Re: [PATCH] capabilities: Ambient capability set V1

On Mon, 23 Feb 2015, Andy Lutomirski wrote:

On Feb 23, 2015 8:41 AM, "Christoph Lameter" [off-list ref] wrote:

quoted

On Mon, 23 Feb 2015, Andy Lutomirski wrote:

quoted

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.

Really? We have been running these things for years with the approach of
leaving these caps active.