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* [Bug gdb/26901] New: Python array subscript fails with flexible array member without size
@ 2020-11-15  2:47 simark at simark dot ca
  2020-11-15  2:50 ` [Bug gdb/26901] Array " simark at simark dot ca
                   ` (18 more replies)
  0 siblings, 19 replies; 20+ messages in thread
From: simark at simark dot ca @ 2020-11-15  2:47 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

            Bug ID: 26901
           Summary: Python array subscript fails with flexible array
                    member without size
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simark at simark dot ca
  Target Milestone: ---

Consider this program:

---
#include <stdlib.h>

struct vectorinox
{
  int size;
  int data[];
};

int main (void)
{
    /* Make a vector of three elements.  */
    struct vectorinox *vector = malloc (sizeof (struct vectorinox) +
sizeof(int) * 3);
    vector->size = 3;
    vector->data[0] = 11;
    vector->data[1] = 22;
    vector->data[2] = 33;

    return 0;
}
---

Trying to access an element of the `data` array in Python yields:

>>> vec = gdb.parse_and_eval('vector')
>>> data = vec['data']
>>> print(data[0])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
gdb.MemoryError: Cannot access memory at address 0x5535555592a0

And with GDB 9.2:

>>> vec = gdb.parse_and_eval('vector')
>>> data = vec['data']
>>> print(data[0])
11

This failure was introduced by commit 7c6f27129631 ("gdb: make
get_discrete_bounds check for non-constant range bounds").  Unfortunately, this
commit doesn't build, but it's trivial to fix if you want to try it: just
remove the parenthesis after `kind` that it introduces.

val_subscript passes the array's index type (of type code TYPE_CODE_RANGE) to
get_discrete_bounds.  The index type has the low bound set to constant 0 and
the high bound unknown.  Before the commit, get_discrete_bounds would return
"success" and set the low and high bound to 0.  Although it's a bit by chance
that it returned 0 for the high bound, since the bound was "unknown".  It
doesn't really matter in that case because the high bound doesn't get used by
the caller.

After the commit, the new check in get_discrete_bounds sees that the high bound
isn't a constant, so returns "failure".  However, val_subscript doesn't check
the return value, and uses the uninitialized values of low and high bounds, and
it goes downhill from there.

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
@ 2020-11-15  2:50 ` simark at simark dot ca
  2020-11-15  2:50 ` simark at simark dot ca
                   ` (17 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: simark at simark dot ca @ 2020-11-15  2:50 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Python array subscript      |Array subscript fails with
                   |fails with flexible array   |flexible array member
                   |member without size         |without size

--- Comment #1 from Simon Marchi <simark at simark dot ca> ---
Actually, it doesn't to be from Python, as value_subscript is used by
everything.  It fails on the command line too:

(gdb) p vector.data [1]
Cannot access memory at address 0x5545555592a4

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
  2020-11-15  2:50 ` [Bug gdb/26901] Array " simark at simark dot ca
@ 2020-11-15  2:50 ` simark at simark dot ca
  2020-11-16 18:21 ` simark at simark dot ca
                   ` (16 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: simark at simark dot ca @ 2020-11-15  2:50 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|HEAD                        |10.1

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
  2020-11-15  2:50 ` [Bug gdb/26901] Array " simark at simark dot ca
  2020-11-15  2:50 ` simark at simark dot ca
@ 2020-11-16 18:21 ` simark at simark dot ca
  2020-12-03 19:01 ` simark at simark dot ca
                   ` (15 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: simark at simark dot ca @ 2020-11-16 18:21 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |10.2

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (2 preceding siblings ...)
  2020-11-16 18:21 ` simark at simark dot ca
@ 2020-12-03 19:01 ` simark at simark dot ca
  2020-12-09 18:53 ` cvs-commit at gcc dot gnu.org
                   ` (14 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: simark at simark dot ca @ 2020-12-03 19:01 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

--- Comment #2 from Simon Marchi <simark at simark dot ca> ---
Proposed patch here:
https://sourceware.org/pipermail/gdb-patches/2020-November/173496.html

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (3 preceding siblings ...)
  2020-12-03 19:01 ` simark at simark dot ca
@ 2020-12-09 18:53 ` cvs-commit at gcc dot gnu.org
  2020-12-09 21:34 ` cvs-commit at gcc dot gnu.org
                   ` (13 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-12-09 18:53 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Simon Marchi <simark@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5b56203a7cadd545b33713e98e274e582242e090

commit 5b56203a7cadd545b33713e98e274e582242e090
Author: Simon Marchi <simon.marchi@efficios.com>
Date:   Wed Dec 9 13:52:12 2020 -0500

    gdb: fix value_subscript when array upper bound is not known

    Since commit 7c6f27129631 ("gdb: make get_discrete_bounds check for
    non-constant range bounds"), subscripting  flexible array member fails:

        struct no_size
        {
          int n;
          int items[];
        };

        (gdb) p *ns
        $1 = {n = 3, items = 0x5555555592a4}
        (gdb) p ns->items[0]
        Cannot access memory at address 0xfffe555b733a0164
        (gdb) p *((int *) 0x5555555592a4)
        $2 = 101  <--- we would expect that
        (gdb) p &ns->items[0]
        $3 = (int *) 0xfffe5559ee829a24  <--- wrong address

    Since the flexible array member (items) has an unspecified size, the array
type
    created for it in the DWARF doesn't have dimensions (this is with gcc
9.3.0,
    Ubuntu 20.04):

        0x000000a4:   DW_TAG_array_type
                        DW_AT_type [DW_FORM_ref4]       (0x00000038 "int")
                        DW_AT_sibling [DW_FORM_ref4]    (0x000000b3)

        0x000000ad:     DW_TAG_subrange_type
                          DW_AT_type [DW_FORM_ref4]     (0x00000031 "long
unsigned int")

    This causes GDB to create a range type (TYPE_CODE_RANGE) with a defined
    constant low bound (dynamic_prop with kind PROP_CONST) and an undefined
    high bound (dynamic_prop with kind PROP_UNDEFINED).

    value_subscript gets both bounds of that range using
    get_discrete_bounds.  Before commit 7c6f27129631, get_discrete_bounds
    didn't check the kind of the dynamic_props and would just blindly read
    them as if they were PROP_CONST.  It would return 0 for the high bound,
    because we zero-initialize the range_bounds structure.  And it didn't
    really matter in this case, because the returned high bound wasn't used
    in the end.

    Commit 7c6f27129631 changed get_discrete_bounds to return a failure if
    either the low or high bound is not a constant, to make sure we don't
    read a dynamic prop that isn't a PROP_CONST as a PROP_CONST.  This
    change made get_discrete_bounds start to return a failure for that
    range, and as a result would not set *lowp and *highp.  And since
    value_subscript doesn't check get_discrete_bounds' return value, it just
    carries on an uses an uninitialized value for the low bound.  If
    value_subscript did check the return value of get_discrete_bounds, we
    would get an error message instead of a bogus value.  But it would still
    be a bug, as we wouldn't be able to print the flexible array member's
    elements.

    Looking at value_subscript, we see that the low bound is always needed,
    but the high bound is only needed if !c_style.  So, change
    value_subscript to use get_discrete_low_bound and
    get_discrete_high_bound separately.  This fixes the case described
    above, where the low bound is known but the high bound isn't (and is not
    needed).  This restores the original behavior without accessing a
    dynamic_prop in a wrong way.

    A test is added.  In addition to the case described above, a case with
    an array member of size 0 is added, which is a GNU C extension that
    existed before flexible array members were introduced.  That case
    currently fails when compiled with gcc <= 8.  gcc <= 8 produces DWARF
    similar to the one shown above, while gcc 9 adds a DW_AT_count of 0 in
    there, which makes the high bound known.  A case where an array member
    of size 0 is the only member of the struct is also added, as that was
    how PR 28675 was originally reported, and it's an interesting corner
    case that I think could trigger other funny bugs.

    Question about the implementation: in value_subscript, I made it such
    that if the low or high bound is unknown, we fall back to zero.  That
    effectively makes it the same as it was before 7c6f27129631.  But should
    we instead error() out?

    gdb/ChangeLog:

            PR 26875, PR 26901
            * gdbtypes.c (get_discrete_low_bound): Make non-static.
            (get_discrete_high_bound): Make non-static.
            * gdbtypes.h (get_discrete_low_bound): New declaration.
            (get_discrete_high_bound): New declaration.
            * valarith.c (value_subscript): Only fetch high bound if
            necessary.

    gdb/testsuite/ChangeLog:

            PR 26875, PR 26901
            * gdb.base/flexible-array-member.c: New test.
            * gdb.base/flexible-array-member.exp: New test.

    Change-Id: I832056f80e6c56f621f398b4780d55a3a1e299d7

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (4 preceding siblings ...)
  2020-12-09 18:53 ` cvs-commit at gcc dot gnu.org
@ 2020-12-09 21:34 ` cvs-commit at gcc dot gnu.org
  2020-12-09 22:11 ` simark at simark dot ca
                   ` (12 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-12-09 21:34 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The gdb-10-branch branch has been updated by Simon Marchi
<simark@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=138084b24811c191a85c919116d839a8bd89d57c

commit 138084b24811c191a85c919116d839a8bd89d57c
Author: Simon Marchi <simon.marchi@efficios.com>
Date:   Wed Dec 9 13:52:12 2020 -0500

    gdb: fix value_subscript when array upper bound is not known

    Since commit 7c6f27129631 ("gdb: make get_discrete_bounds check for
    non-constant range bounds"), subscripting  flexible array member fails:

        struct no_size
        {
          int n;
          int items[];
        };

        (gdb) p *ns
        $1 = {n = 3, items = 0x5555555592a4}
        (gdb) p ns->items[0]
        Cannot access memory at address 0xfffe555b733a0164
        (gdb) p *((int *) 0x5555555592a4)
        $2 = 101  <--- we would expect that
        (gdb) p &ns->items[0]
        $3 = (int *) 0xfffe5559ee829a24  <--- wrong address

    Since the flexible array member (items) has an unspecified size, the array
type
    created for it in the DWARF doesn't have dimensions (this is with gcc
9.3.0,
    Ubuntu 20.04):

        0x000000a4:   DW_TAG_array_type
                        DW_AT_type [DW_FORM_ref4]       (0x00000038 "int")
                        DW_AT_sibling [DW_FORM_ref4]    (0x000000b3)

        0x000000ad:     DW_TAG_subrange_type
                          DW_AT_type [DW_FORM_ref4]     (0x00000031 "long
unsigned int")

    This causes GDB to create a range type (TYPE_CODE_RANGE) with a defined
    constant low bound (dynamic_prop with kind PROP_CONST) and an undefined
    high bound (dynamic_prop with kind PROP_UNDEFINED).

    value_subscript gets both bounds of that range using
    get_discrete_bounds.  Before commit 7c6f27129631, get_discrete_bounds
    didn't check the kind of the dynamic_props and would just blindly read
    them as if they were PROP_CONST.  It would return 0 for the high bound,
    because we zero-initialize the range_bounds structure.  And it didn't
    really matter in this case, because the returned high bound wasn't used
    in the end.

    Commit 7c6f27129631 changed get_discrete_bounds to return a failure if
    either the low or high bound is not a constant, to make sure we don't
    read a dynamic prop that isn't a PROP_CONST as a PROP_CONST.  This
    change made get_discrete_bounds start to return a failure for that
    range, and as a result would not set *lowp and *highp.  And since
    value_subscript doesn't check get_discrete_bounds' return value, it just
    carries on an uses an uninitialized value for the low bound.  If
    value_subscript did check the return value of get_discrete_bounds, we
    would get an error message instead of a bogus value.  But it would still
    be a bug, as we wouldn't be able to print the flexible array member's
    elements.

    Looking at value_subscript, we see that the low bound is always needed,
    but the high bound is only needed if !c_style.  So, change
    value_subscript to use get_discrete_low_bound and
    get_discrete_high_bound separately.  This fixes the case described
    above, where the low bound is known but the high bound isn't (and is not
    needed).  This restores the original behavior without accessing a
    dynamic_prop in a wrong way.

    A test is added.  In addition to the case described above, a case with
    an array member of size 0 is added, which is a GNU C extension that
    existed before flexible array members were introduced.  That case
    currently fails when compiled with gcc <= 8.  gcc <= 8 produces DWARF
    similar to the one shown above, while gcc 9 adds a DW_AT_count of 0 in
    there, which makes the high bound known.  A case where an array member
    of size 0 is the only member of the struct is also added, as that was
    how PR 28675 was originally reported, and it's an interesting corner
    case that I think could trigger other funny bugs.

    Question about the implementation: in value_subscript, I made it such
    that if the low or high bound is unknown, we fall back to zero.  That
    effectively makes it the same as it was before 7c6f27129631.  But should
    we instead error() out?

    gdb/ChangeLog:

            PR 26875, PR 26901
            * gdbtypes.c (get_discrete_low_bound): Make non-static.
            (get_discrete_high_bound): Make non-static.
            * gdbtypes.h (get_discrete_low_bound): New declaration.
            (get_discrete_high_bound): New declaration.
            * valarith.c (value_subscript): Only fetch high bound if
            necessary.

    gdb/testsuite/ChangeLog:

            PR 26875, PR 26901
            * gdb.base/flexible-array-member.c: New test.
            * gdb.base/flexible-array-member.exp: New test.

    Change-Id: I832056f80e6c56f621f398b4780d55a3a1e299d7

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (5 preceding siblings ...)
  2020-12-09 21:34 ` cvs-commit at gcc dot gnu.org
@ 2020-12-09 22:11 ` simark at simark dot ca
  2021-06-27 18:00 ` ahmedsayeed1982 at yahoo dot com
                   ` (11 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: simark at simark dot ca @ 2020-12-09 22:11 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Simon Marchi <simark at simark dot ca> ---
This is now fixed.

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (6 preceding siblings ...)
  2020-12-09 22:11 ` simark at simark dot ca
@ 2021-06-27 18:00 ` ahmedsayeed1982 at yahoo dot com
  2021-08-10 12:45 ` ucelsanicin at yahoo dot com
                   ` (10 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: ahmedsayeed1982 at yahoo dot com @ 2021-06-27 18:00 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ahmedsayeed1982 at yahoo dot com

--- Comment #6 from Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> ---
This failure was introduced by commit 7c6f27129631 ("gdb: make
get_discrete_bounds check for non-constant range bounds").  Unfortunately, this
commit doesn't build, but it's trivial to fix if you want to try it: just
remove the parenthesis after `kind` that it introduces.

val_subscript passes the array's index type (of type code TYPE_CODE_RANGE) to
get_discrete_bounds.  The index type has the low bound set to constant 0 and
the high bound unknown.  Before the commit, get_discrete_bounds would return
"success" and set the low and high bound to 0.  Although it's a bit by chance
that it returned 0 for the high bound, since the bound was "unknown".  It
doesn't really matter in that case because the high bound doesn't get used by
the caller.

After the commit, the new check in get_discrete_bounds sees that the high bound
isn't a constant, so returns "failure".  However, val_subscript doesn't check
the return value, and uses the uninitialized values of low and high bounds, and
it goes downhill from there. http://mirei.xyz/

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (7 preceding siblings ...)
  2021-06-27 18:00 ` ahmedsayeed1982 at yahoo dot com
@ 2021-08-10 12:45 ` ucelsanicin at yahoo dot com
  2021-09-02 11:06 ` donipah907 at mtlcz dot com
                   ` (9 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: ucelsanicin at yahoo dot com @ 2021-08-10 12:45 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Ucel Sani <ucelsanicin at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ucelsanicin at yahoo dot com

--- Comment #7 from Ucel Sani <ucelsanicin at yahoo dot com> ---
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https://waytowhatsnext.com/

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (8 preceding siblings ...)
  2021-08-10 12:45 ` ucelsanicin at yahoo dot com
@ 2021-09-02 11:06 ` donipah907 at mtlcz dot com
  2021-09-02 11:16 ` mark at klomp dot org
                   ` (8 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: donipah907 at mtlcz dot com @ 2021-09-02 11:06 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

james rohan <donipah907 at mtlcz dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |donipah907 at mtlcz dot com

--- Comment #8 from james rohan <donipah907 at mtlcz dot com> ---
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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (9 preceding siblings ...)
  2021-09-02 11:06 ` donipah907 at mtlcz dot com
@ 2021-09-02 11:16 ` mark at klomp dot org
  2021-09-06  9:09 ` focixujo at livinginsurance dot co.uk
                   ` (7 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: mark at klomp dot org @ 2021-09-02 11:16 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (10 preceding siblings ...)
  2021-09-02 11:16 ` mark at klomp dot org
@ 2021-09-06  9:09 ` focixujo at livinginsurance dot co.uk
  2021-09-10 19:39 ` mehmetgelisin at aol dot com
                   ` (6 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: focixujo at livinginsurance dot co.uk @ 2021-09-06  9:09 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

james robin <focixujo at livinginsurance dot co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |focixujo at livinginsurance dot co
                   |                            |.uk

--- Comment #9 from james robin <focixujo at livinginsurance dot co.uk> ---
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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (11 preceding siblings ...)
  2021-09-06  9:09 ` focixujo at livinginsurance dot co.uk
@ 2021-09-10 19:39 ` mehmetgelisin at aol dot com
  2021-09-22 10:19 ` diheto5497 at secbuf dot com
                   ` (5 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: mehmetgelisin at aol dot com @ 2021-09-10 19:39 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Mehmet gelisin <mehmetgelisin at aol dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mehmetgelisin at aol dot com

--- Comment #10 from Mehmet gelisin <mehmetgelisin at aol dot com> ---
stepping over thread-lock related codes (in uClibc), the inferior process
gets stuck and never manages to enter the critical section:
http://www-look-4.com/

------8<-------
 1 size_t fwrite(const void * __restrict ptr, size_t size,
 2               size_t nmemb, register FILE * __restrict stream)
 3 { http://www.compilatori.com/
 4     size_t retval;
 5     __STDIO_AUTO_THREADLOCK_VAR;
 6  http://www.wearelondonmade.com/
 7 >   __STDIO_AUTO_THREADLOCK(stream);
 8 
 9     retval = fwrite_unlocked(ptr, size, nmemb, stream);
http://www.jopspeech.com/
10 
11     __STDIO_AUTO_THREADUNLOCK(stream);
12  http://joerg.li/ 
13     return retval;
14 }
------>8------- http://connstr.net/ 

Here, we are at line 7. Using the "next" command leads no where. However,
setting a breakpoint on line 9 and issuing "continue" works.
http://embermanchester.uk/ 

Looking at the assembly instructions reveals that we're dealing with the
http://www.slipstone.co.uk/ 
critical section entry code [1] that should never be interrupted, in this
case by the debugger's implicit breakpoints:

------8<-------
  ... http://www.logoarts.co.uk/ 
1 add_s   r0,r13,0x38
2 mov_s   r3,1
3 llock   r2,[r0]        <-.
4 brne.nt r2,0,14     --.  |
5 scond   r3,[r0]       |  |
6 bne     -10         --|--'
7 brne_s  r2,0,84     <-'
  ... http://www.acpirateradio.co.uk/ 
------>8-------

Lines 3 until 5 (inclusive) are supposed to be executed atomically. Therefore,
GDB should never (implicitly) insert a breakpoint on lines 4 and 5, else the
program will try to acquire the https://waytowhatsnext.com/  lock again by
jumping back to line 3 and
gets stuck in an infinite loop.

The solution is to make GDB aware of these patterns so it inserts breakpoints
after the sequence -- line 6 in this example.

[1]
https://cgit.uclibc-ng.org/cgi/cgit/uclibc- https://www.webb-dev.co.uk/
ng.git/tree/libc/sysdeps/linux/arc/bits/atomic.h#n46
------8<-------
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval)     \
  ({                                                                    \
        __typeof(oldval) prev;   http://www.iu-bloomington.com/                
                \
                                                                        \
        __asm__ __volatile__(                                           \
        "1:     llock   %0, [%1]        \n"                             \
        "       brne    %0, %2, 2f      \n"                             \
        "       scond   %3, [%1]        \n"                             \
        "       bnz     1b              \n"                             \
        "2:                             \n"                             \
        : "=&r"(prev)                                                   \
        : "r"(mem), "ir"(oldval), https://komiya-dental.com/                   
                \
          "r"(newval) /* can't be "ir". scond can't take limm for "b" */\
        : "cc", "memory");                                              \
                                                                        \
        prev;                                                           \

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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (12 preceding siblings ...)
  2021-09-10 19:39 ` mehmetgelisin at aol dot com
@ 2021-09-22 10:19 ` diheto5497 at secbuf dot com
  2021-10-09 11:00 ` gulsenenginar at aol dot com
                   ` (4 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: diheto5497 at secbuf dot com @ 2021-09-22 10:19 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

diheto <diheto5497 at secbuf dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |diheto5497 at secbuf dot com

--- Comment #11 from diheto <diheto5497 at secbuf dot com> ---
I have not any word to appreciate this post.....Really i am impressed from this
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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (13 preceding siblings ...)
  2021-09-22 10:19 ` diheto5497 at secbuf dot com
@ 2021-10-09 11:00 ` gulsenenginar at aol dot com
  2021-10-17 19:49 ` vmireskazki at gmail dot com
                   ` (3 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: gulsenenginar at aol dot com @ 2021-10-09 11:00 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Gulsen Engin <gulsenenginar at aol dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gulsenenginar at aol dot com

--- Comment #12 from Gulsen Engin <gulsenenginar at aol dot com> ---
gdb: fix value_subscript when array upper bound is not known
http://www-look-4.com/category/health/

    Since commit 7c6f27129631 ("gdb: make get_discrete_bounds check for
https://komiya-dental.com/category/crypto/ 
    non-constant range bounds"), subscripting  flexible array member fails:
    http://www.iu-bloomington.com/category/health/
        struct no_size
        { https://waytowhatsnext.com/category/health/
          int n;
          int items[];
        };
     http://www.wearelondonmade.com/category/health/
        (gdb) p *ns
        $1 = {n = 3, items = 0x5555555592a4}
        (gdb) p ns->items[0] http://www.jopspeech.com/category/health/
        Cannot access memory at address 0xfffe555b733a0164
        (gdb) p *((int *) 0x5555555592a4)
        $2 = 101  <--- we would expect that http://joerg.li/category/health/
        (gdb) p &ns->items[0]
        $3 = (int *) 0xfffe5559ee829a24  <--- wrong address
http://connstr.net/category/health/

    Since the flexible array member (items) has an unspecified size, the array
type
    created for it in the DWARF doesn't have dimensions (this is with gcc
9.3.0, http://embermanchester.uk/category/health/
    Ubuntu 20.04):
    http://www.slipstone.co.uk/category/health/
        0x000000a4:   DW_TAG_array_type
                        DW_AT_type [DW_FORM_ref4]       (0x00000038 "int")
                        DW_AT_sibling [DW_FORM_ref4]    (0x000000b3)
http://www.logoarts.co.uk/category/health/

        0x000000ad:     DW_TAG_subrange_type
                          DW_AT_type [DW_FORM_ref4]     (0x00000031 "long
unsigned int")
    http://www.acpirateradio.co.uk/category/health/
    This causes GDB to create a range type (TYPE_CODE_RANGE) with a defined
    constant low bound (dynamic _prop with kind PROP_CONST) and an undefined
    high bound (dynamic_prop with kind PROP_UNDEFINED).
http://www.compilatori.com/category/health/

    value_subscript gets both bounds of that range using
    get_discrete_bounds.  Before commit 7c6f27129631, get_discrete_bounds
    didn't check the kind of the dynamic_props and would just blindly read
    them as if they were PROP_CONST.
https://www.webb-dev.co.uk/category/health/  It would return 0 for the high
bound,
    because we zero-initialize the range_bounds structure.  And it didn't
    really matter in this case, because the returned high bound wasn't used
    in the end.


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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (14 preceding siblings ...)
  2021-10-09 11:00 ` gulsenenginar at aol dot com
@ 2021-10-17 19:49 ` vmireskazki at gmail dot com
  2021-10-19  7:15 ` progonsaytu at gmail dot com
                   ` (2 subsequent siblings)
  18 siblings, 0 replies; 20+ messages in thread
From: vmireskazki at gmail dot com @ 2021-10-17 19:49 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

vmireskazki at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vmireskazki at gmail dot com

--- Comment #13 from vmireskazki at gmail dot com ---
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* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (15 preceding siblings ...)
  2021-10-17 19:49 ` vmireskazki at gmail dot com
@ 2021-10-19  7:15 ` progonsaytu at gmail dot com
  2021-10-24 10:02 ` glassmtech at ukr dot net
  2021-11-25 13:58 ` mdxconcepts0008 at gmail dot com
  18 siblings, 0 replies; 20+ messages in thread
From: progonsaytu at gmail dot com @ 2021-10-19  7:15 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

progonsaytu <progonsaytu at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |progonsaytu at gmail dot com

--- Comment #14 from progonsaytu <progonsaytu at gmail dot com> ---
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^ permalink raw reply	[flat|nested] 20+ messages in thread
* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (16 preceding siblings ...)
  2021-10-19  7:15 ` progonsaytu at gmail dot com
@ 2021-10-24 10:02 ` glassmtech at ukr dot net
  2021-11-25 13:58 ` mdxconcepts0008 at gmail dot com
  18 siblings, 0 replies; 20+ messages in thread
From: glassmtech at ukr dot net @ 2021-10-24 10:02 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

glassmtech <glassmtech at ukr dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |glassmtech at ukr dot net

--- Comment #15 from glassmtech <glassmtech at ukr dot net> ---
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https://architecture-and-design-news.com

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^ permalink raw reply	[flat|nested] 20+ messages in thread
* [Bug gdb/26901] Array subscript fails with flexible array member without size
  2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
                   ` (17 preceding siblings ...)
  2021-10-24 10:02 ` glassmtech at ukr dot net
@ 2021-11-25 13:58 ` mdxconcepts0008 at gmail dot com
  18 siblings, 0 replies; 20+ messages in thread
From: mdxconcepts0008 at gmail dot com @ 2021-11-25 13:58 UTC (permalink / raw)
  To: gdb-prs

https://sourceware.org/bugzilla/show_bug.cgi?id=26901

Adamson <mdxconcepts0008 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mdxconcepts0008 at gmail dot com

--- Comment #16 from Adamson <mdxconcepts0008 at gmail dot com> ---
I really appreciate that you shared this amazing post with us, thanks for
sharing, and keep up the amazing work.
https://www.miamiphotographerfl.com/Miami-beach-photography

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end of thread, other threads:[~2021-11-25 13:58 UTC | newest]

Thread overview: 20+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-15  2:47 [Bug gdb/26901] New: Python array subscript fails with flexible array member without size simark at simark dot ca
2020-11-15  2:50 ` [Bug gdb/26901] Array " simark at simark dot ca
2020-11-15  2:50 ` simark at simark dot ca
2020-11-16 18:21 ` simark at simark dot ca
2020-12-03 19:01 ` simark at simark dot ca
2020-12-09 18:53 ` cvs-commit at gcc dot gnu.org
2020-12-09 21:34 ` cvs-commit at gcc dot gnu.org
2020-12-09 22:11 ` simark at simark dot ca
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2021-09-06  9:09 ` focixujo at livinginsurance dot co.uk
2021-09-10 19:39 ` mehmetgelisin at aol dot com
2021-09-22 10:19 ` diheto5497 at secbuf dot com
2021-10-09 11:00 ` gulsenenginar at aol dot com
2021-10-17 19:49 ` vmireskazki at gmail dot com
2021-10-19  7:15 ` progonsaytu at gmail dot com
2021-10-24 10:02 ` glassmtech at ukr dot net
2021-11-25 13:58 ` mdxconcepts0008 at gmail dot com

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