diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/refcounted_kptr_fail.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/refcounted_kptr_fail.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/refcounted_kptr_fail.c b/tools/testing/selftests/bpf/progs/refcounted_kptr_fail.c index 0b09e5c915b1..1ef07f6ee580 100644 --- a/tools/testing/selftests/bpf/progs/refcounted_kptr_fail.c +++ b/tools/testing/selftests/bpf/progs/refcounted_kptr_fail.c @@ -13,6 +13,9 @@ struct node_acquire { struct bpf_refcount refcount; }; +extern void bpf_rcu_read_lock(void) __ksym; +extern void bpf_rcu_read_unlock(void) __ksym; + #define private(name) SEC(".data." #name) __hidden __attribute__((aligned(8))) private(A) struct bpf_spin_lock glock; private(A) struct bpf_rb_root groot __contains(node_acquire, node); @@ -71,4 +74,29 @@ long rbtree_refcounted_node_ref_escapes_owning_input(void *ctx) return 0; } +SEC("?fentry.s/bpf_testmod_test_read") +__failure __msg("function calls are not allowed while holding a lock") +int BPF_PROG(rbtree_fail_sleepable_lock_across_rcu, + struct file *file, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len) +{ + struct node_acquire *n; + + n = bpf_obj_new(typeof(*n)); + if (!n) + return 0; + + /* spin_{lock,unlock} are in different RCU CS */ + bpf_rcu_read_lock(); + bpf_spin_lock(&glock); + bpf_rbtree_add(&groot, &n->node, less); + bpf_rcu_read_unlock(); + + bpf_rcu_read_lock(); + bpf_spin_unlock(&glock); + bpf_rcu_read_unlock(); + + return 0; +} + char _license[] SEC("license") = "GPL"; |