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Upstream commit 7615cae790c899bc8a82841c75c8ea9c6fa54df3 broke staprun's ability to insert a module under a stapusr ID:
----> su stapusrer -c 'staprun -vvvvv /lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko'
staprun:parse_modpath:430 inpath=/lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko
staprun:main:485 modpath="/lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko", modname="dummy"
staprun:init_staprun:391 init_staprun
staprun:insert_module:71 inserting module /lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko
staprun:insert_module:97 module options: _stp_bufsize=0
staprun:insert_module:105 module path canonicalized to '/usr/lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko'
staprun:check_signature:427 checking signature for /usr/lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko
Signature file /usr/lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko.sgn not found
staprun:check_signature:440 verify_module returns 0
staprun:insert_module:191 Module dummy inserted from file /usr/lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko
ERROR: Couldn't insert module '/lib/modules/4.18.0-240.1.1.el8_3.x86_64/systemtap/dummy.ko': File exists
ERROR: Rerun with staprun option '-R' to rename this module.
---->
There is one old and stable qe test covering this. It now fails on line 93 here:
http://pkgs.devel.redhat.com/cgit/tests/systemtap/tree/Security/CVE-2011-2502-staprun-able-to-load-arbirary-module-OF/runtest.sh#n93
Rollong back commit 7615cae790c899bc8a82841c75c8ea9c6fa54df3 does fix the issue.
The problem seems to be in init_ctl_channel() :
# su stapusrer -c 'staprun -vvvvv /lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko'
staprun:parse_modpath:430 inpath=/lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko
staprun:main:485 modpath="/lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko", modname="dummy"
staprun:init_staprun:391 init_staprun
staprun:insert_module:71 inserting module /lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko
staprun:insert_module:97 module options: _stp_bufsize=0
staprun:insert_module:105 module path canonicalized to '/usr/lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko'
staprun:check_signature:427 checking signature for /usr/lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko
Signature file /usr/lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko.sgn not found
staprun:check_signature:440 verify_module returns 0
staprun:insert_module:191 Module dummy inserted from file /usr/lib/modules/4.18.0-254.el8.x86_64/systemtap/dummy.ko
staprun:init_ctl_channel:92 Opened (-1)
ERROR: Cannot attach to module dummy control channel; not running?
staprun:remove_module:246 dummy
staprun:init_ctl_channel:92 Opened (-1)
ERROR: Cannot attach to module dummy control channel; not running?
ERROR: 'dummy' is not a zombie systemtap module.
#
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (systemtap bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:1829