linux-kernel - Re: can't change euid 0 to uid != running user

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Date:	Fri, 5 Oct 2007 08:28:50 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Luciano Rocha" <strange@....no-ip.org>,
	linux-kernel@...r.kernel.org
Subject: Re: can't change euid 0 to uid != running user

On 10/5/07, Luciano Rocha <strange@....no-ip.org> wrote:
> I have the following problem:
> $ sudo -u ie -s # or sudo su ie
> unable to change to runas uid: Resource temporarily unavailable
>
> Works:
> $ sudo su, followed by su ie
>
> The first sudo also worked while I had a shell under user ie.
>
> When I exited, it stopped working, but it is now working every time I
> trie it.
>
> dmesg shows:
>
> [82602.729330] kobject_add failed for 504 with -EEXIST, don't try to
>                register things with the same name in the same directory.
> [82602.729365]  [<c04b9195>] kobject_shadow_add+0x16e/0x1a0
> [82602.729383]  [<c04b9480>] kobject_set_name+0x29/0x92
> [82602.729504]  [<c04238ea>] user_kobject_create+0x6a/0x90
> [82602.729520]  [<c0423cce>] alloc_uid+0x18f/0x1d7
> [82602.729530]  [<c0427030>] set_user+0x1c/0x8f
> [82602.729539]  [<c0428b5f>] sys_setresuid+0xd5/0x162
> [82602.729552]  [<c0403e6a>] syscall_call+0x7/0xb
> [82602.729575]  =======================
>
> $ git describe
> v2.6.23-rc9-156-ga95dacb
>
> (Clone of Linus' tree, after rc9, with some patches from
> mingo/linux-2.6-sched-devel.git, and a fix for lguest (didn't link due
> to kasprintf)).

Hmm, it works for me under 2.6.23-rc6, so it's either a difference
between our .configs or a late regression. If you could bisect the
problem (starting with reverting Ingo's sched devel patches and lguest
patches, and trying that), then that would tell us where the issue is.

Ray
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