Red Hat Bugzilla – Bug 312031
utrace: /proc/<pid>/maps not always accessible when receiving PTRACE_EVENT_EXIT
Last modified: 2008-02-07 23:24:39 EST
+++ This bug was initially created as a clone of Bug #285761 +++
Backport of the Rawhide Bug for FC-6.
Description of problem:
I trace a process using ptrace and the PTRACE_O_TRACEEXIT option. When I get
the PTRACE_EVENT_EXIT notification for the process I examine its memory
mappings by reading /proc/<pid>/maps. This works on vanilla Linux kernels.
On the Fedora kernel this works if the process exited normally, but if it was
killed by a signal I get EACCES when trying to open /proc/<pid>/maps.
I guess this is undocumented behaviour, but it would be good to know if I
should expect a fix or work around the problem somehow.
I am running the x86_64 version of the kernel on a Core 2 T7200.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Compile and run the attached test case.
Test case fails to open /proc/<pid>/maps.
Test case prints the contents of /proc/<pid>/maps.
Created attachment 211161 [details]
(This is a mass-update to all current FC6 kernel bugs in NEW state)
I'm reviewing this bug list as part of the kernel bug triage project, an attempt
to isolate current bugs in the Fedora kernel.
I am CC'ing myself to this bug, however this version of Fedora is no longer
Please attempt to reproduce this bug with a current version of Fedora (presently
Fedora 8). If the bug no longer exists, please close the bug or I'll do so in a
few days if there is no further information lodged.
Thanks for using Fedora!
Per the previous comment in this bug, I am closing it as INSUFFICIENT_DATA,
since no information has been lodged for over 30 days.
Please re-open this bug or file a new one if you can provide the requested data,
and thanks for filing the original report!