[Bug 553786] Re: *** glibc detected *** sudo: double free or corruption

[Carlos Perelló Marín]

How do you change the file rights if sudo doesn't work nor you have a
root password set nor you have direct access to the server to reboot
into single mode?

IMHO, this bug should be set as CRITICAL, given that you are "banned"
from administrate a remote server.

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Title:
  *** glibc detected *** sudo: double free or corruption

Status in “sudo” package in Ubuntu:
  New

Bug description:
  Binary package hint: sudo

  Lucid beta1, sudo 1.7.2p1-1ubuntu4. I added a file with incorrect
  permissions under /etc/sudoers.d/, and while that needed fixing,
  sudo(8) certainly shouldn't react like this:

  $ sudo bash
  sudo: /etc/sudoers.d/admin is mode 0644, should be 0440
  >>> /etc/sudoers.d/README: /etc/sudoers.d/admin near line 18 <<<
  sudo: parse error in /etc/sudoers.d/README near line 18
  sudo: no valid sudoers sources found, quitting
  *** glibc detected *** sudo: double free or corruption (!prev): 0x0861b7b0 ***
  ======= Backtrace: =========
  /lib/tls/i686/cmov/libc.so.6(+0x6b581)[0xa3a581]
  /lib/tls/i686/cmov/libc.so.6(+0x6cdd8)[0xa3bdd8]
  /lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0xa3eebd]
  /lib/tls/i686/cmov/libc.so.6(fclose+0x14a)[0xa2aa9a]
  sudo[0x805782d]
  sudo[0x80587c6]
  sudo[0x805639e]
  sudo[0x805a104]
  /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x9e5bd6]
  sudo[0x804a7c1]
  ======= Memory map: ========
  002b1000-002b7000 r-xp 00000000 08:07 16579      /lib/tls/i686/cmov/libnss_compat-2.11.1.so
  002b7000-002b8000 r--p 00006000 08:07 16579      /lib/tls/i686/cmov/libnss_compat-2.11.1.so
  002b8000-002b9000 rw-p 00007000 08:07 16579      /lib/tls/i686/cmov/libnss_compat-2.11.1.so
  003bf000-003c9000 r-xp 00000000 08:07 16581      /lib/tls/i686/cmov/libnss_files-2.11.1.so
  003c9000-003ca000 r--p 00009000 08:07 16581      /lib/tls/i686/cmov/libnss_files-2.11.1.so
  003ca000-003cb000 rw-p 0000a000 08:07 16581      /lib/tls/i686/cmov/libnss_files-2.11.1.so
  0045f000-00467000 r-xp 00000000 08:07 16583      /lib/tls/i686/cmov/libnss_nis-2.11.1.so
  00467000-00468000 r--p 00007000 08:07 16583      /lib/tls/i686/cmov/libnss_nis-2.11.1.so
  00468000-00469000 rw-p 00008000 08:07 16583      /lib/tls/i686/cmov/libnss_nis-2.11.1.so
  00542000-0055f000 r-xp 00000000 08:07 16364      /lib/libgcc_s.so.1
  0055f000-00560000 r--p 0001c000 08:07 16364      /lib/libgcc_s.so.1
  00560000-00561000 rw-p 0001d000 08:07 16364      /lib/libgcc_s.so.1
  0060b000-0060c000 r-xp 00000000 00:00 0          [vdso]
  006e6000-006e8000 r-xp 00000000 08:07 16575      /lib/tls/i686/cmov/libdl-2.11.1.so
  006e8000-006e9000 r--p 00001000 08:07 16575      /lib/tls/i686/cmov/libdl-2.11.1.so
  006e9000-006ea000 rw-p 00002000 08:07 16575      /lib/tls/i686/cmov/libdl-2.11.1.so
  0084e000-00869000 r-xp 00000000 08:07 16304      /lib/ld-2.11.1.so
  00869000-0086a000 r--p 0001a000 08:07 16304      /lib/ld-2.11.1.so
  0086a000-0086b000 rw-p 0001b000 08:07 16304      /lib/ld-2.11.1.so
  008a5000-008ae000 r-xp 00000000 08:07 16574      /lib/tls/i686/cmov/libcrypt-2.11.1.so
  008ae000-008af000 r--p 00008000 08:07 16574      /lib/tls/i686/cmov/libcrypt-2.11.1.so
  008af000-008b0000 rw-p 00009000 08:07 16574      /lib/tls/i686/cmov/libcrypt-2.11.1.so
  008b0000-008d7000 rw-p 00000000 00:00 0 
  009cf000-00b22000 r-xp 00000000 08:07 16572      /lib/tls/i686/cmov/libc-2.11.1.so
  00b22000-00b23000 ---p 00153000 08:07 16572      /lib/tls/i686/cmov/libc-2.11.1.so
  00b23000-00b25000 r--p 00153000 08:07 16572      /lib/tls/i686/cmov/libc-2.11.1.so
  00b25000-00b26000 rw-p 00155000 08:07 16572      /lib/tls/i686/cmov/libc-2.11.1.so
  00b26000-00b29000 rw-p 00000000 00:00 0 
  00c5d000-00c68000 r-xp 00000000 08:07 16381      /lib/libpam.so.0.82.2
  00c68000-00c69000 r--p 0000a000 08:07 16381      /lib/libpam.so.0.82.2
  00c69000-00c6a000 rw-p 0000b000 08:07 16381      /lib/libpam.so.0.82.2
  00e4f000-00e62000 r-xp 00000000 08:07 16578      /lib/tls/i686/cmov/libnsl-2.11.1.so
  00e62000-00e63000 r--p 00012000 08:07 16578      /lib/tls/i686/cmov/libnsl-2.11.1.so
  00e63000-00e64000 rw-p 00013000 08:07 16578      /lib/tls/i686/cmov/libnsl-2.11.1.so
  00e64000-00e66000 rw-p 00000000 00:00 0 
  08048000-08066000 r-xp 00000000 08:07 573495     /usr/bin/sudo
  08066000-08067000 r--p 0001d000 08:07 573495     /usr/bin/sudo
  08067000-08068000 rw-p 0001e000 08:07 573495     /usr/bin/sudo
  08068000-0806b000 rw-p 00000000 00:00 0 
  08612000-08633000 rw-p 00000000 00:00 0          [heap]
  b7600000-b7621000 rw-p 00000000 00:00 0 
  b7621000-b7700000 ---p 00000000 00:00 0 
  b7715000-b7754000 r--p 00000000 08:07 604029     /usr/lib/locale/en_US.utf8/LC_CTYPE
  b7754000-b7755000 r--p 00000000 08:07 604030     /usr/lib/locale/en_US.utf8/LC_NUMERIC
  b7755000-b7756000 r--p 00000000 08:07 604031     /usr/lib/locale/en_US.utf8/LC_TIME
  b7756000-b7757000 r--p 00000000 08:07 604033     /usr/lib/locale/en_US.utf8/LC_MONETARY
  b7757000-b7758000 r--p 00000000 08:07 604035     /usr/lib/locale/en_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES
  b7758000-b775a000 rw-p 00000000 00:00 0 
  b775a000-b775b000 r--p 00000000 08:07 604036     /usr/lib/locale/en_US.utf8/LC_PAPER
  b775b000-b775c000 r--p 00000000 08:07 604037     /usr/lib/locale/en_US.utf8/LC_NAME
  b775c000-b775d000 r--p 00000000 08:07 604038     /usr/lib/locale/en_US.utf8/LC_ADDRESS
  b775d000-b775e000 r--p 00000000 08:07 604039     /usr/lib/locale/en_US.utf8/LC_TELEPHONE
  b775e000-b775f000 r--p 00000000 08:07 604040     /usr/lib/locale/en_US.utf8/LC_MEASUREMENT
  b775f000-b7766000 r--s 00000000 08:07 571542     /usr/lib/gconv/gconv-modules.cache
  b7766000-b7767000 r--p 00000000 08:07 604041     /usr/lib/locale/en_US.utf8/LC_IDENTIFICATION
  b7767000-b7769000 rw-p 00000000 00:00 0 
  bfe6a000-bfe7f000 rw-p 00000000 00:00 0          [stack]
  Aborted

  
  The above stack-trace spam was trivially and consistently reproducible.

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