Bug 1246467

Summary:	cdtdebug: in F22, YAMA disallows ptrace, gdb attach fails and the CDT UI does not report that to user
Product:	[Fedora] Fedora	Reporter:	Michael Stahl <mstahl>
Component:	eclipse-cdt	Assignee:	Jeff Johnston <jjohnstn>
Status:	CLOSED EOL	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	22	CC:	akurtako, eclipse-sig, jjohnstn, krzysztof.daniel, rgrunber
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-07-19 17:09:38 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Michael Stahl 2015-07-24 12:05:14 UTC

Description of problem:

in Fedora 22, YAMA disallows ptrace, gdb attach fails and the CDT UI does not report that to user.

Version-Release number of selected component (if applicable):

gdb-7.9.1-17.fc22.x86_64
eclipse-platform-4.4.2-6.fc22.x86_64
eclipse-cdt-parsers-8.6.0-2.fc22.x86_64
eclipse-valgrind-3.2.0-1.fc22.noarch
eclipse-jdt-4.4.2-6.fc22.x86_64
eclipse-cdt-8.6.0-2.fc22.x86_64
eclipse-linuxtools-3.2.0-1.fc22.noarch

How reproducible:

by default in Fedora 22, YAMA disallows ptrace:

  > cat /proc/sys/kernel/yama/ptrace_scope
  1

Steps to Reproduce:
1. run "cdtdebug"
2. hit F11 to debug
3. select some process running under your UID to attach

Actual results:

attaching to process silently fails.

only if you switch to the "GDB traces" console you can see this:
  384,219 18-target-attach --thread-group i1 6638
  384,220 18^error,msg="ptrace: Operation not permitted."


Expected results:

Qt Creator handles this failure better, it pops up a dialog that says:

  ptrace: Operation not permitted.

  Could not attach to the process. Make sure no other debugger traces this process.
  If your uid matches the uid
  of the target process, check the settings of
  /proc/sys/kernel/yama/ptrace_scope
  For more details, see /etc/sysctl.d/10-ptrace.conf

Additional info:

there is a bug about the YAMA default setting:

https://bugzilla.redhat.com/show_bug.cgi?id=1209492

Comment 1 Roland Grunberg 2015-07-24 14:18:26 UTC

This was also reported as Bug 1245759 , which depends on the top-level bug for this. The fact that this fails silently is a bug, and a nice error message would go a long way.

Comment 2 Fedora End Of Life 2016-07-19 17:09:38 UTC

Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this
bug.

Thank you for reporting this bug and we are sorry it could not be fixed.