scsi: pvscsi: check command descriptor ring buffer size (CVE-2016-4952)
[qemu.git] / util / qemu-error.c
1 /*
2 * Error reporting
3 *
4 * Copyright (C) 2010 Red Hat Inc.
5 *
6 * Authors:
7 * Markus Armbruster <armbru@redhat.com>,
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
11 */
12
13 #include "qemu/osdep.h"
14 #include "monitor/monitor.h"
15 #include "qemu/error-report.h"
16
17 /*
18 * Print to current monitor if we have one, else to stderr.
19 * TODO should return int, so callers can calculate width, but that
20 * requires surgery to monitor_vprintf(). Left for another day.
21 */
22 void error_vprintf(const char *fmt, va_list ap)
23 {
24 if (cur_mon && !monitor_cur_is_qmp()) {
25 monitor_vprintf(cur_mon, fmt, ap);
26 } else {
27 vfprintf(stderr, fmt, ap);
28 }
29 }
30
31 /*
32 * Print to current monitor if we have one, else to stderr.
33 * TODO just like error_vprintf()
34 */
35 void error_printf(const char *fmt, ...)
36 {
37 va_list ap;
38
39 va_start(ap, fmt);
40 error_vprintf(fmt, ap);
41 va_end(ap);
42 }
43
44 void error_printf_unless_qmp(const char *fmt, ...)
45 {
46 va_list ap;
47
48 if (!monitor_cur_is_qmp()) {
49 va_start(ap, fmt);
50 error_vprintf(fmt, ap);
51 va_end(ap);
52 }
53 }
54
55 static Location std_loc = {
56 .kind = LOC_NONE
57 };
58 static Location *cur_loc = &std_loc;
59
60 /*
61 * Push location saved in LOC onto the location stack, return it.
62 * The top of that stack is the current location.
63 * Needs a matching loc_pop().
64 */
65 Location *loc_push_restore(Location *loc)
66 {
67 assert(!loc->prev);
68 loc->prev = cur_loc;
69 cur_loc = loc;
70 return loc;
71 }
72
73 /*
74 * Initialize *LOC to "nowhere", push it onto the location stack.
75 * The top of that stack is the current location.
76 * Needs a matching loc_pop().
77 * Return LOC.
78 */
79 Location *loc_push_none(Location *loc)
80 {
81 loc->kind = LOC_NONE;
82 loc->prev = NULL;
83 return loc_push_restore(loc);
84 }
85
86 /*
87 * Pop the location stack.
88 * LOC must be the current location, i.e. the top of the stack.
89 */
90 Location *loc_pop(Location *loc)
91 {
92 assert(cur_loc == loc && loc->prev);
93 cur_loc = loc->prev;
94 loc->prev = NULL;
95 return loc;
96 }
97
98 /*
99 * Save the current location in LOC, return LOC.
100 */
101 Location *loc_save(Location *loc)
102 {
103 *loc = *cur_loc;
104 loc->prev = NULL;
105 return loc;
106 }
107
108 /*
109 * Change the current location to the one saved in LOC.
110 */
111 void loc_restore(Location *loc)
112 {
113 Location *prev = cur_loc->prev;
114 assert(!loc->prev);
115 *cur_loc = *loc;
116 cur_loc->prev = prev;
117 }
118
119 /*
120 * Change the current location to "nowhere in particular".
121 */
122 void loc_set_none(void)
123 {
124 cur_loc->kind = LOC_NONE;
125 }
126
127 /*
128 * Change the current location to argument ARGV[IDX..IDX+CNT-1].
129 */
130 void loc_set_cmdline(char **argv, int idx, int cnt)
131 {
132 cur_loc->kind = LOC_CMDLINE;
133 cur_loc->num = cnt;
134 cur_loc->ptr = argv + idx;
135 }
136
137 /*
138 * Change the current location to file FNAME, line LNO.
139 */
140 void loc_set_file(const char *fname, int lno)
141 {
142 assert (fname || cur_loc->kind == LOC_FILE);
143 cur_loc->kind = LOC_FILE;
144 cur_loc->num = lno;
145 if (fname) {
146 cur_loc->ptr = fname;
147 }
148 }
149
150 static const char *progname;
151
152 /*
153 * Set the program name for error_print_loc().
154 */
155 void error_set_progname(const char *argv0)
156 {
157 const char *p = strrchr(argv0, '/');
158 progname = p ? p + 1 : argv0;
159 }
160
161 const char *error_get_progname(void)
162 {
163 return progname;
164 }
165
166 /*
167 * Print current location to current monitor if we have one, else to stderr.
168 */
169 static void error_print_loc(void)
170 {
171 const char *sep = "";
172 int i;
173 const char *const *argp;
174
175 if (!cur_mon && progname) {
176 fprintf(stderr, "%s:", progname);
177 sep = " ";
178 }
179 switch (cur_loc->kind) {
180 case LOC_CMDLINE:
181 argp = cur_loc->ptr;
182 for (i = 0; i < cur_loc->num; i++) {
183 error_printf("%s%s", sep, argp[i]);
184 sep = " ";
185 }
186 error_printf(": ");
187 break;
188 case LOC_FILE:
189 error_printf("%s:", (const char *)cur_loc->ptr);
190 if (cur_loc->num) {
191 error_printf("%d:", cur_loc->num);
192 }
193 error_printf(" ");
194 break;
195 default:
196 error_printf("%s", sep);
197 }
198 }
199
200 bool enable_timestamp_msg;
201 /*
202 * Print an error message to current monitor if we have one, else to stderr.
203 * Format arguments like vsprintf(). The resulting message should be
204 * a single phrase, with no newline or trailing punctuation.
205 * Prepend the current location and append a newline.
206 * It's wrong to call this in a QMP monitor. Use error_setg() there.
207 */
208 void error_vreport(const char *fmt, va_list ap)
209 {
210 GTimeVal tv;
211 gchar *timestr;
212
213 if (enable_timestamp_msg && !cur_mon) {
214 g_get_current_time(&tv);
215 timestr = g_time_val_to_iso8601(&tv);
216 error_printf("%s ", timestr);
217 g_free(timestr);
218 }
219
220 error_print_loc();
221 error_vprintf(fmt, ap);
222 error_printf("\n");
223 }
224
225 /*
226 * Print an error message to current monitor if we have one, else to stderr.
227 * Format arguments like sprintf(). The resulting message should be a
228 * single phrase, with no newline or trailing punctuation.
229 * Prepend the current location and append a newline.
230 * It's wrong to call this in a QMP monitor. Use error_setg() there.
231 */
232 void error_report(const char *fmt, ...)
233 {
234 va_list ap;
235
236 va_start(ap, fmt);
237 error_vreport(fmt, ap);
238 va_end(ap);
239 }