[Bug 755886] Re: strace fails on non-child processes (regression)

[Adrien Nader]

There has indeed been a behaviour change a while ago. AFAIK this has
been relaxed to allow ptracing processes of the same user so this
shouldn't be an issue anymore.

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

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Title:
  strace fails on non-child processes (regression)

Status in strace package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: strace

  I've long used htop to monitor processes, and I've often used its
  ability to strace a process by hitting the S key.  In Maverick,
  however, it fails, saying "Operation not permitted."  In the kernel
  messages I see:

  ptrace of non-child pid 3846 was attempted by: strace (pid 4117)

  It used to work fine, for years.  I'm wondering if AppArmor is the
  culprit, although it doesn't mention AppArmor in the kernel message.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: strace 4.5.20-2ubuntu2 [modified: usr/bin/strace]
  ProcVersionSignature: Ubuntu 2.6.35-28.49-generic 2.6.35.11
  Uname: Linux 2.6.35-28-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Sat Apr  9 18:27:18 2011
  ProcEnviron:
   LANGUAGE=
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: strace

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