1 /*-
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/param.h>
31 #include <dlfcn.h>
32 #include <stdbool.h>
33 #include <stdio.h>
34 #include <string.h>
35 #include <sysdecode.h>
36 #include "rtld_utrace.h"
37
38 #ifdef __LP64__
39 struct utrace_rtld32 {
40 char sig[4];
41 int event;
42 uint32_t handle;
43 uint32_t mapbase;
44 uint32_t mapsize;
45 int refcnt;
46 char name[MAXPATHLEN];
47 };
48 #endif
49
50 static int
print_utrace_rtld(FILE * fp,void * p)51 print_utrace_rtld(FILE *fp, void *p)
52 {
53 struct utrace_rtld *ut = p;
54 void *parent;
55 int mode;
56
57 switch (ut->event) {
58 case UTRACE_DLOPEN_START:
59 mode = ut->refcnt;
60 fprintf(fp, "dlopen(%s, ", ut->name);
61 switch (mode & RTLD_MODEMASK) {
62 case RTLD_NOW:
63 fprintf(fp, "RTLD_NOW");
64 break;
65 case RTLD_LAZY:
66 fprintf(fp, "RTLD_LAZY");
67 break;
68 default:
69 fprintf(fp, "%#x", mode & RTLD_MODEMASK);
70 }
71 if (mode & RTLD_GLOBAL)
72 fprintf(fp, " | RTLD_GLOBAL");
73 if (mode & RTLD_TRACE)
74 fprintf(fp, " | RTLD_TRACE");
75 if (mode & ~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE))
76 fprintf(fp, " | %#x", mode &
77 ~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE));
78 fprintf(fp, ")");
79 break;
80 case UTRACE_DLOPEN_STOP:
81 fprintf(fp, "%p = dlopen(%s) ref %d", ut->handle, ut->name,
82 ut->refcnt);
83 break;
84 case UTRACE_DLCLOSE_START:
85 fprintf(fp, "dlclose(%p) (%s, %d)", ut->handle, ut->name,
86 ut->refcnt);
87 break;
88 case UTRACE_DLCLOSE_STOP:
89 fprintf(fp, "dlclose(%p) finished", ut->handle);
90 break;
91 case UTRACE_LOAD_OBJECT:
92 fprintf(fp, "RTLD: loaded %p @ %p - %p (%s)", ut->handle,
93 ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
94 ut->name);
95 break;
96 case UTRACE_UNLOAD_OBJECT:
97 fprintf(fp, "RTLD: unloaded %p @ %p - %p (%s)", ut->handle,
98 ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
99 ut->name);
100 break;
101 case UTRACE_ADD_RUNDEP:
102 parent = ut->mapbase;
103 fprintf(fp, "RTLD: %p now depends on %p (%s, %d)", parent,
104 ut->handle, ut->name, ut->refcnt);
105 break;
106 case UTRACE_PRELOAD_FINISHED:
107 fprintf(fp, "RTLD: LD_PRELOAD finished");
108 break;
109 case UTRACE_INIT_CALL:
110 fprintf(fp, "RTLD: init %p for %p (%s)", ut->mapbase, ut->handle,
111 ut->name);
112 break;
113 case UTRACE_FINI_CALL:
114 fprintf(fp, "RTLD: fini %p for %p (%s)", ut->mapbase, ut->handle,
115 ut->name);
116 break;
117 case UTRACE_DLSYM_START:
118 fprintf(fp, "RTLD: dlsym(%p, %s)", ut->handle, ut->name);
119 break;
120 case UTRACE_DLSYM_STOP:
121 fprintf(fp, "RTLD: %p = dlsym(%p, %s)", ut->mapbase, ut->handle,
122 ut->name);
123 break;
124 case UTRACE_RTLD_ERROR:
125 fprintf(fp, "RTLD: error: %s\n", ut->name);
126 break;
127
128 default:
129 return (0);
130 }
131 return (1);
132 }
133
134 struct utrace_malloc {
135 void *p;
136 size_t s;
137 void *r;
138 };
139
140 #ifdef __LP64__
141 struct utrace_malloc32 {
142 uint32_t p;
143 uint32_t s;
144 uint32_t r;
145 };
146 #endif
147
148 static void
print_utrace_malloc(FILE * fp,void * p)149 print_utrace_malloc(FILE *fp, void *p)
150 {
151 struct utrace_malloc *ut = p;
152
153 if (ut->p == (void *)(intptr_t)(-1))
154 fprintf(fp, "malloc_init()");
155 else if (ut->s == 0)
156 fprintf(fp, "free(%p)", ut->p);
157 else if (ut->p == NULL)
158 fprintf(fp, "%p = malloc(%zu)", ut->r, ut->s);
159 else
160 fprintf(fp, "%p = realloc(%p, %zu)", ut->r, ut->p, ut->s);
161 }
162
163 int
sysdecode_utrace(FILE * fp,void * p,size_t len)164 sysdecode_utrace(FILE *fp, void *p, size_t len)
165 {
166 #ifdef __LP64__
167 struct utrace_rtld ur;
168 struct utrace_rtld32 *pr;
169 struct utrace_malloc um;
170 struct utrace_malloc32 *pm;
171 #endif
172 static const char rtld_utrace_sig[RTLD_UTRACE_SIG_SZ] = RTLD_UTRACE_SIG;
173
174 if (len == sizeof(struct utrace_rtld) && bcmp(p, rtld_utrace_sig,
175 sizeof(rtld_utrace_sig)) == 0)
176 return (print_utrace_rtld(fp, p));
177
178 if (len == sizeof(struct utrace_malloc)) {
179 print_utrace_malloc(fp, p);
180 return (1);
181 }
182
183 #ifdef __LP64__
184 if (len == sizeof(struct utrace_rtld32) && bcmp(p, rtld_utrace_sig,
185 sizeof(rtld_utrace_sig)) == 0) {
186 pr = p;
187 memset(&ur, 0, sizeof(ur));
188 memcpy(ur.sig, pr->sig, sizeof(ur.sig));
189 ur.event = pr->event;
190 ur.handle = (void *)(uintptr_t)pr->handle;
191 ur.mapbase = (void *)(uintptr_t)pr->mapbase;
192 ur.mapsize = pr->mapsize;
193 ur.refcnt = pr->refcnt;
194 memcpy(ur.name, pr->name, sizeof(ur.name));
195 return (print_utrace_rtld(fp, &ur));
196 }
197
198 if (len == sizeof(struct utrace_malloc32)) {
199 pm = p;
200 memset(&um, 0, sizeof(um));
201 um.p = pm->p == (uint32_t)-1 ? (void *)(intptr_t)-1 :
202 (void *)(uintptr_t)pm->p;
203 um.s = pm->s;
204 um.r = (void *)(uintptr_t)pm->r;
205 print_utrace_malloc(fp, &um);
206 return (1);
207 }
208 #endif
209
210 return (0);
211 }
212