From: Matthew Wilcox <willy@infradead.org>
To: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
Amir Goldstein <amir73il@gmail.com>,
linux-mm@kvack.org, "H . Peter Anvin" <hpa@zytor.com>,
tautschn@amazon.co.uk, Ingo Molnar <mingo@kernel.org>,
linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
Andi Kleen <ak@linux.intel.com>,
user-mode-linux-devel@lists.sourceforge.net, x86@kernel.org,
hmclauchlan@fb.com, Christoph Hellwig <hch@infradead.org>,
Jiri Slaby <jslaby@suse.com>, Darren Hart <dvhart@infradead.org>,
Jaswinder Singh <jaswinder@infradead.org>,
arnd@arndb.de, Jeff Dike <jdike@addtoit.com>,
viro@ZenIV.linux.org.uk, Thomas Gleixner <tglx@linutronix.de>,
netdev@vger.kernel.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org,
"Luis R . Rodriguez" <mcgrof@kernel.org>,
"Eric W . Biederman" <ebiederm@xmission.com>,
linux-fsdevel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
torvalds@linux-foundation.org,
"David S . Miller" <davem@davemloft.net>
Subject: Re: [PATCH 000/109] remove in-kernel calls to syscalls
Date: Thu, 29 Mar 2018 07:20:27 -0700 [thread overview]
Message-ID: <20180329142027.GA24860@bombadil.infradead.org> (raw)
In-Reply-To: <20180329112426.23043-1-linux@dominikbrodowski.net>
On Thu, Mar 29, 2018 at 01:22:37PM +0200, Dominik Brodowski wrote:
> At least on 64-bit x86, it will likely be a hard requirement from v4.17
> onwards to not call system call functions in the kernel: It is better to
> use use a different calling convention for system calls there, where
> struct pt_regs is decoded on-the-fly in a syscall wrapper which then hands
> processing over to the actual syscall function. This means that only those
> parameters which are actually needed for a specific syscall are passed on
> during syscall entry, instead of filling in six CPU registers with random
> user space content all the time (which may cause serious trouble down the
> call chain).[*]
How do we stop new ones from springing up? Some kind of linker trick
like was used to, er, "dissuade" people from using gets()?
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next prev parent reply other threads:[~2018-03-29 14:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-29 11:22 [PATCH 000/109] remove in-kernel calls to syscalls Dominik Brodowski
2018-03-29 11:22 ` [PATCH 004/109] kexec: call do_kexec_load() in compat syscall directly Dominik Brodowski
2018-03-29 11:24 ` [PATCH 102/109] kexec: move sys_kexec_load() prototype to syscalls.h Dominik Brodowski
2018-03-29 14:20 ` Matthew Wilcox [this message]
2018-03-29 14:42 ` [PATCH 000/109] remove in-kernel calls to syscalls Dominik Brodowski
2018-03-29 14:46 ` David Laight
2018-03-29 14:55 ` Dominik Brodowski
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