RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-06-01 08:28:11 +00:00
Code Issues Activity Actions

Kernel: Mark mmap()-created regions with a special bit

Browse source 
Then only allow regions with that bit to be manipulated via munmap()
and mprotect(). This prevents messing with non-mmap()ed regions in
a process's address space (stacks, shared buffers, ...)
This commit is contained in:
Andreas Kling 2019-11-24 12:24:16 +01:00
parent 35c26a06fc
commit 3dc87be891
2 changed files with 14 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Kernel/VM/Region.h
View file

@ -53,6 +53,9 @@ public:
bool is_stack() const { return m_stack; }
void set_stack(bool stack) { m_stack = stack; }
bool is_mmap() const { return m_mmap; }
void set_mmap(bool mmap) { m_mmap = mmap; }
bool is_user_accessible() const { return m_user_accessible; }
PageFaultResponse handle_fault(const PageFault&);
@ -145,5 +148,6 @@ private:
bool m_shared { false };
bool m_user_accessible { false };
bool m_stack { false };
bool m_mmap { false };
mutable OwnPtr<Bitmap> m_cow_map;
};