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Message-ID: <1516976647.5438.6.camel@linux.intel.com>
Date: Fri, 26 Jan 2018 14:24:07 +0000
From: Alan Cox <alan@...ux.intel.com>
To: David Laight <David.Laight@...LAB.COM>, 'Andy Lutomirski'
<luto@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>
Cc: the arch/x86 maintainers <x86@...nel.org>, LKML
<linux-kernel@...r.kernel.org>, Greg Kroah-Hartman
<gregkh@...uxfoundation.org>, Jann Horn <jannh@...gle.com>, Samuel Neves
<samuel.c.p.neves@...il.com>, Dan Williams <dan.j.williams@...el.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>, Borislav Petkov
<bp@...en8.de>
Subject: Re: [PATCH] x86/retpoline/entry: Disable the entire SYSCALL64 fast
path with retpolines on
> NetBSD (and the other BSD?) defines a structure for the arguments to
> each syscall.
Goes back to v7 or so but they put the syscall arguments into the uarea
so that no pointers were needed (uarea being a per process mapping at a
fixed address) in order to also reduce pointer dereferencing costs (not
that those matter much on modern processors)
Alan.
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