UserspaceEmulator: Don't scan text segment for malloc leaks

There will be no (true positive) malloc addresses in the text segment.

DevTools/UserspaceEmulator/Emulator.cpp

@@ -108,6 +108,8 @@ bool Emulator::load_elf()
     m_elf->image().for_each_program_header([&](const ELF::Image::ProgramHeader& program_header) {
         if (program_header.type() == PT_LOAD) {
             auto region = make<SimpleRegion>(program_header.vaddr().get(), program_header.size_in_memory());
+            if (program_header.is_executable() && !program_header.is_writable())
+                region->set_text(true);
             memcpy(region->data(), program_header.raw_data(), program_header.size_in_image());
             mmu().add_region(move(region));
             return;

DevTools/UserspaceEmulator/MallocTracer.cpp

@@ -163,6 +163,8 @@ bool MallocTracer::is_reachable(const Mallocation& mallocation) const
         // Skip the stack
         if (region.is_stack())
             return IterationDecision::Continue;
+        if (region.is_text())
+            return IterationDecision::Continue;
         // Skip malloc blocks
         if (region.is_mmap() && static_cast<const MmapRegion&>(region).is_malloc_block())
             return IterationDecision::Continue;

DevTools/UserspaceEmulator/SoftMMU.h

@@ -63,6 +63,9 @@ public:
         bool is_stack() const { return m_stack; }
         void set_stack(bool b) { m_stack = b; }
 
+        bool is_text() const { return m_text; }
+        void set_text(bool b) { m_text = b; }
+
     protected:
         Region(u32 base, u32 size)
             : m_base(base)
@@ -75,6 +78,7 @@ public:
         u32 m_size { 0 };
 
         bool m_stack { false };
+        bool m_text { false };
     };
 
     u8 read8(X86::LogicalAddress);