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

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

On Fri, 22 Jun 2012 15:07:45 -0700
Kees Cook <keescook@xxxxxxxxxxxx> wrote:

> mode=2 to disk _should_ break, is my point.

And my point is that we should at least tell people that we broke it. 
I don't believe that returning an EINVAL from the write() is
sufficient.  Because it introduces a high risk that people will run
misconfigured systems for lengthy periods and it will cause them to
have to do a *lot* of work once they discover that their system is
misbehaving.

So if we really really must instabreak back-compatibility, we should
shout loudly into syslog about it: tell people that their system is
broken and tell them what to do about it.

And we should explain and justify this extraordinary action in the
patch changelog.
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