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         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
  65 SEC("ksyscall/prctl")
  66 int 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
  89 SEC("ksyscall/splice")
  90 int 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
 108 char _license[] SEC("license") = "GPL";