1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * trace/beauty/prctl.c
4 *
5 * Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
6 */
7
8#include "trace/beauty/beauty.h"
9#include <linux/kernel.h>
10#include <linux/prctl.h>
11
12#include "trace/beauty/generated/prctl_option_array.c"
13
14DEFINE_STRARRAY(prctl_options, "PR_");
15
16static size_t prctl__scnprintf_option(int option, char *bf, size_t size, bool show_prefix)
17{
18 return strarray__scnprintf(&strarray__prctl_options, bf, size, "%d", show_prefix, option);
19}
20
21static size_t prctl__scnprintf_set_mm(int option, char *bf, size_t size, bool show_prefix)
22{
23 static DEFINE_STRARRAY(prctl_set_mm_options, "PR_SET_MM_");
24 return strarray__scnprintf(&strarray__prctl_set_mm_options, bf, size, "%d", show_prefix, option);
25}
26
27size_t syscall_arg__scnprintf_prctl_arg2(char *bf, size_t size, struct syscall_arg *arg)
28{
29 int option = syscall_arg__val(arg, 0);
30
31 if (option == PR_SET_MM)
32 return prctl__scnprintf_set_mm(option: arg->val, bf, size, show_prefix: arg->show_string_prefix);
33 /*
34 * We still don't grab the contents of pointers on entry or exit,
35 * so just print them as hex numbers
36 */
37 if (option == PR_SET_NAME)
38 return syscall_arg__scnprintf_hex(bf, size, arg);
39
40 return syscall_arg__scnprintf_long(bf, size, arg);
41}
42
43size_t syscall_arg__scnprintf_prctl_arg3(char *bf, size_t size, struct syscall_arg *arg)
44{
45 int option = syscall_arg__val(arg, 0);
46
47 if (option == PR_SET_MM)
48 return syscall_arg__scnprintf_hex(bf, size, arg);
49
50 return syscall_arg__scnprintf_long(bf, size, arg);
51}
52
53size_t syscall_arg__scnprintf_prctl_option(char *bf, size_t size, struct syscall_arg *arg)
54{
55 unsigned long option = arg->val;
56 enum {
57 SPO_ARG2 = (1 << 1),
58 SPO_ARG3 = (1 << 2),
59 SPO_ARG4 = (1 << 3),
60 SPO_ARG5 = (1 << 4),
61 SPO_ARG6 = (1 << 5),
62 };
63 const u8 all_but2 = SPO_ARG3 | SPO_ARG4 | SPO_ARG5 | SPO_ARG6;
64 const u8 all = SPO_ARG2 | all_but2;
65 const u8 masks[] = {
66 [PR_GET_DUMPABLE] = all,
67 [PR_SET_DUMPABLE] = all_but2,
68 [PR_SET_NAME] = all_but2,
69 [PR_GET_CHILD_SUBREAPER] = all_but2,
70 [PR_SET_CHILD_SUBREAPER] = all_but2,
71 [PR_GET_SECUREBITS] = all,
72 [PR_SET_SECUREBITS] = all_but2,
73 [PR_SET_MM] = SPO_ARG4 | SPO_ARG5 | SPO_ARG6,
74 [PR_GET_PDEATHSIG] = all,
75 [PR_SET_PDEATHSIG] = all_but2,
76 };
77
78 if (option < ARRAY_SIZE(masks))
79 arg->mask |= masks[option];
80
81 return prctl__scnprintf_option(option, bf, size, show_prefix: arg->show_string_prefix);
82}
83

source code of linux/tools/perf/trace/beauty/prctl.c