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Re: Constant Stack Canaries

From Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups comp.arch
Subject Re: Constant Stack Canaries
Date 2025-04-01 22:55 -0400
Organization A noiseless patient Spider
Message-ID <jwv4iz75l6k.fsf-monnier+comp.arch@gnu.org> (permalink)
References (5 earlier) <e05e9d429f71944bbfe74c3f54b79a03@www.novabbs.org> <vseojq$112f7$1@dont-email.me> <62b5c4a25d917c5bab64a815189de826@www.novabbs.org> <vshf6a$3smcv$1@dont-email.me> <21397906a7a77c2d43191fdaab98a3c9@www.novabbs.org>

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>> Say, if you load a single copy of a binary at 0x24680000.
>> Process A and B can't use the same mapping in the same address space,
>> with PC-rel globals, as then they would each see the other's globals.
>
> Say I load a copy of the binary text at 0x24680000 and its data at
> 0x35900000 for a distance of 0x11280000 into the address space of
> a process.
>
> Then I load another copy at 0x44680000 and its data at 55900000
> into the address space of a different process.

But then if thread A (whose state is stored at 0x35900000) sends to
thread B (whose state is at 55900000) a closure whose code points
somewhere inside 0x24680000, it will end up using the state of thread
A instead of the state of the current thread.


        Stefan

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Thread

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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