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