Mon, 12 Aug 2019 18:30:40 +0300
8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens
1 /*
2 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "memory/allocation.hpp"
26 #include "memory/allocation.inline.hpp"
27 #include "memory/guardedMemory.hpp"
28 #include "runtime/os.hpp"
30 void* GuardedMemory::wrap_copy(const void* ptr, const size_t len, const void* tag) {
31 size_t total_sz = GuardedMemory::get_total_size(len);
32 void* outerp = os::malloc(total_sz, mtInternal);
33 if (outerp != NULL) {
34 GuardedMemory guarded(outerp, len, tag);
35 void* innerp = guarded.get_user_ptr();
36 memcpy(innerp, ptr, len);
37 return innerp;
38 }
39 return NULL; // OOM
40 }
42 bool GuardedMemory::free_copy(void* p) {
43 if (p == NULL) {
44 return true;
45 }
46 GuardedMemory guarded((u_char*)p);
47 bool verify_ok = guarded.verify_guards();
49 /* always attempt to free, pass problem on to any nested memchecker */
50 os::free(guarded.release_for_freeing());
52 return verify_ok;
53 }
55 void GuardedMemory::print_on(outputStream* st) const {
56 if (_base_addr == NULL) {
57 st->print_cr("GuardedMemory(" PTR_FORMAT ") not associated to any memory", p2i(this));
58 return;
59 }
60 st->print_cr("GuardedMemory(" PTR_FORMAT ") base_addr=" PTR_FORMAT
61 " tag=" PTR_FORMAT " user_size=" SIZE_FORMAT " user_data=" PTR_FORMAT,
62 p2i(this), p2i(_base_addr), p2i(get_tag()), get_user_size(), p2i(get_user_ptr()));
64 Guard* guard = get_head_guard();
65 st->print_cr(" Header guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN"));
66 guard = get_tail_guard();
67 st->print_cr(" Trailer guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN"));
69 u_char udata = *get_user_ptr();
70 switch (udata) {
71 case uninitBlockPad:
72 st->print_cr(" User data appears unused");
73 break;
74 case freeBlockPad:
75 st->print_cr(" User data appears to have been freed");
76 break;
77 default:
78 st->print_cr(" User data appears to be in use");
79 break;
80 }
81 }
83 // test code...
85 #ifndef PRODUCT
87 #define GEN_PURPOSE_TAG ((void *) ((uintptr_t)0xf000f000))
89 static void guarded_memory_test_check(void* p, size_t sz, void* tag) {
90 assert(p != NULL, "NULL pointer given to check");
91 u_char* c = (u_char*) p;
92 GuardedMemory guarded(c);
93 assert(guarded.get_tag() == tag, "Tag is not the same as supplied");
94 assert(guarded.get_user_ptr() == c, "User pointer is not the same as supplied");
95 assert(guarded.get_user_size() == sz, "User size is not the same as supplied");
96 assert(guarded.verify_guards(), "Guard broken");
97 }
99 void GuardedMemory::test_guarded_memory() {
100 // Test the basic characteristics...
101 size_t total_sz = GuardedMemory::get_total_size(1);
102 assert(total_sz > 1 && total_sz >= (sizeof(GuardHeader) + 1 + sizeof(Guard)), "Unexpected size");
103 u_char* basep = (u_char*) os::malloc(total_sz, mtInternal);
105 GuardedMemory guarded(basep, 1, GEN_PURPOSE_TAG);
107 assert(*basep == badResourceValue, "Expected guard in the form of badResourceValue");
108 u_char* userp = guarded.get_user_ptr();
109 assert(*userp == uninitBlockPad, "Expected uninitialized data in the form of uninitBlockPad");
110 guarded_memory_test_check(userp, 1, GEN_PURPOSE_TAG);
112 void* freep = guarded.release_for_freeing();
113 assert((u_char*)freep == basep, "Expected the same pointer guard was ");
114 assert(*userp == freeBlockPad, "Expected user data to be free block padded");
115 assert(!guarded.verify_guards(), "Expected failed");
116 os::free(freep);
118 // Test a number of odd sizes...
119 size_t sz = 0;
120 do {
121 void* p = os::malloc(GuardedMemory::get_total_size(sz), mtInternal);
122 void* up = guarded.wrap_with_guards(p, sz, (void*)1);
123 memset(up, 0, sz);
124 guarded_memory_test_check(up, sz, (void*)1);
125 os::free(guarded.release_for_freeing());
126 sz = (sz << 4) + 1;
127 } while (sz < (256 * 1024));
129 // Test buffer overrun into head...
130 basep = (u_char*) os::malloc(GuardedMemory::get_total_size(1), mtInternal);
131 guarded.wrap_with_guards(basep, 1);
132 *basep = 0;
133 assert(!guarded.verify_guards(), "Expected failure");
134 os::free(basep);
136 // Test buffer overrun into tail with a number of odd sizes...
137 sz = 1;
138 do {
139 void* p = os::malloc(GuardedMemory::get_total_size(sz), mtInternal);
140 void* up = guarded.wrap_with_guards(p, sz, (void*)1);
141 memset(up, 0, sz + 1); // Buffer-overwrite (within guard)
142 assert(!guarded.verify_guards(), "Guard was not broken as expected");
143 os::free(guarded.release_for_freeing());
144 sz = (sz << 4) + 1;
145 } while (sz < (256 * 1024));
147 // Test wrap_copy/wrap_free...
148 assert(GuardedMemory::free_copy(NULL), "Expected free NULL to be OK");
150 const char* str = "Check my bounds out";
151 size_t str_sz = strlen(str) + 1;
152 char* str_copy = (char*) GuardedMemory::wrap_copy(str, str_sz);
153 guarded_memory_test_check(str_copy, str_sz, NULL);
154 assert(strcmp(str, str_copy) == 0, "Not identical copy");
155 assert(GuardedMemory::free_copy(str_copy), "Free copy failed to verify");
157 void* no_data = NULL;
158 void* no_data_copy = GuardedMemory::wrap_copy(no_data, 0);
159 assert(GuardedMemory::free_copy(no_data_copy), "Expected valid guards even for no data copy");
160 }
162 #endif // !PRODUCT