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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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6
Kernel/Syscall.cpp
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@@ -189,6 +189,12 @@ void syscall_handler(TrapFrame* trap)
ASSERT_NOT_REACHED();
}
if (process.enforces_syscall_regions() && !calling_region->is_syscall_region()) {
dbgln("Syscall from non-syscall region");
handle_crash(regs, "Syscall from non-syscall region", SIGSEGV);
ASSERT_NOT_REACHED();
}
process.big_lock().lock();
u32 function = regs.eax;
u32 arg1 = regs.edx;