From 1ee076719d4e14c005f375c50731ed44eb48fee4 Mon Sep 17 00:00:00 2001 From: KP Singh Date: Thu, 3 Dec 2020 19:14:35 +0000 Subject: [PATCH] selftests/bpf: Ensure securityfs mount before writing ima policy SecurityFS may not be mounted even if it is enabled in the kernel config. So, check if the mount exists in /proc/mounts by parsing the file and, if not, mount it on /sys/kernel/security. Fixes: 34b82d3ac105 ("bpf: Add a selftest for bpf_ima_inode_hash") Reported-by: Andrii Nakryiko Signed-off-by: KP Singh Signed-off-by: Andrii Nakryiko Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20201203191437.666737-3-kpsingh@chromium.org --- tools/testing/selftests/bpf/ima_setup.sh | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/testing/selftests/bpf/ima_setup.sh b/tools/testing/selftests/bpf/ima_setup.sh index 137f2d32598f..b1ee4bf06996 100755 --- a/tools/testing/selftests/bpf/ima_setup.sh +++ b/tools/testing/selftests/bpf/ima_setup.sh @@ -14,6 +14,20 @@ usage() exit 1 } +ensure_mount_securityfs() +{ + local securityfs_dir=$(grep "securityfs" /proc/mounts | awk '{print $2}') + + if [ -z "${securityfs_dir}" ]; then + securityfs_dir=/sys/kernel/security + mount -t securityfs security "${securityfs_dir}" + fi + + if [ ! -d "${securityfs_dir}" ]; then + echo "${securityfs_dir}: securityfs is not mounted" && exit 1 + fi +} + setup() { local tmp_dir="$1" @@ -33,6 +47,7 @@ setup() cp "${TEST_BINARY}" "${mount_dir}" local mount_uuid="$(blkid ${loop_device} | sed 's/.*UUID="\([^"]*\)".*/\1/')" + ensure_mount_securityfs echo "measure func=BPRM_CHECK fsuuid=${mount_uuid}" > ${IMA_POLICY_FILE} }