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    SubjectRe: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file
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    On Tue, 2019-06-11 at 12:41 +0100, Dave Martin wrote:
    > On Mon, Jun 10, 2019 at 07:24:43PM +0200, Florian Weimer wrote:
    > > * Yu-cheng Yu:
    > >
    > > > To me, looking at PT_GNU_PROPERTY and not trying to support anything is a
    > > > logical choice. And it breaks only a limited set of toolchains.
    > > >
    > > > I will simplify the parser and leave this patch as-is for anyone who wants
    > > > to
    > > > back-port. Are there any objections or concerns?
    > >
    > > Red Hat Enterprise Linux 8 does not use PT_GNU_PROPERTY and is probably
    > > the largest collection of CET-enabled binaries that exists today.
    >
    > For clarity, RHEL is actively parsing these properties today?
    >
    > > My hope was that we would backport the upstream kernel patches for CET,
    > > port the glibc dynamic loader to the new kernel interface, and be ready
    > > to run with CET enabled in principle (except that porting userspace
    > > libraries such as OpenSSL has not really started upstream, so many
    > > processes where CET is particularly desirable will still run without
    > > it).
    > >
    > > I'm not sure if it is a good idea to port the legacy support if it's not
    > > part of the mainline kernel because it comes awfully close to creating
    > > our own private ABI.
    >
    > I guess we can aim to factor things so that PT_NOTE scanning is
    > available as a fallback on arches for which the absence of
    > PT_GNU_PROPERTY is not authoritative.

    We can probably check PT_GNU_PROPERTY first, and fallback (based on ld-linux
    version?) to PT_NOTE scanning?

    Yu-cheng

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