diff mbox series

selftests/ftrace: Choose target function for filter test from samples

Message ID 167919441260.1922645.18355804179347364057.stgit@mhiramat.roam.corp.google.com (mailing list archive)
State Accepted
Commit eb50d0f250e96ede9192d936d220cd97adc93b89
Delegated to: Masami Hiramatsu
Headers show
Series selftests/ftrace: Choose target function for filter test from samples | expand

Commit Message

Masami Hiramatsu (Google) March 19, 2023, 2:53 a.m. UTC 
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Since the event-filter-function.tc expects the 'exit_mmap()' directly
calls 'kmem_cache_free()', this is vulnerable to code modifications.

Choose the target function for the filter test from the sample
event data so that it can keep test running correctly even if the caller
function name will be changed.

Link: https://lore.kernel.org/all/CA+G9fYtF-XEKi9YNGgR=Kf==7iRb2FrmEC7qtwAeQbfyah-UhA@mail.gmail.com/
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Fixes: 7f09d639b8c4 ("tracing/selftests: Add test for event filtering on function name")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
 .../ftrace/test.d/filter/event-filter-function.tc  |   45 ++++++++++++--------
 1 file changed, 27 insertions(+), 18 deletions(-)

Comments

Steven Rostedt March 20, 2023, 5:58 p.m. UTC | #1 
On Sun, 19 Mar 2023 11:53:32 +0900
"Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> 
> Since the event-filter-function.tc expects the 'exit_mmap()' directly
> calls 'kmem_cache_free()', this is vulnerable to code modifications.
> 
> Choose the target function for the filter test from the sample
> event data so that it can keep test running correctly even if the caller
> function name will be changed.
> 
> Link: https://lore.kernel.org/all/CA+G9fYtF-XEKi9YNGgR=Kf==7iRb2FrmEC7qtwAeQbfyah-UhA@mail.gmail.com/
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> Fixes: 7f09d639b8c4 ("tracing/selftests: Add test for event filtering on function name")
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>

-- Steve
diff mbox series

Patch

diff --git a/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc b/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
index e2ff3bf4df80..2de7c61d1ae3 100644
--- a/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
+++ b/tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
@@ -9,18 +9,33 @@  fail() { #msg
     exit_fail
 }
 
-echo "Test event filter function name"
+sample_events() {
+    echo > trace
+    echo 1 > events/kmem/kmem_cache_free/enable
+    echo 1 > tracing_on
+    ls > /dev/null
+    echo 0 > tracing_on
+    echo 0 > events/kmem/kmem_cache_free/enable
+}
+
 echo 0 > tracing_on
 echo 0 > events/enable
+
+echo "Get the most frequently calling function"
+sample_events
+
+target_func=`cut -d: -f3 trace | sed 's/call_site=\([^+]*\)+0x.*/\1/' | sort | uniq -c | sort | tail -n 1 | sed 's/^[ 0-9]*//'`
+if [ -z "$target_func" ]; then
+    exit_fail
+fi
 echo > trace
-echo 'call_site.function == exit_mmap' > events/kmem/kmem_cache_free/filter
-echo 1 > events/kmem/kmem_cache_free/enable
-echo 1 > tracing_on
-ls > /dev/null
-echo 0 > events/kmem/kmem_cache_free/enable
 
-hitcnt=`grep kmem_cache_free trace| grep exit_mmap | wc -l`
-misscnt=`grep kmem_cache_free trace| grep -v exit_mmap | wc -l`
+echo "Test event filter function name"
+echo "call_site.function == $target_func" > events/kmem/kmem_cache_free/filter
+sample_events
+
+hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
+misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
 
 if [ $hitcnt -eq 0 ]; then
 	exit_fail
@@ -30,20 +45,14 @@  if [ $misscnt -gt 0 ]; then
 	exit_fail
 fi
 
-address=`grep ' exit_mmap$' /proc/kallsyms | cut -d' ' -f1`
+address=`grep " ${target_func}\$" /proc/kallsyms | cut -d' ' -f1`
 
 echo "Test event filter function address"
-echo 0 > tracing_on
-echo 0 > events/enable
-echo > trace
 echo "call_site.function == 0x$address" > events/kmem/kmem_cache_free/filter
-echo 1 > events/kmem/kmem_cache_free/enable
-echo 1 > tracing_on
-sleep 1
-echo 0 > events/kmem/kmem_cache_free/enable
+sample_events
 
-hitcnt=`grep kmem_cache_free trace| grep exit_mmap | wc -l`
-misscnt=`grep kmem_cache_free trace| grep -v exit_mmap | wc -l`
+hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
+misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
 
 if [ $hitcnt -eq 0 ]; then
 	exit_fail