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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2024. Huawei Technologies Co., Ltd */
#include "vmlinux.h"
#include <linux/types.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
int target_pid = 0;
void *user_ptr = 0;
int read_ret[9];
char _license[] SEC("license") = "GPL";
/*
* This is the only kfunc, the others are helpers
*/
int bpf_copy_from_user_str(void *dst, u32, const void *, u64) __weak __ksym;
SEC("fentry/" SYS_PREFIX "sys_nanosleep")
int do_probe_read(void *ctx)
{
char buf[8];
if ((bpf_get_current_pid_tgid() >> 32) != target_pid)
return 0;
read_ret[0] = bpf_probe_read_kernel(buf, sizeof(buf), user_ptr);
read_ret[1] = bpf_probe_read_kernel_str(buf, sizeof(buf), user_ptr);
read_ret[2] = bpf_probe_read(buf, sizeof(buf), user_ptr);
read_ret[3] = bpf_probe_read_str(buf, sizeof(buf), user_ptr);
read_ret[4] = bpf_probe_read_user(buf, sizeof(buf), user_ptr);
read_ret[5] = bpf_probe_read_user_str(buf, sizeof(buf), user_ptr);
return 0;
}
SEC("fentry.s/" SYS_PREFIX "sys_nanosleep")
int do_copy_from_user(void *ctx)
{
char buf[8];
if ((bpf_get_current_pid_tgid() >> 32) != target_pid)
return 0;
read_ret[6] = bpf_copy_from_user(buf, sizeof(buf), user_ptr);
read_ret[7] = bpf_copy_from_user_task(buf, sizeof(buf), user_ptr,
bpf_get_current_task_btf(), 0);
read_ret[8] = bpf_copy_from_user_str((char *)buf, sizeof(buf), user_ptr, 0);
return 0;
}
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