Date: Wed, 9 Mar 2016 13:19:45 -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 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. --Andy
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