[Lldb-commits] [lldb] [lldb] Don't crash when attaching to pid and no binaries found (PR #100287)

via lldb-commits lldb-commits at lists.llvm.org
Tue Jul 23 17:38:14 PDT 2024


llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lldb

Author: Jason Molenda (jasonmolenda)

<details>
<summary>Changes</summary>

There is a narrow window during process launch on macOS where lldb can attach and no binaries will be seen as loaded in the process (none reported by libdyld SPI).  A year ago I made changes to set the new-binary-loaded breakpoint correctly despite this.  But we've seen a crash when this combination is seen, where CommandObjectProcessAttach::DoExecute assumed there was at least one binary registered in the Target.  Fix that.

Also fix two FileSpec API uses from when we didn't have a GetPath() method that returned a std::string, and was copying the filepaths into fixed length buffers.  All of this code was from ~14 years ago when we didn't have that API.

rdar://131631627

---
Full diff: https://github.com/llvm/llvm-project/pull/100287.diff


1 Files Affected:

- (modified) lldb/source/Commands/CommandObjectProcess.cpp (+8-10) 


``````````diff
diff --git a/lldb/source/Commands/CommandObjectProcess.cpp b/lldb/source/Commands/CommandObjectProcess.cpp
index 50695af556939..e605abdb3c771 100644
--- a/lldb/source/Commands/CommandObjectProcess.cpp
+++ b/lldb/source/Commands/CommandObjectProcess.cpp
@@ -369,25 +369,23 @@ class CommandObjectProcessAttach : public CommandObjectProcessLaunchOrAttach {
 
     // Okay, we're done.  Last step is to warn if the executable module has
     // changed:
-    char new_path[PATH_MAX];
     ModuleSP new_exec_module_sp(target->GetExecutableModule());
     if (!old_exec_module_sp) {
       // We might not have a module if we attached to a raw pid...
       if (new_exec_module_sp) {
-        new_exec_module_sp->GetFileSpec().GetPath(new_path, PATH_MAX);
-        result.AppendMessageWithFormat("Executable module set to \"%s\".\n",
-                                       new_path);
+        result.AppendMessageWithFormat(
+            "Executable binary set to \"%s\".\n",
+            new_exec_module_sp->GetFileSpec().GetPath().c_str());
       }
+    } else if (!new_exec_module_sp) {
+      result.AppendWarningWithFormat("No executable binary.");
     } else if (old_exec_module_sp->GetFileSpec() !=
                new_exec_module_sp->GetFileSpec()) {
-      char old_path[PATH_MAX];
-
-      old_exec_module_sp->GetFileSpec().GetPath(old_path, PATH_MAX);
-      new_exec_module_sp->GetFileSpec().GetPath(new_path, PATH_MAX);
 
       result.AppendWarningWithFormat(
-          "Executable module changed from \"%s\" to \"%s\".\n", old_path,
-          new_path);
+          "Executable binary changed from \"%s\" to \"%s\".\n",
+          old_exec_module_sp->GetFileSpec().GetPath().c_str(),
+          new_exec_module_sp->GetFileSpec().GetPath().c_str());
     }
 
     if (!old_arch_spec.IsValid()) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/100287


More information about the lldb-commits mailing list