cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bpf_syscall_macro.c (2350B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* 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#if !defined(bpf_target_arm64) && !defined(bpf_target_s390)
     47	bpf_probe_read_kernel(&tmp, sizeof(tmp), &PT_REGS_PARM1_SYSCALL(real_regs));
     48#endif
     49	arg1 = tmp;
     50	bpf_probe_read_kernel(&arg2, sizeof(arg2), &PT_REGS_PARM2_SYSCALL(real_regs));
     51	bpf_probe_read_kernel(&arg3, sizeof(arg3), &PT_REGS_PARM3_SYSCALL(real_regs));
     52	bpf_probe_read_kernel(&arg4_cx, sizeof(arg4_cx), &PT_REGS_PARM4(real_regs));
     53	bpf_probe_read_kernel(&arg4, sizeof(arg4), &PT_REGS_PARM4_SYSCALL(real_regs));
     54	bpf_probe_read_kernel(&arg5, sizeof(arg5), &PT_REGS_PARM5_SYSCALL(real_regs));
     55
     56	/* test for the CORE variant of PT_REGS_PARM */
     57	arg1_core = PT_REGS_PARM1_CORE_SYSCALL(real_regs);
     58	arg2_core = PT_REGS_PARM2_CORE_SYSCALL(real_regs);
     59	arg3_core = PT_REGS_PARM3_CORE_SYSCALL(real_regs);
     60	arg4_core_cx = PT_REGS_PARM4_CORE(real_regs);
     61	arg4_core = PT_REGS_PARM4_CORE_SYSCALL(real_regs);
     62	arg5_core = PT_REGS_PARM5_CORE_SYSCALL(real_regs);
     63
     64	return 0;
     65}
     66
     67SEC("kprobe/" SYS_PREFIX "sys_prctl")
     68int BPF_KPROBE_SYSCALL(prctl_enter, int option, unsigned long arg2,
     69		       unsigned long arg3, unsigned long arg4, unsigned long arg5)
     70{
     71	pid_t pid = bpf_get_current_pid_tgid() >> 32;
     72
     73	if (pid != filter_pid)
     74		return 0;
     75
     76	option_syscall = option;
     77	arg2_syscall = arg2;
     78	arg3_syscall = arg3;
     79	arg4_syscall = arg4;
     80	arg5_syscall = arg5;
     81	return 0;
     82}
     83
     84char _license[] SEC("license") = "GPL";