Constant Stack Canaries

From	Robert Finch <robfi680@gmail.com>
Newsgroups	comp.arch
Subject	Constant Stack Canaries
Date	2025-03-30 08:16 -0400
Organization	A noiseless patient Spider
Message-ID	<vsbcnl$1d4m5$1@dont-email.me> (permalink)

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Just got to thinking about stack canaries. I was going to have a special 
purpose register holding the canary value for testing while the program 
was running. But I just realized today that it may not be needed. Canary 
values could be handled by the program loader as constants, eliminating 
the need for a register. Since the value is not changing while the 
program is running, it could easily be a constant. This may require a 
fixup record handled by the assembler / linker to indicate to the loader 
to place a canary value.

Prolog code would just store an immediate to the stack. On return a TRAP 
instruction could check for the immediate value and trap if not present.
But the process seems to require assembler / linker support.

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Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-03-30 08:16 -0400
  Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-03-30 12:47 -0500
    Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-03-30 20:14 +0000
      Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-03-30 21:26 -0400
      Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-03-31 01:34 -0500
      Re: Constant Stack Canaries Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-03-31 09:04 -0700
        Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-03-31 12:17 -0500
          Re: Constant Stack Canaries Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-03-31 10:57 -0700
          Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-03-31 18:07 +0000
            Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-03-31 13:56 -0500
              Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-03-31 20:52 +0000
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-01 00:58 -0400
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-01 18:51 +0000
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-01 18:06 -0400
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-01 23:24 +0000
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-01 20:07 -0400
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-02 01:47 +0000
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-04 21:07 +0000
                Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-04-01 16:21 -0500
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-01 18:19 -0400
                Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-04-01 23:04 -0500
                Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-04-01 14:34 -0500
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-01 23:21 +0000
                Re: Constant Stack Canaries Stefan Monnier <monnier@iro.umontreal.ca> - 2025-04-01 22:55 -0400
                Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-04-01 23:19 -0500
                Re: Constant Stack Canaries Stefan Monnier <monnier@iro.umontreal.ca> - 2025-04-03 10:09 -0400
                Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-04-03 12:22 -0500
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-03 23:49 -0400
                Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-04-04 12:41 -0500
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-04 21:13 +0000
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-04 23:45 -0400
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-05 16:37 +0000
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-05 18:31 +0000
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-05 17:57 -0400
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-05 23:11 +0000
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-06 14:21 +0000
                Re: Constant Stack Canaries Robert Finch <robfi680@gmail.com> - 2025-04-06 15:01 -0400
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-07 14:04 +0000
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-05 23:06 +0000
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-06 14:32 +0000
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-07 00:51 +0000
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-07 14:09 +0000
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-09 00:23 +0000
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-15 00:43 +0000
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-15 14:02 +0000
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-15 20:46 +0000
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-16 14:07 +0000
                Re: Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-16 21:13 +0000
                Virtualization layers (was: Constant Stack Canaries) Stefan Monnier <monnier@iro.umontreal.ca> - 2025-04-16 17:48 -0400
                Re: Virtualization layers mitchalsup@aol.com (MitchAlsup1) - 2025-04-16 22:12 +0000
                Re: Virtualization layers (was: Constant Stack Canaries) scott@slp53.sl.home (Scott Lurndal) - 2025-04-17 00:49 +0000
                Re: Constant Stack Canaries Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-04-16 15:26 -0700
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-17 00:57 +0000
                Re: virtualization, Constant Stack Canaries John Levine <johnl@taugh.com> - 2025-04-17 01:04 +0000
                Re: virtualization, Constant Stack Canaries Stefan Monnier <monnier@iro.umontreal.ca> - 2025-04-16 21:07 -0400
                Re: virtualization, Constant Stack Canaries Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2025-04-16 23:30 -0700
                Re: virtualization, Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-17 13:32 +0000
                Re: virtualization, Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-17 18:22 +0000
                Re: virtualization, Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-17 20:10 +0000
                Re: virtualization, Constant Stack Canaries mitchalsup@aol.com (MitchAlsup1) - 2025-04-17 21:45 +0000
                Re: Constant Stack Canaries scott@slp53.sl.home (Scott Lurndal) - 2025-04-17 00:47 +0000
                Re: Constant Stack Canaries BGB <cr88192@gmail.com> - 2025-04-02 00:43 -0500

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