[RFC v14-rc][PATCH 07/23] Restore memory address space
orenl at cs.columbia.edu
Sun Mar 22 14:51:50 PDT 2009
Serge E. Hallyn wrote:
> Quoting Oren Laadan (orenl at cs.columbia.edu):
>> + ret = -EINVAL;
>> + if (hh->vdso != (unsigned long) mm->context.vdso)
>> + goto out;
> We were just talking about vdso+s390 on irc this morning,
> wondering about how to handle it...
> Looking at arch/x86/vdso/vma.c, this seems like it should
> pretty much always error out. The vdso base is set as a
> random offset above the stack base at exec().
Yes, I was wondering too ... :(
The default config is CONFIG_COMPAT_VDSO which disabled the
randomization, that's why it works for the default case on X86_32.
I think the code is mainly in arch/x86/vdso/vdso32_setup.c.
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