_BITOPS_INSTRUMENTED_LOCK_H
 
 #include <linux/kasan-checks.h>
+#include <linux/kcsan-checks.h>
 
 /**
  * clear_bit_unlock - Clear a bit in memory, for unlock
@@ -23,6 +24,7 @@
 static inline void clear_bit_unlock(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	arch_clear_bit_unlock(nr, addr);
 }
 
@@ -38,6 +40,7 @@ static inline void clear_bit_unlock(long nr, volatile unsigned long *addr)
 static inline void __clear_bit_unlock(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_write(addr + BIT_WORD(nr), sizeof(long));
 	arch___clear_bit_unlock(nr, addr);
 }
 
@@ -53,6 +56,7 @@ static inline void __clear_bit_unlock(long nr, volatile unsigned long *addr)
 static inline bool test_and_set_bit_lock(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch_test_and_set_bit_lock(nr, addr);
 }
 
@@ -72,6 +76,7 @@ static inline bool
 clear_bit_unlock_is_negative_byte(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch_clear_bit_unlock_is_negative_byte(nr, addr);
 }
 /* Let everybody know we have it. */
diff --git a/include/asm-generic/bitops/instrumented-non-atomic.h b/include/asm-generic/bitops/instrumented-non-atomic.h
index 95ff28d128a1..8479af8b3309 100644
--- a/include/asm-generic/bitops/instrumented-non-atomic.h
+++ b/include/asm-generic/bitops/instrumented-non-atomic.h
@@ -12,6 +12,7 @@
 #define _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H
 
 #include <linux/kasan-checks.h>
+#include <linux/kcsan-checks.h>
 
 /**
  * __set_bit - Set a bit in memory
@@ -25,6 +26,7 @@
 static inline void __set_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_write(addr + BIT_WORD(nr), sizeof(long));
 	arch___set_bit(nr, addr);
 }
 
@@ -40,6 +42,7 @@ static inline void __set_bit(long nr, volatile unsigned long *addr)
 static inline void __clear_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_write(addr + BIT_WORD(nr), sizeof(long));
 	arch___clear_bit(nr, addr);
 }
 
@@ -55,6 +58,7 @@ static inline void __clear_bit(long nr, volatile unsigned long *addr)
 static inline void __change_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_write(addr + BIT_WORD(nr), sizeof(long));
 	arch___change_bit(nr, addr);
 }
 
@@ -69,6 +73,7 @@ static inline void __change_bit(long nr, volatile unsigned long *addr)
 static inline bool __test_and_set_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch___test_and_set_bit(nr, addr);
 }
 
@@ -83,6 +88,7 @@ static inline bool __test_and_set_bit(long nr, volatile unsigned long *addr)
 static inline bool __test_and_clear_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch___test_and_clear_bit(nr, addr);
 }
 
@@ -97,6 +103,7 @@ static inline bool __test_and_clear_bit(long nr, volatile unsigned long *addr)
 static inline bool __test_and_change_bit(long nr, volatile unsigned long *addr)
 {
 	kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_write(addr + BIT_WORD(nr), sizeof(long));
 	return arch___test_and_change_bit(nr, addr);
 }
 
@@ -108,6 +115,7 @@ static inline bool __test_and_change_bit(long nr, volatile unsigned long *addr)
 static inline bool test_bit(long nr, const volatile unsigned long *addr)
 {
 	kasan_check_read(addr + BIT_WORD(nr), sizeof(long));
+	kcsan_check_atomic_read(addr + BIT_WORD(nr), sizeof(long));
 	return arch_test_bit(nr, addr);
 }
 
-- 
2.25.0.rc1.283.g88dfdc4193-goog

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