Bugtraq mailing list archives

Re: non-exec stack

From: Casper.Dik () HOLLAND SUN COM (Casper Dik)
Date: Tue, 9 May 2000 21:28:40 +0200

Hi,

On Mon, May 08, 2000 at 10:06:04AM +0200, Casper Dik wrote:

Here's an overflow exploit that works on a non-exec stack on x86 boxes.
It demonstrates how it is possible to thread together several libc
calls.  I have not seen any other exploits for x86 that have done this..


Non-executable stacks do not work in Solaris/x86.

It is impossible to give page level protection that prevents
execution on the x86 architecture.


Hmmm, so how do they do that on Linux?  I thought Solar Designer had a
non-exec-stack patch for Linux.


Yes, but I don't think you can "mprotect" that stack back page by
page to allow execute permission.

Casper

Current thread:

non-exec stack Tim Newsham (May 06)
- "I don't think I really love you" Michal Zalewski (May 07)
- Re: non-exec stack Casper Dik (May 08)
  - Re: non-exec stack Gert Doering (May 09)
    - Re: non-exec stack Casper Dik (May 09)
    - Re: non-exec stack Nate Eldredge (May 10)
    - 쀼릿: Re: non-exec stac ZhaoQian (May 10)
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(Thread continues...)