Messages in this thread | | | From | Linus Torvalds <> | Date | Tue, 23 Aug 2011 14:20:20 -0700 | Subject | Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) |
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On Tue, Aug 23, 2011 at 2:08 PM, H. Peter Anvin <hpa@zytor.com> wrote: > > Again, can we steal one of the padding fields to use for that state > variable? We have two 16-bit padding fields; one for cs and one for ss.
We can steal them for passing the information to the user, but no, I don't think we can use them to then take the information *from* the user.
Somebody may well be setting up a 'pt_regs' structure on his own, and simply not fill in the padding, resulting in random data in those fields.
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