[PATCH bpf-next v2 09/31] selftests/bpf: Fix verify_pkcs7_sig on s390x

Ilya Leoshkevich
2023-01-28T00:07:39Z

Use bpf_probe_read_kernel() instead of bpf_probe_read(), which is not
defined on all architectures.

While at it, improve the error handling: do not hide the verifier log,
and check the return values of bpf_probe_read_kernel() and
bpf_copy_from_user().

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
.../selftests/bpf/prog_tests/verify_pkcs7_sig.c | 3 +++
.../selftests/bpf/progs/test_verify_pkcs7_sig.c | 12 ++++++++----
2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/verify_pkcs7_sig.c b/tools/testing/selftests/bpf/prog_tests/verify_pkcs7_sig.c
index 579d6ee83ce0..dd7f2bc70048 100644
--- a/tools/testing/selftests/bpf/prog_tests/verify_pkcs7_sig.c
+++ b/tools/testing/selftests/bpf/prog_tests/verify_pkcs7_sig.c
@@ -61,6 +61,9 @@ static bool kfunc_not_supported;
static int libbpf_print_cb(enum libbpf_print_level level, const char *fmt,
va_list args)
{
+ if (level == LIBBPF_WARN)
+ vprintf(fmt, args);
+
if (strcmp(fmt, "libbpf: extern (func ksym) '%s': not found in kernel or module BTFs\n"))
return 0;

diff --git a/tools/testing/selftests/bpf/progs/test_verify_pkcs7_sig.c b/tools/testing/selftests/bpf/progs/test_verify_pkcs7_sig.c
index ce419304ff1f..7748cc23de8a 100644
--- a/tools/testing/selftests/bpf/progs/test_verify_pkcs7_sig.c
+++ b/tools/testing/selftests/bpf/progs/test_verify_pkcs7_sig.c
@@ -59,10 +59,14 @@ int BPF_PROG(bpf, int cmd, union bpf_attr *attr, unsigned int size)
if (!data_val)
return 0;

- bpf_probe_read(&value, sizeof(value), &attr->value);
-
- bpf_copy_from_user(data_val, sizeof(struct data),
- (void *)(unsigned long)value);
+ ret = bpf_probe_read_kernel(&value, sizeof(value), &attr->value);
+ if (ret)
+ return ret;
+
+ ret = bpf_copy_from_user(data_val, sizeof(struct data),
+ (void *)(unsigned long)value);
+ if (ret)
+ return ret;

if (data_val->data_len > sizeof(data_val->data))
return -EINVAL;
--
2.39.1