Re: [RFC/PATCH] revoke/frevoke system calls V2

From: Pekka Enberg
Date: Thu Jul 27 2006 - 14:08:31 EST


On Thu, 2006-07-27 at 20:06 +0200, Petr Baudis wrote:
> Make that setuid root or just create log file owned by you and make root
> run it. Should be innocent enough, right?
>
> Well, except that you can revoke the log file before the shadow file is
> opened, at which point open() probably reuses the fd and the program
> conveniently logs to /etc/shadow.

No, the fd is leaked on purpose to avoid recycling. See revoke_fds for
details.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/