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selftests/bpf: precision of a NULL global subprogram BTF_ID argument

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Check that mark_chain_precision() is called for a NULL pointer passed
as an __arg_trusted __arg_nullable argument of a global subprogram.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-8-0f5a360ff15d@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2026-09-04 17:05:59 -07:00 committed by Alexei Starovoitov
parent e726fc6b9a
commit 9195779166
1 changed files with 24 additions and 0 deletions
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24
tools/testing/selftests/bpf/progs/verifier_global_ptr_args.c
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@ -56,6 +56,30 @@ int trusted_task_arg_nullable(void *ctx)
return res;
}
/*
* Check that the verifier does not use checkpoints created
* on path with r1 == 0 to prune path with r1 != 0.
*/
SEC("?tp_btf/task_newtask")
__failure
__flag(BPF_F_TEST_STATE_FREQ)
__msg("R1 type=scalar expected=ptr_, trusted_ptr_, rcu_ptr_")
__naked int null_btf_id_arg_global_subprog(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"r1 = 42;"
"if r0 > 42 goto 1f;"
"r1 = 0;"
"1:"
"call subprog_trusted_task_nullable;"
"r0 = 0;"
"exit;"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
__weak int subprog_trusted_task_nonnull(struct task_struct *task __arg_trusted)
{
return task->pid + task->tgid;