selftests/bpf: Fix map_kptr test.

The compiler is optimizing out majority of unref_ptr read/writes, so the test
wasn't testing much. For example, one could delete '__kptr' tag from
'struct prog_test_ref_kfunc __kptr *unref_ptr;' and the test would still "pass".

Convert it to volatile stores. Confirmed by comparing bpf asm before/after.

Fixes: 2cbc469a6fc3 ("selftests/bpf: Add C tests for kptr")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20230214235051.22938-1-alexei.starovoitov@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

diff --git a/tools/testing/selftests/bpf/progs/map_kptr.c b/tools/testing/selftests/bpf/progs/map_kptr.c
index eb82178..228ec45 100644 (file)
--- a/tools/testing/selftests/bpf/progs/map_kptr.c
+++ b/tools/testing/selftests/bpf/progs/map_kptr.c
@@ -62,21 +62,23 @@ extern struct prog_test_ref_kfunc *
 bpf_kfunc_call_test_kptr_get(struct prog_test_ref_kfunc **p, int a, int b) __ksym;
 extern void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym;
 
+#define WRITE_ONCE(x, val) ((*(volatile typeof(x) *) &(x)) = (val))
+
 static void test_kptr_unref(struct map_value *v)
 {
        struct prog_test_ref_kfunc *p;
 
        p = v->unref_ptr;
        /* store untrusted_ptr_or_null_ */
-       v->unref_ptr = p;
+       WRITE_ONCE(v->unref_ptr, p);
        if (!p)
                return;
        if (p->a + p->b > 100)
                return;
        /* store untrusted_ptr_ */
-       v->unref_ptr = p;
+       WRITE_ONCE(v->unref_ptr, p);
        /* store NULL */
-       v->unref_ptr = NULL;
+       WRITE_ONCE(v->unref_ptr, NULL);
 }
 
 static void test_kptr_ref(struct map_value *v)
@@ -85,7 +87,7 @@ static void test_kptr_ref(struct map_value *v)
 
        p = v->ref_ptr;
        /* store ptr_or_null_ */
-       v->unref_ptr = p;
+       WRITE_ONCE(v->unref_ptr, p);
        if (!p)
                return;
        if (p->a + p->b > 100)
@@ -99,7 +101,7 @@ static void test_kptr_ref(struct map_value *v)
                return;
        }
        /* store ptr_ */
-       v->unref_ptr = p;
+       WRITE_ONCE(v->unref_ptr, p);
        bpf_kfunc_call_test_release(p);
 
        p = bpf_kfunc_call_test_acquire(&(unsigned long){0});