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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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Kernel/Syscalls/fork.cpp
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@ -47,6 +47,7 @@ pid_t Process::sys$fork(RegisterState& regs)
child->m_has_execpromises = m_has_execpromises;
child->m_veil_state = m_veil_state;
child->m_unveiled_paths = m_unveiled_paths.deep_copy();
child->m_enforces_syscall_regions = m_enforces_syscall_regions;
child->m_fds = m_fds;
child->m_sid = m_sid;
child->m_pg = m_pg;