On Mon, 2007-11-19 at 14:06 -0800, Roland McGrath wrote:
> This makes x86_64's ia32 emulation support share the sources used in the
> 32-bit kernel for the 32-bit vDSO and much of its setup code.
>
> The 32-bit vDSO mapping now behaves the same on x86_64 as on native 32-bit.
> The abi.syscall32 sysctl on x86_64 now takes the same values that
> vm.vdso_enabled takes on the 32-bit kernel. That is, 1 means a randomized
> vDSO location, 2 means the fixed old address. The CONFIG_COMPAT_VDSO
> option is now available to make this the default setting, the same meaning
> it has for the 32-bit kernel. (This does not affect the 64-bit vDSO.)
I think you should drop CONFIG_COMPAT_VDSO support for 32-bit VDSO on
64-bit kernel. This was only to hack around a broken version of glibc
that shipped with SUSE PRO 9.0, which had broken assertions based on
misinterpretation of ELF fields. 64-bit machines will never see this
glibc and the hack can die.
Perhaps it is finally time to remove the hack from 32-bit as well, and
eliminate COMPAT_VDSO entirely? Or does it really have to live forever.
Zach
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