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selftests: bpf: Add tests for unbalanced rcu_read_lock

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As verifier now supports nested rcu critical sections, add new test
cases to make sure unbalanced usage of rcu_read_lock()/unlock() is
rejected.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20251117200411.25563-3-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Puranjay Mohan 2025-11-17 20:04:10 +00:00 committed by Alexei Starovoitov
parent 4167096cb9
commit cf49ec5705
2 changed files with 42 additions and 0 deletions
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2
tools/testing/selftests/bpf/prog_tests/rcu_read_lock.c
View File

@ -79,6 +79,8 @@ static const char * const inproper_region_tests[] = {
"non_sleepable_rcu_mismatch",
"inproper_sleepable_helper",
"inproper_sleepable_kfunc",
"nested_rcu_region_unbalanced_1",
"nested_rcu_region_unbalanced_2",
"rcu_read_lock_global_subprog_lock",
"rcu_read_lock_global_subprog_unlock",
"rcu_read_lock_sleepable_helper_global_subprog",

40
tools/testing/selftests/bpf/progs/rcu_read_lock.c
View File

@ -278,6 +278,46 @@ int nested_rcu_region(void *ctx)
return 0;
}
SEC("?fentry.s/" SYS_PREFIX "sys_nanosleep")
int nested_rcu_region_unbalanced_1(void *ctx)
{
struct task_struct *task, *real_parent;
/* nested rcu read lock regions */
task = bpf_get_current_task_btf();
bpf_rcu_read_lock();
bpf_rcu_read_lock();
real_parent = task->real_parent;
if (!real_parent)
goto out;
(void)bpf_task_storage_get(&map_a, real_parent, 0, 0);
out:
bpf_rcu_read_unlock();
bpf_rcu_read_unlock();
bpf_rcu_read_unlock();
return 0;
}
SEC("?fentry.s/" SYS_PREFIX "sys_nanosleep")
int nested_rcu_region_unbalanced_2(void *ctx)
{
struct task_struct *task, *real_parent;
/* nested rcu read lock regions */
task = bpf_get_current_task_btf();
bpf_rcu_read_lock();
bpf_rcu_read_lock();
bpf_rcu_read_lock();
real_parent = task->real_parent;
if (!real_parent)
goto out;
(void)bpf_task_storage_get(&map_a, real_parent, 0, 0);
out:
bpf_rcu_read_unlock();
bpf_rcu_read_unlock();
return 0;
}
SEC("?fentry.s/" SYS_PREFIX "sys_getpgid")
int task_trusted_non_rcuptr(void *ctx)
{