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authorKP Singh <kpsingh@google.com>2020-03-04 20:18:53 +0100
committerAlexei Starovoitov <ast@kernel.org>2020-03-04 13:41:06 -0800
commit3d08b6f29cf33aeaf301553d8d3805f0aa609df7 (patch)
tree7e9836d1926fce0e65362a47474fed446ea75f8c /net/bpf
parentda00d2f117a08fbca262db5ea422c80a568b112b (diff)
bpf: Add selftests for BPF_MODIFY_RETURN
Test for two scenarios: * When the fmod_ret program returns 0, the original function should be called along with fentry and fexit programs. * When the fmod_ret program returns a non-zero value, the original function should not be called, no side effect should be observed and fentry and fexit programs should be called. The result from the kernel function call and whether a side-effect is observed is returned via the retval attr of the BPF_PROG_TEST_RUN (bpf) syscall. Signed-off-by: KP Singh <kpsingh@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200304191853.1529-8-kpsingh@chromium.org
Diffstat (limited to 'net/bpf')
-rw-r--r--net/bpf/test_run.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 3600f098e7c6..4c921f5154e0 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -10,6 +10,7 @@
#include <net/bpf_sk_storage.h>
#include <net/sock.h>
#include <net/tcp.h>
+#include <linux/error-injection.h>
#define CREATE_TRACE_POINTS
#include <trace/events/bpf_test_run.h>
@@ -143,6 +144,14 @@ int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
return a + (long)b + c + d + (long)e + f;
}
+int noinline bpf_modify_return_test(int a, int *b)
+{
+ *b += 1;
+ return a + *b;
+}
+
+ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);
+
static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
u32 headroom, u32 tailroom)
{
@@ -168,7 +177,9 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog,
const union bpf_attr *kattr,
union bpf_attr __user *uattr)
{
- int err = -EFAULT;
+ u16 side_effect = 0, ret = 0;
+ int b = 2, err = -EFAULT;
+ u32 retval = 0;
switch (prog->expected_attach_type) {
case BPF_TRACE_FENTRY:
@@ -181,10 +192,19 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog,
bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111)
goto out;
break;
+ case BPF_MODIFY_RETURN:
+ ret = bpf_modify_return_test(1, &b);
+ if (b != 2)
+ side_effect = 1;
+ break;
default:
goto out;
}
+ retval = ((u32)side_effect << 16) | ret;
+ if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
+ goto out;
+
err = 0;
out:
trace_bpf_test_finish(&err);