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Kernel: Add a way to specify which memory regions can make syscalls

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This patch adds sys$msyscall() which is loosely based on an OpenBSD
mechanism for preventing syscalls from non-blessed memory regions.

It works similarly to pledge and unveil, you can call it as many
times as you like, and when you're finished, you call it with a null
pointer and it will stop accepting new regions from then on.

If a syscall later happens and doesn't originate from one of the
previously blessed regions, the kernel will simply crash the process.
This commit is contained in:
Andreas Kling 2021-02-02 19:56:11 +01:00
parent d57b4128a1
commit 823186031d
10 changed files with 43 additions and 1 deletions
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2
Kernel/Syscalls/execve.cpp
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@ -549,6 +549,8 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
m_execpromises = 0;
m_has_execpromises = false;
m_enforces_syscall_regions = false;
m_veil_state = VeilState::None;
m_unveiled_paths.clear();