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    SubjectRe: [PATCH v11 25/25] x86/cet/shstk: Add arch_prctl functions for shadow stack
    On Thu, Aug 27, 2020 at 6:19 AM Florian Weimer <fweimer@redhat.com> wrote:
    >
    > * Dave Martin:
    >
    > > You're right that this has implications: for i386, libc probably pulls
    > > more arguments off the stack than are really there in some situations.
    > > This isn't a new problem though. There are already generic prctls with
    > > fewer than 4 args that are used on x86.
    >
    > As originally posted, glibc prctl would have to know that it has to pull
    > an u64 argument off the argument list for ARCH_X86_CET_DISABLE. But
    > then the u64 argument is a problem for arch_prctl as well.
    >

    Argument of ARCH_X86_CET_DISABLE is int and passed in register.

    --
    H.J.

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