* [Bug tapsets/19065] New: task_fd_lookup() can crash the s390x kernel when invoked with an invalid input
@ 2015-10-05 12:41 mcermak at redhat dot com
2015-10-05 18:12 ` [Bug tapsets/19065] " dsmith at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: mcermak at redhat dot com @ 2015-10-05 12:41 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=19065
Bug ID: 19065
Summary: task_fd_lookup() can crash the s390x kernel when
invoked with an invalid input
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: tapsets
Assignee: systemtap at sourceware dot org
Reporter: mcermak at redhat dot com
CC: dsmith at redhat dot com
Target Milestone: ---
Following seems to panic the el[567] s390x kernel:
stap -ge 'probe oneshot{ println(task_fd_lookup(0,1)) }'
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* [Bug tapsets/19065] task_fd_lookup() can crash the s390x kernel when invoked with an invalid input
2015-10-05 12:41 [Bug tapsets/19065] New: task_fd_lookup() can crash the s390x kernel when invoked with an invalid input mcermak at redhat dot com
@ 2015-10-05 18:12 ` dsmith at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: dsmith at redhat dot com @ 2015-10-05 18:12 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=19065
David Smith <dsmith at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from David Smith <dsmith at redhat dot com> ---
Fixed in commit d3be3bf (tested on s390x rhel7).
We were checking for read access to the task structure, but just because we can
safely read the task structure doesn't mean we can safely write to the task
structure. Fixed by no longer trying to lock the task structure.
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2015-10-05 12:41 [Bug tapsets/19065] New: task_fd_lookup() can crash the s390x kernel when invoked with an invalid input mcermak at redhat dot com
2015-10-05 18:12 ` [Bug tapsets/19065] " dsmith at redhat dot com
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