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Kernel: Disallow syscalls from writeable memory

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Processes will now crash with SIGSEGV if they attempt making a syscall
from PROT_WRITE memory.

This neat idea comes from OpenBSD. :^)
This commit is contained in:
Andreas Kling 2019-11-29 16:15:30 +01:00
parent ea52fe528a
commit e56daf547c
5 changed files with 27 additions and 5 deletions
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1
Kernel/VM/MemoryManager.cpp
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@ -289,7 +289,6 @@ Region* MemoryManager::user_region_from_vaddr(Process& process, VirtualAddress v
Region* MemoryManager::region_from_vaddr(Process& process, VirtualAddress vaddr)
{
ASSERT_INTERRUPTS_DISABLED();
if (auto* region = kernel_region_from_vaddr(vaddr))
return region;
return user_region_from_vaddr(process, vaddr);