[PATCH 1/3] test/mem: disable ASan when accessing unallocated mem

[David Marchand <david.marchand@redhat.com>]

As described in bugzilla, ASan reports accesses to all memory segment as
invalid, since those parts have not been allocated.
Move __rte_no_asan to rte_common.h and disable ASan on a part of the test.

Bugzilla ID: 880
Fixes: 6cc51b1293ce ("mem: instrument allocator for ASan")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 app/test/test_memory.c       |  5 +++++
 lib/eal/common/malloc_elem.h | 10 ++--------
 lib/eal/include/rte_common.h | 13 +++++++++++++
 3 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/app/test/test_memory.c b/app/test/test_memory.c
index 140ac3f3cf..440e5ef838 100644
--- a/app/test/test_memory.c
+++ b/app/test/test_memory.c
@@ -25,6 +25,11 @@
  * - Try to read all memory; it should not segfault.
  */
 
+/*
+ * ASan complains about accessing unallocated memory.
+ * See: https://bugs.dpdk.org/show_bug.cgi?id=880
+ */
+__rte_no_asan
 static int
 check_mem(const struct rte_memseg_list *msl __rte_unused,
 		const struct rte_memseg *ms, void *arg __rte_unused)
diff --git a/lib/eal/common/malloc_elem.h b/lib/eal/common/malloc_elem.h
index f2aa98821b..228f178418 100644
--- a/lib/eal/common/malloc_elem.h
+++ b/lib/eal/common/malloc_elem.h
@@ -7,6 +7,8 @@
 
 #include <stdbool.h>
 
+#include <rte_common.h>
+
 #define MIN_DATA_SIZE (RTE_CACHE_LINE_SIZE)
 
 /* dummy definition of struct so we can use pointers to it in malloc_elem struct */
@@ -131,12 +133,6 @@ malloc_elem_cookies_ok(const struct malloc_elem *elem)
 #define ASAN_MEM_TO_SHADOW(mem) \
 	RTE_PTR_ADD(ASAN_MEM_SHIFT(mem), ASAN_SHADOW_OFFSET)
 
-#if defined(__clang__)
-#define __rte_no_asan __attribute__((no_sanitize("address", "hwaddress")))
-#else
-#define __rte_no_asan __attribute__((no_sanitize_address))
-#endif
-
 __rte_no_asan
 static inline void
 asan_set_shadow(void *addr, char val)
@@ -276,8 +272,6 @@ old_malloc_size(struct malloc_elem *elem)
 
 #else /* !RTE_MALLOC_ASAN */
 
-#define __rte_no_asan
-
 static inline void
 asan_set_freezone(void *ptr __rte_unused, size_t size __rte_unused) { }
 
diff --git a/lib/eal/include/rte_common.h b/lib/eal/include/rte_common.h
index 67587025ab..d56a7570c0 100644
--- a/lib/eal/include/rte_common.h
+++ b/lib/eal/include/rte_common.h
@@ -267,6 +267,19 @@ static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
  */
 #define __rte_cold __attribute__((cold))
 
+/**
+ * Disable AddressSanitizer on some code
+ */
+#ifdef RTE_MALLOC_ASAN
+#ifdef RTE_CC_CLANG
+#define __rte_no_asan __attribute__((no_sanitize("address", "hwaddress")))
+#else
+#define __rte_no_asan __attribute__((no_sanitize_address))
+#endif
+#else /* ! RTE_MALLOC_ASAN */
+#define __rte_no_asan
+#endif
+
 /*********** Macros for pointer arithmetic ********/
 
 /**
-- 
2.23.0