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