1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/* -*- linux-c -*-
* Symbols and modules functions for staprun.
*
* Copyright (C) 2006, 2007 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#include "staprun.h"
#include "../sym.h"
static int send_data(void *data, int len)
{
return write(control_channel, data, len);
}
/* Get the sections for a module. Put them in the supplied buffer */
/* in the following order: */
/* [struct _stp_module][struct _stp_symbol sections ...][string data] */
/* Return the total length of all the data. */
#define SECDIR "/sys/module/%s/sections"
static int get_sections(char *name, char *data_start, int datalen)
{
char dir[STP_MODULE_NAME_LEN + sizeof(SECDIR)];
char filename[STP_MODULE_NAME_LEN + 256];
char buf[32], strdata_start[32768];
char *strdata=strdata_start, *data=data_start;
int fd, len, res;
struct _stp_module *mod = (struct _stp_module *)data_start;
struct dirent *d;
DIR *secdir;
struct _stp_symbol *sec;
/* start of data is a struct _stp_module */
data += sizeof(struct _stp_module);
res = snprintf(dir, sizeof(dir), SECDIR, name);
if (res >= (int)sizeof(dir)) {
fprintf(stderr, "ERROR: couldn't fit module \"%s\" into dir buffer.\n", name);
fprintf(stderr, "This should never happen. Please file a bug report.\n");
cleanup_and_exit(0);
}
if ((secdir = opendir(dir)) == NULL)
return 0;
memset(mod, 0, sizeof(struct _stp_module));
strncpy(mod->name, name, STP_MODULE_NAME_LEN);
while ((d = readdir(secdir))) {
char *secname = d->d_name;
res = snprintf(filename, sizeof(filename), "/sys/module/%s/sections/%s", name, secname);
if (res >= (int)sizeof(filename)) {
fprintf(stderr, "ERROR: couldn't fit secname \"%s\" into filename buffer.\n", secname);
fprintf(stderr, "This should never happen. Please file a bug report.\n");
closedir(secdir);
cleanup_and_exit(0);
}
if ((fd = open(filename,O_RDONLY)) >= 0) {
if (read(fd, buf, 32) > 0) {
/* filter out some non-useful stuff */
if (!strncmp(secname,"__",2)
|| !strcmp(secname,".module_sig")
|| !strcmp(secname,".modinfo")
|| !strcmp(secname,".strtab")
|| !strcmp(secname,".symtab") ) {
close(fd);
continue;
}
if (!strncmp(secname, ".gnu.linkonce", 13)
&& strcmp(secname, ".gnu.linkonce.this_module"))
continue;
/* create next section */
sec = (struct _stp_symbol *)data;
if (data - data_start + (int)sizeof(struct _stp_symbol) > datalen)
goto err1;
data += sizeof(struct _stp_symbol);
sec->addr = strtoul(buf,NULL,16);
sec->symbol = (char *)(strdata - strdata_start);
mod->num_sections++;
/* now create string data for the section */
if (strdata - strdata_start + strlen(strdata) >= sizeof(strdata_start))
goto err1;
strcpy(strdata, secname);
strdata += strlen(secname) + 1;
/* These sections are used a lot so keep the values handy */
if (!strcmp(secname, ".data"))
mod->data = sec->addr;
if (!strcmp(secname, ".text"))
mod->text = sec->addr;
if (!strcmp(secname, ".gnu.linkonce.this_module"))
mod->module = sec->addr;
}
close(fd);
}
}
closedir(secdir);
/* consolidate buffers */
len = strdata - strdata_start;
if ((len + data - data_start) > datalen)
goto err0;
strdata = strdata_start;
while (len--)
*data++ = *strdata++;
return data - data_start;
err1:
close(fd);
closedir(secdir);
err0:
err("overflowed buffers.\n");
cleanup_and_exit(0);
return 0; /* not reached */
}
#undef SECDIR
void send_module (char *mname)
{
char data[32768];
int len = get_sections(mname, data, sizeof(data));
if (len)
send_request(STP_MODULE, data, len);
}
int do_module (void *data)
{
struct _stp_module *mod = (struct _stp_module *)data;
if (mod->name[0] == 0) {
struct dirent *d;
DIR *moddir = opendir("/sys/module");
if (moddir) {
while ((d = readdir(moddir)))
send_module(d->d_name);
closedir(moddir);
}
return 1;
}
send_module(mod->name);
return 0;
}
static int compar(const void *p1, const void *p2)
{
struct _stp_symbol *s1 = (struct _stp_symbol *)p1;
struct _stp_symbol *s2 = (struct _stp_symbol *)p2;
if (s1->addr == s2->addr) return 0;
if (s1->addr < s2->addr) return -1;
return 1;
}
#define MAX_SYMBOLS 32768
void do_kernel_symbols(void)
{
FILE *kallsyms;
char *sym_base, *data_base;
char buf[128], *ptr, *name, *data, *dataptr, *datamax, type;
unsigned long addr;
struct _stp_symbol *syms;
int num_syms, i = 0;
sym_base = malloc(MAX_SYMBOLS*sizeof(struct _stp_symbol)+sizeof(long));
data_base = malloc(MAX_SYMBOLS*32);
if (data_base == NULL || sym_base == NULL) {
fprintf(stderr,"Failed to allocate memory for symbols\n");
cleanup_and_exit(0);
}
*(int *)data_base = STP_SYMBOLS;
dataptr = data = data_base + sizeof(long);
datamax = dataptr + MAX_SYMBOLS*32 - sizeof(long);
*(int *)sym_base = STP_SYMBOLS;
syms = (struct _stp_symbol *)(sym_base + sizeof(long));
kallsyms = fopen ("/proc/kallsyms", "r");
if (!kallsyms) {
perror("Fatal error: Unable to open /proc/kallsyms:");
cleanup_and_exit(0);
}
/* put empty string in data */
*dataptr++ = 0;
while (fgets_unlocked(buf, 128, kallsyms) && dataptr < datamax) {
addr = strtoul(buf, &ptr, 16);
while (isspace(*ptr)) ptr++;
type = *ptr++;
if (type == 't' || type == 'T' || type == 'A') {
while (isspace(*ptr)) ptr++;
name = ptr++;
while (!isspace(*ptr)) ptr++;
*ptr++ = 0;
while (*ptr && *ptr != '[') ptr++;
if (*ptr)
continue; /* it was a module */
syms[i].addr = addr;
syms[i].symbol = (char *)(dataptr - data);
while (*name) *dataptr++ = *name++;
*dataptr++ = 0;
i++;
if (dataptr > datamax - 1000)
break;
}
}
num_syms = i;
qsort(syms, num_syms, sizeof(struct _stp_symbol), compar);
/* send header */
*(int *)buf = STP_SYMBOLS;
*(int *)(buf+sizeof(long)) = num_syms;
*(int *)(buf+sizeof(long)+sizeof(int)) = (unsigned)(dataptr - data);
send_data(buf, 2*sizeof(int)+sizeof(long));
/* send syms */
send_data(sym_base, num_syms*sizeof(struct _stp_symbol)+sizeof(long));
/* send data */
send_data(data_base, dataptr-data+sizeof(long));
free(data_base);
free(sym_base);
fclose(kallsyms);
if (dataptr >= datamax) {
fprintf(stderr,"Error: overflowed symbol data area.\n");
cleanup_and_exit(0);
}
}
|
