--27511946-1519860860-932552532=:9430
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Tue, 20 Jul 1999, Pavel Machek wrote:
> > The syscall essentially exposes current->dumpable to userland. NAMES
> > FOR THE SYSCALL ON A POSTCARD PLEASE.
> >
> > Why would you want do do this?
> >
> > Well, in userland, we are having to do a lot of second guessing of
> > current->dumpable. If dumpable is FALSE, we need to restrict several
> > things in the dynamic linker, and libc, for security reasons.
>
> Yes, please. This was one of major reasons elfcap patch became a bit
> ugly. We'll need that few months before we can put capabilities into
> mainstream use.
Attached is a patch which does a little more than what
was suggested. It:
* splits dumpable into three flags which separately protect against
signals and ptrace and restrict core dumps.
* exposes this to userspace via prctl(2) - a process can query its
protection level, and also increase it.
This has potentially serious security implications, and there could
well be cases that I've missed, or reasons why this is just a dangerous
idea.
Comments?
Matthew.
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