Re: [libunwind] remote unwinding and ptrace()

[Umut Aymakoglu]

Hi David -
You are right it is not completely libunwind issue. It is a ptrace() problem; a non-root process can not attach to a setuid/setgid process.This is mentioned in the man page of ptrace.
In this case is there an alternative to ptrace()?

thanks,
Umut
David Mosberger <address@hidden>

David Mosberger <address@hidden> Sent by: address@hidden 12/11/2003 02:50 PM Please respond to davidm

To: Umut Aymakoglu/Menlo Park/address@hidden cc: address@hidden Subject: Re: [libunwind] remote unwinding and ptrace()

Hi Umut,

>>>>> On Thu, 11 Dec 2003 13:54:15 -0800, Umut Aymakoglu <address@hidden> said:

  Umut> Hi - I have the following problem: The owner of the target
  Umut> process is root and the permissions are 6755 (-rwsr-sr-x). The
  Umut> program that will attach and unwind the target process does
  Umut> not have the root ownership and the permissions are
  Umut> 2755(-rwxr-sr-x).  The group ids are same on both of the
  Umut> programs. The program does a ptrace(PTRACE_ATTACH) call to
  Umut> attach the target process and receives EPERM error. The 2nd
  Umut> program can not have the root ownership. Is there a way to
  Umut> make this work?

I don't see why this is a libunwind-specific question.  If process A
cannot access process B, then how could A have any hope to unwind B,
whether or not libunwind is involved.  Am I missing something?

		 --david
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