core: asan: provide asan_memcpy_unchecked()

Provides asan_memcpy_unchecked() which does a memcpy() that isn't
checked against the tagging in the ASAN shadow area. If ASAN isn't
enabled it's replaced by a direct call to memcpy().

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/core/kernel/asan.c b/core/kernel/asan.c
index c1008887..fe34d57c 100644
--- a/core/kernel/asan.c
+++ b/core/kernel/asan.c
@@ -158,6 +158,19 @@ void *asan_memset_unchecked(void *s, int c, size_t n)
 	return s;
 }
 
+void *asan_memcpy_unchecked(void *__restrict dst, const void *__restrict src,
+			    size_t len)
+{
+	uint8_t *__restrict d = dst;
+	const uint8_t *__restrict s = src;
+	size_t n;
+
+	for (n = 0; n < len; n++)
+		d[n] = s[n];
+
+	return dst;
+}
+
 void asan_start(void)
 {
 	assert(asan_va_base && !asan_active);