selftests/bpf: Add assert for user stacks in test_task_stack

This is a follow up to:
commit b8e3a87a627b ("bpf: Add crosstask check to __bpf_get_stack").

This test ensures that the task iterator only gets a single
user stack (for the current task).

Signed-off-by: Jordan Rome <linux@jordanrome.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20231112023010.144675-1-linux@jordanrome.com

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index 4e02093c2cbef4afae709191fbf9fdea3403ef71..618af9dfae9b746e283edb122d94b0a817411b80 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -332,6 +332,8 @@ static void test_task_stack(void)
        do_dummy_read(skel->progs.dump_task_stack);
        do_dummy_read(skel->progs.get_task_user_stacks);
 
+       ASSERT_EQ(skel->bss->num_user_stacks, 1, "num_user_stacks");
+
        bpf_iter_task_stack__destroy(skel);
 }
 

diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c b/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
index f2b8167b72a84ece6c03402f527c6e68591712da..442f4ca39fd761d823aa58953afd9cb4a69fde2f 100644 (file)
--- a/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
@@ -35,6 +35,8 @@ int dump_task_stack(struct bpf_iter__task *ctx)
        return 0;
 }
 
+int num_user_stacks = 0;
+
 SEC("iter/task")
 int get_task_user_stacks(struct bpf_iter__task *ctx)
 {
@@ -51,6 +53,9 @@ int get_task_user_stacks(struct bpf_iter__task *ctx)
        if (res <= 0)
                return 0;
 
+       /* Only one task, the current one, should succeed */
+       ++num_user_stacks;
+
        buf_sz += res;
 
        /* If the verifier doesn't refine bpf_get_task_stack res, and instead