[Bug 329221] Re: valgrind --db-attach /proc/$PID/fd permission problem

[Alessandro Ghedini]

> This is completely unrelated; ptrace is disabled after process startup for non-root users in Ubuntu nowadays.
> https://wiki.ubuntu.com/Security/Features#PTRACE%20scope

Closing as invalid.

** Changed in: valgrind (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/329221

Title:
  valgrind --db-attach /proc/$PID/fd permission problem

Status in “valgrind” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: valgrind

  Something has broken valgrind --db-attach=yes
  I get the following output:

  ==31556== ---- Attach to debugger ? --- [Return/N/n/Y/y/C/c] ---- Y
  ==31556== starting debugger with cmd: /usr/bin/gdb -nw /proc/32002/fd/1014 32002
  GNU gdb 6.8-debian
  Copyright (C) 2008 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "i486-linux-gnu"...
  NEdit display disabled.  Use 'nedit' to enable.
  Attaching to program: /proc/32002/fd/1014, process 32002
  Cannot access memory at address 0x6d287465
  /proc/32002/fd/1014: Permission denied.

  32002 seems to be a child process forked by valgrind to run the
  debugger:

  jason at feegle$ ps -ef | fgrep 31556
  jason    31556 31506  3 15:03 pts/2    00:00:15 /usr/bin/valgrind.bin --db-attach=yes ./testcxx block19.cub
  jason    32002 31556  0 15:10 pts/2    00:00:00 [memcheck] <defunct>
  jason    32003 31556  0 15:10 pts/2    00:00:00 /bin/sh -c /usr/bin/gdb -nw /proc/32002/fd/1014 32002

  jason at feegle$ ls -ld /proc/32002 /proc/32002/fd
  dr-xr-xr-x 7 jason jason 0 2009-02-13 15:10 /proc/32002
  dr-x------ 2 root  root  0 2009-02-13 15:10 /proc/32002/fd

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