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Kernel: Implement some basic stack pointer validation
VM regions can now be marked as stack regions, which is then validated on syscall, and on page fault. If a thread is caught with its stack pointer pointing into anything that's *not* a Region with its stack bit set, we'll crash the whole process with SIGSTKFLT. Userspace must now allocate custom stacks by using mmap() with the new MAP_STACK flag. This mechanism was first introduced in OpenBSD, and now we have it too, yay! :^)
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12 changed files with 101 additions and 5 deletions
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@ -46,6 +46,7 @@ public:
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void enter_process_paging_scope(Process&);
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bool validate_user_stack(const Process&, VirtualAddress) const;
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bool validate_user_read(const Process&, VirtualAddress) const;
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bool validate_user_write(const Process&, VirtualAddress) const;
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