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selftests: kmod: Add module address visibility test

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Make sure we don't regress the CAP_SYSLOG behavior of the module address
visibility via /proc/modules nor /sys/module/*/sections/*.

Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Kees Cook 2020-07-03 11:43:28 -07:00 committed by Shuah Khan
parent 541f5643d3
commit a80d6055b3
1 changed files with 36 additions and 0 deletions
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36
tools/testing/selftests/kmod/kmod.sh
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@ -63,6 +63,8 @@ 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"
ALL_TESTS="$ALL_TESTS 0012:1:1"
ALL_TESTS="$ALL_TESTS 0013:1:1"
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
@ -470,6 +472,38 @@ kmod_test_0011()
echo "$MODPROBE" > /proc/sys/kernel/modprobe
}
kmod_check_visibility()
{
local name="$1"
local cmd="$2"
modprobe $DEFAULT_KMOD_DRIVER
local priv=$(eval $cmd)
local unpriv=$(capsh --drop=CAP_SYSLOG -- -c "$cmd")
if [ "$priv" = "$unpriv" ] || \
[ "${priv:0:3}" = "0x0" ] || \
[ "${unpriv:0:3}" != "0x0" ] ; then
echo "${FUNCNAME[0]}: FAIL, $name visible to unpriv: '$priv' vs '$unpriv'" >&2
exit 1
else
echo "${FUNCNAME[0]}: OK!"
fi
}
kmod_test_0012()
{
kmod_check_visibility /proc/modules \
"grep '^${DEFAULT_KMOD_DRIVER}\b' /proc/modules | awk '{print \$NF}'"
}
kmod_test_0013()
{
kmod_check_visibility '/sys/module/*/sections/*' \
"cat /sys/module/${DEFAULT_KMOD_DRIVER}/sections/.*text | head -n1"
}
list_tests()
{
echo "Test ID list:"
@ -489,6 +523,8 @@ list_tests()
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"
echo "0012 x $(get_test_count 0012) - test /proc/modules address visibility under CAP_SYSLOG"
echo "0013 x $(get_test_count 0013) - test /sys/module/*/sections/* visibility under CAP_SYSLOG"
}
usage()