Re: Security question: "Text file busy" overwriting executables but not shared libraries?

Linus Torvalds
2001-10-04T05:49:49Z

On Thu, 4 Oct 2001, Alexander Viro wrote:
> <nit>
> I _really_ doubt that something does write() on /etc/passwd. Create a
> file and rename it over the thing - sure, but that's it.
> </nit>

Well, yeah, bad choice. Can you believe /var/run/utmp or similar?

And yes, we could add checks for the thing being executable before we
accept MAP_DENYWRITE instead of just ignoring the flag from user space.
Nobody has cared enough to make the effort.

Until now?

Linus