Re: [PATCH v3] fs: introduce pipe-only dump mode suid_dumpable=3

[Andrew Morton]

On Fri, 22 Jun 2012 14:51:54 -0700
Kees Cook <keescook@xxxxxxxxxxxx> wrote:

> > And how serious is the security vulnerability, in real-world terms?
> > Serious enough to risk this amount of bustage?
> 
> If they're running in mode "2" and they do not have a coredump pipe
> handler defined, local users can gain root access.

But the kernel can detect this case and avoid it?  If we do that at the same
time, we can avoid any mode=2 non-back-compatible breakage?
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