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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
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