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")
BPF_KPROBE(handle_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")
BPF_KSYSCALL(prctl_enter,int option,unsigned long arg2,unsigned long arg3,unsigned long arg4,unsigned long arg5)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")
BPF_KSYSCALL(splice_enter,int fd_in,loff_t * off_in,int fd_out,loff_t * off_out,size_t len,unsigned int flags)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";
109