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-rw-r--r--js/src/builtin/IntlTimeZoneData.h2
-rw-r--r--js/src/jit/MacroAssembler.cpp6
-rw-r--r--js/src/jit/ProcessExecutableMemory.cpp8
-rw-r--r--js/src/jit/ProcessExecutableMemory.h8
-rw-r--r--js/src/jit/shared/IonAssemblerBuffer.h4
-rw-r--r--js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h32
-rw-r--r--js/src/tests/Intl/DateTimeFormat/timeZone_backward_links.js2
-rw-r--r--js/src/tests/Intl/DateTimeFormat/timeZone_backzone.js2
-rw-r--r--js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js2
-rw-r--r--js/src/tests/Intl/DateTimeFormat/timeZone_notbackward_links.js2
10 files changed, 54 insertions, 14 deletions
diff --git a/js/src/builtin/IntlTimeZoneData.h b/js/src/builtin/IntlTimeZoneData.h
index f92c583df..3d5c1b0d5 100644
--- a/js/src/builtin/IntlTimeZoneData.h
+++ b/js/src/builtin/IntlTimeZoneData.h
@@ -1,5 +1,5 @@
// Generated by make_intl_data.py. DO NOT EDIT.
-// tzdata version = 2018c
+// tzdata version = 2018d
#ifndef builtin_IntlTimeZoneData_h
#define builtin_IntlTimeZoneData_h
diff --git a/js/src/jit/MacroAssembler.cpp b/js/src/jit/MacroAssembler.cpp
index f633b9b7b..9dbbe7624 100644
--- a/js/src/jit/MacroAssembler.cpp
+++ b/js/src/jit/MacroAssembler.cpp
@@ -2214,6 +2214,12 @@ MacroAssembler::finish()
}
MacroAssemblerSpecific::finish();
+
+ MOZ_RELEASE_ASSERT(size() <= MaxCodeBytesPerProcess,
+ "AssemblerBuffer should ensure we don't exceed MaxCodeBytesPerProcess");
+
+ if (bytesNeeded() > MaxCodeBytesPerProcess)
+ setOOM();
}
void
diff --git a/js/src/jit/ProcessExecutableMemory.cpp b/js/src/jit/ProcessExecutableMemory.cpp
index 71c2ab0dc..301541541 100644
--- a/js/src/jit/ProcessExecutableMemory.cpp
+++ b/js/src/jit/ProcessExecutableMemory.cpp
@@ -385,14 +385,6 @@ class PageBitSet
#endif
};
-// Limit on the number of bytes of executable memory to prevent JIT spraying
-// attacks.
-#if JS_BITS_PER_WORD == 32
-static const size_t MaxCodeBytesPerProcess = 128 * 1024 * 1024;
-#else
-static const size_t MaxCodeBytesPerProcess = 1 * 1024 * 1024 * 1024;
-#endif
-
// Per-process executable memory allocator. It reserves a block of memory of
// MaxCodeBytesPerProcess bytes, then allocates/deallocates pages from that.
//
diff --git a/js/src/jit/ProcessExecutableMemory.h b/js/src/jit/ProcessExecutableMemory.h
index 078ce7cb7..a0e2fab98 100644
--- a/js/src/jit/ProcessExecutableMemory.h
+++ b/js/src/jit/ProcessExecutableMemory.h
@@ -17,6 +17,14 @@ namespace jit {
// alignment though.
static const size_t ExecutableCodePageSize = 64 * 1024;
+// Limit on the number of bytes of executable memory to prevent JIT spraying
+// attacks.
+#if JS_BITS_PER_WORD == 32
+static const size_t MaxCodeBytesPerProcess = 128 * 1024 * 1024;
+#else
+static const size_t MaxCodeBytesPerProcess = 1 * 1024 * 1024 * 1024;
+#endif
+
enum class ProtectionSetting {
Protected, // Not readable, writable, or executable.
Writable,
diff --git a/js/src/jit/shared/IonAssemblerBuffer.h b/js/src/jit/shared/IonAssemblerBuffer.h
index cc20e26d2..3a6552696 100644
--- a/js/src/jit/shared/IonAssemblerBuffer.h
+++ b/js/src/jit/shared/IonAssemblerBuffer.h
@@ -181,6 +181,10 @@ class AssemblerBuffer
protected:
virtual Slice* newSlice(LifoAlloc& a) {
+ if (size() > MaxCodeBytesPerProcess - sizeof(Slice)) {
+ fail_oom();
+ return nullptr;
+ }
Slice* tmp = static_cast<Slice*>(a.alloc(sizeof(Slice)));
if (!tmp) {
fail_oom();
diff --git a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
index 8cb557784..fe678fc7d 100644
--- a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
+++ b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
@@ -68,6 +68,33 @@ namespace js {
namespace jit {
+ // AllocPolicy for AssemblerBuffer. OOMs when trying to allocate more than
+ // MaxCodeBytesPerProcess bytes. Use private inheritance to make sure we
+ // explicitly have to expose SystemAllocPolicy methods.
+ class AssemblerBufferAllocPolicy : private SystemAllocPolicy
+ {
+ public:
+ using SystemAllocPolicy::checkSimulatedOOM;
+ using SystemAllocPolicy::reportAllocOverflow;
+ using SystemAllocPolicy::free_;
+
+ template <typename T> T* pod_realloc(T* p, size_t oldSize, size_t newSize) {
+ static_assert(sizeof(T) == 1,
+ "AssemblerBufferAllocPolicy should only be used with byte vectors");
+ MOZ_ASSERT(oldSize <= MaxCodeBytesPerProcess);
+ if (MOZ_UNLIKELY(newSize > MaxCodeBytesPerProcess))
+ return nullptr;
+ return SystemAllocPolicy::pod_realloc<T>(p, oldSize, newSize);
+ }
+ template <typename T> T* pod_malloc(size_t numElems) {
+ static_assert(sizeof(T) == 1,
+ "AssemblerBufferAllocPolicy should only be used with byte vectors");
+ if (MOZ_UNLIKELY(numElems > MaxCodeBytesPerProcess))
+ return nullptr;
+ return SystemAllocPolicy::pod_malloc<T>(numElems);
+ }
+ };
+
class AssemblerBuffer
{
template<size_t size, typename T>
@@ -93,6 +120,9 @@ namespace jit {
void ensureSpace(size_t space)
{
+ // This should only be called with small |space| values to ensure
+ // we don't overflow below.
+ MOZ_ASSERT(space <= 16);
if (MOZ_UNLIKELY(!m_buffer.reserve(m_buffer.length() + space)))
oomDetected();
}
@@ -168,7 +198,7 @@ namespace jit {
m_buffer.clear();
}
- PageProtectingVector<unsigned char, 256, SystemAllocPolicy> m_buffer;
+ PageProtectingVector<unsigned char, 256, AssemblerBufferAllocPolicy> m_buffer;
bool m_oom;
};
diff --git a/js/src/tests/Intl/DateTimeFormat/timeZone_backward_links.js b/js/src/tests/Intl/DateTimeFormat/timeZone_backward_links.js
index 890b1c1d5..7b3a46a60 100644
--- a/js/src/tests/Intl/DateTimeFormat/timeZone_backward_links.js
+++ b/js/src/tests/Intl/DateTimeFormat/timeZone_backward_links.js
@@ -1,7 +1,7 @@
// |reftest| skip-if(!this.hasOwnProperty("Intl"))
// Generated by make_intl_data.py. DO NOT EDIT.
-// tzdata version = 2018c
+// tzdata version = 2018d
const tzMapper = [
x => x,
diff --git a/js/src/tests/Intl/DateTimeFormat/timeZone_backzone.js b/js/src/tests/Intl/DateTimeFormat/timeZone_backzone.js
index 19fd871eb..ed63df921 100644
--- a/js/src/tests/Intl/DateTimeFormat/timeZone_backzone.js
+++ b/js/src/tests/Intl/DateTimeFormat/timeZone_backzone.js
@@ -1,7 +1,7 @@
// |reftest| skip-if(!this.hasOwnProperty("Intl"))
// Generated by make_intl_data.py. DO NOT EDIT.
-// tzdata version = 2018c
+// tzdata version = 2018d
const tzMapper = [
x => x,
diff --git a/js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js b/js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js
index 34425acec..215808765 100644
--- a/js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js
+++ b/js/src/tests/Intl/DateTimeFormat/timeZone_backzone_links.js
@@ -1,7 +1,7 @@
// |reftest| skip-if(!this.hasOwnProperty("Intl"))
// Generated by make_intl_data.py. DO NOT EDIT.
-// tzdata version = 2018c
+// tzdata version = 2018d
const tzMapper = [
x => x,
diff --git a/js/src/tests/Intl/DateTimeFormat/timeZone_notbackward_links.js b/js/src/tests/Intl/DateTimeFormat/timeZone_notbackward_links.js
index 8b2dedec2..48242dfbd 100644
--- a/js/src/tests/Intl/DateTimeFormat/timeZone_notbackward_links.js
+++ b/js/src/tests/Intl/DateTimeFormat/timeZone_notbackward_links.js
@@ -1,7 +1,7 @@
// |reftest| skip-if(!this.hasOwnProperty("Intl"))
// Generated by make_intl_data.py. DO NOT EDIT.
-// tzdata version = 2018c
+// tzdata version = 2018d
const tzMapper = [
x => x,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-23 19:23:53 +0000