Save the state of /sys/kernel/debug/kprobes/enabled
during setup_config() and restore it during cleanup().
This is in preparation for a future commit that will add a test
that should confirm that we cannot livepatch a kprobed function
if that kprobe has a post handler.
Signed-off-by: Michael Vetter <mvetter@xxxxxxxx>
---
tools/testing/selftests/livepatch/functions.sh | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
index 50361fceff06..91102562db58 100644
--- a/tools/testing/selftests/livepatch/functions.sh
+++ b/tools/testing/selftests/livepatch/functions.sh
@@ -6,7 +6,10 @@
MAX_RETRIES=600
RETRY_INTERVAL=".1" # seconds
-SYSFS_KLP_DIR="/sys/kernel/livepatch"
+SYSFS_KERNEL_DIR="/sys/kernel"
+SYSFS_KLP_DIR="$SYSFS_KERNEL_DIR/livepatch"
+SYSFS_DEBUG_DIR="$SYSFS_KERNEL_DIR/debug"
+SYSFS_KPROBES_DIR="$SYSFS_DEBUG_DIR/kprobes"
# Kselftest framework requirement - SKIP code is 4
ksft_skip=4
@@ -55,22 +58,26 @@ function die() {
}
function push_config() {
- DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
+ DYNAMIC_DEBUG=$(grep '^kernel/livepatch' "$SYSFS_DEBUG_DIR/dynamic_debug/control" | \
awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
FTRACE_ENABLED=$(sysctl --values kernel.ftrace_enabled)
+ KPROBE_ENABLED=$(cat "$SYSFS_KPROBES_DIR/enabled")
}
function pop_config() {
if [[ -n "$DYNAMIC_DEBUG" ]]; then
- echo -n "$DYNAMIC_DEBUG" > /sys/kernel/debug/dynamic_debug/control
+ echo -n "$DYNAMIC_DEBUG" > "$SYSFS_DEBUG_DIR/dynamic_debug/control"
fi
if [[ -n "$FTRACE_ENABLED" ]]; then
sysctl kernel.ftrace_enabled="$FTRACE_ENABLED" &> /dev/null
fi
+ if [[ -n "$KPROBE_ENABLED" ]]; then
+ echo "$KPROBE_ENABLED" > "$SYSFS_KPROBES_DIR/enabled"
+ fi
}
function set_dynamic_debug() {
- cat <<-EOF > /sys/kernel/debug/dynamic_debug/control
+ cat <<-EOF > "$SYSFS_DEBUG_DIR/dynamic_debug/control"
file kernel/livepatch/* +p
func klp_try_switch_task -p
EOF
--
2.46.1
