99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2025. Huawei Technologies Co., Ltd */
|
|
|
|
#include <linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include "bpf_misc.h"
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_RINGBUF);
|
|
__uint(map_flags, BPF_F_RB_OVERWRITE);
|
|
} ringbuf SEC(".maps");
|
|
|
|
int pid;
|
|
|
|
const volatile unsigned long LEN1;
|
|
const volatile unsigned long LEN2;
|
|
const volatile unsigned long LEN3;
|
|
const volatile unsigned long LEN4;
|
|
const volatile unsigned long LEN5;
|
|
|
|
long reserve1_fail = 0;
|
|
long reserve2_fail = 0;
|
|
long reserve3_fail = 0;
|
|
long reserve4_fail = 0;
|
|
long reserve5_fail = 0;
|
|
|
|
unsigned long avail_data = 0;
|
|
unsigned long ring_size = 0;
|
|
unsigned long cons_pos = 0;
|
|
unsigned long prod_pos = 0;
|
|
unsigned long over_pos = 0;
|
|
|
|
SEC("fentry/" SYS_PREFIX "sys_getpgid")
|
|
int test_overwrite_ringbuf(void *ctx)
|
|
{
|
|
char *rec1, *rec2, *rec3, *rec4, *rec5;
|
|
int cur_pid = bpf_get_current_pid_tgid() >> 32;
|
|
|
|
if (cur_pid != pid)
|
|
return 0;
|
|
|
|
rec1 = bpf_ringbuf_reserve(&ringbuf, LEN1, 0);
|
|
if (!rec1) {
|
|
reserve1_fail = 1;
|
|
return 0;
|
|
}
|
|
|
|
rec2 = bpf_ringbuf_reserve(&ringbuf, LEN2, 0);
|
|
if (!rec2) {
|
|
bpf_ringbuf_discard(rec1, 0);
|
|
reserve2_fail = 1;
|
|
return 0;
|
|
}
|
|
|
|
rec3 = bpf_ringbuf_reserve(&ringbuf, LEN3, 0);
|
|
/* expect failure */
|
|
if (!rec3) {
|
|
reserve3_fail = 1;
|
|
} else {
|
|
bpf_ringbuf_discard(rec1, 0);
|
|
bpf_ringbuf_discard(rec2, 0);
|
|
bpf_ringbuf_discard(rec3, 0);
|
|
return 0;
|
|
}
|
|
|
|
rec4 = bpf_ringbuf_reserve(&ringbuf, LEN4, 0);
|
|
if (!rec4) {
|
|
reserve4_fail = 1;
|
|
bpf_ringbuf_discard(rec1, 0);
|
|
bpf_ringbuf_discard(rec2, 0);
|
|
return 0;
|
|
}
|
|
|
|
bpf_ringbuf_submit(rec1, 0);
|
|
bpf_ringbuf_submit(rec2, 0);
|
|
bpf_ringbuf_submit(rec4, 0);
|
|
|
|
rec5 = bpf_ringbuf_reserve(&ringbuf, LEN5, 0);
|
|
if (!rec5) {
|
|
reserve5_fail = 1;
|
|
return 0;
|
|
}
|
|
|
|
for (int i = 0; i < LEN3; i++)
|
|
rec5[i] = 0xdd;
|
|
|
|
bpf_ringbuf_submit(rec5, 0);
|
|
|
|
ring_size = bpf_ringbuf_query(&ringbuf, BPF_RB_RING_SIZE);
|
|
avail_data = bpf_ringbuf_query(&ringbuf, BPF_RB_AVAIL_DATA);
|
|
cons_pos = bpf_ringbuf_query(&ringbuf, BPF_RB_CONS_POS);
|
|
prod_pos = bpf_ringbuf_query(&ringbuf, BPF_RB_PROD_POS);
|
|
over_pos = bpf_ringbuf_query(&ringbuf, BPF_RB_OVERWRITE_POS);
|
|
|
|
return 0;
|
|
}
|