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    SubjectRe: [RFC PATCH v9 01/27] Documentation/x86: Add CET description
    On Mon, Mar 9, 2020 at 1:59 PM Dave Hansen <dave.hansen@intel.com> wrote:
    >
    > On 3/9/20 1:54 PM, H.J. Lu wrote:
    > >> If a program with the magic ELF CET flags missing can’t make a
    > >> thread with IBT and/or SHSTK enabled, then I think we’ve made an
    > >> error and should fix it.
    > >>
    > > A non-CET program can start a CET program and vice versa.
    >
    > Could we be specific here, please?
    >
    > HJ are you saying that:
    > * CET program can execve() a non-CET program, and
    > * a non-CET program can execve() a CET program
    >
    > ?

    Yes.

    > That's obvious.
    >
    > But what are the rules for clone()? Should there be rules for
    > mismatches for CET enabling between threads if a process (not child
    > processes)?

    What did you mean? A threaded application is either CET enabled or not
    CET enabled. A new thread from clone makes no difference.

    --
    H.J.

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