From d69dd81fb1aef3b8fa97404d0c31401c3abfc252 Mon Sep 17 00:00:00 2001
From: Emil Tsalapatis <emil@etsalapatis.com>
Date: Mon, 27 Oct 2025 10:26:02 -0400
Subject: [PATCH] [llvm][AddressSanitizer] add default shadow mapping offset
 for BPF target

---
 llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index 7c364f86fb0e8..d492f0de3a8c7 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -503,6 +503,7 @@ static ShadowMapping getShadowMapping(const Triple &TargetTriple, int LongSize,
   bool IsAMDGPU = TargetTriple.isAMDGPU();
   bool IsHaiku = TargetTriple.isOSHaiku();
   bool IsWasm = TargetTriple.isWasm();
+  bool IsBPF = TargetTriple.isBPF();
 
   ShadowMapping Mapping;
 
@@ -579,6 +580,8 @@ static ShadowMapping getShadowMapping(const Triple &TargetTriple, int LongSize,
     else if (IsHaiku && IsX86_64)
       Mapping.Offset = (kSmallX86_64ShadowOffsetBase &
                         (kSmallX86_64ShadowOffsetAlignMask << Mapping.Scale));
+    else if (IsBPF)
+      Mapping.Offset = kDynamicShadowSentinel;
     else
       Mapping.Offset = kDefaultShadowOffset64;
   }