prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  bug of function get_load_segment_info in readelf.py
  when I got readelf result like below
  ```
  readelf --program-headers /bin/ls | grep "LOAD" -A 10
    LOAD           0x0000000000000000 0x0000000000400000 0x0000000000400000
                   0x000000000001da64 0x000000000001da64  R E    200000
  ```
  the function crashed at line 65
  ```
  65   fsize, msize, read, write, execute, align = re_secnd.match(line).groups()
  ```
  the reason is in the regex format
  ```python
  re_secnd = re.compile(r"\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\s+(**0x**[0-9A-Fa-f]+)"
  ```
  I mean, "0x" should not a absolute prefix of align number
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `pwndbg/wrappers/readelf.py`
  Content:
  ```
  1 #!/usr/bin/env python
  2 # -*- coding: utf-8 -*-
  3 from __future__ import absolute_import
  4 from __future__ import division
  5 from __future__ import print_function
  6 from __future__ import unicode_literals
  7 
  8 import re
  9 
  10 import pwndbg.wrappers
  11 
  12 cmd_name = "readelf"
  13 
  14 @pwndbg.wrappers.OnlyWithCommand(cmd_name)
  15 def get_jmpslots():
  16     local_path = pwndbg.file.get_file(pwndbg.proc.exe)
  17     cmd = [get_jmpslots.cmd_path, "--relocs", local_path]
  18     readelf_out = pwndbg.wrappers.call_cmd(cmd)
  19 
  20     return filter(_extract_jumps, readelf_out.splitlines())
  21 
  22 def _extract_jumps(line):
  23     '''
  24      Checks for records in `readelf --relocs <binary>` which has type e.g. `R_X86_64_JUMP_SLO`
  25      NOTE: Because of that we DO NOT display entries that are not writeable (due to FULL RELRO)
  26      as they have `R_X86_64_GLOB_DAT` type.
  27 
  28     It might be good to display them seperately in the future.
  29     '''
  30     try:
  31         if "JUMP" in line.split()[2]:
  32             return line
  33         else:
  34             return False
  35     except IndexError:
  36         return False
  37 
  38 @pwndbg.wrappers.OnlyWithCommand(cmd_name)
  39 def get_load_segment_info():
  40     '''
  41     Looks for LOAD sections by parsing the output of `readelf --program-headers <binary>`
  42     '''
  43     local_path = pwndbg.file.get_file(pwndbg.proc.exe)
  44     cmd = [get_jmpslots.cmd_path, "--program-headers", local_path]
  45     readelf_out = pwndbg.wrappers.call_cmd(cmd)
  46 
  47     segments = []
  48     load_found = False
  49 
  50     # Output from readelf is 
  51     # Type           Offset             VirtAddr           PhysAddr
  52     #                FileSiz            MemSiz             Flags  Align
  53     # LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
  54     #                0x0000000000000830 0x0000000000000830  R E    0x200000
  55     # Account for this using two regular expressions
  56     re_first = re.compile(r"\s+LOAD\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)")
  57     re_secnd = re.compile(r"\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\s+(0x[0-9A-Fa-f]+)")
  58     hex2int = lambda x: int(x, 16)
  59 
  60     for line in readelf_out.splitlines():
  61         if "LOAD" in line:
  62             load_found = True
  63             offset, vaddr, paddr = map(hex2int, re_first.match(line).groups())
  64         elif load_found:
  65             fsize, msize, read, write, execute, align = re_secnd.match(line).groups()
  66             fsize, msize, align = map(hex2int, (fsize, msize, align))
  67             read = read == "R"
  68             write = write == "W"
  69             execute = execute == "E"
  70 
  71             segments.append({"Offset":   offset,
  72                              "VirtAddr": vaddr,
  73                              "PhysAddr": paddr,
  74                              "FileSiz": fsize,
  75                              "MemSiz": msize,
  76                              "FlagsRead": read,
  77                              "FlagsWrite": write,
  78                              "FlagsExecute": execute})
  79 
  80             load_found = False
  81 
  82     return segments
  83
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/pwndbg/wrappers/readelf.py b/pwndbg/wrappers/readelf.py
  --- a/pwndbg/wrappers/readelf.py
  +++ b/pwndbg/wrappers/readelf.py
  @@ -52,9 +52,15 @@
       #                FileSiz            MemSiz             Flags  Align
       # LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
       #                0x0000000000000830 0x0000000000000830  R E    0x200000
  +    #
  +    ############################################################################
  +    #
  +    # NOTE: On some readelf versions the Align column might not be prefixed with 0x
  +    # See https://github.com/pwndbg/pwndbg/issues/427
  +    #
       # Account for this using two regular expressions
       re_first = re.compile(r"\s+LOAD\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)")
  -    re_secnd = re.compile(r"\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\s+(0x[0-9A-Fa-f]+)")
  +    re_secnd = re.compile(r"\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\s+(0x)?([0-9A-Fa-f]+)")
       hex2int = lambda x: int(x, 16)
   
       for line in readelf_out.splitlines():
  @@ -62,8 +68,8 @@
               load_found = True
               offset, vaddr, paddr = map(hex2int, re_first.match(line).groups())
           elif load_found:
  -            fsize, msize, read, write, execute, align = re_secnd.match(line).groups()
  -            fsize, msize, align = map(hex2int, (fsize, msize, align))
  +            fsize, msize, read, write, execute, _optional_prefix, align = re_secnd.match(line).groups()
  +            fsize, msize, align = map(hex2int, (fsize, msize, '0x' + align))
               read = read == "R"
               write = write == "W"
               execute = execute == "E"
  
verification_info: {"golden_diff": "diff --git a/pwndbg/wrappers/readelf.py b/pwndbg/wrappers/readelf.py\n--- a/pwndbg/wrappers/readelf.py\n+++ b/pwndbg/wrappers/readelf.py\n@@ -52,9 +52,15 @@\n     #                FileSiz            MemSiz             Flags  Align\n     # LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000\n     #                0x0000000000000830 0x0000000000000830  R E    0x200000\n+    #\n+    ############################################################################\n+    #\n+    # NOTE: On some readelf versions the Align column might not be prefixed with 0x\n+    # See https://github.com/pwndbg/pwndbg/issues/427\n+    #\n     # Account for this using two regular expressions\n     re_first = re.compile(r\"\\s+LOAD\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)\")\n-    re_secnd = re.compile(r\"\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\\s+(0x[0-9A-Fa-f]+)\")\n+    re_secnd = re.compile(r\"\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\\s+(0x)?([0-9A-Fa-f]+)\")\n     hex2int = lambda x: int(x, 16)\n \n     for line in readelf_out.splitlines():\n@@ -62,8 +68,8 @@\n             load_found = True\n             offset, vaddr, paddr = map(hex2int, re_first.match(line).groups())\n         elif load_found:\n-            fsize, msize, read, write, execute, align = re_secnd.match(line).groups()\n-            fsize, msize, align = map(hex2int, (fsize, msize, align))\n+            fsize, msize, read, write, execute, _optional_prefix, align = re_secnd.match(line).groups()\n+            fsize, msize, align = map(hex2int, (fsize, msize, '0x' + align))\n             read = read == \"R\"\n             write = write == \"W\"\n             execute = execute == \"E\"\n", "issue": "bug of function get_load_segment_info in readelf.py\nwhen I got readelf result like below\r\n```\r\nreadelf --program-headers /bin/ls | grep \"LOAD\" -A 10\r\n  LOAD           0x0000000000000000 0x0000000000400000 0x0000000000400000\r\n                 0x000000000001da64 0x000000000001da64  R E    200000\r\n```\r\nthe function crashed at line 65\r\n```\r\n65   fsize, msize, read, write, execute, align = re_secnd.match(line).groups()\r\n```\r\nthe reason is in the regex format\r\n```python\r\nre_secnd = re.compile(r\"\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\\s+(**0x**[0-9A-Fa-f]+)\"\r\n```\r\nI mean, \"0x\" should not a absolute prefix of align number\n", "before_files": [{"content": "#!/usr/bin/env python\n# -*- coding: utf-8 -*-\nfrom __future__ import absolute_import\nfrom __future__ import division\nfrom __future__ import print_function\nfrom __future__ import unicode_literals\n\nimport re\n\nimport pwndbg.wrappers\n\ncmd_name = \"readelf\"\n\n@pwndbg.wrappers.OnlyWithCommand(cmd_name)\ndef get_jmpslots():\n    local_path = pwndbg.file.get_file(pwndbg.proc.exe)\n    cmd = [get_jmpslots.cmd_path, \"--relocs\", local_path]\n    readelf_out = pwndbg.wrappers.call_cmd(cmd)\n\n    return filter(_extract_jumps, readelf_out.splitlines())\n\ndef _extract_jumps(line):\n    '''\n     Checks for records in `readelf --relocs <binary>` which has type e.g. `R_X86_64_JUMP_SLO`\n     NOTE: Because of that we DO NOT display entries that are not writeable (due to FULL RELRO)\n     as they have `R_X86_64_GLOB_DAT` type.\n\n    It might be good to display them seperately in the future.\n    '''\n    try:\n        if \"JUMP\" in line.split()[2]:\n            return line\n        else:\n            return False\n    except IndexError:\n        return False\n\n@pwndbg.wrappers.OnlyWithCommand(cmd_name)\ndef get_load_segment_info():\n    '''\n    Looks for LOAD sections by parsing the output of `readelf --program-headers <binary>`\n    '''\n    local_path = pwndbg.file.get_file(pwndbg.proc.exe)\n    cmd = [get_jmpslots.cmd_path, \"--program-headers\", local_path]\n    readelf_out = pwndbg.wrappers.call_cmd(cmd)\n\n    segments = []\n    load_found = False\n\n    # Output from readelf is \n    # Type           Offset             VirtAddr           PhysAddr\n    #                FileSiz            MemSiz             Flags  Align\n    # LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000\n    #                0x0000000000000830 0x0000000000000830  R E    0x200000\n    # Account for this using two regular expressions\n    re_first = re.compile(r\"\\s+LOAD\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)\")\n    re_secnd = re.compile(r\"\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\\s+(0x[0-9A-Fa-f]+)\")\n    hex2int = lambda x: int(x, 16)\n\n    for line in readelf_out.splitlines():\n        if \"LOAD\" in line:\n            load_found = True\n            offset, vaddr, paddr = map(hex2int, re_first.match(line).groups())\n        elif load_found:\n            fsize, msize, read, write, execute, align = re_secnd.match(line).groups()\n            fsize, msize, align = map(hex2int, (fsize, msize, align))\n            read = read == \"R\"\n            write = write == \"W\"\n            execute = execute == \"E\"\n\n            segments.append({\"Offset\":   offset,\n                             \"VirtAddr\": vaddr,\n                             \"PhysAddr\": paddr,\n                             \"FileSiz\": fsize,\n                             \"MemSiz\": msize,\n                             \"FlagsRead\": read,\n                             \"FlagsWrite\": write,\n                             \"FlagsExecute\": execute})\n\n            load_found = False\n\n    return segments\n", "path": "pwndbg/wrappers/readelf.py"}], "after_files": [{"content": "#!/usr/bin/env python\n# -*- coding: utf-8 -*-\nfrom __future__ import absolute_import\nfrom __future__ import division\nfrom __future__ import print_function\nfrom __future__ import unicode_literals\n\nimport re\n\nimport pwndbg.wrappers\n\ncmd_name = \"readelf\"\n\n@pwndbg.wrappers.OnlyWithCommand(cmd_name)\ndef get_jmpslots():\n    local_path = pwndbg.file.get_file(pwndbg.proc.exe)\n    cmd = [get_jmpslots.cmd_path, \"--relocs\", local_path]\n    readelf_out = pwndbg.wrappers.call_cmd(cmd)\n\n    return filter(_extract_jumps, readelf_out.splitlines())\n\ndef _extract_jumps(line):\n    '''\n     Checks for records in `readelf --relocs <binary>` which has type e.g. `R_X86_64_JUMP_SLO`\n     NOTE: Because of that we DO NOT display entries that are not writeable (due to FULL RELRO)\n     as they have `R_X86_64_GLOB_DAT` type.\n\n    It might be good to display them seperately in the future.\n    '''\n    try:\n        if \"JUMP\" in line.split()[2]:\n            return line\n        else:\n            return False\n    except IndexError:\n        return False\n\n@pwndbg.wrappers.OnlyWithCommand(cmd_name)\ndef get_load_segment_info():\n    '''\n    Looks for LOAD sections by parsing the output of `readelf --program-headers <binary>`\n    '''\n    local_path = pwndbg.file.get_file(pwndbg.proc.exe)\n    cmd = [get_jmpslots.cmd_path, \"--program-headers\", local_path]\n    readelf_out = pwndbg.wrappers.call_cmd(cmd)\n\n    segments = []\n    load_found = False\n\n    # Output from readelf is \n    # Type           Offset             VirtAddr           PhysAddr\n    #                FileSiz            MemSiz             Flags  Align\n    # LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000\n    #                0x0000000000000830 0x0000000000000830  R E    0x200000\n    #\n    ############################################################################\n    #\n    # NOTE: On some readelf versions the Align column might not be prefixed with 0x\n    # See https://github.com/pwndbg/pwndbg/issues/427\n    #\n    # Account for this using two regular expressions\n    re_first = re.compile(r\"\\s+LOAD\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)\")\n    re_secnd = re.compile(r\"\\s+(0x[0-9A-Fa-f]+) (0x[0-9A-Fa-f]+)  (.)(.)(.)\\s+(0x)?([0-9A-Fa-f]+)\")\n    hex2int = lambda x: int(x, 16)\n\n    for line in readelf_out.splitlines():\n        if \"LOAD\" in line:\n            load_found = True\n            offset, vaddr, paddr = map(hex2int, re_first.match(line).groups())\n        elif load_found:\n            fsize, msize, read, write, execute, _optional_prefix, align = re_secnd.match(line).groups()\n            fsize, msize, align = map(hex2int, (fsize, msize, '0x' + align))\n            read = read == \"R\"\n            write = write == \"W\"\n            execute = execute == \"E\"\n\n            segments.append({\"Offset\":   offset,\n                             \"VirtAddr\": vaddr,\n                             \"PhysAddr\": paddr,\n                             \"FileSiz\": fsize,\n                             \"MemSiz\": msize,\n                             \"FlagsRead\": read,\n                             \"FlagsWrite\": write,\n                             \"FlagsExecute\": execute})\n\n            load_found = False\n\n    return segments\n", "path": "pwndbg/wrappers/readelf.py"}]}