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Date: Fri, 25 Sep 2009 11:23:47 +0300
Message-ID: <cc557aab0909250123k361f438fk3efd13753fcbd434@mail.gmail.com>
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: "Kirill A. Shutemov" <kirill@shutemov.name>, 
	ALT Linux Team development discussions <devel@lists.altlinux.org>,
	"Dmitry V. Levin" <ldv@altlinux.org>, 
	"Konstantin A. Lepikhov" <lakostis@unsafe.ru>,
	Michail Yakushin <silicium@altlinux.org>
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Subject: Re: [devel] suid binaries and ELF Auxiliary Vectors
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On Fri, Sep 25, 2009 at 11:15 AM, Kirill A. Shutemov
<kirill@shutemov.name> wrote:
> 2009/9/25 Konstantin A. Lepikhov <lakostis@unsafe.ru>:
>> http://people.redhat.com/drepper/elftut1.ps -
>
> Thanks for link.
>
>> "The function create_elf_tables is responsible for
>> creating the user stack which includes creating the auxiliary vector."
>
> Yep, I see. It really creates auxv on suid binaries. At least it reaches
> copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))
> But still there is no auxv in userspace. :(
>

It seems problem is in glibc. When I compiled similar code with
klibc, it works fine.

Dmitry, could you comment it? Probably, it's security-related
thing. What's the point?