tools/testing/selftests/bpf/progs/bpf_syscall_macro.c

   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
  10 int arg1 = 0;
  11 unsigned long arg2 = 0;
  12 unsigned long arg3 = 0;
  13 unsigned long arg4_cx = 0;
  14 unsigned long arg4 = 0;
  15 unsigned long arg5 = 0;
  16
  17 int arg1_core = 0;
  18 unsigned long arg2_core = 0;
  19 unsigned long arg3_core = 0;
  20 unsigned long arg4_core_cx = 0;
  21 unsigned long arg4_core = 0;
  22 unsigned long arg5_core = 0;
  23
  24 int option_syscall = 0;
  25 unsigned long arg2_syscall = 0;
  26 unsigned long arg3_syscall = 0;
  27 unsigned long arg4_syscall = 0;
  28 unsigned long arg5_syscall = 0;
  29
  30 const volatile pid_t filter_pid = 0;
  31
  32 SEC("kprobe/" SYS_PREFIX "sys_prctl")
  33 int 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
  67 SEC("ksyscall/prctl")
  68 int BPF_KSYSCALL(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
  84 __u64 splice_fd_in;
  85 __u64 splice_off_in;
  86 __u64 splice_fd_out;
  87 __u64 splice_off_out;
  88 __u64 splice_len;
  89 __u64 splice_flags;
  90
  91 SEC("ksyscall/splice")
  92 int BPF_KSYSCALL(splice_enter, int fd_in, loff_t *off_in, int fd_out,
  93                  loff_t *off_out, size_t len, unsigned int flags)
  94 {
  95         pid_t pid = bpf_get_current_pid_tgid() >> 32;
  96
  97         if (pid != filter_pid)
  98                 return 0;
  99
 100         splice_fd_in = fd_in;
 101         splice_off_in = (__u64)off_in;
 102         splice_fd_out = fd_out;
 103         splice_off_out = (__u64)off_out;
 104         splice_len = len;
 105         splice_flags = flags;
 106
 107         return 0;
 108 }
 109
 110 char _license[] SEC("license") = "GPL";