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Date:   Fri, 15 Nov 2019 12:55:24 +0100
From:   Marco Elver <elver@google.com>
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Subject: Re: [PATCH v4 08/10] asm-generic, kcsan: Add KCSAN instrumentation
 for bitops
Message-ID: <20191115115524.GA77379@google.com>
References: <20191114180303.66955-1-elver@google.com>
 <20191114180303.66955-9-elver@google.com>
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Signed-off-by: Marco Elver <elver@google.com>
---
Tentative version of the bitops patch that applies with the new
instrumented bitops infrastructure currently in linux-next. (Note that
that test_bit() is an atomic bitop, but is currently in the wrong
header.)

Otherwise there is no functional change compared to v4 that applies to
mainline.

---
 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);
 }
 
-- 
2.24.0.432.g9d3f5f5b63-goog