[PATCH] D98285: [asan] Add an offset for the kernel address sanitizer on FreeBSD

[Mark Johnston via Phabricator via llvm-commits]

markj created this revision.
Herald added subscribers: hiraditya, krytarowski, arichardson, emaste.
markj requested review of this revision.
Herald added a project: LLVM.
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This is based on a WIP port of the sanitizer runtime to the FreeBSD
kernel.

Test Plan:


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D98285

Files:
  llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp


Index: llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
===================================================================
--- llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -108,6 +108,7 @@
 static const uint64_t kRISCV64_ShadowOffset64 = 0x20000000;
 static const uint64_t kFreeBSD_ShadowOffset32 = 1ULL << 30;
 static const uint64_t kFreeBSD_ShadowOffset64 = 1ULL << 46;
+static const uint64_t kFreeBSDKasan_ShadowOffset64 = 0xdffff7c000000000;
 static const uint64_t kNetBSD_ShadowOffset32 = 1ULL << 30;
 static const uint64_t kNetBSD_ShadowOffset64 = 1ULL << 46;
 static const uint64_t kNetBSDKasan_ShadowOffset64 = 0xdfff900000000000;
@@ -493,9 +494,12 @@
       Mapping.Offset = kPPC64_ShadowOffset64;
     else if (IsSystemZ)
       Mapping.Offset = kSystemZ_ShadowOffset64;
-    else if (IsFreeBSD && !IsMIPS64)
-      Mapping.Offset = kFreeBSD_ShadowOffset64;
-    else if (IsNetBSD) {
+    else if (IsFreeBSD && !IsMIPS64) {
+      if (IsKasan)
+        Mapping.Offset = kFreeBSDKasan_ShadowOffset64;
+      else
+        Mapping.Offset = kFreeBSD_ShadowOffset64;
+    } else if (IsNetBSD) {
       if (IsKasan)
         Mapping.Offset = kNetBSDKasan_ShadowOffset64;
       else


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