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monocasa
on Oct 27, 2023
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OpenBSD: Removing syscall(2) from libc and kernel
I don't think that helps much. OpenBSD already only allows syscalls originating out of the libc .text section, so whether the trap itself comes from a syscall instruction or some other trap mechanism doesn't really improve security AFAICT.
saagarjha
on Oct 27, 2023
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Yeah but it sounds super cool doesn’t it!
monocasa
on Oct 27, 2023
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Every time I've seen a dev team go down that road, it's come with rather unfortunate unintended side effects.
https://devblogs.microsoft.com/oldnewthing/20041215-00/?p=37...
saagarjha
on Oct 28, 2023
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Yeah but think of the attacks I thought of in the shower that it mitigates
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