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-rw-r--r--js/src/jsapi.h2
-rw-r--r--js/src/jsfun.cpp4
-rw-r--r--js/src/jsscript.cpp50
-rw-r--r--js/src/shell/js.cpp4
-rw-r--r--js/src/vm/Xdr.h20
5 files changed, 57 insertions, 23 deletions
diff --git a/js/src/jsapi.h b/js/src/jsapi.h
index 9ad3e757f..089e22b09 100644
--- a/js/src/jsapi.h
+++ b/js/src/jsapi.h
@@ -5927,7 +5927,7 @@ enum TranscodeResult
TranscodeResult_Failure_BadBuildId = TranscodeResult_Failure | 0x1,
TranscodeResult_Failure_RunOnceNotSupported = TranscodeResult_Failure | 0x2,
TranscodeResult_Failure_AsmJSNotSupported = TranscodeResult_Failure | 0x3,
- TranscodeResult_Failure_UnknownClassKind = TranscodeResult_Failure | 0x4,
+ TranscodeResult_Failure_BadDecode = TranscodeResult_Failure | 0x4,
// A error, the JSContext has a pending exception.
TranscodeResult_Throw = 0x200
diff --git a/js/src/jsfun.cpp b/js/src/jsfun.cpp
index 9fffce448..c952441ad 100644
--- a/js/src/jsfun.cpp
+++ b/js/src/jsfun.cpp
@@ -641,6 +641,10 @@ js::XDRInterpretedFunction(XDRState<mode>* xdr, HandleScope enclosingScope,
objp.set(fun);
}
+ // Verify marker at end of function to detect buffer truncation.
+ if (!xdr->codeMarker(0xA0129CD1))
+ return false;
+
return true;
}
diff --git a/js/src/jsscript.cpp b/js/src/jsscript.cpp
index 2e02aa63d..10821f26a 100644
--- a/js/src/jsscript.cpp
+++ b/js/src/jsscript.cpp
@@ -75,24 +75,19 @@ js::XDRScriptConst(XDRState<mode>* xdr, MutableHandleValue vp)
{
JSContext* cx = xdr->cx();
- /*
- * A script constant can be an arbitrary primitive value as they are used
- * to implement JSOP_LOOKUPSWITCH. But they cannot be objects, see
- * bug 407186.
- */
enum ConstTag {
- SCRIPT_INT = 0,
- SCRIPT_DOUBLE = 1,
- SCRIPT_ATOM = 2,
- SCRIPT_TRUE = 3,
- SCRIPT_FALSE = 4,
- SCRIPT_NULL = 5,
- SCRIPT_OBJECT = 6,
- SCRIPT_VOID = 7,
- SCRIPT_HOLE = 8
+ SCRIPT_INT,
+ SCRIPT_DOUBLE,
+ SCRIPT_ATOM,
+ SCRIPT_TRUE,
+ SCRIPT_FALSE,
+ SCRIPT_NULL,
+ SCRIPT_OBJECT,
+ SCRIPT_VOID,
+ SCRIPT_HOLE
};
- uint32_t tag;
+ ConstTag tag;
if (mode == XDR_ENCODE) {
if (vp.isInt32()) {
tag = SCRIPT_INT;
@@ -116,7 +111,7 @@ js::XDRScriptConst(XDRState<mode>* xdr, MutableHandleValue vp)
}
}
- if (!xdr->codeUint32(&tag))
+ if (!xdr->codeEnum32(&tag))
return false;
switch (tag) {
@@ -182,6 +177,10 @@ js::XDRScriptConst(XDRState<mode>* xdr, MutableHandleValue vp)
if (mode == XDR_DECODE)
vp.setMagic(JS_ELEMENTS_HOLE);
break;
+ default:
+ // Fail in debug, but only soft-fail in release
+ MOZ_ASSERT(false, "Bad XDR value kind");
+ return xdr->fail(JS::TranscodeResult_Failure_BadDecode);
}
return true;
}
@@ -742,11 +741,20 @@ js::XDRScript(XDRState<mode>* xdr, HandleScope scriptEnclosingScope, HandleScrip
case ScopeKind::Module:
MOZ_CRASH("NYI");
break;
+ default:
+ // Fail in debug, but only soft-fail in release
+ MOZ_ASSERT(false, "Bad XDR scope kind");
+ return xdr->fail(JS::TranscodeResult_Failure_BadDecode);
}
if (mode == XDR_DECODE)
vector[i].init(scope);
}
+
+ // Verify marker to detect data corruption after decoding scope data. A
+ // mismatch here indicates we will almost certainly crash in release.
+ if (!xdr->codeMarker(0xF81F7F5A))
+ return false;
}
/*
@@ -832,12 +840,18 @@ js::XDRScript(XDRState<mode>* xdr, HandleScope scriptEnclosingScope, HandleScrip
}
default: {
- MOZ_ASSERT(false, "Unknown class kind.");
- return xdr->fail(JS::TranscodeResult_Failure_UnknownClassKind);
+ // Fail in debug, but only soft-fail in release
+ MOZ_ASSERT(false, "Bad XDR class kind");
+ return xdr->fail(JS::TranscodeResult_Failure_BadDecode);
}
}
}
+ // Verify marker to detect data corruption after decoding object data. A
+ // mismatch here indicates we will almost certainly crash in release.
+ if (!xdr->codeMarker(0x223DB179))
+ return false;
+
if (ntrynotes != 0) {
JSTryNote* tnfirst = script->trynotes()->vector;
MOZ_ASSERT(script->trynotes()->length == ntrynotes);
diff --git a/js/src/shell/js.cpp b/js/src/shell/js.cpp
index 88d482a23..3f56981cd 100644
--- a/js/src/shell/js.cpp
+++ b/js/src/shell/js.cpp
@@ -1546,9 +1546,9 @@ ConvertTranscodeResultToJSException(JSContext* cx, JS::TranscodeResult rv)
MOZ_ASSERT(!cx->isExceptionPending());
JS_ReportErrorASCII(cx, "Asm.js is not supported by XDR");
return false;
- case JS::TranscodeResult_Failure_UnknownClassKind:
+ case JS::TranscodeResult_Failure_BadDecode:
MOZ_ASSERT(!cx->isExceptionPending());
- JS_ReportErrorASCII(cx, "Unknown class kind, go fix it.");
+ JS_ReportErrorASCII(cx, "XDR data corruption");
return false;
case JS::TranscodeResult_Throw:
diff --git a/js/src/vm/Xdr.h b/js/src/vm/Xdr.h
index 8e8c5bf17..2a5c62480 100644
--- a/js/src/vm/Xdr.h
+++ b/js/src/vm/Xdr.h
@@ -143,13 +143,17 @@ class XDRState {
template <typename T>
bool codeEnum32(T* val, typename mozilla::EnableIf<mozilla::IsEnum<T>::value, T>::Type * = NULL)
{
+ // Mix the enumeration value with a random magic number, such that a
+ // corruption with a low-ranged value (like 0) is less likely to cause a
+ // miss-interpretation of the XDR content and instead cause a failure.
+ const uint32_t MAGIC = 0xAF647BCE;
uint32_t tmp;
if (mode == XDR_ENCODE)
- tmp = uint32_t(*val);
+ tmp = uint32_t(*val) ^ MAGIC;
if (!codeUint32(&tmp))
return false;
if (mode == XDR_DECODE)
- *val = T(tmp);
+ *val = T(tmp ^ MAGIC);
return true;
}
@@ -167,6 +171,18 @@ class XDRState {
return true;
}
+ bool codeMarker(uint32_t magic) {
+ uint32_t actual = magic;
+ if (!codeUint32(&actual))
+ return false;
+ if (actual != magic) {
+ // Fail in debug, but only soft-fail in release
+ MOZ_ASSERT(false, "Bad XDR marker");
+ return fail(JS::TranscodeResult_Failure_BadDecode);
+ }
+ return true;
+ }
+
bool codeBytes(void* bytes, size_t len) {
if (len == 0)
return true;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 10:57:40 +0000