linux-security-module November 2007 archive
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linux-security-module: Re: [PATCH] 64bit capability support (leg

Re: [PATCH] 64bit capability support (legacy support fix)

From: Serge E. Hallyn <serue_at_nospam>
Date: Wed Nov 21 2007 - 17:10:51 GMT
To: Andrew Morton <>

Quoting Andrew Morton (
> On Sat, 17 Nov 2007 21:25:27 -0800 Andrew Morgan <> wrote:
> > The attached patch (171282b3553fcec43b9ab615eb7daf6c2b494a87) applies
> > against 2.6.24-rc2-mm1. It addresses the problem reported by Kevin and
> > Andy - ultimately, the legacy support wasn't transparent. In particular,
> > userspace 32-bit capability manipulations (when run by root) that used
> > to work, without this patch, fail.
> My venerable FC1 machine says
> warning: process `zsh' gets w/ old libcap
> warning: process `zsh' gets w/ old libcap
> warning: process `zsh' gets w/ old libcap
> should I be scared?

It should be safe as of Andrew's latest patch. (Before that patch it was only unsafe because root's capabilities are just set to {~0,~0} so they include invalid capabilities.

Agreed a better error message would be good. Would it be inappropriate to include the URL for new libcap versions?

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