[Lldb-commits] [PATCH] D93495: CrashReason: Add MTE tag check faults to the list of crash reasons.

[Peter Collingbourne via Phabricator via lldb-commits]

pcc created this revision.
pcc added a reviewer: labath.
Herald added a subscriber: emaste.
pcc requested review of this revision.
Herald added a project: LLDB.

As of Linux 5.10, the kernel may report either of the two following
crash reasons:

- SEGV_MTEAERR: async MTE tag check fault
- SEGV_MTESERR: sync MTE tag check fault

Teach LLDB about them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93495

Files:
  lldb/source/Plugins/Process/POSIX/CrashReason.cpp
  lldb/source/Plugins/Process/POSIX/CrashReason.h


Index: lldb/source/Plugins/Process/POSIX/CrashReason.h
===================================================================
--- lldb/source/Plugins/Process/POSIX/CrashReason.h
+++ lldb/source/Plugins/Process/POSIX/CrashReason.h
@@ -22,6 +22,8 @@
   eInvalidAddress,
   ePrivilegedAddress,
   eBoundViolation,
+  eAsyncTagCheckFault,
+  eSyncTagCheckFault,
 
   // SIGILL crash reasons.
   eIllegalOpcode,
Index: lldb/source/Plugins/Process/POSIX/CrashReason.cpp
===================================================================
--- lldb/source/Plugins/Process/POSIX/CrashReason.cpp
+++ lldb/source/Plugins/Process/POSIX/CrashReason.cpp
@@ -58,6 +58,16 @@
 #endif
   case SEGV_BNDERR:
     return CrashReason::eBoundViolation;
+#ifndef SEGV_MTEAERR
+#define SEGV_MTEAERR 8
+#endif
+  case SEGV_MTEAERR:
+    return CrashReason::eAsyncTagCheckFault;
+#ifndef SEGV_MTESERR
+#define SEGV_MTESERR 9
+#endif
+  case SEGV_MTESERR:
+    return CrashReason::eSyncTagCheckFault;
   }
 
   return CrashReason::eInvalidCrashReason;
@@ -166,6 +176,12 @@
   case CrashReason::eBoundViolation:
     str = "signal SIGSEGV: bound violation";
     break;
+  case CrashReason::eAsyncTagCheckFault:
+    str = "signal SIGSEGV: async tag check fault";
+    break;
+  case CrashReason::eSyncTagCheckFault:
+    str = "signal SIGSEGV: sync tag check fault";
+    break;
   case CrashReason::eIllegalOpcode:
     str = "signal SIGILL: illegal instruction";
     break;
@@ -246,6 +262,12 @@
   case CrashReason::eBoundViolation:
     str = "eBoundViolation";
     break;
+  case CrashReason::eAsyncTagCheckFault:
+    str = "eAsyncTagCheckFault";
+    break;
+  case CrashReason::eSyncTagCheckFault:
+    str = "eSyncTagCheckFault";
+    break;
 
   // SIGILL crash reasons.
   case CrashReason::eIllegalOpcode:


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