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 <uapi/linux/prctl.h>
11
12 #include "trace/beauty/generated/prctl_option_array.c"
13
14 DEFINE_STRARRAY(prctl_options, "PR_");
15
prctl__scnprintf_option(int option,char * bf,size_t size,bool show_prefix)16 static 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
prctl__scnprintf_set_mm(int option,char * bf,size_t size,bool show_prefix)21 static 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
syscall_arg__scnprintf_prctl_arg2(char * bf,size_t size,struct syscall_arg * arg)27 size_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(arg->val, bf, size, 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
syscall_arg__scnprintf_prctl_arg3(char * bf,size_t size,struct syscall_arg * arg)43 size_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
syscall_arg__scnprintf_prctl_option(char * bf,size_t size,struct syscall_arg * arg)53 size_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, arg->show_string_prefix);
82 }
83