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selftests/bpf: Validate multiple ref release_on_unlock logic 

Modify list_push_pop_multiple to alloc and insert nodes 2-at-a-time.
Without the previous patch's fix, this block of code:

  bpf_spin_lock(lock);
  bpf_list_push_front(head, &f[i]->node);
  bpf_list_push_front(head, &f[i + 1]->node);
  bpf_spin_unlock(lock);

would fail check_reference_leak check as release_on_unlock logic would miss
a ref that should've been released.

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
cc: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221201183406.1203621-2-davemarchevsky@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Dave Marchevsky 2022-12-01 10:34:06 -08:00 committed by Alexei Starovoitov
parent 1f82dffc10
commit 78b037bd40
1 changed files with 16 additions and 1 deletions
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17
tools/testing/selftests/bpf/progs/linked_list.c
View File

@ -99,13 +99,28 @@ int list_push_pop_multiple(struct bpf_spin_lock *lock, struct bpf_list_head *hea
struct foo *f[8], *pf;
int i;
for (i = 0; i < ARRAY_SIZE(f); i++) {
/* Loop following this check adds nodes 2-at-a-time in order to
* validate multiple release_on_unlock release logic
*/
if (ARRAY_SIZE(f) % 2)
return 10;
for (i = 0; i < ARRAY_SIZE(f); i += 2) {
f[i] = bpf_obj_new(typeof(**f));
if (!f[i])
return 2;
f[i]->data = i;
f[i + 1] = bpf_obj_new(typeof(**f));
if (!f[i + 1]) {
bpf_obj_drop(f[i]);
return 9;
}
f[i + 1]->data = i + 1;
bpf_spin_lock(lock);
bpf_list_push_front(head, &f[i]->node);
bpf_list_push_front(head, &f[i + 1]->node);
bpf_spin_unlock(lock);
}