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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#define MAX_LEN 256
char buf_in1[MAX_LEN] = {};
char buf_in2[MAX_LEN] = {};
int test_pid = 0;
bool capture = false;
/* .bss */
__u64 payload1_len1 = 0;
__u64 payload1_len2 = 0;
__u64 total1 = 0;
char payload1[MAX_LEN + MAX_LEN] = {};
__u64 ret_bad_read = 0;
/* .data */
int payload2_len1 = -1;
int payload2_len2 = -1;
int total2 = -1;
char payload2[MAX_LEN + MAX_LEN] = { 1 };
int payload3_len1 = -1;
int payload3_len2 = -1;
int total3= -1;
char payload3[MAX_LEN + MAX_LEN] = { 1 };
int payload4_len1 = -1;
int payload4_len2 = -1;
int total4= -1;
char payload4[MAX_LEN + MAX_LEN] = { 1 };
char payload_bad[5] = { 0x42, 0x42, 0x42, 0x42, 0x42 };
SEC("raw_tp/sys_enter")
int handler64_unsigned(void *regs)
{
int pid = bpf_get_current_pid_tgid() >> 32;
void *payload = payload1;
long len;
/* ignore irrelevant invocations */
if (test_pid != pid || !capture)
return 0;
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in1[0]);
if (len >= 0) {
payload += len;
payload1_len1 = len;
}
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in2[0]);
if (len >= 0) {
payload += len;
payload1_len2 = len;
}
total1 = payload - (void *)payload1;
ret_bad_read = bpf_probe_read_kernel_str(payload_bad + 2, 1, (void *) -1);
return 0;
}
SEC("raw_tp/sys_exit")
int handler64_signed(void *regs)
{
int pid = bpf_get_current_pid_tgid() >> 32;
void *payload = payload3;
long len;
/* ignore irrelevant invocations */
if (test_pid != pid || !capture)
return 0;
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in1[0]);
if (len >= 0) {
payload += len;
payload3_len1 = len;
}
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in2[0]);
if (len >= 0) {
payload += len;
payload3_len2 = len;
}
total3 = payload - (void *)payload3;
return 0;
}
SEC("tp/raw_syscalls/sys_enter")
int handler32_unsigned(void *regs)
{
int pid = bpf_get_current_pid_tgid() >> 32;
void *payload = payload2;
u32 len;
/* ignore irrelevant invocations */
if (test_pid != pid || !capture)
return 0;
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in1[0]);
if (len <= MAX_LEN) {
payload += len;
payload2_len1 = len;
}
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in2[0]);
if (len <= MAX_LEN) {
payload += len;
payload2_len2 = len;
}
total2 = payload - (void *)payload2;
return 0;
}
SEC("tp/raw_syscalls/sys_exit")
int handler32_signed(void *regs)
{
int pid = bpf_get_current_pid_tgid() >> 32;
void *payload = payload4;
long len;
/* ignore irrelevant invocations */
if (test_pid != pid || !capture)
return 0;
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in1[0]);
if (len >= 0) {
payload += len;
payload4_len1 = len;
}
len = bpf_probe_read_kernel_str(payload, MAX_LEN, &buf_in2[0]);
if (len >= 0) {
payload += len;
payload4_len2 = len;
}
total4 = payload - (void *)payload4;
return 0;
}
SEC("tp/syscalls/sys_exit_getpid")
int handler_exit(void *regs)
{
long bla;
if (bpf_probe_read_kernel(&bla, sizeof(bla), 0))
return 1;
else
return 0;
}
char LICENSE[] SEC("license") = "GPL";
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