From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <ast@kernel.org>, <daniel@iogearbox.net>,
<martin.lau@kernel.org>
Cc: <andrii@kernel.org>, <kernel-team@meta.com>
Subject: [PATCH v2 bpf-next 10/10] selftests/bpf: add freplace of BTF-unreliable main prog test
Date: Tue, 12 Dec 2023 15:25:35 -0800 [thread overview]
Message-ID: <20231212232535.1875938-11-andrii@kernel.org> (raw)
In-Reply-To: <20231212232535.1875938-1-andrii@kernel.org>
Add a test validating that freplace'ing another main (entry) BPF program
fails if the target BPF program doesn't have valid/expected func proto BTF.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
.../selftests/bpf/prog_tests/fexit_bpf2bpf.c | 14 +++++++++++++
.../selftests/bpf/prog_tests/verifier.c | 2 ++
.../bpf/progs/freplace_unreliable_prog.c | 20 +++++++++++++++++++
.../bpf/progs/verifier_btf_unreliable_prog.c | 20 +++++++++++++++++++
4 files changed, 56 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/freplace_unreliable_prog.c
create mode 100644 tools/testing/selftests/bpf/progs/verifier_btf_unreliable_prog.c
diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
index 8ec73fdfcdab..39ce45337e7d 100644
--- a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
+++ b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
@@ -374,6 +374,9 @@ static void test_obj_load_failure_common(const char *obj_file,
err = bpf_program__set_attach_target(prog, pkt_fd, NULL);
ASSERT_OK(err, "set_attach_target");
+ if (env.verbosity > VERBOSE_NONE)
+ bpf_program__set_log_level(prog, 2);
+
/* It should fail to load the program */
err = bpf_object__load(obj);
if (CHECK(!err, "bpf_obj_load should fail", "err %d\n", err))
@@ -398,6 +401,15 @@ static void test_func_map_prog_compatibility(void)
"./test_attach_probe.bpf.o");
}
+static void test_func_replace_unreliable(void)
+{
+ /* freplace'ing unreliable main prog should fail with error
+ * "Cannot replace static functions"
+ */
+ test_obj_load_failure_common("freplace_unreliable_prog.bpf.o",
+ "./verifier_btf_unreliable_prog.bpf.o");
+}
+
static void test_func_replace_global_func(void)
{
const char *prog_name[] = {
@@ -563,6 +575,8 @@ void serial_test_fexit_bpf2bpf(void)
test_func_replace_return_code();
if (test__start_subtest("func_map_prog_compatibility"))
test_func_map_prog_compatibility();
+ if (test__start_subtest("func_replace_unreliable"))
+ test_func_replace_unreliable();
if (test__start_subtest("func_replace_multi"))
test_func_replace_multi();
if (test__start_subtest("fmod_ret_freplace"))
diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
index 8d746642cbd7..1174a303e075 100644
--- a/tools/testing/selftests/bpf/prog_tests/verifier.c
+++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
@@ -13,6 +13,7 @@
#include "verifier_bpf_get_stack.skel.h"
#include "verifier_bswap.skel.h"
#include "verifier_btf_ctx_access.skel.h"
+#include "verifier_btf_unreliable_prog.skel.h"
#include "verifier_cfg.skel.h"
#include "verifier_cgroup_inv_retcode.skel.h"
#include "verifier_cgroup_skb.skel.h"
@@ -123,6 +124,7 @@ void test_verifier_bounds_mix_sign_unsign(void) { RUN(verifier_bounds_mix_sign_u
void test_verifier_bpf_get_stack(void) { RUN(verifier_bpf_get_stack); }
void test_verifier_bswap(void) { RUN(verifier_bswap); }
void test_verifier_btf_ctx_access(void) { RUN(verifier_btf_ctx_access); }
+void test_verifier_btf_unreliable_prog(void) { RUN(verifier_btf_unreliable_prog); }
void test_verifier_cfg(void) { RUN(verifier_cfg); }
void test_verifier_cgroup_inv_retcode(void) { RUN(verifier_cgroup_inv_retcode); }
void test_verifier_cgroup_skb(void) { RUN(verifier_cgroup_skb); }
diff --git a/tools/testing/selftests/bpf/progs/freplace_unreliable_prog.c b/tools/testing/selftests/bpf/progs/freplace_unreliable_prog.c
new file mode 100644
index 000000000000..624078abf3de
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/freplace_unreliable_prog.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Facebook
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+SEC("freplace/btf_unreliable_kprobe")
+/* context type is what BPF verifier expects for kprobe context, but target
+ * program has `stuct whatever *ctx` argument, so freplace operation will be
+ * rejected with the following message:
+ *
+ * arg0 replace_btf_unreliable_kprobe(struct pt_regs *) doesn't match btf_unreliable_kprobe(struct whatever *)
+ */
+int replace_btf_unreliable_kprobe(bpf_user_pt_regs_t *ctx)
+{
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/verifier_btf_unreliable_prog.c b/tools/testing/selftests/bpf/progs/verifier_btf_unreliable_prog.c
new file mode 100644
index 000000000000..36e033a2e02c
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_btf_unreliable_prog.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Facebook
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+#include "bpf_misc.h"
+
+struct whatever {};
+
+SEC("kprobe")
+__success __log_level(2)
+/* context type is wrong, making it impossible to freplace this program */
+int btf_unreliable_kprobe(struct whatever *ctx)
+{
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.34.1
next prev parent reply other threads:[~2023-12-12 23:26 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 23:25 [PATCH v2 bpf-next 00/10] Enhance BPF global subprogs with argument tags Andrii Nakryiko
2023-12-12 23:25 ` [PATCH v2 bpf-next 01/10] bpf: abstract away global subprog arg preparation logic from reg state setup Andrii Nakryiko
2023-12-12 23:25 ` [PATCH v2 bpf-next 02/10] bpf: reuse btf_prepare_func_args() check for main program BTF validation Andrii Nakryiko
2023-12-13 17:43 ` Eduard Zingerman
2023-12-13 18:06 ` Andrii Nakryiko
2023-12-13 18:14 ` Eduard Zingerman
2023-12-13 18:23 ` Andrii Nakryiko
2023-12-13 18:29 ` Eduard Zingerman
2023-12-12 23:25 ` [PATCH v2 bpf-next 03/10] bpf: prepare btf_prepare_func_args() for handling static subprogs Andrii Nakryiko
2023-12-12 23:25 ` [PATCH v2 bpf-next 04/10] bpf: move subprog call logic back to verifier.c Andrii Nakryiko
2023-12-12 23:25 ` [PATCH v2 bpf-next 05/10] bpf: reuse subprog argument parsing logic for subprog call checks Andrii Nakryiko
2023-12-12 23:25 ` [PATCH v2 bpf-next 06/10] bpf: support 'arg:xxx' btf_decl_tag-based hints for global subprog args Andrii Nakryiko
2023-12-13 17:43 ` Eduard Zingerman
2023-12-13 19:18 ` Andrii Nakryiko
2023-12-13 19:33 ` Eduard Zingerman
2023-12-12 23:25 ` [PATCH v2 bpf-next 07/10] bpf: add support for passing dynptr pointer to global subprog Andrii Nakryiko
2023-12-13 17:43 ` Eduard Zingerman
2023-12-12 23:25 ` [PATCH v2 bpf-next 08/10] libbpf: add __arg_xxx macros for annotating global func args Andrii Nakryiko
2023-12-13 17:43 ` Eduard Zingerman
2023-12-12 23:25 ` [PATCH v2 bpf-next 09/10] selftests/bpf: add global subprog annotation tests Andrii Nakryiko
2023-12-12 23:25 ` Andrii Nakryiko [this message]
2023-12-13 17:44 ` [PATCH v2 bpf-next 10/10] selftests/bpf: add freplace of BTF-unreliable main prog test Eduard Zingerman
2023-12-13 19:25 ` Andrii Nakryiko
2023-12-13 20:39 ` Eduard Zingerman
2023-12-13 22:48 ` Andrii Nakryiko
2023-12-14 0:14 ` Eduard Zingerman
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