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[157.230.128.187]) by smtp.gmail.com with ESMTPSA id m15sm247162pgv.45.2020.06.10.08.49.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jun 2020 08:49:33 -0700 (PDT) Received: by 42.do-not-panic.com (Postfix, from userid 1000) id 94C9741DD1; Wed, 10 Jun 2020 15:49:25 +0000 (UTC) From: "Luis R. Rodriguez" To: gregkh@linuxfoundation.org, viro@zeniv.linux.org.uk, philipp.reisner@linbit.com, lars.ellenberg@linbit.com, axboe@kernel.dk, bfields@fieldses.org, chuck.lever@oracle.com, roopa@cumulusnetworks.com, nikolay@cumulusnetworks.com, davem@davemloft.net, kuba@kernel.org, dhowells@redhat.com, jarkko.sakkinen@linux.intel.com, jmorris@namei.org, serge@hallyn.com, christian.brauner@ubuntu.com Cc: slyfox@gentoo.org, ast@kernel.org, keescook@chromium.org, josh@joshtriplett.org, ravenexp@gmail.com, chainsaw@gentoo.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, bridge@lists.linux-foundation.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Luis Chamberlain , Tiezhu Yang Subject: [PATCH 5/5] selftests: simplify kmod failure value Date: Wed, 10 Jun 2020 15:49:23 +0000 Message-Id: <20200610154923.27510-6-mcgrof@kernel.org> X-Mailer: git-send-email 2.23.0.rc1 In-Reply-To: <20200610154923.27510-1-mcgrof@kernel.org> References: <20200610154923.27510-1-mcgrof@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: From: Luis Chamberlain The "odd" 256 value was just an issue with the umh never wrapping it around with WEXITSTATUS() for us. Now that it does that, we can use a sane value / name for the selftest, and this is no longer a oddity. We add a way to detect this for older kernels, and support the old return value for kernel code where it was given. This never affected userspace. Reported-by: Tiezhu Yang Signed-off-by: Luis Chamberlain --- tools/testing/selftests/kmod/kmod.sh | 46 +++++++++++++++++++++++----- 1 file changed, 39 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/kmod/kmod.sh b/tools/testing/selftests/kmod/kmod.sh index da60c3bd4f23..df7b21d8561c 100755 --- a/tools/testing/selftests/kmod/kmod.sh +++ b/tools/testing/selftests/kmod/kmod.sh @@ -64,6 +64,8 @@ ALL_TESTS="$ALL_TESTS 0009:150:1" ALL_TESTS="$ALL_TESTS 0010:1:1" ALL_TESTS="$ALL_TESTS 0011:1:1" +MODULE_NOT_FOUND="FAILURE" + # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 @@ -155,14 +157,19 @@ test_finish() echo "Test completed" } +# OLD_FAILURE is just because the old kernel umh never wrapped +# the error with WEXITSTATUS(). Now that it does it, we get the +# appropriate actual value from userspace observed in-kernel. + +# We keep the old mapping to ensure this script keeps working +# with older kernels. errno_name_to_val() { case "$1" in - # kmod calls modprobe and upon of a module not found - # modprobe returns just 1... However in the kernel we - # *sometimes* see 256... - MODULE_NOT_FOUND) + OLD_FAILURE) echo 256;; + FAILURE) + echo 1;; SUCCESS) echo 0;; -EPERM) @@ -181,7 +188,9 @@ errno_name_to_val() errno_val_to_name() case "$1" in 256) - echo MODULE_NOT_FOUND;; + echo OLD_FAILURE;; + 1) + echo FAILURE;; 0) echo SUCCESS;; -1) @@ -335,6 +344,28 @@ kmod_defaults_fs() config_set_test_case_fs } +check_umh() +{ + NAME='' + + kmod_defaults_driver + config_num_threads 1 + printf '\0' >"$DIR"/config_test_driver + config_trigger ${FUNCNAME[0]} + RC=$(config_get_test_result) + if [[ "$RC" == "256" ]]; then + MODULE_NOT_FOUND="OLD_FAILURE" + echo "check_umh: you have and old umh which didn't wrap errors" + echo " with WEXITSTATUS(). This is OK!" + elif [[ "$RC" != "1" ]]; then + echo "check_umh: Unexpected return value with no modprobe argument: $RC" + exit + else + echo "check_umh: You have a new umh which wraps erros with" + echo " WEXITSTATUS(). This is OK!" + fi +} + kmod_test_0001_driver() { NAME='\000' @@ -343,7 +374,7 @@ kmod_test_0001_driver() config_num_threads 1 printf $NAME >"$DIR"/config_test_driver config_trigger ${FUNCNAME[0]} - config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND + config_expect_result ${FUNCNAME[0]} $MODULE_NOT_FOUND } kmod_test_0001_fs() @@ -371,7 +402,7 @@ kmod_test_0002_driver() config_set_driver $NAME config_num_threads 1 config_trigger ${FUNCNAME[0]} - config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND + config_expect_result ${FUNCNAME[0]} $MODULE_NOT_FOUND } kmod_test_0002_fs() @@ -648,6 +679,7 @@ load_req_mod MODPROBE=$(