diff mbox series

[bpf-next,v6,04/23] selftests/bpf: add test for accessing ctx from syscall program type

Message ID 20220712145850.599666-5-benjamin.tissoires@redhat.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Introduce eBPF support for HID devices | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR fail PR summary
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 29 this patch: 29
netdev/cc_maintainers warning 12 maintainers not CCed: haoluo@google.com delyank@fb.com mykolal@fb.com song@kernel.org edumazet@google.com memxor@gmail.com pabeni@redhat.com kuba@kernel.org martin.lau@linux.dev davem@davemloft.net jolsa@kernel.org sdf@google.com
netdev/build_clang success Errors and warnings before: 6 this patch: 6
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 29 this patch: 29
netdev/checkpatch warning CHECK: Alignment should match open parenthesis WARNING: line length of 96 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-VM_Test-1 fail Logs for Kernel LATEST on ubuntu-latest with gcc
bpf/vmtest-bpf-next-VM_Test-2 fail Logs for Kernel LATEST on ubuntu-latest with llvm-15
bpf/vmtest-bpf-next-VM_Test-3 fail Logs for Kernel LATEST on z15 with gcc

Commit Message

Benjamin Tissoires July 12, 2022, 2:58 p.m. UTC 
We need to also export the kfunc set to the syscall program type,
and then add a couple of eBPF programs that are testing those calls.

The first one checks for valid access, and the second one is OK
from a static analysis point of view but fails at run time because
we are trying to access outside of the allocated memory.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

---

new in v6
---
 net/bpf/test_run.c                            |  1 +
 .../selftests/bpf/prog_tests/kfunc_call.c     | 20 ++++++++++++++
 .../selftests/bpf/progs/kfunc_call_test.c     | 27 +++++++++++++++++++
 3 files changed, 48 insertions(+)

Comments

Yonghong Song July 16, 2022, 12:17 a.m. UTC | #1 
On 7/12/22 7:58 AM, Benjamin Tissoires wrote:
> We need to also export the kfunc set to the syscall program type,
> and then add a couple of eBPF programs that are testing those calls.
> 
> The first one checks for valid access, and the second one is OK
> from a static analysis point of view but fails at run time because
> we are trying to access outside of the allocated memory.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

Acked-by: Yonghong Song <yhs@fb.com>
diff mbox series

Patch

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 2ca96acbc50a..9da2a42811e8 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -1646,6 +1646,7 @@  static int __init bpf_prog_test_run_init(void)
 	int ret;
 
 	ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
+	ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set);
 	return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,
 						  ARRAY_SIZE(bpf_prog_test_dtor_kfunc),
 						  THIS_MODULE);
diff --git a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
index c00eb974eb85..22547aafdd60 100644
--- a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
+++ b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
@@ -6,10 +6,22 @@ 
 #include "kfunc_call_test_subprog.skel.h"
 #include "kfunc_call_test_subprog.lskel.h"
 
+struct syscall_test_args {
+	__u8 data[16];
+	size_t size;
+};
+
 static void test_main(void)
 {
 	struct kfunc_call_test_lskel *skel;
 	int prog_fd, err;
+	struct syscall_test_args args = {
+		.size = 10,
+	};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, syscall_topts,
+		.ctx_in = &args,
+		.ctx_size_in = sizeof(args),
+	);
 	LIBBPF_OPTS(bpf_test_run_opts, topts,
 		.data_in = &pkt_v4,
 		.data_size_in = sizeof(pkt_v4),
@@ -35,6 +47,14 @@  static void test_main(void)
 	ASSERT_OK(err, "bpf_prog_test_run(test_ref_btf_id)");
 	ASSERT_EQ(topts.retval, 0, "test_ref_btf_id-retval");
 
+	prog_fd = skel->progs.kfunc_syscall_test.prog_fd;
+	err = bpf_prog_test_run_opts(prog_fd, &syscall_topts);
+	ASSERT_OK(err, "bpf_prog_test_run(syscall_test)");
+
+	prog_fd = skel->progs.kfunc_syscall_test_fail.prog_fd;
+	err = bpf_prog_test_run_opts(prog_fd, &syscall_topts);
+	ASSERT_ERR(err, "bpf_prog_test_run(syscall_test_fail)");
+
 	kfunc_call_test_lskel__destroy(skel);
 }
 
diff --git a/tools/testing/selftests/bpf/progs/kfunc_call_test.c b/tools/testing/selftests/bpf/progs/kfunc_call_test.c
index 5aecbb9fdc68..0978834e22ad 100644
--- a/tools/testing/selftests/bpf/progs/kfunc_call_test.c
+++ b/tools/testing/selftests/bpf/progs/kfunc_call_test.c
@@ -92,4 +92,31 @@  int kfunc_call_test_pass(struct __sk_buff *skb)
 	return 0;
 }
 
+struct syscall_test_args {
+	__u8 data[16];
+	size_t size;
+};
+
+SEC("syscall")
+int kfunc_syscall_test(struct syscall_test_args *args)
+{
+	const int size = args->size;
+
+	if (size > sizeof(args->data))
+		return -7; /* -E2BIG */
+
+	bpf_kfunc_call_test_mem_len_pass1(&args->data, sizeof(args->data));
+	bpf_kfunc_call_test_mem_len_pass1(&args->data, size);
+
+	return 0;
+}
+
+SEC("syscall")
+int kfunc_syscall_test_fail(struct syscall_test_args *args)
+{
+	bpf_kfunc_call_test_mem_len_pass1(&args->data, sizeof(*args) + 1);
+
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";