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

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Message-ID: <20071005192931.GB12135@bit.office.eurotux.com>
Date:	Fri, 5 Oct 2007 20:29:31 +0100
From:	Luciano Rocha <strange@....no-ip.org>
To:	Ray Lee <ray-lk@...rabbit.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: can't change euid 0 to uid != running user

On Fri, Oct 05, 2007 at 08:28:50AM -0700, Ray Lee wrote:
> 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.

I'll try a clean Linus' tree tomorrow and see if I can reproduce the
problem.

-- 
lfr
0/0

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