From 7a64ac6842776e98f142092abeaf3b6819018052 Mon Sep 17 00:00:00 2001
From: Aleksandr Nogikh <nogikh@google.com>
Date: Fri, 7 Feb 2025 12:22:53 +0100
Subject: [PATCH] sys/targets: increase DataOffset for 64bit builds

It turned out the currently used value hit the high shadow area on arm64
machines.

Closes #5762.
---
 sys/targets/targets.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/targets/targets.go b/sys/targets/targets.go
index 1d79f4f9509a..18b722945877 100644
--- a/sys/targets/targets.go
+++ b/sys/targets/targets.go
@@ -777,7 +777,10 @@ func initTarget(target *Target, OS, arch string) {
 func (target *Target) defaultDataOffset() uint64 {
 	if target.PtrSize == 8 {
 		// An address from ASAN's 64-bit HighMem area.
-		return 0x200000000000
+		// 0x400000000000 works both for arm64 and amd64. We don't run syzkaller tests on any other platform.
+		// During real fuzzing, we don't build with ASAN, so the address should not matter much as long as
+		// it's far enough from the area allocated by malloc().
+		return 0x400000000000
 	}
 	// From 32-bit HighMem area.
 	return 0x80000000