109 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Copyright 2022 Sony Group Corporation */3#include <vmlinux.h>4 5#include <bpf/bpf_core_read.h>6#include <bpf/bpf_helpers.h>7#include <bpf/bpf_tracing.h>8#include "bpf_misc.h"9 10int arg1 = 0;11unsigned long arg2 = 0;12unsigned long arg3 = 0;13unsigned long arg4_cx = 0;14unsigned long arg4 = 0;15unsigned long arg5 = 0;16 17int arg1_core = 0;18unsigned long arg2_core = 0;19unsigned long arg3_core = 0;20unsigned long arg4_core_cx = 0;21unsigned long arg4_core = 0;22unsigned long arg5_core = 0;23 24int option_syscall = 0;25unsigned long arg2_syscall = 0;26unsigned long arg3_syscall = 0;27unsigned long arg4_syscall = 0;28unsigned long arg5_syscall = 0;29 30const volatile pid_t filter_pid = 0;31 32SEC("kprobe/" SYS_PREFIX "sys_prctl")33int BPF_KPROBE(handle_sys_prctl)34{35 struct pt_regs *real_regs;36 pid_t pid = bpf_get_current_pid_tgid() >> 32;37 unsigned long tmp = 0;38 39 if (pid != filter_pid)40 return 0;41 42 real_regs = PT_REGS_SYSCALL_REGS(ctx);43 44 /* test for PT_REGS_PARM */45 46 bpf_probe_read_kernel(&tmp, sizeof(tmp), &PT_REGS_PARM1_SYSCALL(real_regs));47 arg1 = tmp;48 bpf_probe_read_kernel(&arg2, sizeof(arg2), &PT_REGS_PARM2_SYSCALL(real_regs));49 bpf_probe_read_kernel(&arg3, sizeof(arg3), &PT_REGS_PARM3_SYSCALL(real_regs));50 bpf_probe_read_kernel(&arg4_cx, sizeof(arg4_cx), &PT_REGS_PARM4(real_regs));51 bpf_probe_read_kernel(&arg4, sizeof(arg4), &PT_REGS_PARM4_SYSCALL(real_regs));52 bpf_probe_read_kernel(&arg5, sizeof(arg5), &PT_REGS_PARM5_SYSCALL(real_regs));53 54 /* test for the CORE variant of PT_REGS_PARM */55 arg1_core = PT_REGS_PARM1_CORE_SYSCALL(real_regs);56 arg2_core = PT_REGS_PARM2_CORE_SYSCALL(real_regs);57 arg3_core = PT_REGS_PARM3_CORE_SYSCALL(real_regs);58 arg4_core_cx = PT_REGS_PARM4_CORE(real_regs);59 arg4_core = PT_REGS_PARM4_CORE_SYSCALL(real_regs);60 arg5_core = PT_REGS_PARM5_CORE_SYSCALL(real_regs);61 62 return 0;63}64 65SEC("ksyscall/prctl")66int BPF_KSYSCALL(prctl_enter, int option, unsigned long arg2,67 unsigned long arg3, unsigned long arg4, unsigned long arg5)68{69 pid_t pid = bpf_get_current_pid_tgid() >> 32;70 71 if (pid != filter_pid)72 return 0;73 74 option_syscall = option;75 arg2_syscall = arg2;76 arg3_syscall = arg3;77 arg4_syscall = arg4;78 arg5_syscall = arg5;79 return 0;80}81 82__u64 splice_fd_in;83__u64 splice_off_in;84__u64 splice_fd_out;85__u64 splice_off_out;86__u64 splice_len;87__u64 splice_flags;88 89SEC("ksyscall/splice")90int BPF_KSYSCALL(splice_enter, int fd_in, loff_t *off_in, int fd_out,91 loff_t *off_out, size_t len, unsigned int flags)92{93 pid_t pid = bpf_get_current_pid_tgid() >> 32;94 95 if (pid != filter_pid)96 return 0;97 98 splice_fd_in = fd_in;99 splice_off_in = (__u64)off_in;100 splice_fd_out = fd_out;101 splice_off_out = (__u64)off_out;102 splice_len = len;103 splice_flags = flags;104 105 return 0;106}107 108char _license[] SEC("license") = "GPL";109