From: Sebastian Poeplau <[email protected]>
Address sanitizer requires the memory region configured via sigaltstack to be
8-byte aligned (see ASAN_SHADOW_GRANULARITY and ASAN_SHADOW_SCALE).
gcc/ada/ChangeLog:
* init.c (__gnat_alternate_stack): add alignment attribute.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/init.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/gcc/ada/init.c b/gcc/ada/init.c
index 7aced7fe813..68f37480920 100644
--- a/gcc/ada/init.c
+++ b/gcc/ada/init.c
@@ -594,8 +594,10 @@ __gnat_error_handler (int sig, siginfo_t *si
ATTRIBUTE_UNUSED, void *ucontext)
#ifndef __ia64__
#define HAVE_GNAT_ALTERNATE_STACK 1
-/* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
-char __gnat_alternate_stack[32 * 1024];
+/* Address sanitizer requires the alternate stack to be 8-byte aligned,
+ regardless of any extra alignment added by the operating system. The size
+ must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
+char __gnat_alternate_stack[32 * 1024] __attribute__ ((aligned (8)));
#endif
#ifdef __XENO__
--
2.53.0
