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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2022 Sony Group Corporation */
#include <vmlinux.h>
#include <bpf/bpf_core_read.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
int arg1 = 0;
unsigned long arg2 = 0;
unsigned long arg3 = 0;
unsigned long arg4_cx = 0;
unsigned long arg4 = 0;
unsigned long arg5 = 0;
int arg1_core = 0;
unsigned long arg2_core = 0;
unsigned long arg3_core = 0;
unsigned long arg4_core_cx = 0;
unsigned long arg4_core = 0;
unsigned long arg5_core = 0;
int option_syscall = 0;
unsigned long arg2_syscall = 0;
unsigned long arg3_syscall = 0;
unsigned long arg4_syscall = 0;
unsigned long arg5_syscall = 0;
const volatile pid_t filter_pid = 0;
SEC("kprobe/" SYS_PREFIX "sys_prctl")
int BPF_KPROBE(handle_sys_prctl)
{
struct pt_regs *real_regs;
pid_t pid = bpf_get_current_pid_tgid() >> 32;
unsigned long tmp = 0;
if (pid != filter_pid)
return 0;
real_regs = PT_REGS_SYSCALL_REGS(ctx);
/* test for PT_REGS_PARM */
#if !defined(bpf_target_arm64) && !defined(bpf_target_s390)
bpf_probe_read_kernel(&tmp, sizeof(tmp), &PT_REGS_PARM1_SYSCALL(real_regs));
#endif
arg1 = tmp;
bpf_probe_read_kernel(&arg2, sizeof(arg2), &PT_REGS_PARM2_SYSCALL(real_regs));
bpf_probe_read_kernel(&arg3, sizeof(arg3), &PT_REGS_PARM3_SYSCALL(real_regs));
bpf_probe_read_kernel(&arg4_cx, sizeof(arg4_cx), &PT_REGS_PARM4(real_regs));
bpf_probe_read_kernel(&arg4, sizeof(arg4), &PT_REGS_PARM4_SYSCALL(real_regs));
bpf_probe_read_kernel(&arg5, sizeof(arg5), &PT_REGS_PARM5_SYSCALL(real_regs));
/* test for the CORE variant of PT_REGS_PARM */
arg1_core = PT_REGS_PARM1_CORE_SYSCALL(real_regs);
arg2_core = PT_REGS_PARM2_CORE_SYSCALL(real_regs);
arg3_core = PT_REGS_PARM3_CORE_SYSCALL(real_regs);
arg4_core_cx = PT_REGS_PARM4_CORE(real_regs);
arg4_core = PT_REGS_PARM4_CORE_SYSCALL(real_regs);
arg5_core = PT_REGS_PARM5_CORE_SYSCALL(real_regs);
return 0;
}
SEC("ksyscall/prctl")
int BPF_KSYSCALL(prctl_enter, int option, unsigned long arg2,
unsigned long arg3, unsigned long arg4, unsigned long arg5)
{
pid_t pid = bpf_get_current_pid_tgid() >> 32;
if (pid != filter_pid)
return 0;
option_syscall = option;
arg2_syscall = arg2;
arg3_syscall = arg3;
arg4_syscall = arg4;
arg5_syscall = arg5;
return 0;
}
char _license[] SEC("license") = "GPL";
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