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selftests: kmod: test disabling module autoloading

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Test that request_module() fails with -ENOENT when
/proc/sys/kernel/modprobe contains (a) a nonexistent path, and (b) an
empty path.

Case (b) is a regression test for the patch "kmod: make request_module()
return an error when autoloading is disabled".

Tested with 'kmod.sh -t 0010 && kmod.sh -t 0011', and also simply with
'kmod.sh' to run all kmod tests.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jeff Vander Stoep <jeffv@google.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: NeilBrown <neilb@suse.com>
Link: http://lkml.kernel.org/r/20200312202552.241885-5-ebiggers@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Biggers 2020-04-10 14:33:57 -07:00 committed by Linus Torvalds
parent 6d573a0752
commit 23756e551f
1 changed files with 30 additions and 0 deletions
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30
tools/testing/selftests/kmod/kmod.sh
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@ -61,6 +61,8 @@ ALL_TESTS="$ALL_TESTS 0006:10:1"
ALL_TESTS="$ALL_TESTS 0007:5:1"
ALL_TESTS="$ALL_TESTS 0008:150:1"
ALL_TESTS="$ALL_TESTS 0009:150:1"
ALL_TESTS="$ALL_TESTS 0010:1:1"
ALL_TESTS="$ALL_TESTS 0011:1:1"
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
@ -149,6 +151,7 @@ function load_req_mod()
test_finish()
{
echo "$MODPROBE" > /proc/sys/kernel/modprobe
echo "Test completed"
}
@ -443,6 +446,30 @@ kmod_test_0009()
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0010()
{
kmod_defaults_driver
config_num_threads 1
echo "/KMOD_TEST_NONEXISTENT" > /proc/sys/kernel/modprobe
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -ENOENT
echo "$MODPROBE" > /proc/sys/kernel/modprobe
}
kmod_test_0011()
{
kmod_defaults_driver
config_num_threads 1
# This causes the kernel to not even try executing modprobe. The error
# code is still -ENOENT like when modprobe doesn't exist, so we can't
# easily test for the exact difference. But this still is a useful test
# since there was a bug where request_module() returned 0 in this case.
echo > /proc/sys/kernel/modprobe
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -ENOENT
echo "$MODPROBE" > /proc/sys/kernel/modprobe
}
list_tests()
{
echo "Test ID list:"
@ -460,6 +487,8 @@ list_tests()
echo "0007 x $(get_test_count 0007) - multithreaded tests with default setup test request_module() and get_fs_type()"
echo "0008 x $(get_test_count 0008) - multithreaded - push kmod_concurrent over max_modprobes for request_module()"
echo "0009 x $(get_test_count 0009) - multithreaded - push kmod_concurrent over max_modprobes for get_fs_type()"
echo "0010 x $(get_test_count 0010) - test nonexistent modprobe path"
echo "0011 x $(get_test_count 0011) - test completely disabling module autoloading"
}
usage()
@ -616,6 +645,7 @@ test_reqs
allow_user_defaults
load_req_mod
MODPROBE=$(</proc/sys/kernel/modprobe)
trap "test_finish" EXIT
parse_args $@