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Merge branch 'for-6.15/ftrace-test' into for-linus

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This commit is contained in:
Petr Mladek
2025-03-27 12:01:51 +01:00
parent 59481b8bd0 474eecc882
commit d11f0d172a
2 changed files with 83 additions and 0 deletions
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49
tools/testing/selftests/livepatch/functions.sh
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@@ -10,6 +10,7 @@ SYSFS_KERNEL_DIR="/sys/kernel"
SYSFS_KLP_DIR="$SYSFS_KERNEL_DIR/livepatch"
SYSFS_DEBUG_DIR="$SYSFS_KERNEL_DIR/debug"
SYSFS_KPROBES_DIR="$SYSFS_DEBUG_DIR/kprobes"
SYSFS_TRACING_DIR="$SYSFS_DEBUG_DIR/tracing"
# Kselftest framework requirement - SKIP code is 4
ksft_skip=4
@@ -62,6 +63,9 @@ function push_config() {
awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
FTRACE_ENABLED=$(sysctl --values kernel.ftrace_enabled)
KPROBE_ENABLED=$(cat "$SYSFS_KPROBES_DIR/enabled")
TRACING_ON=$(cat "$SYSFS_TRACING_DIR/tracing_on")
CURRENT_TRACER=$(cat "$SYSFS_TRACING_DIR/current_tracer")
FTRACE_FILTER=$(cat "$SYSFS_TRACING_DIR/set_ftrace_filter")
}
function pop_config() {
@@ -74,6 +78,17 @@ function pop_config() {
if [[ -n "$KPROBE_ENABLED" ]]; then
echo "$KPROBE_ENABLED" > "$SYSFS_KPROBES_DIR/enabled"
fi
if [[ -n "$TRACING_ON" ]]; then
echo "$TRACING_ON" > "$SYSFS_TRACING_DIR/tracing_on"
fi
if [[ -n "$CURRENT_TRACER" ]]; then
echo "$CURRENT_TRACER" > "$SYSFS_TRACING_DIR/current_tracer"
fi
if [[ -n "$FTRACE_FILTER" ]]; then
echo "$FTRACE_FILTER" \
| sed -e "/#### all functions enabled ####/d" \
> "$SYSFS_TRACING_DIR/set_ftrace_filter"
fi
}
function set_dynamic_debug() {
@@ -351,3 +366,37 @@ function check_sysfs_value() {
die "Unexpected value in $path: $expected_value vs. $value"
fi
}
# cleanup_tracing() - stop and clean up function tracing
function cleanup_tracing() {
echo 0 > "$SYSFS_TRACING_DIR/tracing_on"
echo "" > "$SYSFS_TRACING_DIR/set_ftrace_filter"
echo "nop" > "$SYSFS_TRACING_DIR/current_tracer"
echo "" > "$SYSFS_TRACING_DIR/trace"
}
# trace_function(function) - start tracing of a function
# function - to be traced function
function trace_function() {
local function="$1"; shift
cleanup_tracing
echo "function" > "$SYSFS_TRACING_DIR/current_tracer"
echo "$function" > "$SYSFS_TRACING_DIR/set_ftrace_filter"
echo 1 > "$SYSFS_TRACING_DIR/tracing_on"
}
# check_traced_functions(functions...) - check whether each function appeared in the trace log
# functions - list of functions to be checked
function check_traced_functions() {
local function
for function in "$@"; do
if ! grep -Fwq "$function" "$SYSFS_TRACING_DIR/trace" ; then
die "Function ($function) did not appear in the trace"
fi
done
cleanup_tracing
}

34
tools/testing/selftests/livepatch/test-ftrace.sh
View File

@@ -61,4 +61,38 @@ livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH"
# - verify livepatch can load
# - check if traces have a patched function
# - reset trace and unload livepatch
start_test "trace livepatched function and check that the live patch remains in effect"
FUNCTION_NAME="livepatch_cmdline_proc_show"
load_lp $MOD_LIVEPATCH
trace_function "$FUNCTION_NAME"
if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
log "livepatch: ok"
fi
check_traced_functions "$FUNCTION_NAME"
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition
livepatch: '$MOD_LIVEPATCH': starting patching transition
livepatch: '$MOD_LIVEPATCH': completing patching transition
livepatch: '$MOD_LIVEPATCH': patching complete
livepatch: ok
% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled
livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
livepatch: '$MOD_LIVEPATCH': starting unpatching transition
livepatch: '$MOD_LIVEPATCH': completing unpatching transition
livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH"
exit 0