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-rw-r--r--net/bpf/test_run.c36
-rw-r--r--tools/testing/selftests/bpf/prog_tests/kfunc_call.c7
-rw-r--r--tools/testing/selftests/bpf/progs/kfunc_call_fail.c121
-rw-r--r--tools/testing/selftests/bpf/progs/kfunc_call_test.c33
4 files changed, 197 insertions, 0 deletions
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index f16baf977a21..13d578ce2a09 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -606,6 +606,38 @@ noinline void bpf_kfunc_call_memb1_release(struct prog_test_member1 *p)
WARN_ON_ONCE(1);
}
+static int *__bpf_kfunc_call_test_get_mem(struct prog_test_ref_kfunc *p, const int size)
+{
+ if (size > 2 * sizeof(int))
+ return NULL;
+
+ return (int *)p;
+}
+
+noinline int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int rdwr_buf_size)
+{
+ return __bpf_kfunc_call_test_get_mem(p, rdwr_buf_size);
+}
+
+noinline int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size)
+{
+ return __bpf_kfunc_call_test_get_mem(p, rdonly_buf_size);
+}
+
+/* the next 2 ones can't be really used for testing expect to ensure
+ * that the verifier rejects the call.
+ * Acquire functions must return struct pointers, so these ones are
+ * failing.
+ */
+noinline int *bpf_kfunc_call_test_acq_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size)
+{
+ return __bpf_kfunc_call_test_get_mem(p, rdonly_buf_size);
+}
+
+noinline void bpf_kfunc_call_int_mem_release(int *p)
+{
+}
+
noinline struct prog_test_ref_kfunc *
bpf_kfunc_call_test_kptr_get(struct prog_test_ref_kfunc **pp, int a, int b)
{
@@ -712,6 +744,10 @@ BTF_ID_FLAGS(func, bpf_kfunc_call_memb_acquire, KF_ACQUIRE | KF_RET_NULL)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_release, KF_RELEASE)
BTF_ID_FLAGS(func, bpf_kfunc_call_memb_release, KF_RELEASE)
BTF_ID_FLAGS(func, bpf_kfunc_call_memb1_release, KF_RELEASE)
+BTF_ID_FLAGS(func, bpf_kfunc_call_test_get_rdwr_mem, KF_RET_NULL)
+BTF_ID_FLAGS(func, bpf_kfunc_call_test_get_rdonly_mem, KF_RET_NULL)
+BTF_ID_FLAGS(func, bpf_kfunc_call_test_acq_rdonly_mem, KF_ACQUIRE | KF_RET_NULL)
+BTF_ID_FLAGS(func, bpf_kfunc_call_int_mem_release, KF_RELEASE)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_kptr_get, KF_ACQUIRE | KF_RET_NULL | KF_KPTR_GET)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass_ctx)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass1)
diff --git a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
index d5881c3331a8..5af1ee8f0e6e 100644
--- a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
+++ b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
@@ -50,6 +50,7 @@ struct kfunc_test_params {
#define SYSCALL_TEST(name, retval) __BPF_TEST_SUCCESS(name, retval, syscall_test)
#define SYSCALL_NULL_CTX_TEST(name, retval) __BPF_TEST_SUCCESS(name, retval, syscall_null_ctx_test)
+#define TC_FAIL(name, retval, error_msg) __BPF_TEST_FAIL(name, retval, tc_test, error_msg)
#define SYSCALL_NULL_CTX_FAIL(name, retval, error_msg) \
__BPF_TEST_FAIL(name, retval, syscall_null_ctx_test, error_msg)
@@ -62,11 +63,17 @@ static struct kfunc_test_params kfunc_tests[] = {
*/
SYSCALL_NULL_CTX_FAIL(kfunc_syscall_test_fail, -EINVAL, "processed 4 insns"),
SYSCALL_NULL_CTX_FAIL(kfunc_syscall_test_null_fail, -EINVAL, "processed 4 insns"),
+ TC_FAIL(kfunc_call_test_get_mem_fail_rdonly, 0, "R0 cannot write into rdonly_mem"),
+ TC_FAIL(kfunc_call_test_get_mem_fail_use_after_free, 0, "invalid mem access 'scalar'"),
+ TC_FAIL(kfunc_call_test_get_mem_fail_oob, 0, "min value is outside of the allowed memory range"),
+ TC_FAIL(kfunc_call_test_get_mem_fail_not_const, 0, "is not a const"),
+ TC_FAIL(kfunc_call_test_mem_acquire_fail, 0, "acquire kernel function does not return PTR_TO_BTF_ID"),
/* success cases */
TC_TEST(kfunc_call_test1, 12),
TC_TEST(kfunc_call_test2, 3),
TC_TEST(kfunc_call_test_ref_btf_id, 0),
+ TC_TEST(kfunc_call_test_get_mem, 42),
SYSCALL_TEST(kfunc_syscall_test, 0),
SYSCALL_NULL_CTX_TEST(kfunc_syscall_test_null, 0),
};
diff --git a/tools/testing/selftests/bpf/progs/kfunc_call_fail.c b/tools/testing/selftests/bpf/progs/kfunc_call_fail.c
index 4168027f2ab1..b98313d391c6 100644
--- a/tools/testing/selftests/bpf/progs/kfunc_call_fail.c
+++ b/tools/testing/selftests/bpf/progs/kfunc_call_fail.c
@@ -3,7 +3,13 @@
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
+extern struct prog_test_ref_kfunc *bpf_kfunc_call_test_acquire(unsigned long *sp) __ksym;
+extern void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym;
extern void bpf_kfunc_call_test_mem_len_pass1(void *mem, int len) __ksym;
+extern int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int rdwr_buf_size) __ksym;
+extern int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) __ksym;
+extern int *bpf_kfunc_call_test_acq_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) __ksym;
+extern void bpf_kfunc_call_int_mem_release(int *p) __ksym;
struct syscall_test_args {
__u8 data[16];
@@ -36,4 +42,119 @@ int kfunc_syscall_test_null_fail(struct syscall_test_args *args)
return 0;
}
+SEC("?tc")
+int kfunc_call_test_get_mem_fail_rdonly(struct __sk_buff *skb)
+{
+ struct prog_test_ref_kfunc *pt;
+ unsigned long s = 0;
+ int *p = NULL;
+ int ret = 0;
+
+ pt = bpf_kfunc_call_test_acquire(&s);
+ if (pt) {
+ p = bpf_kfunc_call_test_get_rdonly_mem(pt, 2 * sizeof(int));
+ if (p)
+ p[0] = 42; /* this is a read-only buffer, so -EACCES */
+ else
+ ret = -1;
+
+ bpf_kfunc_call_test_release(pt);
+ }
+ return ret;
+}
+
+SEC("?tc")
+int kfunc_call_test_get_mem_fail_use_after_free(struct __sk_buff *skb)
+{
+ struct prog_test_ref_kfunc *pt;
+ unsigned long s = 0;
+ int *p = NULL;
+ int ret = 0;
+
+ pt = bpf_kfunc_call_test_acquire(&s);
+ if (pt) {
+ p = bpf_kfunc_call_test_get_rdwr_mem(pt, 2 * sizeof(int));
+ if (p) {
+ p[0] = 42;
+ ret = p[1]; /* 108 */
+ } else {
+ ret = -1;
+ }
+
+ bpf_kfunc_call_test_release(pt);
+ }
+ if (p)
+ ret = p[0]; /* p is not valid anymore */
+
+ return ret;
+}
+
+SEC("?tc")
+int kfunc_call_test_get_mem_fail_oob(struct __sk_buff *skb)
+{
+ struct prog_test_ref_kfunc *pt;
+ unsigned long s = 0;
+ int *p = NULL;
+ int ret = 0;
+
+ pt = bpf_kfunc_call_test_acquire(&s);
+ if (pt) {
+ p = bpf_kfunc_call_test_get_rdonly_mem(pt, 2 * sizeof(int));
+ if (p)
+ ret = p[2 * sizeof(int)]; /* oob access, so -EACCES */
+ else
+ ret = -1;
+
+ bpf_kfunc_call_test_release(pt);
+ }
+ return ret;
+}
+
+int not_const_size = 2 * sizeof(int);
+
+SEC("?tc")
+int kfunc_call_test_get_mem_fail_not_const(struct __sk_buff *skb)
+{
+ struct prog_test_ref_kfunc *pt;
+ unsigned long s = 0;
+ int *p = NULL;
+ int ret = 0;
+
+ pt = bpf_kfunc_call_test_acquire(&s);
+ if (pt) {
+ p = bpf_kfunc_call_test_get_rdonly_mem(pt, not_const_size); /* non const size, -EINVAL */
+ if (p)
+ ret = p[0];
+ else
+ ret = -1;
+
+ bpf_kfunc_call_test_release(pt);
+ }
+ return ret;
+}
+
+SEC("?tc")
+int kfunc_call_test_mem_acquire_fail(struct __sk_buff *skb)
+{
+ struct prog_test_ref_kfunc *pt;
+ unsigned long s = 0;
+ int *p = NULL;
+ int ret = 0;
+
+ pt = bpf_kfunc_call_test_acquire(&s);
+ if (pt) {
+ /* we are failing on this one, because we are not acquiring a PTR_TO_BTF_ID (a struct ptr) */
+ p = bpf_kfunc_call_test_acq_rdonly_mem(pt, 2 * sizeof(int));
+ if (p)
+ ret = p[0];
+ else
+ ret = -1;
+
+ bpf_kfunc_call_int_mem_release(p);
+
+ bpf_kfunc_call_test_release(pt);
+ }
+ return ret;
+}
+
char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/kfunc_call_test.c b/tools/testing/selftests/bpf/progs/kfunc_call_test.c
index 9e1914916f1d..f636e50be259 100644
--- a/tools/testing/selftests/bpf/progs/kfunc_call_test.c
+++ b/tools/testing/selftests/bpf/progs/kfunc_call_test.c
@@ -14,6 +14,8 @@ extern void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p) __ksym;
extern void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p) __ksym;
extern void bpf_kfunc_call_test_mem_len_pass1(void *mem, int len) __ksym;
extern void bpf_kfunc_call_test_mem_len_fail2(__u64 *mem, int len) __ksym;
+extern int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int rdwr_buf_size) __ksym;
+extern int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) __ksym;
SEC("tc")
int kfunc_call_test2(struct __sk_buff *skb)
@@ -130,4 +132,35 @@ int kfunc_syscall_test_null(struct syscall_test_args *args)
return 0;
}
+SEC("tc")
+int kfunc_call_test_get_mem(struct __sk_buff *skb)
+{
+ struct prog_test_ref_kfunc *pt;
+ unsigned long s = 0;
+ int *p = NULL;
+ int ret = 0;
+
+ pt = bpf_kfunc_call_test_acquire(&s);
+ if (pt) {
+ p = bpf_kfunc_call_test_get_rdwr_mem(pt, 2 * sizeof(int));
+ if (p) {
+ p[0] = 42;
+ ret = p[1]; /* 108 */
+ } else {
+ ret = -1;
+ }
+
+ if (ret >= 0) {
+ p = bpf_kfunc_call_test_get_rdonly_mem(pt, 2 * sizeof(int));
+ if (p)
+ ret = p[0]; /* 42 */
+ else
+ ret = -1;
+ }
+
+ bpf_kfunc_call_test_release(pt);
+ }
+ return ret;
+}
+
char _license[] SEC("license") = "GPL";
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-26 18:19:08 +0000