modutils: make them NOEXEC except depmod
[oweals/busybox.git] / modutils / lsmod.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini lsmod implementation for busybox
4  *
5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6  * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
7  *
8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9  */
10 //config:config LSMOD
11 //config:       bool "lsmod (4.3 kb)"
12 //config:       default y
13 //config:       select PLATFORM_LINUX
14 //config:       help
15 //config:       lsmod is used to display a list of loaded modules.
16 //config:
17 //config:config FEATURE_LSMOD_PRETTY_2_6_OUTPUT
18 //config:       bool "Pretty output"
19 //config:       default y
20 //config:       depends on LSMOD && !MODPROBE_SMALL
21 //config:       help
22 //config:       This option makes output format of lsmod adjusted to
23 //config:       the format of module-init-tools for Linux kernel 2.6.
24 //config:       Increases size somewhat.
25
26 //applet:IF_LSMOD(IF_NOT_MODPROBE_SMALL(APPLET_NOEXEC(lsmod, lsmod, BB_DIR_SBIN, BB_SUID_DROP, lsmod)))
27
28 //kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
29 //kbuild:lib-$(CONFIG_LSMOD) += lsmod.o modutils.o
30 //kbuild:endif
31
32 //usage:#if !ENABLE_MODPROBE_SMALL
33 //usage:#define lsmod_trivial_usage
34 //usage:       ""
35 //usage:#define lsmod_full_usage "\n\n"
36 //usage:       "List loaded kernel modules"
37 //usage:#endif
38
39 #include "libbb.h"
40 #include "unicode.h"
41
42 #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
43 enum {
44         TAINT_PROPRIETORY_MODULE = (1 << 0),
45         TAINT_FORCED_MODULE      = (1 << 1),
46         TAINT_UNSAFE_SMP         = (1 << 2),
47 };
48
49 static void check_tainted(void)
50 {
51         int tainted = 0;
52         char *buf = xmalloc_open_read_close("/proc/sys/kernel/tainted", NULL);
53         if (buf) {
54                 tainted = atoi(buf);
55                 if (ENABLE_FEATURE_CLEAN_UP)
56                         free(buf);
57         }
58
59         if (tainted) {
60                 printf("    Tainted: %c%c%c\n",
61                                 tainted & TAINT_PROPRIETORY_MODULE      ? 'P' : 'G',
62                                 tainted & TAINT_FORCED_MODULE           ? 'F' : ' ',
63                                 tainted & TAINT_UNSAFE_SMP              ? 'S' : ' ');
64         } else {
65                 puts("    Not tainted");
66         }
67 }
68 #else
69 static void check_tainted(void) { putchar('\n'); }
70 #endif
71
72 int lsmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
73 int lsmod_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
74 {
75 #if ENABLE_FEATURE_LSMOD_PRETTY_2_6_OUTPUT
76         char *token[4];
77         parser_t *parser = config_open("/proc/modules");
78         init_unicode();
79
80         printf("%-24sSize  Used by", "Module");
81         check_tainted();
82
83         if (ENABLE_FEATURE_2_4_MODULES
84          && get_linux_version_code() < KERNEL_VERSION(2,6,0)
85         ) {
86                 while (config_read(parser, token, 4, 3, "# \t", PARSE_NORMAL)) {
87                         if (token[3] != NULL && token[3][0] == '[') {
88                                 token[3]++;
89                                 token[3][strlen(token[3])-1] = '\0';
90                         } else
91                                 token[3] = (char *) "";
92 # if ENABLE_UNICODE_SUPPORT
93                         {
94                                 uni_stat_t uni_stat;
95                                 char *uni_name = unicode_conv_to_printable(&uni_stat, token[0]);
96                                 unsigned pad_len = (uni_stat.unicode_width > 19) ? 0 : 19 - uni_stat.unicode_width;
97                                 printf("%s%*s %8s %2s %s\n", uni_name, pad_len, "", token[1], token[2], token[3]);
98                                 free(uni_name);
99                         }
100 # else
101                         printf("%-19s %8s %2s %s\n", token[0], token[1], token[2], token[3]);
102 # endif
103                 }
104         } else {
105                 while (config_read(parser, token, 4, 4, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
106                         // N.B. token[3] is either '-' (module is not used by others)
107                         // or comma-separated list ended by comma
108                         // so trimming the trailing char is just what we need!
109                         if (token[3][0])
110                                 token[3][strlen(token[3]) - 1] = '\0';
111 # if ENABLE_UNICODE_SUPPORT
112                         {
113                                 uni_stat_t uni_stat;
114                                 char *uni_name = unicode_conv_to_printable(&uni_stat, token[0]);
115                                 unsigned pad_len = (uni_stat.unicode_width > 19) ? 0 : 19 - uni_stat.unicode_width;
116                                 printf("%s%*s %8s %2s %s\n", uni_name, pad_len, "", token[1], token[2], token[3]);
117                                 free(uni_name);
118                         }
119 # else
120                         printf("%-19s %8s %2s %s\n", token[0], token[1], token[2], token[3]);
121 # endif
122                 }
123         }
124         if (ENABLE_FEATURE_CLEAN_UP)
125                 config_close(parser);
126 #else
127         check_tainted();
128         xprint_and_close_file(xfopen_for_read("/proc/modules"));
129 #endif
130         return EXIT_SUCCESS;
131 }