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* [Bug python/30044] New: Flawed logic when releasing values from all_values buffer
@ 2023-01-24 18:59 ssbssa at sourceware dot org
  2023-01-24 19:00 ` [Bug python/30044] " ssbssa at sourceware dot org
                   ` (15 more replies)
  0 siblings, 16 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 18:59 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

            Bug ID: 30044
           Summary: Flawed logic when releasing values from all_values
                    buffer
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: ssbssa at sourceware dot org
  Target Milestone: ---

The root problem I encountered was because in a to_string function of a python
pretty printer some value was cast to the type it already had, which meant
value_cast() inside valpy_do_cast() simply returned the input value.

This value was also the mark point of scoped_value_mark free_values, and was
released from all_values by value_to_value_object(), which meant the destructor
of free_values cleared all of all_values (since the mark point was missing).

Any or all of the values that were before the mark point were still used after
the pretty printer finished, which lead to my original crash.

I've reduced this to the attached py-pp-cast.c and py-pp-cast-1.py, in gdb I
just did this:

> >\gdb\build64\gdb-git-python3\gdb\gdb.exe -q py-pp-cast.exe
> Reading symbols from py-pp-cast.exe...
> (gdb) source py-pp-cast-1.py
> (gdb) b break_function
> Breakpoint 1 at 0x401603: file C:/src/repos/binutils-gdb.git/gdb/testsuite/gdb.python/py-pp-cast.c, line 22.
> (gdb) r
> Starting program: C:\gdb\build64\gdb-git-python3\gdb\testsuite\outputs\gdb.python\py-pp-cast\py-pp-cast.exe
> 
> Breakpoint 1, break_function () at C:/src/repos/binutils-gdb.git/gdb/testsuite/gdb.python/py-pp-cast.c:22
> 22        return 0;
> (gdb) up
> #1  0x0134162d in main () at C:/src/repos/binutils-gdb.git/gdb/testsuite/gdb.python/py-pp-cast.c:34
> 34        return break_function();
> (gdb) info locals

Then it crashed, detailed crash info is in crash-1.html.

My idea was to simply make sure a new value is create in valpy_do_cast(), so it
will be after the mark point, preventing this problem:

> --- a/gdb/python/py-value.c
> +++ b/gdb/python/py-value.c
> @@ -820,6 +820,9 @@ valpy_do_cast (PyObject *self, PyObject *args, enum exp_opcode op)
>           res_val = value_cast (type, val);
>         }
> 
> +      if (res_val == val)
> +        res_val = value_copy (val);
> +
>        result = value_to_value_object (res_val);
>      }
>    catch (const gdb_exception &except)

But this is really just a local workaround for a global problem.

My next idea was to change value_mark() that it always creates a new dummy
value entry for the mark point, making sure that no one can release this mark
point.
This fixed the original crash, but I came up with even simpler python code that
still crashed, see py-pp-cast-2.py and crash-2.html.
To reproduce in gdb, it's the same commands as before, but sourcing
py-pp-cast-2.py in the beginng instead.

The reason it crashed now was that the value returned by valpy_do_cast() was
before the mark point, released from all_values as before, and once the python
code was finished (when gdbpy_apply_val_pretty_printer() returned), it was
destroyed (since the python object had the last reference).
But since no pretty printing was done, gdb itself tried to access it for normal
printing, which then crashed.

The question for me is why are values released from all_values at all, is this
done to reduce the used memory?

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
@ 2023-01-24 19:00 ` ssbssa at sourceware dot org
  2023-01-24 19:01 ` ssbssa at sourceware dot org
                   ` (14 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 19:00 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #1 from Hannes Domani <ssbssa at sourceware dot org> ---
Created attachment 14614
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14614&action=edit
reproducer C source

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
  2023-01-24 19:00 ` [Bug python/30044] " ssbssa at sourceware dot org
@ 2023-01-24 19:01 ` ssbssa at sourceware dot org
  2023-01-24 19:01 ` ssbssa at sourceware dot org
                   ` (13 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 19:01 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #2 from Hannes Domani <ssbssa at sourceware dot org> ---
Created attachment 14615
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14615&action=edit
reproducer crash 1 python code

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
  2023-01-24 19:00 ` [Bug python/30044] " ssbssa at sourceware dot org
  2023-01-24 19:01 ` ssbssa at sourceware dot org
@ 2023-01-24 19:01 ` ssbssa at sourceware dot org
  2023-01-24 19:02 ` ssbssa at sourceware dot org
                   ` (12 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 19:01 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #3 from Hannes Domani <ssbssa at sourceware dot org> ---
Created attachment 14616
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14616&action=edit
reproducer crash 2 python code

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (2 preceding siblings ...)
  2023-01-24 19:01 ` ssbssa at sourceware dot org
@ 2023-01-24 19:02 ` ssbssa at sourceware dot org
  2023-01-24 19:02 ` ssbssa at sourceware dot org
                   ` (11 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 19:02 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #4 from Hannes Domani <ssbssa at sourceware dot org> ---
Created attachment 14617
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14617&action=edit
crash 1 info

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (3 preceding siblings ...)
  2023-01-24 19:02 ` ssbssa at sourceware dot org
@ 2023-01-24 19:02 ` ssbssa at sourceware dot org
  2023-01-24 19:03 ` ssbssa at sourceware dot org
                   ` (10 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 19:02 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #5 from Hannes Domani <ssbssa at sourceware dot org> ---
Created attachment 14618
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14618&action=edit
crash 2 info

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (4 preceding siblings ...)
  2023-01-24 19:02 ` ssbssa at sourceware dot org
@ 2023-01-24 19:03 ` ssbssa at sourceware dot org
  2023-01-24 19:04 ` ssbssa at sourceware dot org
                   ` (9 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 19:03 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #14615|text/x-modelica             |text/plain
          mime type|                            |

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (5 preceding siblings ...)
  2023-01-24 19:03 ` ssbssa at sourceware dot org
@ 2023-01-24 19:04 ` ssbssa at sourceware dot org
  2023-01-24 19:07 ` tromey at sourceware dot org
                   ` (8 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-24 19:04 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssbssa at sourceware dot org

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (6 preceding siblings ...)
  2023-01-24 19:04 ` ssbssa at sourceware dot org
@ 2023-01-24 19:07 ` tromey at sourceware dot org
  2023-01-30 22:16 ` tromey at sourceware dot org
                   ` (7 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: tromey at sourceware dot org @ 2023-01-24 19:07 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (7 preceding siblings ...)
  2023-01-24 19:07 ` tromey at sourceware dot org
@ 2023-01-30 22:16 ` tromey at sourceware dot org
  2023-01-30 23:22 ` tromey at sourceware dot org
                   ` (6 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: tromey at sourceware dot org @ 2023-01-30 22:16 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #6 from Tom Tromey <tromey at sourceware dot org> ---
I apparently knew about this problem in the relatively recent past:

commit 42331a1ea2a13ce15ec202c5f0fbef3e5171253c
Author: Tom Tromey <tom@tromey.com>
Date:   Fri Mar 13 17:39:52 2020 -0600

    Change extension language pretty-printers to use value API

    This changes the extension language pretty-printers to use the value
    API.

    Note that new functions were needed, for both Guile and Python.
    Currently both languages always wrap values by removing the values
    from the value chain.  This makes sense to avoid strange behavior with
    watchpoints, and to avoid excessive memory use.  However, when
    printing, it's important to leave the passed-in value untouched, in
    case pretty-printing does nothing -- that way the caller can still
    access it.


This was part of the val_print removal series.

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (8 preceding siblings ...)
  2023-01-30 22:16 ` tromey at sourceware dot org
@ 2023-01-30 23:22 ` tromey at sourceware dot org
  2023-01-31  1:46 ` tromey at sourceware dot org
                   ` (5 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: tromey at sourceware dot org @ 2023-01-30 23:22 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #7 from Tom Tromey <tromey at sourceware dot org> ---
It seems to me that there are two competing wishes here.

On the one hand, removing values from the chain was done to
avoid memory issues.  Suppose you have a command written in
Python and it does a lot of value-based processing.  Formerly,
nothing ever cleared these values from the chain until the command
returned.  So, you could wind up allocating huge amounts of memory.
See bug #12533

On the other hand, code should not generally care if a value
API returns a new value or not.  This came up for value_cast
but it could be anywhere.

Actually there's also a third issue, which is that the Python
layer can end up freeing values from the chain while they are
still in use.

For item 3 I suspect the best answer is to use value_ref_ptr
everywhere.  That way code will generally have a strong reference
to any value it uses.  This is pretty large.

For items 1 and 2 I wonder if it would work for each Python
Value API to do use scoped_value_mark at the start.  The idea
here is that any new values created would be released from the
chain, but older ones would not be.  In conjunction with this,
value_to_value_object would stop releasing values from the chain.

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (9 preceding siblings ...)
  2023-01-30 23:22 ` tromey at sourceware dot org
@ 2023-01-31  1:46 ` tromey at sourceware dot org
  2023-01-31  2:04 ` tromey at sourceware dot org
                   ` (4 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: tromey at sourceware dot org @ 2023-01-31  1:46 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #8 from Tom Tromey <tromey at sourceware dot org> ---
It looks like this transform was already done in a number of spots,
so I feel maybe this is the right track.

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (10 preceding siblings ...)
  2023-01-31  1:46 ` tromey at sourceware dot org
@ 2023-01-31  2:04 ` tromey at sourceware dot org
  2023-01-31 18:29 ` ssbssa at sourceware dot org
                   ` (3 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: tromey at sourceware dot org @ 2023-01-31  2:04 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #9 from Tom Tromey <tromey at sourceware dot org> ---
Created attachment 14643
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14643&action=edit
patch

I have a patch that seems to fix both of these.
Can you try this?
If it works I'll turn your crasher into a test case.

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (11 preceding siblings ...)
  2023-01-31  2:04 ` tromey at sourceware dot org
@ 2023-01-31 18:29 ` ssbssa at sourceware dot org
  2023-02-11  1:13 ` tromey at sourceware dot org
                   ` (2 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: ssbssa at sourceware dot org @ 2023-01-31 18:29 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #10 from Hannes Domani <ssbssa at sourceware dot org> ---
(In reply to Tom Tromey from comment #9)
> Created attachment 14643 [details]
> patch
> 
> I have a patch that seems to fix both of these.
> Can you try this?
> If it works I'll turn your crasher into a test case.

Yes, with this applied there are no more crashes.

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (12 preceding siblings ...)
  2023-01-31 18:29 ` ssbssa at sourceware dot org
@ 2023-02-11  1:13 ` tromey at sourceware dot org
  2023-02-27 22:56 ` cvs-commit at gcc dot gnu.org
  2023-02-27 22:57 ` tromey at sourceware dot org
  15 siblings, 0 replies; 17+ messages in thread
From: tromey at sourceware dot org @ 2023-02-11  1:13 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #11 from Tom Tromey <tromey at sourceware dot org> ---
https://sourceware.org/pipermail/gdb-patches/2023-February/196921.html

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (13 preceding siblings ...)
  2023-02-11  1:13 ` tromey at sourceware dot org
@ 2023-02-27 22:56 ` cvs-commit at gcc dot gnu.org
  2023-02-27 22:57 ` tromey at sourceware dot org
  15 siblings, 0 replies; 17+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-02-27 22:56 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #12 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f3d3bbbcdd8af6295458eee3b023447c13edabd3

commit f3d3bbbcdd8af6295458eee3b023447c13edabd3
Author: Tom Tromey <tom@tromey.com>
Date:   Wed Feb 8 13:59:36 2023 -0700

    Fix value chain use-after-free

    Hannes filed a bug showing a crash, where a pretty-printer written in
    Python could cause a use-after-free.  He sent a patch, but I thought a
    different approach was needed.

    In a much earlier patch (see bug #12533), we changed the Python code
    to release new values from the value chain when constructing a
    gdb.Value.  The rationale for this is that if you write a command that
    does a lot of computations in a loop, all the values will be kept live
    by the value chain, resulting in gdb using a large amount of memory.

    However, suppose a value is passed to Python from some code in gdb
    that needs to use the value after the call into Python.  In this
    scenario, value_to_value_object will still release the value -- and
    because gdb code doesn't generally keep strong references to values (a
    consequence of the ancient decision to use the value chain to avoid
    memory management), this will result in a use-after-free.

    This scenario can happen, as it turns out, when a value is passed to
    Python for pretty-printing.  Now, normally this route boxes the value
    via value_to_value_object_no_release, avoiding the problematic release
    from the value chain.  However, if you then call Value.cast, the
    underlying value API might return the same value, when is then
    released from the chain.

    This patch fixes the problem by changing how value boxing is done.
    value_to_value_object no longer removes a value from the chain.
    Instead, every spot in gdb that might construct new values uses a
    scoped_value_mark to ensure that the requirements of bug #12533 are
    met.  And, because incoming values aren't ever released from the chain
    (the Value.cast one comes earlier on the chain than the
    scoped_value_mark), the bug can no longer occur.  (Note that many
    spots in the Python layer already take this approach, so not many
    places needed to be touched.)

    In the future I think we should replace the use of raw "value *" with
    value_ref_ptr pretty much everywhere.  This will ensure lifetime
    safety throughout gdb.

    The test case in this patch comes from Hannes' original patch.  I only
    made a trivial ("require") change to it.  However, while this fails
    for him, I can't make it fail on this machine; nevertheless, he tried
    my patch and reported the bug as being fixed.

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30044

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* [Bug python/30044] Flawed logic when releasing values from all_values buffer
  2023-01-24 18:59 [Bug python/30044] New: Flawed logic when releasing values from all_values buffer ssbssa at sourceware dot org
                   ` (14 preceding siblings ...)
  2023-02-27 22:56 ` cvs-commit at gcc dot gnu.org
@ 2023-02-27 22:57 ` tromey at sourceware dot org
  15 siblings, 0 replies; 17+ messages in thread
From: tromey at sourceware dot org @ 2023-02-27 22:57 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|---                         |14.1
             Status|NEW                         |RESOLVED

--- Comment #13 from Tom Tromey <tromey at sourceware dot org> ---
Fixed.

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2023-01-31 18:29 ` ssbssa at sourceware dot org
2023-02-11  1:13 ` tromey at sourceware dot org
2023-02-27 22:56 ` cvs-commit at gcc dot gnu.org
2023-02-27 22:57 ` tromey at sourceware dot org

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