Testing EACCES/EPERM generation... FAILED

[zhijianli88]

i run the test with v4.13-rc1 at haswell platform under root, and some result like below

lizhijian@inn:/result/perf_event_tests/disallow_cpu_events/lkp-hsw-d01/debian-x86_64-2016-08-31.cgz/x86_64-rhel-7.2/gcc-6/5771a8c08880cdca3bfb4a3fc6d309d6bba20877/0$ cat perf_event_tests | grep -e FAILED -e NEED -e UNEX -e SKIP
    Testing inherit_stat...                                      UNEXPLAINED
    Testing EACCES generation...                                 FAILED   <== diff
    Testing EPERM generation...                                  FAILED  <== diff
    Testing if non-existent events fail...                       SKIPPED
    Testing hardware breakpoint overflow...                      UNEXPLAINED
    Testing simultaneous one-shot group overflow...              FAILED
    Testing if we can skid into kernel...                        FAILED
    Testing if event constraints are enforced...                 SKIPPED
    Testing if minimized rdpmc papi-multi-attach works...        FAILED

there are two different cases comparing to your uploaded results (results/haswell/haswell-4.13-rc0 )
For the EACCES, it can be passed if i run it with a normal user
For the EPERM, it always failed under both root and normal user

want to know, is EACCES required under root, what's user when you run thoes cases
and any idea about EPERM?

[deater]

Try most recent git, it should fix the "running as root" issue.

I don't know why EPERM would fail as a normal user. What is your perf_event_paranoid setting?

[zhijianli88]

thanks a lot, i try the latest code d2b3ee1
with perf_event_paranoid = 2

lizhijian@haswell-OptiPlex-9020:~/perf_event_tests/tests/error_returns$ ./eacces 
This tries to get perf_event_open() to generate
an EACCES return.

+ Trying to attach to CPU with "any thread" set
	Paranoid = 2
	Properly triggered EACCES
+ Trying to attach to PID1
	paranoid=2 uid=1002
	Properly triggered EACCES
Testing EACCES generation...                               PASSED
lizhijian@haswell-OptiPlex-9020:~/perf_event_tests/tests/error_returns$ sudo ./eacces 
[sudo] password for lizhijian: 
This tries to get perf_event_open() to generate
an EACCES return.

+ Trying to attach to CPU with "any thread" set
	Paranoid = 2
	Unexpectedly opened properly.
+ Trying to attach to PID1
	paranoid=2 uid=0
	Was able to open as you are running as root
Testing EACCES generation...                               FAILED

lizhijian@haswell-OptiPlex-9020:~/perf_event_tests/tests/error_returns$ ./eperm 
This tries to get perf_event_open() to generate an EPERM errno.

+ Attempting to set a breakpoint on a kernel address
Unexpectedly got: Permission denied
Testing EPERM generation...                                FAILED
lizhijian@haswell-OptiPlex-9020:~/perf_event_tests/tests/error_returns$ sudo ./eperm
This tries to get perf_event_open() to generate an EPERM errno.

+ Attempting to set a breakpoint on a kernel address
	Was able to set kernel breakpoint because you are running as root
Testing EPERM generation...                                PASSED

i will try other perf_event_paranoid setting later.

[zhijianli88]

and current, some cases would have different result with different user and different perf_event_paranoid

e2big  eacces einval enoent  eopnotsupp    eperm    esrch 

for perf_event_paranoid with -1 and 0, the above cases are all passed under root and normal user
for perf_event_paranoid with 1 and 2, above cases result like below:

root@haswell-OptiPlex-9020:/home/lizhijian/perf_event_tests/tests/error_returns# for t in e2big  eacces einval enoent  eopnotsupp  eperm    esrch ; do for s in 1 2; do echo $s >/proc/sys/kernel/perf_event_paranoid; echo -n "|$t|$s|root| "; ./$t|grep Testing | awk '{print $NF "|"}'; echo -n "|$t|$s|non-root| "; su lizhijian -c ./$t |grep Testing | awk '{print $NF "|"}'; done; done

case	paranoid	user	result
e2big	1	root	PASSED
e2big	1	non-root	PASSED
e2big	2	root	PASSED
e2big	2	non-root	FAILED
eacces	1	root	FAILED
eacces	1	non-root	PASSED
eacces	2	root	FAILED
eacces	2	non-root	PASSED
einval	1	root	PASSED
einval	1	non-root	PASSED
einval	2	root	PASSED
einval	2	non-root	FAILED
enoent	1	root	PASSED
enoent	1	non-root	PASSED
enoent	2	root	PASSED
enoent	2	non-root	FAILED
eopnotsupp	1	root	PASSED
eopnotsupp	1	non-root	PASSED
eopnotsupp	2	root	PASSED
eopnotsupp	2	non-root	FAILED
eperm	1	root	PASSED
eperm	1	non-root	PASSED
eperm	2	root	PASSED
eperm	2	non-root	FAILED
esrch	1	root	PASSED
esrch	1	non-root	PASSED
esrch	2	root	PASSED
esrch	2	non-root	FAILED

i'm new to perf_event_tests, so want to know is above result as expected