'Hijacking page fault handler
I have a process PID that access a memory region that it's not allowed to, the CPU creates a trap into the kernel which calls do_page_fault() which will send SIGSEGV to the user process. The user process has a custom signal handler that has some logic and the faulting instruction is resumed. What I want to do is to move this signal handler logic to kernel space and prevent SIGSEGV from being sent. For that could I write a kernel module that hijacks the fault handler for this PID or something? or do I have to add my logic to do_page_fault()? Some guidance would be helpful.
Solution 1:[1]
userfaultfd() could be useful to you. It allows you to handle page faults in usermode.
Sources
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