Re: [x86, vdso] BUG: unable to handle kernel paging request at d34bd000

[Andy Lutomirski]

On Sun, Mar 9, 2014 at 8:18 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> (Of course, I haven't the faintest idea what l_addr in glibc means.
> If there was a way to arrange for l_addr to be zero, then maybe none
> of this would matter.  Hmm, I wonder if just not relocating the vdso
> at all would have the desired effect.  Anyone out there understand
> glibc?)

No, that won't work.  The bug is that glibc expects PT_DYNAMIC's vaddr
to be the virtual address of the dynamic table.  This can only be true
if the vdso is mapped at the address that the kernel relocated it to.

I also learned that glibc's code is really hideous.  Wow.

--Andy
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