Attachment 343093 Details for Bug 186540 – Patch

[patch] Patch

bug-186540-20180619224909.patch (text/plain), 3.76 KB, created by Tadeu Zagallo on 2018-06-19 13:49:11 PDT

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Creator: Tadeu Zagallo

Created: 2018-06-19 13:49:11 PDT

Size: 3.76 KB

patch

obsolete

>Subversion Revision: 232892
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 8269510ccccf9e87a1b566b5a455d82f6e5bd852..00aef3de199a15d1ac746343f6a0884a21225963 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,20 @@
>+2018-06-19  Tadeu Zagallo  <tzagallo@apple.com>
>+
>+        ShadowChicken crashes with stack overflow in the LLInt
>+        https://bugs.webkit.org/show_bug.cgi?id=186540
>+        <rdar://problem/39682133>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Stack overflows in the LLInt were crashing in ShadowChicken when compiling
>+        with debug opcodes because it was accessing the scope of the incomplete top
>+        frame, which hadn't been set yet. Check that we have moved past the first
>+        opcode (enter) and that the scope is not undefined (enter will
>+        initialize it to undefined).
>+
>+        * interpreter/ShadowChicken.cpp:
>+        (JSC::ShadowChicken::update):
>+
> 2018-06-15  Saam Barati  <sbarati@apple.com>
> 
>         Make ForceOSRExit CFG pruning in bytecode parser more aggressive by making the original block to ignore be the plan's osrEntryBytecodeIndex
>diff --git a/Source/JavaScriptCore/interpreter/ShadowChicken.cpp b/Source/JavaScriptCore/interpreter/ShadowChicken.cpp
>index e3443f1891d1756b03dff8fa6a2285ca8e55dcb1..e5d01660d1ff8293c2ec9f9a133a8f9314f37efb 100644
>--- a/Source/JavaScriptCore/interpreter/ShadowChicken.cpp
>+++ b/Source/JavaScriptCore/interpreter/ShadowChicken.cpp
>@@ -300,8 +300,11 @@ void ShadowChicken::update(VM& vm, ExecState* exec)
>             bool isTailDeleted = false;
>             JSScope* scope = nullptr;
>             CodeBlock* codeBlock = callFrame->codeBlock();
>-            if (codeBlock && codeBlock->wasCompiledWithDebuggingOpcodes() && codeBlock->scopeRegister().isValid()) {
>-                scope = callFrame->scope(codeBlock->scopeRegister().offset());
>+            JSValue scopeValue = callFrame->bytecodeOffset() && codeBlock && codeBlock->scopeRegister().isValid()
>+                ? callFrame->registers()[codeBlock->scopeRegister().offset()].jsValue()
>+                : jsUndefined();
>+            if (scopeValue.isUndefined() && codeBlock->wasCompiledWithDebuggingOpcodes() && !scopeValue.isUndefined()) {
>+                scope = jsCast<JSScope*>(scopeValue.asCell());
>                 RELEASE_ASSERT(scope->inherits<JSScope>(vm));
>             } else if (foundFrame) {
>                 scope = m_log[indexInLog].scope;
>diff --git a/JSTests/ChangeLog b/JSTests/ChangeLog
>index 1e3361169b6966070b13c2386d5ef3798a82589b..0bdbfccc23301ae5d279851b2254b77ce10b10f0 100644
>--- a/JSTests/ChangeLog
>+++ b/JSTests/ChangeLog
>@@ -1,3 +1,18 @@
>+2018-06-19  Tadeu Zagallo  <tzagallo@apple.com>
>+
>+        ShadowChicken crashes with stack overflow in the LLInt
>+        https://bugs.webkit.org/show_bug.cgi?id=186540
>+        <rdar://problem/39682133>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Add test that stack overflows and crashes on ShadowChicken when JIT is
>+        disabled and forceDebuggerBytecodeGeneration is enabled.
>+
>+        * stress/llint-stack-overflow-debugging-opcodes.js: Added.
>+        (foo):
>+        (catch):
>+
> 2018-06-14  Leo Balter  <leonardo.balter@gmail.com>
> 
>         Test262-Runner: Update config list with some failing tests
>diff --git a/JSTests/stress/llint-stack-overflow-debugging-opcodes.js b/JSTests/stress/llint-stack-overflow-debugging-opcodes.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..bd9cfe227f4cb0cfa6822dab9df1ab8f52d7e83b
>--- /dev/null
>+++ b/JSTests/stress/llint-stack-overflow-debugging-opcodes.js
>@@ -0,0 +1,8 @@
>+//@ runNoCJIT("--forceDebuggerBytecodeGeneration=true", "--useBaselineJIT=0", "--alwaysUseShadowChicken=true")
>+
>+function foo() {
>+    foo()
>+}
>+try {
>+    foo();
>+} catch(e) { }

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