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selftests: livepatch: save and restore kprobe state

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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@suse.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Joe Lawrence <joe.lawrence@redhat.com>
Tested-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20241017200132.21946-3-mvetter@suse.com
[pmladek@suse.com: Added few more substitutions in test-syscall.sh]
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Michael Vetter 2024-10-17 22:01:31 +02:00 committed by Petr Mladek
parent 637c730998
commit 59766286b6
2 changed files with 13 additions and 6 deletions
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15
tools/testing/selftests/livepatch/functions.sh
View File

@ -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

4
tools/testing/selftests/livepatch/test-syscall.sh
View File

@ -27,9 +27,9 @@ pid_list=$(echo ${pids[@]} | tr ' ' ',')
load_lp $MOD_SYSCALL klp_pids=$pid_list
# wait for all tasks to transition to patched state
loop_until 'grep -q '^0$' /sys/kernel/test_klp_syscall/npids'
loop_until 'grep -q '^0$' $SYSFS_KERNEL_DIR/$MOD_SYSCALL/npids'
pending_pids=$(cat /sys/kernel/test_klp_syscall/npids)
pending_pids=$(cat $SYSFS_KERNEL_DIR/$MOD_SYSCALL/npids)
log "$MOD_SYSCALL: Remaining not livepatched processes: $pending_pids"
for pid in ${pids[@]}; do