From be3ae64121dba3d294be7519a1af093efec5ac85 Mon Sep 17 00:00:00 2001
From: vsadov <8218165+VSadov@users.noreply.github.com>
Date: Fri, 10 Oct 2025 16:23:41 -0700
Subject: [PATCH 1/2] Use truncating sprintf to make resumption stub names

---
 src/coreclr/vm/jitinterface.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/coreclr/vm/jitinterface.cpp b/src/coreclr/vm/jitinterface.cpp
index f0e6abfd342a03..4d8cad67c8d58b 100644
--- a/src/coreclr/vm/jitinterface.cpp
+++ b/src/coreclr/vm/jitinterface.cpp
@@ -14822,7 +14822,7 @@ CORINFO_METHOD_HANDLE CEEJitInfo::getAsyncResumptionStub()
 #endif // FEATURE_TIERED_COMPILATION
 
     char name[256];
-    int numWritten = sprintf_s(name, ARRAY_SIZE(name), "IL_STUB_AsyncResume_%s_%s", m_pMethodBeingCompiled->GetName(), optimizationTierName);
+    int numWritten = _snprintf_s(name, ARRAY_SIZE(name), _TRUNCATE, "IL_STUB_AsyncResume_%s_%s", m_pMethodBeingCompiled->GetName(), optimizationTierName);
     if (numWritten != -1)
     {
         AllocMemTracker amTracker;

From e1ce7c0055a4d83667ab34ae7570203fa97b1b53 Mon Sep 17 00:00:00 2001
From: vsadov <8218165+VSadov@users.noreply.github.com>
Date: Tue, 14 Oct 2025 14:34:23 -0700
Subject: [PATCH 2/2] make sure the resumption stub's name fits instead of
 truncating.

---
 src/coreclr/vm/jitinterface.cpp | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/src/coreclr/vm/jitinterface.cpp b/src/coreclr/vm/jitinterface.cpp
index 4d8cad67c8d58b..13056359ff6234 100644
--- a/src/coreclr/vm/jitinterface.cpp
+++ b/src/coreclr/vm/jitinterface.cpp
@@ -14821,19 +14821,20 @@ CORINFO_METHOD_HANDLE CEEJitInfo::getAsyncResumptionStub()
     }
 #endif // FEATURE_TIERED_COMPILATION
 
-    char name[256];
-    int numWritten = _snprintf_s(name, ARRAY_SIZE(name), _TRUNCATE, "IL_STUB_AsyncResume_%s_%s", m_pMethodBeingCompiled->GetName(), optimizationTierName);
-    if (numWritten != -1)
-    {
-        AllocMemTracker amTracker;
-        void* allocedMem = amTracker.Track(m_pMethodBeingCompiled->GetLoaderAllocator()->GetLowFrequencyHeap()->AllocMem(S_SIZE_T(numWritten + 1)));
-        memcpy(allocedMem, name, (size_t)(numWritten + 1));
-        result->AsDynamicMethodDesc()->SetMethodName((LPCUTF8)allocedMem);
-        amTracker.SuppressRelease();
-    }
-
 #ifdef _DEBUG
-    LOG((LF_STUBS, LL_INFO1000, "ASYNC: Resumption stub %s created\n", name));
+    LPCUTF8 methodName = m_pMethodBeingCompiled->GetName();
+    size_t stubNameLen = STRING_LENGTH("IL_STUB_AsyncResume__");
+    stubNameLen += strlen(methodName);
+    stubNameLen += strlen(optimizationTierName);
+    stubNameLen++; // "\n"
+
+    AllocMemTracker amTrackerName;
+    char* allocedMem = (char*)amTrackerName.Track(m_pMethodBeingCompiled->GetLoaderAllocator()->GetLowFrequencyHeap()->AllocMem(S_SIZE_T(stubNameLen)));
+    sprintf_s(allocedMem, stubNameLen, "IL_STUB_AsyncResume_%s_%s", m_pMethodBeingCompiled->GetName(), optimizationTierName);
+    result->AsDynamicMethodDesc()->SetMethodName((LPCUTF8)allocedMem);
+    amTrackerName.SuppressRelease();
+
+    LOG((LF_STUBS, LL_INFO1000, "ASYNC: Resumption stub %s created\n", allocedMem));
     sl.LogILStub(CORJIT_FLAGS());
 #endif