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Date: Thu, 26 Feb 2009 07:06:21 -0500 (EST)
From: Joe Malicki <jmalicki@metacarta.com>
To: linux-kernel <linux-kernel@vger.kernel.org>
Cc: Kenneth Baker <bakerkj@metacarta.com>, Michael Itz <mitz@metacarta.com>
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Subject: Re: BUG: setuid sometimes doesn't.
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----- "Joe Malicki" <jmalicki@metacarta.com> wrote:

> Very rarely, we experience a setuid program not properly getting
> the euid of its owner.
> 
> Thus far, we have only seen failures for the program being setuid
> root, being run by a non-root user, on a multi-core machine.  Trying
> to
> setuid to a user from root, *or* booting with maxcpus=1 and trying to
> setuid from a non-root user to root, both fail.

Sorry, misstated that.

setuid from nonroot->root, or with maxcpus=1, always seems to work.

Only multiple cores with setuid to root has failed for us.

-Joe Malicki