bpf: Disallow NULLable pointers for trusted kfuncs

KF_TRUSTED_ARGS kfuncs currently have a subtle and insidious bug in
validating pointers to scalars. Say that you have a kfunc like the
following, which takes an array as the first argument:

bool bpf_cpumask_empty(const struct cpumask *cpumask)
{
	return cpumask_empty(cpumask);
}

...
BTF_ID_FLAGS(func, bpf_cpumask_empty, KF_TRUSTED_ARGS)
...

If a BPF program were to invoke the kfunc with a NULL argument, it would
crash the kernel. The reason is that struct cpumask is defined as a
bitmap, which is itself defined as an array, and is accessed as a memory
address by bitmap operations. So when the verifier analyzes the
register, it interprets it as a pointer to a scalar struct, which is an
array of size 8. check_mem_reg() then sees that the register is NULL and
returns 0, and the kfunc crashes when it passes it down to the cpumask
wrappers.

To fix this, this patch adds a check for KF_ARG_PTR_TO_MEM which
verifies that the register doesn't contain a possibly-NULL pointer if
the kfunc is KF_TRUSTED_ARGS.

Signed-off-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20230125143816.721952-2-void@manifault.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c b/tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c
index 973f0c5af965..f3bb0e16e088 100644
--- a/tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c
+++ b/tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c
@@ -93,11 +93,11 @@ static struct {
 	const char *prog_name;
 	const char *expected_err_msg;
 } failure_tests[] = {
-	{"cgrp_kfunc_acquire_untrusted", "R1 must be referenced or trusted"},
+	{"cgrp_kfunc_acquire_untrusted", "Possibly NULL pointer passed to trusted arg0"},
 	{"cgrp_kfunc_acquire_fp", "arg#0 pointer type STRUCT cgroup must point"},
 	{"cgrp_kfunc_acquire_unsafe_kretprobe", "reg type unsupported for arg#0 function"},
 	{"cgrp_kfunc_acquire_trusted_walked", "R1 must be referenced or trusted"},
-	{"cgrp_kfunc_acquire_null", "arg#0 pointer type STRUCT cgroup must point"},
+	{"cgrp_kfunc_acquire_null", "Possibly NULL pointer passed to trusted arg0"},
 	{"cgrp_kfunc_acquire_unreleased", "Unreleased reference"},
 	{"cgrp_kfunc_get_non_kptr_param", "arg#0 expected pointer to map value"},
 	{"cgrp_kfunc_get_non_kptr_acquired", "arg#0 expected pointer to map value"},