add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/kernel/kcsan/core.c
..
..
@@ -9,10 +9,12 @@
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 #include <linux/init.h>
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 #include <linux/kernel.h>
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 #include <linux/list.h>
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+#include <linux/minmax.h>
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 #include <linux/moduleparam.h>
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 #include <linux/percpu.h>
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 #include <linux/preempt.h>
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 #include <linux/sched.h>
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+#include <linux/string.h>
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 #include <linux/uaccess.h>
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 #include "atomic.h"
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..
@@ -1033,7 +1035,9 @@
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 DEFINE_TSAN_ATOMIC_OPS(8);
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 DEFINE_TSAN_ATOMIC_OPS(16);
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 DEFINE_TSAN_ATOMIC_OPS(32);
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+#ifdef CONFIG_64BIT
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 DEFINE_TSAN_ATOMIC_OPS(64);
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+#endif
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 void __tsan_atomic_thread_fence(int memorder);
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 void __tsan_atomic_thread_fence(int memorder)
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@@ -1045,3 +1049,51 @@
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 void __tsan_atomic_signal_fence(int memorder);
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 void __tsan_atomic_signal_fence(int memorder) { }
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 EXPORT_SYMBOL(__tsan_atomic_signal_fence);
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+
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+#ifdef __HAVE_ARCH_MEMSET
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+void *__tsan_memset(void *s, int c, size_t count);
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+noinline void *__tsan_memset(void *s, int c, size_t count)
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+{
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+	/*
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+	 * Instead of not setting up watchpoints where accessed size is greater
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+	 * than MAX_ENCODABLE_SIZE, truncate checked size to MAX_ENCODABLE_SIZE.
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+	 */
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+	size_t check_len = min_t(size_t, count, MAX_ENCODABLE_SIZE);
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+
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+	check_access(s, check_len, KCSAN_ACCESS_WRITE);
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+	return memset(s, c, count);
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+}
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+#else
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+void *__tsan_memset(void *s, int c, size_t count) __alias(memset);
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+#endif
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+EXPORT_SYMBOL(__tsan_memset);
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+
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+#ifdef __HAVE_ARCH_MEMMOVE
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+void *__tsan_memmove(void *dst, const void *src, size_t len);
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+noinline void *__tsan_memmove(void *dst, const void *src, size_t len)
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+{
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+	size_t check_len = min_t(size_t, len, MAX_ENCODABLE_SIZE);
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+
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+	check_access(dst, check_len, KCSAN_ACCESS_WRITE);
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+	check_access(src, check_len, 0);
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+	return memmove(dst, src, len);
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+}
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+#else
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+void *__tsan_memmove(void *dst, const void *src, size_t len) __alias(memmove);
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+#endif
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+EXPORT_SYMBOL(__tsan_memmove);
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+
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+#ifdef __HAVE_ARCH_MEMCPY
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+void *__tsan_memcpy(void *dst, const void *src, size_t len);
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+noinline void *__tsan_memcpy(void *dst, const void *src, size_t len)
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+{
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+	size_t check_len = min_t(size_t, len, MAX_ENCODABLE_SIZE);
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+
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+	check_access(dst, check_len, KCSAN_ACCESS_WRITE);
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+	check_access(src, check_len, 0);
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+	return memcpy(dst, src, len);
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+}
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+#else
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+void *__tsan_memcpy(void *dst, const void *src, size_t len) __alias(memcpy);
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+#endif
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+EXPORT_SYMBOL(__tsan_memcpy);