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