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bpf: Move kernel test kfuncs to bpf_testmod

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Moving kernel test kfuncs into bpf_testmod kernel module, and adding
necessary init calls and BTF IDs records.

We need to keep following structs in kernel:
  struct prog_test_ref_kfunc
  struct prog_test_member (embedded in prog_test_ref_kfunc)

The reason is because they need to be marked as rcu safe (check test
prog mark_ref_as_untrusted_or_null) and such objects are being required
to be defined only in kernel at the moment (see rcu_safe_kptr check
in kernel).

We need to keep also dtor functions for both objects in kernel:
  bpf_kfunc_call_test_release
  bpf_kfunc_call_memb_release

We also keep the copy of these struct in bpf_testmod_kfunc.h, because
other test functions use them. This is unfortunate, but this is just
temporary solution until we are able to these structs them to bpf_testmod
completely.

As suggested by David adding bpf_testmod.ko make dependency for
bpf programs, so they are rebuilt if we change the bpf_testmod.ko
module.

Also adding missing __bpf_kfunc to bpf_kfunc_call_test4 functions.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20230515133756.1658301-11-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2023-05-15 15:37:56 +02:00 committed by Alexei Starovoitov
parent 6e2b50fa81
commit 65eb006d85
3 changed files with 226 additions and 201 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

201
net/bpf/test_run.c
View file

@ -561,29 +561,6 @@ __bpf_kfunc int bpf_modify_return_test(int a, int *b)
return a + *b;
}
__bpf_kfunc u64 bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d)
{
return a + b + c + d;
}
__bpf_kfunc int bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b)
{
return a + b;
}
__bpf_kfunc struct sock *bpf_kfunc_call_test3(struct sock *sk)
{
return sk;
}
long noinline bpf_kfunc_call_test4(signed char a, short b, int c, long d)
{
/* Provoke the compiler to assume that the caller has sign-extended a,
* b and c on platforms where this is required (e.g. s390x).
*/
return (long)a + (long)b + (long)c + d;
}
int noinline bpf_fentry_shadow_test(int a)
{
return a + 1;
@ -606,32 +583,6 @@ struct prog_test_ref_kfunc {
refcount_t cnt;
};
static struct prog_test_ref_kfunc prog_test_struct = {
.a = 42,
.b = 108,
.next = &prog_test_struct,
.cnt = REFCOUNT_INIT(1),
};
__bpf_kfunc struct prog_test_ref_kfunc *
bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr)
{
refcount_inc(&prog_test_struct.cnt);
return &prog_test_struct;
}
__bpf_kfunc void bpf_kfunc_call_test_offset(struct prog_test_ref_kfunc *p)
{
WARN_ON_ONCE(1);
}
__bpf_kfunc struct prog_test_member *
bpf_kfunc_call_memb_acquire(void)
{
WARN_ON_ONCE(1);
return NULL;
}
__bpf_kfunc void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p)
{
refcount_dec(&p->cnt);
@ -641,134 +592,6 @@ __bpf_kfunc void bpf_kfunc_call_memb_release(struct prog_test_member *p)
{
}
__bpf_kfunc 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;
}
__bpf_kfunc 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);
}
__bpf_kfunc 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.
*/
__bpf_kfunc 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);
}
__bpf_kfunc void bpf_kfunc_call_int_mem_release(int *p)
{
}
struct prog_test_pass1 {
int x0;
struct {
int x1;
struct {
int x2;
struct {
int x3;
};
};
};
};
struct prog_test_pass2 {
int len;
short arr1[4];
struct {
char arr2[4];
unsigned long arr3[8];
} x;
};
struct prog_test_fail1 {
void *p;
int x;
};
struct prog_test_fail2 {
int x8;
struct prog_test_pass1 x;
};
struct prog_test_fail3 {
int len;
char arr1[2];
char arr2[];
};
__bpf_kfunc void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb)
{
}
__bpf_kfunc void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_fail1(struct prog_test_fail1 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_fail2(struct prog_test_fail2 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_mem_len_pass1(void *mem, int mem__sz)
{
}
__bpf_kfunc void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len)
{
}
__bpf_kfunc void bpf_kfunc_call_test_mem_len_fail2(u64 *mem, int len)
{
}
__bpf_kfunc void bpf_kfunc_call_test_ref(struct prog_test_ref_kfunc *p)
{
/* p != NULL, but p->cnt could be 0 */
}
__bpf_kfunc void bpf_kfunc_call_test_destructive(void)
{
}
__bpf_kfunc static u32 bpf_kfunc_call_test_static_unused_arg(u32 arg, u32 unused)
{
return arg;
}
__diag_pop();
BTF_SET8_START(bpf_test_modify_return_ids)
@ -782,32 +605,8 @@ static const struct btf_kfunc_id_set bpf_test_modify_return_set = {
};
BTF_SET8_START(test_sk_check_kfunc_ids)
BTF_ID_FLAGS(func, bpf_kfunc_call_test1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test2)
BTF_ID_FLAGS(func, bpf_kfunc_call_test3)
BTF_ID_FLAGS(func, bpf_kfunc_call_test4)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_acquire, KF_ACQUIRE | KF_RET_NULL)
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_pass_ctx)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass2)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail2)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail3)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_pass1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail2)
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_SET8_END(test_sk_check_kfunc_ids)
static void *bpf_test_init(const union bpf_attr *kattr, u32 user_size,

166
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
View file

@ -9,6 +9,7 @@
#include <linux/sysfs.h>
#include <linux/tracepoint.h>
#include "bpf_testmod.h"
#include "bpf_testmod_kfunc.h"
#define CREATE_TRACE_POINTS
#include "bpf_testmod-events.h"
@ -289,8 +290,171 @@ static const struct btf_kfunc_id_set bpf_testmod_common_kfunc_set = {
.set = &bpf_testmod_common_kfunc_ids,
};
__bpf_kfunc u64 bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d)
{
return a + b + c + d;
}
__bpf_kfunc int bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b)
{
return a + b;
}
__bpf_kfunc struct sock *bpf_kfunc_call_test3(struct sock *sk)
{
return sk;
}
__bpf_kfunc long noinline bpf_kfunc_call_test4(signed char a, short b, int c, long d)
{
/* Provoke the compiler to assume that the caller has sign-extended a,
* b and c on platforms where this is required (e.g. s390x).
*/
return (long)a + (long)b + (long)c + d;
}
static struct prog_test_ref_kfunc prog_test_struct = {
.a = 42,
.b = 108,
.next = &prog_test_struct,
.cnt = REFCOUNT_INIT(1),
};
__bpf_kfunc struct prog_test_ref_kfunc *
bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr)
{
refcount_inc(&prog_test_struct.cnt);
return &prog_test_struct;
}
__bpf_kfunc void bpf_kfunc_call_test_offset(struct prog_test_ref_kfunc *p)
{
WARN_ON_ONCE(1);
}
__bpf_kfunc struct prog_test_member *
bpf_kfunc_call_memb_acquire(void)
{
WARN_ON_ONCE(1);
return NULL;
}
__bpf_kfunc 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;
}
__bpf_kfunc 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);
}
__bpf_kfunc 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.
*/
__bpf_kfunc 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);
}
__bpf_kfunc void bpf_kfunc_call_int_mem_release(int *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb)
{
}
__bpf_kfunc void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_fail1(struct prog_test_fail1 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_fail2(struct prog_test_fail2 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p)
{
}
__bpf_kfunc void bpf_kfunc_call_test_mem_len_pass1(void *mem, int mem__sz)
{
}
__bpf_kfunc void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len)
{
}
__bpf_kfunc void bpf_kfunc_call_test_mem_len_fail2(u64 *mem, int len)
{
}
__bpf_kfunc void bpf_kfunc_call_test_ref(struct prog_test_ref_kfunc *p)
{
/* p != NULL, but p->cnt could be 0 */
}
__bpf_kfunc void bpf_kfunc_call_test_destructive(void)
{
}
__bpf_kfunc static u32 bpf_kfunc_call_test_static_unused_arg(u32 arg, u32 unused)
{
return arg;
}
BTF_SET8_START(bpf_testmod_check_kfunc_ids)
BTF_ID_FLAGS(func, bpf_testmod_test_mod_kfunc)
BTF_ID_FLAGS(func, bpf_kfunc_call_test1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test2)
BTF_ID_FLAGS(func, bpf_kfunc_call_test3)
BTF_ID_FLAGS(func, bpf_kfunc_call_test4)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_pass1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail2)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_acquire, KF_ACQUIRE | KF_RET_NULL)
BTF_ID_FLAGS(func, bpf_kfunc_call_memb_acquire, KF_ACQUIRE | KF_RET_NULL)
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_pass_ctx)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass2)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail1)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail2)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail3)
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_SET8_END(bpf_testmod_check_kfunc_ids)
static const struct btf_kfunc_id_set bpf_testmod_kfunc_set = {
@ -312,6 +476,8 @@ static int bpf_testmod_init(void)
ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, &bpf_testmod_common_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_testmod_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_testmod_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_testmod_kfunc_set);
if (ret < 0)
return ret;
if (bpf_fentry_test1(0) < 0)

60
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h
View file

@ -8,8 +8,62 @@
#include <bpf/bpf_helpers.h>
#else
#define __ksym
struct prog_test_member1 {
int a;
};
struct prog_test_member {
struct prog_test_member1 m;
int c;
};
struct prog_test_ref_kfunc {
int a;
int b;
struct prog_test_member memb;
struct prog_test_ref_kfunc *next;
refcount_t cnt;
};
#endif
struct prog_test_pass1 {
int x0;
struct {
int x1;
struct {
int x2;
struct {
int x3;
};
};
};
};
struct prog_test_pass2 {
int len;
short arr1[4];
struct {
char arr2[4];
unsigned long arr3[8];
} x;
};
struct prog_test_fail1 {
void *p;
int x;
};
struct prog_test_fail2 {
int x8;
struct prog_test_pass1 x;
};
struct prog_test_fail3 {
int len;
char arr1[2];
char arr2[];
};
struct prog_test_ref_kfunc *
bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr) __ksym;
void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym;
@ -20,7 +74,13 @@ int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int r
int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) __ksym;
int *bpf_kfunc_call_test_acq_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) __ksym;
void bpf_kfunc_call_int_mem_release(int *p) __ksym;
/* The bpf_kfunc_call_test_static_unused_arg is defined as static,
* but bpf program compilation needs to see it as global symbol.
*/
#ifndef __KERNEL__
u32 bpf_kfunc_call_test_static_unused_arg(u32 arg, u32 unused) __ksym;
#endif
void bpf_testmod_test_mod_kfunc(int i) __ksym;