1 /*
2 * Copyright (c) 1999, 2019, 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 *
123 // even in its subfields (as defined by the CPU immediate fields,
124 // if the CPU splits constants across multiple instructions).
125 return (char*) -1;
126 }
127
128 //
129 // Validate a ucontext retrieved from walking a uc_link of a ucontext.
130 // There are issues with libthread giving out uc_links for different threads
131 // on the same uc_link chain and bad or circular links.
132 //
133 bool os::Solaris::valid_ucontext(Thread* thread, const ucontext_t* valid, const ucontext_t* suspect) {
134 if (valid >= suspect ||
135 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
136 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp ||
137 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) {
138 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
139 return false;
140 }
141
142 if (thread->is_Java_thread()) {
143 if (!valid_stack_address(thread, (address)suspect)) {
144 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
145 return false;
146 }
147 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) {
148 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
149 return false;
150 }
151 }
152 return true;
153 }
154
155 // We will only follow one level of uc_link since there are libthread
156 // issues with ucontext linking and it is better to be safe and just
157 // let caller retry later.
158 const ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
159 const ucontext_t *uc) {
160
161 const ucontext_t *retuc = NULL;
162
163 if (uc != NULL) {
164 if (uc->uc_link == NULL) {
165 // cannot validate without uc_link so accept current ucontext
166 retuc = uc;
167 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
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1 /*
2 * Copyright (c) 1999, 2020, 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 *
123 // even in its subfields (as defined by the CPU immediate fields,
124 // if the CPU splits constants across multiple instructions).
125 return (char*) -1;
126 }
127
128 //
129 // Validate a ucontext retrieved from walking a uc_link of a ucontext.
130 // There are issues with libthread giving out uc_links for different threads
131 // on the same uc_link chain and bad or circular links.
132 //
133 bool os::Solaris::valid_ucontext(Thread* thread, const ucontext_t* valid, const ucontext_t* suspect) {
134 if (valid >= suspect ||
135 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
136 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp ||
137 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) {
138 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
139 return false;
140 }
141
142 if (thread->is_Java_thread()) {
143 if (!thread->is_in_full_stack((address)suspect)) {
144 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
145 return false;
146 }
147 if (!thread->is_in_full_stack((address) suspect->uc_mcontext.gregs[REG_SP])) {
148 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
149 return false;
150 }
151 }
152 return true;
153 }
154
155 // We will only follow one level of uc_link since there are libthread
156 // issues with ucontext linking and it is better to be safe and just
157 // let caller retry later.
158 const ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
159 const ucontext_t *uc) {
160
161 const ucontext_t *retuc = NULL;
162
163 if (uc != NULL) {
164 if (uc->uc_link == NULL) {
165 // cannot validate without uc_link so accept current ucontext
166 retuc = uc;
167 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
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