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Kernel+LibC+crash: Add mprotect() syscall

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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. :^)
This commit is contained in:
Andreas Kling 2019-08-12 19:33:24 +02:00
parent 4917445e2e
commit 7d6689055f
Notes: sideshowbarker 2024-07-19 12:42:29 +09:00
7 changed files with 36 additions and 1 deletions
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2
Kernel/Syscall.cpp
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@ -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;