Messages in this thread | | | Date | Mon, 05 Jan 2015 13:18:27 -0800 | From | Dave Hansen <> | Subject | Re: [PATCH 3.19 3/3] x86, mpx: Change the MPX enable/disable API to arch_prctl |
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On 01/05/2015 12:42 PM, Andi Kleen wrote: > Dave Hansen <dave.hansen@linux.intel.com> writes: >> On 12/29/2014 04:52 PM, Andy Lutomirski wrote: >>> This has the benefit the it avoids cluttering prctl with more >>> arch-specific functionality. The down side is that arch_prctl will >>> need to be wired up as a 32-bit syscall to add 32-bit support for >>> MPX. >> >> There is existing userspace out there which depends on the existing >> prctl() setup. There isn't a _lot_ and it might still be able to be >> changed easily, but this isn't a given. >> >> I'll check in with the folks doing the gcc (runtime) part of this next >> week and see what they think. > > It'll be quite messy for 32bit because they would need to use syscall(), > as glibc won't have a arch_prctl stub.
Yeah, I'd _really_ prefer not to change it. The code is in a gcc branch, but is getting pulled in to the 5.0 release. We've got *absolutely* no shortage of prctl numbers.
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