Bug #17650: ceph daemons DUMPABLE flag is cleared by setuid preventing coredumps - Ceph - Ceph

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Bug #17650

closed

ceph daemons DUMPABLE flag is cleared by setuid preventing coredumps

Added by Patrick Donnelly over 7 years ago. Updated about 7 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Patrick Donnelly

Category:

common

Target version:

% Done:

100%

Source:

Development

Tags:

Backport:

jewel

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

I observed while using ceph-ansible on Linode that ceph daemons would not produce coredumps. This was caused by the DUMPABLE flag being cleared by prctl. From prctl(2):

       PR_SET_DUMPABLE (since Linux 2.3.20)

          ...

          Normally, this flag is set to 1.  However, it is reset to the current value contained in the file /proc/sys/fs/suid_dumpable (which by default has the value 0), in the fol‐
          lowing circumstances:

          *  The process's effective user or group ID is changed.

          *  The process's filesystem user or group ID is changed (see credentials(7)).

          *  The process executes (execve(2)) a set-user-ID or set-group-ID program, or a program that has capabilities (see capabilities(7)).

I have a patch ready to submit after creating this issue.

Subtasks 1 (0 open — 1 closed)