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Message-Id: <20240510192412.3297104-9-amery.hung@bytedance.com>
Date: Fri, 10 May 2024 19:24:00 +0000
From: Amery Hung <ameryhung@...il.com>
To: netdev@...r.kernel.org
Cc: bpf@...r.kernel.org,
yangpeihao@...u.edu.cn,
daniel@...earbox.net,
andrii@...nel.org,
martin.lau@...nel.org,
sinquersw@...il.com,
toke@...hat.com,
jhs@...atatu.com,
jiri@...nulli.us,
sdf@...gle.com,
xiyou.wangcong@...il.com,
yepeilin.cs@...il.com,
ameryhung@...il.com
Subject: [RFC PATCH v8 08/20] selftests/bpf: Test adding kernel object to bpf graph
This patch tests bpf graphs storing kernel objects.
Signed-off-by: Amery Hung <amery.hung@...edance.com>
---
.../selftests/bpf/bpf_testmod/bpf_testmod.c | 14 +++++++++
.../selftests/bpf/bpf_testmod/bpf_testmod.h | 5 ++++
.../selftests/bpf/prog_tests/linked_list.c | 6 ++--
.../testing/selftests/bpf/progs/linked_list.c | 15 ++++++++++
.../testing/selftests/bpf/progs/linked_list.h | 8 +++++
.../selftests/bpf/progs/linked_list_fail.c | 29 +++++++++++++++++++
6 files changed, 75 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
index 097a8d1c2ef8..90dda6335c04 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
@@ -494,6 +494,18 @@ __bpf_kfunc static u32 bpf_kfunc_call_test_static_unused_arg(u32 arg, u32 unused
return arg;
}
+__bpf_kfunc static struct bpf_testmod_linked_list_obj *
+bpf_kfunc_call_test_acq_linked_list_obj(void)
+{
+ return kzalloc(sizeof(struct bpf_testmod_linked_list_obj), GFP_ATOMIC);
+}
+
+__bpf_kfunc static void
+bpf_kfunc_call_test_rel_linked_list_obj(struct bpf_testmod_linked_list_obj *obj)
+{
+ kvfree(obj);
+}
+
BTF_KFUNCS_START(bpf_testmod_check_kfunc_ids)
BTF_ID_FLAGS(func, bpf_testmod_test_mod_kfunc)
BTF_ID_FLAGS(func, bpf_kfunc_call_test1)
@@ -520,6 +532,8 @@ BTF_ID_FLAGS(func, bpf_kfunc_call_test_ref, KF_TRUSTED_ARGS | KF_RCU)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_destructive, KF_DESTRUCTIVE)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_static_unused_arg)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_offset)
+BTF_ID_FLAGS(func, bpf_kfunc_call_test_acq_linked_list_obj, KF_ACQUIRE | KF_RET_NULL)
+BTF_ID_FLAGS(func, bpf_kfunc_call_test_rel_linked_list_obj, KF_RELEASE)
BTF_KFUNCS_END(bpf_testmod_check_kfunc_ids)
static int bpf_testmod_ops_init(struct btf *btf)
diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.h b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.h
index 6d24e1307b64..77c36fc016e3 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.h
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.h
@@ -99,4 +99,9 @@ struct bpf_testmod_ops2 {
int (*test_1)(void);
};
+struct bpf_testmod_linked_list_obj {
+ int val;
+ struct bpf_list_node node;
+};
+
#endif /* _BPF_TESTMOD_H */
diff --git a/tools/testing/selftests/bpf/prog_tests/linked_list.c b/tools/testing/selftests/bpf/prog_tests/linked_list.c
index 2fb89de63bd2..813c2e9a2346 100644
--- a/tools/testing/selftests/bpf/prog_tests/linked_list.c
+++ b/tools/testing/selftests/bpf/prog_tests/linked_list.c
@@ -80,8 +80,8 @@ static struct {
{ "direct_write_node", "direct access to bpf_list_node is disallowed" },
{ "use_after_unlock_push_front", "invalid mem access 'scalar'" },
{ "use_after_unlock_push_back", "invalid mem access 'scalar'" },
- { "double_push_front", "arg#1 expected pointer to allocated object" },
- { "double_push_back", "arg#1 expected pointer to allocated object" },
+ { "double_push_front", "arg#1 expected pointer to allocated object or trusted pointer" },
+ { "double_push_back", "arg#1 expected pointer to allocated object or trusted pointer" },
{ "no_node_value_type", "bpf_list_node not found at offset=0" },
{ "incorrect_value_type",
"operation on bpf_list_head expects arg#1 bpf_list_node at offset=48 in struct foo, "
@@ -96,6 +96,8 @@ static struct {
{ "incorrect_head_off2", "bpf_list_head not found at offset=1" },
{ "pop_front_off", "off 48 doesn't point to 'struct bpf_spin_lock' that is at 40" },
{ "pop_back_off", "off 48 doesn't point to 'struct bpf_spin_lock' that is at 40" },
+ { "direct_write_node_kernel", "" },
+ { "push_local_node_to_kptr_list", "operation on bpf_list_head expects arg#1 bpf_list_node at offset=8 in struct bpf_testmod_linked_list_obj, but arg is at offset=8 in struct bpf_testmod_linked_list_obj" },
};
static void test_linked_list_fail_prog(const char *prog_name, const char *err_msg)
diff --git a/tools/testing/selftests/bpf/progs/linked_list.c b/tools/testing/selftests/bpf/progs/linked_list.c
index 26205ca80679..148ec67feaf7 100644
--- a/tools/testing/selftests/bpf/progs/linked_list.c
+++ b/tools/testing/selftests/bpf/progs/linked_list.c
@@ -378,4 +378,19 @@ int global_list_in_list(void *ctx)
return test_list_in_list(&glock, &ghead);
}
+SEC("tc")
+int push_to_kptr_list(void *ctx)
+{
+ struct bpf_testmod_linked_list_obj *f;
+
+ f = bpf_kfunc_call_test_acq_linked_list_obj();
+ if (!f)
+ return 0;
+
+ bpf_spin_lock(&glock3);
+ bpf_list_push_back(&ghead3, &f->node);
+ bpf_spin_unlock(&glock3);
+ return 0;
+}
+
char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/linked_list.h b/tools/testing/selftests/bpf/progs/linked_list.h
index c0f3609a7ffa..14bd92cfdb6f 100644
--- a/tools/testing/selftests/bpf/progs/linked_list.h
+++ b/tools/testing/selftests/bpf/progs/linked_list.h
@@ -5,6 +5,7 @@
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include "bpf_experimental.h"
+#include "../bpf_testmod/bpf_testmod.h"
struct bar {
struct bpf_list_node node;
@@ -52,5 +53,12 @@ struct {
private(A) struct bpf_spin_lock glock;
private(A) struct bpf_list_head ghead __contains(foo, node2);
private(B) struct bpf_spin_lock glock2;
+private(C) struct bpf_spin_lock glock3;
+private(C) struct bpf_list_head ghead3 __contains_kptr(bpf_testmod_linked_list_obj, node);
+
+struct bpf_testmod_linked_list_obj *bpf_kfunc_call_test_acq_linked_list_obj(void) __ksym;
+void bpf_kfunc_call_test_rel_linked_list_obj(struct bpf_testmod_linked_list_obj *obj) __ksym;
+struct bpf_testmod_rb_tree_obj *bpf_kfunc_call_test_acq_rb_tree_obj(void) __ksym;
+void bpf_kfunc_call_test_rel_rb_tree_obj(struct bpf_testmod_rb_tree_obj *obj) __ksym;
#endif
diff --git a/tools/testing/selftests/bpf/progs/linked_list_fail.c b/tools/testing/selftests/bpf/progs/linked_list_fail.c
index 6438982b928b..5f8063ecc448 100644
--- a/tools/testing/selftests/bpf/progs/linked_list_fail.c
+++ b/tools/testing/selftests/bpf/progs/linked_list_fail.c
@@ -609,4 +609,33 @@ int pop_back_off(void *ctx)
return pop_ptr_off((void *)bpf_list_pop_back);
}
+SEC("?tc")
+int direct_write_node_kernel(void *ctx)
+{
+ struct bpf_testmod_linked_list_obj *f;
+
+ f = bpf_kfunc_call_test_acq_linked_list_obj();
+ if (!f)
+ return 0;
+
+ *(__u64 *)&f->node = 0;
+ bpf_kfunc_call_test_rel_linked_list_obj(f);
+ return 0;
+}
+
+SEC("?tc")
+int push_local_node_to_kptr_list(void *ctx)
+{
+ struct bpf_testmod_linked_list_obj *f;
+
+ f = bpf_obj_new(typeof(*f));
+ if (!f)
+ return 0;
+
+ bpf_spin_lock(&glock3);
+ bpf_list_push_back(&ghead3, &f->node);
+ bpf_spin_unlock(&glock3);
+ return 0;
+}
+
char _license[] SEC("license") = "GPL";
--
2.20.1
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