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
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(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
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, arg->show_string_prefix);
82}