Re: [PATCH] capabilities: Ambient capability set V1

From: Andy Lutomirski
Date: Mon Feb 23 2015 - 18:52:02 EST

On Feb 23, 2015 8:41 AM, "Christoph Lameter" <cl@xxxxxxxxx> wrote:
> On Mon, 23 Feb 2015, Andy Lutomirski wrote:
> > If you set ambient caps and then run a setuid program (without
> > no_new_privs), then the ambient set *must* be cleared by the kernel
> > because that's what the setuid program expects. Yes, the whole
> Why would a setuid program expect that? I'd say we expect the ambient set
> to remain in effect. What would break if the ambient set would stay
> active?

On a total guess: exim, sendmail, sudo, Apache suexec, etc. Basically
anything that expects setresuid(nonzero values); execve to drop caps.

I haven't checked how many of the examples above actually do this.

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