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

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Message-ID: <CALCETrVMp6twHwdTrX3WAzEL+7qi1Aha5BxVz++V_Yc2AP8pBg@mail.gmail.com>
Date:	Sat, 12 Mar 2016 10:13:39 -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 Wed, Mar 9, 2016 at 1:19 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Wed, Mar 9, 2016 at 9:58 AM, Andy Lutomirski <luto@...capital.net> wrote:
>> 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.
>
> This version should be okay:
>
> https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vdso&id=fed6d35d3941bc53896ab80b5c8d68d54cc00347
>
> You'll need the parent, too, if you want to test.  I'm going to give
> the 0day bot a good long chew, since the parent change is a little bit
> scary.

Nope, that version was also not okay.  But the version currently in
that branch has survived the kbuild bot for a while now.

Yikes our build process for usermode code sucks.

--Andy