Re: [Xen-devel] [PATCH 2/10] linux 2.6.18: COMPAT_VDSO

[Jan Beulich]

>Ingo just raised this as an issue for paravirt_ops as well.  I don't
>quite follow what's going on there.   My understanding is that there are
>some old versions of glibc (which were unreleased CVS snapshots shipped
>by some vendors) which don't use the vdso's ELF header, but instead have
>their own canned one which built into the library itself.

Perhaps you meanwhile saw the similar question from Keir regarding this
(and my answer), but in short: plain glibc 2.3.2 (at least) supports AT_SYSINFO
but not AT_SYSINFO_HDR. In this scenario, moving the vDSO around is fine,
but glibc-internal (arguably broken) consistency checks prevent the vDSO from
being accepted when not using COMPAT_VDSO.

Jan
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