scsi: pvscsi: check command descriptor ring buffer size (CVE-2016-4952)
[qemu.git] / util / qemu-progress.c
1 /*
2 * QEMU progress printing utility functions
3 *
4 * Copyright (C) 2011 Jes Sorensen <Jes.Sorensen@redhat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "qemu-common.h"
27
28 struct progress_state {
29 float current;
30 float last_print;
31 float min_skip;
32 void (*print)(void);
33 void (*end)(void);
34 };
35
36 static struct progress_state state;
37 static volatile sig_atomic_t print_pending;
38
39 /*
40 * Simple progress print function.
41 * @percent relative percent of current operation
42 * @max percent of total operation
43 */
44 static void progress_simple_print(void)
45 {
46 printf(" (%3.2f/100%%)\r", state.current);
47 fflush(stdout);
48 }
49
50 static void progress_simple_end(void)
51 {
52 printf("\n");
53 }
54
55 static void progress_simple_init(void)
56 {
57 state.print = progress_simple_print;
58 state.end = progress_simple_end;
59 }
60
61 #ifdef CONFIG_POSIX
62 static void sigusr_print(int signal)
63 {
64 print_pending = 1;
65 }
66 #endif
67
68 static void progress_dummy_print(void)
69 {
70 if (print_pending) {
71 fprintf(stderr, " (%3.2f/100%%)\n", state.current);
72 print_pending = 0;
73 }
74 }
75
76 static void progress_dummy_end(void)
77 {
78 }
79
80 static void progress_dummy_init(void)
81 {
82 #ifdef CONFIG_POSIX
83 struct sigaction action;
84 sigset_t set;
85
86 memset(&action, 0, sizeof(action));
87 sigfillset(&action.sa_mask);
88 action.sa_handler = sigusr_print;
89 action.sa_flags = 0;
90 sigaction(SIGUSR1, &action, NULL);
91
92 /*
93 * SIGUSR1 is SIG_IPI and gets blocked in qemu_init_main_loop(). In the
94 * tools that use the progress report SIGUSR1 isn't used in this meaning
95 * and instead should print the progress, so reenable it.
96 */
97 sigemptyset(&set);
98 sigaddset(&set, SIGUSR1);
99 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
100 #endif
101
102 state.print = progress_dummy_print;
103 state.end = progress_dummy_end;
104 }
105
106 /*
107 * Initialize progress reporting.
108 * If @enabled is false, actual reporting is suppressed. The user can
109 * still trigger a report by sending a SIGUSR1.
110 * Reports are also suppressed unless we've had at least @min_skip
111 * percent progress since the last report.
112 */
113 void qemu_progress_init(int enabled, float min_skip)
114 {
115 state.min_skip = min_skip;
116 if (enabled) {
117 progress_simple_init();
118 } else {
119 progress_dummy_init();
120 }
121 }
122
123 void qemu_progress_end(void)
124 {
125 state.end();
126 }
127
128 /*
129 * Report progress.
130 * @delta is how much progress we made.
131 * If @max is zero, @delta is an absolut value of the total job done.
132 * Else, @delta is a progress delta since the last call, as a fraction
133 * of @max. I.e. the delta is @delta * @max / 100. This allows
134 * relative accounting of functions which may be a different fraction of
135 * the full job, depending on the context they are called in. I.e.
136 * a function might be considered 40% of the full job if used from
137 * bdrv_img_create() but only 20% if called from img_convert().
138 */
139 void qemu_progress_print(float delta, int max)
140 {
141 float current;
142
143 if (max == 0) {
144 current = delta;
145 } else {
146 current = state.current + delta / 100 * max;
147 }
148 if (current > 100) {
149 current = 100;
150 }
151 state.current = current;
152
153 if (current > (state.last_print + state.min_skip) ||
154 current < (state.last_print - state.min_skip) ||
155 current == 100 || current == 0) {
156 state.last_print = state.current;
157 state.print();
158 }
159 }