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

From: John Levon (moz@compsoc.man.ac.uk)
Date: Thu Oct 04 2001 - 07:54:12 EST

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On Thu, Oct 04, 2001 at 05:38:12AM +0000, Linus Torvalds wrote:

> The reason the kernel refuses to honour it, is that MAP_DENYWRITE is an
> excellent DoS-vehicle - you just mmap("/etc/passwd") with MAP_DENYWRITE,
> and even root cannot write to it.. Vary nasty.

why is MAP_EXECUTABLE dealt with in the same way then ?

john

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