Kernel+LibC+crash: Add mprotect() syscall

This patch adds the mprotect() syscall to allow changing the protection
flags for memory regions. We don't do any region splitting/merging yet,
so this only works on whole mmap() regions.

Added a "crash -r" flag to verify that we crash when you attempt to
write to read-only memory. :^)

1 files changed, 2 insertions, 0 deletions

diff --git a/Kernel/Syscall.cpp b/Kernel/Syscall.cpp
index 48b9313a92..8d43d8a56c 100644
--- a/Kernel/Syscall.cpp
+++ b/Kernel/Syscall.cpp
@@ -305,6 +305,8 @@ static u32 handle(RegisterDump& regs, u32 function, u32 arg1, u32 arg2, u32 arg3
         return current->process().sys$share_buffer_globally((int)arg1);
     case Syscall::SC_set_process_icon:
         return current->process().sys$set_process_icon((int)arg1);
+    case Syscall::SC_mprotect:
+        return current->process().sys$mprotect((void*)arg1, (size_t)arg2, (int)arg3);
     default:
         kprintf("<%u> int0x82: Unknown function %u requested {%x, %x, %x}\n", current->process().pid(), function, arg1, arg2, arg3);
         return -ENOSYS;