Add tests validating that kernel handles pointer to anonymous struct
argument as PTR_TO_MEM case, not as PTR_TO_CTX case.
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
.../bpf/progs/verifier_global_subprogs.c | 29 +++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c b/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
index 67dddd941891..baff5ffe9405 100644
--- a/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
+++ b/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
@@ -115,6 +115,35 @@ int arg_tag_nullable_ptr_fail(void *ctx)
return subprog_nullable_ptr_bad(&x);
}
+typedef struct {
+ int x;
+} user_struct_t;
+
+__noinline __weak int subprog_user_anon_mem(user_struct_t *t)
+{
+ return t ? t->x : 0;
+}
+
+SEC("?tracepoint")
+__failure __log_level(2)
+__msg("invalid bpf_context access")
+__msg("Caller passes invalid args into func#1 ('subprog_user_anon_mem')")
+int anon_user_mem_invalid(void *ctx)
+{
+ /* can't pass PTR_TO_CTX as user memory */
+ return subprog_user_anon_mem(ctx);
+}
+
+SEC("?tracepoint")
+__success __log_level(2)
+__msg("Func#1 ('subprog_user_anon_mem') is safe for any args that match its prototype")
+int anon_user_mem_valid(void *ctx)
+{
+ user_struct_t t = { .x = 42 };
+
+ return subprog_user_anon_mem(&t);
+}
+
__noinline __weak int subprog_nonnull_ptr_good(int *p1 __arg_nonnull, int *p2 __arg_nonnull)
{
return (*p1) * (*p2); /* good, no need for NULL checks */
--
2.39.3
