Cc'ing everyone as I forgot to group reply before. Also, I have included the example outputs in this reply. On Tue, Jun 28, 2022 at 12:12:15AM +0530, Gautam Menghani wrote:

On Mon, Jun 27, 2022 at 11:00:18AM -0600, Shuah Khan wrote:

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On 6/25/22 2:03 PM, SeongJae Park wrote:

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Hi Gautam,

On Sun, 26 Jun 2022 01:22:45 +0530 Gautam gautammenghani201@gmail.com wrote:

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The kernel is in lockdown mode when secureboot is enabled and hence debugfs cannot be used. Add support for this and other general cases where debugfs cannot be read and communicate the same to the user before running tests.

Signed-off-by: Gautam gautammenghani201@gmail.com

Reviewed-by: SeongJae Park sj@kernel.org

Thanks, SJ

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---

Changes in v2:

1. Modify the error message to account for general cases.
2. Change the return code so that the test is skipped.

Changes in v3:

1. Change the name of variable holding the error message.

Changes in v4:

1. Correct the mode of the source file.

tools/testing/selftests/damon/_chk_dependency.sh | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/damon/_chk_dependency.sh b/tools/testing/selftests/damon/_chk_dependency.sh index 0189db81550b..0328ac0b5a5e 100644 --- a/tools/testing/selftests/damon/_chk_dependency.sh +++ b/tools/testing/selftests/damon/_chk_dependency.sh @@ -26,3 +26,13 @@ do exit 1 fi done

+permission_error="Operation not permitted" +for f in attrs target_ids monitor_on +do

• status=$( cat "$DBGFS/$f" 2>&1 )
• if [ "${status#*$permission_error}" != "$status" ]; then

• echo "Permission for reading $DBGFS/$f denied; maybe secureboot enabled?"
  

btw - does this run as a regular user or does it need root privilege? If so add a test for that and skip with a message.

Yes this condition is reachable only with root user. If damon tests are run as regular user, the root check condition already skips the tests.

Tests output as regular user: +TAP version 13 +1..6 +# selftests: damon: debugfs_attrs.sh +# Run as root +ok 1 selftests: damon: debugfs_attrs.sh # SKIP +# selftests: damon: debugfs_schemes.sh +# Run as root

Tests output as root user: +TAP version 13 +1..6 +# selftests: damon: debugfs_attrs.sh +# Permission for reading /sys/kernel/debug/damon/attrs denied; maybe secureboot enabled? +ok 1 selftests: damon: debugfs_attrs.sh # SKIP +# selftests: damon: debugfs_schemes.sh +# Permission for reading /sys/kernel/debug/damon/attrs denied; maybe secureboot enabled?

Is any change needed in this patch?

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• exit $ksft_skip
  

• fi

+done

2.36.1

thanks, -- Shuah