[Bug libc/10149] stack guard should lead with zero byte to gain protections from str* writes

["gulsenenginar at aol dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=10149

Gulsen Engin <gulsenenginar at aol dot com> changed:

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

--- Comment #6 from Gulsen Engin <gulsenenginar at aol dot com> ---
$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off"
-ex "file -readnow ~/a.out" http://www-look-4.com/category/technology/
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098:
https://komiya-dental.com/shopping/safety-for-online-shopping/ internal-error:
void create_all_comp_units(dwarf2_per_objfile*): Assertion
`per_objfile->per_bfd->all_comp_units.empty ()' failed.
    http://www.iu-bloomington.com/health/health-and-cannabis/
    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature.  Things work well when loading a binary with
https://waytowhatsnext.com/crypto/bought-house-with-bitcoin/ 
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when loading a binary with different
    methods.  See this previous fix, for example:
    http://www.wearelondonmade.com/category/health/
        efb763a5ea35 ("gdb: check for partial symtab presence in
dwarf2_initialize_objfile")

    That one handled the case where the first load is normal (uses partial
    symbols) and the second load uses an index.
http://www.jopspeech.com/category/services/

    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method. http://joerg.li/category/health/  When
loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A http://connstr.net/category/health/
$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off"
-ex "file -readnow ~/a.out" http://embermanchester.uk/category/health/
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error:
void create_all_comp_units(dwarf2_per_objfile*): Assertion
http://www.slipstone.co.uk/category/health/ 
`per_objfile->per_bfd->all_comp_units.empty ()' failed.

    This is a recurring problem that exposes a design issue in the DWARF
http://www.logoarts.co.uk/category/services/ 
    per-BFD sharing feature.  Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when
http://www.acpirateradio.co.uk/category/tech/ loading a binary with different
    methods.  See this previous fix, for example:

        efb763a5ea35 ("gdb: check for partial symtab presence in
dwarf2_initialize_objfile")
     http://www.compilatori.com/category/health/
    That one handled the case where the first load is normal (uses partial
    symbols) and the second load uses an index.

    The problem is that when loading an objfile with a method A, we create a
    dwarf2_per_bfd and some dwarf2_per_cu_data and initialize them with the
    data belonging to that method.  When loading another obfile sharing the
    same BFD but with a different method B, it's not clear how to re-use the
    dwarf2_per_bfd/dwarf2_per_cu_data previously created, because they
    contain the data specific to method A
https://www.webb-dev.co.uk/health/health-and-cannabis/
$ ./gdb -nx -q --data-directory=data-directory ~/a.out -ex "set confirm off"
-ex "file -readnow ~/a.out"
        Reading symbols from /home/simark/a.out...
        Reading symbols from ~/a.out...
        /home/simark/src/binutils-gdb/gdb/dwarf2/read.c:8098: internal-error:
void create_all_comp_units(dwarf2_per_objfile*): Assertion
`per_objfile->per_bfd->all_comp_units.empty ()' failed.

    This is a recurring problem that exposes a design issue in the DWARF
    per-BFD sharing feature.  Things work well when loading a binary with
    the same method (with/without index, with/without readnow) twice in a
    row.  But they don't work so well when loading a binary with different
    methods.  See this previous fix, for example:

        efb763a5ea35 ("gdb: check for partial symtab presence in
dwarf2_initialize_objfile"

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