Messages in this thread |  | | Subject | Re: Security question: "Text file busy" overwriting executables but | Date | Thu, 4 Oct 2001 21:39:46 +0100 (BST) | From | Alan Cox <> |
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> On Thu, 4 Oct 2001, 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. > > <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>
The MAP_DENYWRITE rule was added a long time ago because people found actual workable DoS attacks - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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