From a7e75016a0753c24d6c995bc02501ae35368e333 Mon Sep 17 00:00:00 2001
From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date: Wed, 9 Feb 2022 12:33:24 +0530
Subject: selftests/bpf: Add test for bpf_timer overwriting crash
Add a test that validates that timer value is not overwritten when doing
a copy_map_value call in the kernel. Without the prior fix, this test
triggers a crash.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220209070324.1093182-3-memxor@gmail.com
---
.../testing/selftests/bpf/prog_tests/timer_crash.c | 32 ++++++++++++++++++++++
1 file changed, 32 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/timer_crash.c
(limited to 'tools/testing/selftests/bpf/prog_tests/timer_crash.c')
diff --git a/tools/testing/selftests/bpf/prog_tests/timer_crash.c b/tools/testing/selftests/bpf/prog_tests/timer_crash.c
new file mode 100644
index 000000000000..f74b82305da8
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/timer_crash.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "timer_crash.skel.h"
+
+enum {
+ MODE_ARRAY,
+ MODE_HASH,
+};
+
+static void test_timer_crash_mode(int mode)
+{
+ struct timer_crash *skel;
+
+ skel = timer_crash__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "timer_crash__open_and_load"))
+ return;
+ skel->bss->pid = getpid();
+ skel->bss->crash_map = mode;
+ if (!ASSERT_OK(timer_crash__attach(skel), "timer_crash__attach"))
+ goto end;
+ usleep(1);
+end:
+ timer_crash__destroy(skel);
+}
+
+void test_timer_crash(void)
+{
+ if (test__start_subtest("array"))
+ test_timer_crash_mode(MODE_ARRAY);
+ if (test__start_subtest("hash"))
+ test_timer_crash_mode(MODE_HASH);
+}
--
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