[Bug gdb/18168] New: "set write on" or "--write" corrupt the binary file

["mail at cristos dot x25.pl" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18168

            Bug ID: 18168
           Summary: "set write on" or "--write" corrupt the binary file
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: critical
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: mail at cristos dot x25.pl

Created attachment 8213
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8213&action=edit
the hexdumps of a binary file before and after executing commands in the
description

When enabling binary patching via "set write on" command or "--write" command
line switch, the exectuable loaded becomes corrupted. Try executing:

$ gdb --write a_binary_file
(gdb)quit
# ./a_binary_file
bash: ./a_binary_file: cannot execute binary file: Exec format error

Careful examination of the binary shows this:
# file ./a_binary_file
a_binary_file: data

# readelf -a ./a_binary_file
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

Attached are the hexdumps of the files before and after executing "gdb --write"
and quitting gdb immediately

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