https://bugzilla.redhat.com/show_bug.cgi?id=1246467

Bug ID: 1246467 Summary: cdtdebug: in F22, YAMA disallows ptrace, gdb attach fails and the CDT UI does not report that to user Product: Fedora Version: 22 Component: eclipse-cdt Assignee: jjohnstn@redhat.com Reporter: mstahl@redhat.com QA Contact: extras-qa@fedoraproject.org CC: akurtako@redhat.com, eclipse-sig@lists.fedoraproject.org, jjohnstn@redhat.com, krzysztof.daniel@gmail.com, rgrunber@redhat.com

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