linux-kernel - Re: [RFC PATCH] x86/vdso/32: Add AT

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Message-ID: <CALCETrWNSAWHhQmxuJr1eF+3nLkd50NGF3pQ2EiNvzLFKybegQ@mail.gmail.com>
Date:	Wed, 9 Mar 2016 09:58:16 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	"musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers

On Tue, Mar 8, 2016 at 5:24 PM, Andy Lutomirski <luto@...nel.org> wrote:
> musl implements system call cancellation in an unusual but clever way.
> When a thread issues a cancellable syscall, musl issues the syscall
> through a special thunk that looks roughly like this:
>

FWIW, this patch fails disastrously on 64-bit kernels.  I fixed it,
but it needs kbuild changes.  I'll send those out to the maintainers.

--Andy